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 void dasd_eckd_clear_conf_data(struct dasd_device *device)
1036 {
1037         struct dasd_eckd_private *private;
1038         int i;
1039
1040         private = (struct dasd_eckd_private *) device->private;
1041         private->conf_data = NULL;
1042         private->conf_len = 0;
1043         for (i = 0; i < 8; i++) {
1044                 kfree(private->path_conf_data[i]);
1045                 private->path_conf_data[i] = NULL;
1046         }
1047 }
1048
1049
1050 static int dasd_eckd_read_conf(struct dasd_device *device)
1051 {
1052         void *conf_data;
1053         int conf_len, conf_data_saved;
1054         int rc, path_err, pos;
1055         __u8 lpm, opm;
1056         struct dasd_eckd_private *private, path_private;
1057         struct dasd_path *path_data;
1058         struct dasd_uid *uid;
1059         char print_path_uid[60], print_device_uid[60];
1060
1061         private = (struct dasd_eckd_private *) device->private;
1062         path_data = &device->path_data;
1063         opm = ccw_device_get_path_mask(device->cdev);
1064         conf_data_saved = 0;
1065         path_err = 0;
1066         /* get configuration data per operational path */
1067         for (lpm = 0x80; lpm; lpm>>= 1) {
1068                 if (!(lpm & opm))
1069                         continue;
1070                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1071                                              &conf_len, lpm);
1072                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1073                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1074                                         "Read configuration data returned "
1075                                         "error %d", rc);
1076                         return rc;
1077                 }
1078                 if (conf_data == NULL) {
1079                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1080                                         "No configuration data "
1081                                         "retrieved");
1082                         /* no further analysis possible */
1083                         path_data->opm |= lpm;
1084                         continue;       /* no error */
1085                 }
1086                 /* save first valid configuration data */
1087                 if (!conf_data_saved) {
1088                         /* initially clear previously stored conf_data */
1089                         dasd_eckd_clear_conf_data(device);
1090                         private->conf_data = conf_data;
1091                         private->conf_len = conf_len;
1092                         if (dasd_eckd_identify_conf_parts(private)) {
1093                                 private->conf_data = NULL;
1094                                 private->conf_len = 0;
1095                                 kfree(conf_data);
1096                                 continue;
1097                         }
1098                         pos = pathmask_to_pos(lpm);
1099                         /* store per path conf_data */
1100                         private->path_conf_data[pos] =
1101                                 (struct dasd_conf_data *) conf_data;
1102                         /*
1103                          * build device UID that other path data
1104                          * can be compared to it
1105                          */
1106                         dasd_eckd_generate_uid(device);
1107                         conf_data_saved++;
1108                 } else {
1109                         path_private.conf_data = conf_data;
1110                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1111                         if (dasd_eckd_identify_conf_parts(
1112                                     &path_private)) {
1113                                 path_private.conf_data = NULL;
1114                                 path_private.conf_len = 0;
1115                                 kfree(conf_data);
1116                                 continue;
1117                         }
1118                         if (dasd_eckd_compare_path_uid(
1119                                     device, &path_private)) {
1120                                 uid = &path_private.uid;
1121                                 if (strlen(uid->vduit) > 0)
1122                                         snprintf(print_path_uid,
1123                                                  sizeof(print_path_uid),
1124                                                  "%s.%s.%04x.%02x.%s",
1125                                                  uid->vendor, uid->serial,
1126                                                  uid->ssid, uid->real_unit_addr,
1127                                                  uid->vduit);
1128                                 else
1129                                         snprintf(print_path_uid,
1130                                                  sizeof(print_path_uid),
1131                                                  "%s.%s.%04x.%02x",
1132                                                  uid->vendor, uid->serial,
1133                                                  uid->ssid,
1134                                                  uid->real_unit_addr);
1135                                 uid = &private->uid;
1136                                 if (strlen(uid->vduit) > 0)
1137                                         snprintf(print_device_uid,
1138                                                  sizeof(print_device_uid),
1139                                                  "%s.%s.%04x.%02x.%s",
1140                                                  uid->vendor, uid->serial,
1141                                                  uid->ssid, uid->real_unit_addr,
1142                                                  uid->vduit);
1143                                 else
1144                                         snprintf(print_device_uid,
1145                                                  sizeof(print_device_uid),
1146                                                  "%s.%s.%04x.%02x",
1147                                                  uid->vendor, uid->serial,
1148                                                  uid->ssid,
1149                                                  uid->real_unit_addr);
1150                                 dev_err(&device->cdev->dev,
1151                                         "Not all channel paths lead to "
1152                                         "the same device, path %02X leads to "
1153                                         "device %s instead of %s\n", lpm,
1154                                         print_path_uid, print_device_uid);
1155                                 path_err = -EINVAL;
1156                                 path_data->cablepm |= lpm;
1157                                 continue;
1158                         }
1159                         pos = pathmask_to_pos(lpm);
1160                         /* store per path conf_data */
1161                         private->path_conf_data[pos] =
1162                                 (struct dasd_conf_data *) conf_data;
1163                         path_private.conf_data = NULL;
1164                         path_private.conf_len = 0;
1165                 }
1166                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1167                 case 0x02:
1168                         path_data->npm |= lpm;
1169                         break;
1170                 case 0x03:
1171                         path_data->ppm |= lpm;
1172                         break;
1173                 }
1174                 path_data->opm |= lpm;
1175                 /*
1176                  * if the path is used
1177                  * it should not be in one of the negative lists
1178                  */
1179                 path_data->cablepm &= ~lpm;
1180                 path_data->hpfpm &= ~lpm;
1181                 path_data->cuirpm &= ~lpm;
1182         }
1183
1184         return path_err;
1185 }
1186
1187 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1188 {
1189         struct dasd_eckd_private *private;
1190         int mdc;
1191         u32 fcx_max_data;
1192
1193         private = (struct dasd_eckd_private *) device->private;
1194         if (private->fcx_max_data) {
1195                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1196                 if ((mdc < 0)) {
1197                         dev_warn(&device->cdev->dev,
1198                                  "Detecting the maximum data size for zHPF "
1199                                  "requests failed (rc=%d) for a new path %x\n",
1200                                  mdc, lpm);
1201                         return mdc;
1202                 }
1203                 fcx_max_data = mdc * FCX_MAX_DATA_FACTOR;
1204                 if (fcx_max_data < private->fcx_max_data) {
1205                         dev_warn(&device->cdev->dev,
1206                                  "The maximum data size for zHPF requests %u "
1207                                  "on a new path %x is below the active maximum "
1208                                  "%u\n", fcx_max_data, lpm,
1209                                  private->fcx_max_data);
1210                         return -EACCES;
1211                 }
1212         }
1213         return 0;
1214 }
1215
1216 static int rebuild_device_uid(struct dasd_device *device,
1217                               struct path_verification_work_data *data)
1218 {
1219         struct dasd_eckd_private *private;
1220         struct dasd_path *path_data;
1221         __u8 lpm, opm;
1222         int rc;
1223
1224         rc = -ENODEV;
1225         private = (struct dasd_eckd_private *) device->private;
1226         path_data = &device->path_data;
1227         opm = device->path_data.opm;
1228
1229         for (lpm = 0x80; lpm; lpm >>= 1) {
1230                 if (!(lpm & opm))
1231                         continue;
1232                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1233                 memset(&data->cqr, 0, sizeof(data->cqr));
1234                 data->cqr.cpaddr = &data->ccw;
1235                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1236                                                      data->rcd_buffer,
1237                                                      lpm);
1238
1239                 if (rc) {
1240                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1241                                 continue;
1242                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1243                                         "Read configuration data "
1244                                         "returned error %d", rc);
1245                         break;
1246                 }
1247                 memcpy(private->conf_data, data->rcd_buffer,
1248                        DASD_ECKD_RCD_DATA_SIZE);
1249                 if (dasd_eckd_identify_conf_parts(private)) {
1250                         rc = -ENODEV;
1251                 } else /* first valid path is enough */
1252                         break;
1253         }
1254
1255         if (!rc)
1256                 rc = dasd_eckd_generate_uid(device);
1257
1258         return rc;
1259 }
1260
1261 static void do_path_verification_work(struct work_struct *work)
1262 {
1263         struct path_verification_work_data *data;
1264         struct dasd_device *device;
1265         struct dasd_eckd_private path_private;
1266         struct dasd_uid *uid;
1267         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1268         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1269         unsigned long flags;
1270         char print_uid[60];
1271         int rc;
1272
1273         data = container_of(work, struct path_verification_work_data, worker);
1274         device = data->device;
1275
1276         /* delay path verification until device was resumed */
1277         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1278                 schedule_work(work);
1279                 return;
1280         }
1281         /* check if path verification already running and delay if so */
1282         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1283                 schedule_work(work);
1284                 return;
1285         }
1286         opm = 0;
1287         npm = 0;
1288         ppm = 0;
1289         epm = 0;
1290         hpfpm = 0;
1291         cablepm = 0;
1292
1293         for (lpm = 0x80; lpm; lpm >>= 1) {
1294                 if (!(lpm & data->tbvpm))
1295                         continue;
1296                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1297                 memset(&data->cqr, 0, sizeof(data->cqr));
1298                 data->cqr.cpaddr = &data->ccw;
1299                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1300                                                      data->rcd_buffer,
1301                                                      lpm);
1302                 if (!rc) {
1303                         switch (dasd_eckd_path_access(data->rcd_buffer,
1304                                                       DASD_ECKD_RCD_DATA_SIZE)
1305                                 ) {
1306                         case 0x02:
1307                                 npm |= lpm;
1308                                 break;
1309                         case 0x03:
1310                                 ppm |= lpm;
1311                                 break;
1312                         }
1313                         opm |= lpm;
1314                 } else if (rc == -EOPNOTSUPP) {
1315                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1316                                         "path verification: No configuration "
1317                                         "data retrieved");
1318                         opm |= lpm;
1319                 } else if (rc == -EAGAIN) {
1320                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1321                                         "path verification: device is stopped,"
1322                                         " try again later");
1323                         epm |= lpm;
1324                 } else {
1325                         dev_warn(&device->cdev->dev,
1326                                  "Reading device feature codes failed "
1327                                  "(rc=%d) for new path %x\n", rc, lpm);
1328                         continue;
1329                 }
1330                 if (verify_fcx_max_data(device, lpm)) {
1331                         opm &= ~lpm;
1332                         npm &= ~lpm;
1333                         ppm &= ~lpm;
1334                         hpfpm |= lpm;
1335                         continue;
1336                 }
1337
1338                 /*
1339                  * save conf_data for comparison after
1340                  * rebuild_device_uid may have changed
1341                  * the original data
1342                  */
1343                 memcpy(&path_rcd_buf, data->rcd_buffer,
1344                        DASD_ECKD_RCD_DATA_SIZE);
1345                 path_private.conf_data = (void *) &path_rcd_buf;
1346                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1347                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1348                         path_private.conf_data = NULL;
1349                         path_private.conf_len = 0;
1350                         continue;
1351                 }
1352
1353                 /*
1354                  * compare path UID with device UID only if at least
1355                  * one valid path is left
1356                  * in other case the device UID may have changed and
1357                  * the first working path UID will be used as device UID
1358                  */
1359                 if (device->path_data.opm &&
1360                     dasd_eckd_compare_path_uid(device, &path_private)) {
1361                         /*
1362                          * the comparison was not successful
1363                          * rebuild the device UID with at least one
1364                          * known path in case a z/VM hyperswap command
1365                          * has changed the device
1366                          *
1367                          * after this compare again
1368                          *
1369                          * if either the rebuild or the recompare fails
1370                          * the path can not be used
1371                          */
1372                         if (rebuild_device_uid(device, data) ||
1373                             dasd_eckd_compare_path_uid(
1374                                     device, &path_private)) {
1375                                 uid = &path_private.uid;
1376                                 if (strlen(uid->vduit) > 0)
1377                                         snprintf(print_uid, sizeof(print_uid),
1378                                                  "%s.%s.%04x.%02x.%s",
1379                                                  uid->vendor, uid->serial,
1380                                                  uid->ssid, uid->real_unit_addr,
1381                                                  uid->vduit);
1382                                 else
1383                                         snprintf(print_uid, sizeof(print_uid),
1384                                                  "%s.%s.%04x.%02x",
1385                                                  uid->vendor, uid->serial,
1386                                                  uid->ssid,
1387                                                  uid->real_unit_addr);
1388                                 dev_err(&device->cdev->dev,
1389                                         "The newly added channel path %02X "
1390                                         "will not be used because it leads "
1391                                         "to a different device %s\n",
1392                                         lpm, print_uid);
1393                                 opm &= ~lpm;
1394                                 npm &= ~lpm;
1395                                 ppm &= ~lpm;
1396                                 cablepm |= lpm;
1397                                 continue;
1398                         }
1399                 }
1400
1401                 /*
1402                  * There is a small chance that a path is lost again between
1403                  * above path verification and the following modification of
1404                  * the device opm mask. We could avoid that race here by using
1405                  * yet another path mask, but we rather deal with this unlikely
1406                  * situation in dasd_start_IO.
1407                  */
1408                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1409                 if (!device->path_data.opm && opm) {
1410                         device->path_data.opm = opm;
1411                         device->path_data.cablepm &= ~opm;
1412                         device->path_data.cuirpm &= ~opm;
1413                         device->path_data.hpfpm &= ~opm;
1414                         dasd_generic_path_operational(device);
1415                 } else {
1416                         device->path_data.opm |= opm;
1417                         device->path_data.cablepm &= ~opm;
1418                         device->path_data.cuirpm &= ~opm;
1419                         device->path_data.hpfpm &= ~opm;
1420                 }
1421                 device->path_data.npm |= npm;
1422                 device->path_data.ppm |= ppm;
1423                 device->path_data.tbvpm |= epm;
1424                 device->path_data.cablepm |= cablepm;
1425                 device->path_data.hpfpm |= hpfpm;
1426                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1427         }
1428         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1429         dasd_put_device(device);
1430         if (data->isglobal)
1431                 mutex_unlock(&dasd_path_verification_mutex);
1432         else
1433                 kfree(data);
1434 }
1435
1436 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1437 {
1438         struct path_verification_work_data *data;
1439
1440         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1441         if (!data) {
1442                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1443                         data = path_verification_worker;
1444                         data->isglobal = 1;
1445                 } else
1446                         return -ENOMEM;
1447         } else {
1448                 memset(data, 0, sizeof(*data));
1449                 data->isglobal = 0;
1450         }
1451         INIT_WORK(&data->worker, do_path_verification_work);
1452         dasd_get_device(device);
1453         data->device = device;
1454         data->tbvpm = lpm;
1455         schedule_work(&data->worker);
1456         return 0;
1457 }
1458
1459 static int dasd_eckd_read_features(struct dasd_device *device)
1460 {
1461         struct dasd_psf_prssd_data *prssdp;
1462         struct dasd_rssd_features *features;
1463         struct dasd_ccw_req *cqr;
1464         struct ccw1 *ccw;
1465         int rc;
1466         struct dasd_eckd_private *private;
1467
1468         private = (struct dasd_eckd_private *) device->private;
1469         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1470         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1471                                    (sizeof(struct dasd_psf_prssd_data) +
1472                                     sizeof(struct dasd_rssd_features)),
1473                                    device);
1474         if (IS_ERR(cqr)) {
1475                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1476                                 "allocate initialization request");
1477                 return PTR_ERR(cqr);
1478         }
1479         cqr->startdev = device;
1480         cqr->memdev = device;
1481         cqr->block = NULL;
1482         cqr->retries = 256;
1483         cqr->expires = 10 * HZ;
1484
1485         /* Prepare for Read Subsystem Data */
1486         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1487         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1488         prssdp->order = PSF_ORDER_PRSSD;
1489         prssdp->suborder = 0x41;        /* Read Feature Codes */
1490         /* all other bytes of prssdp must be zero */
1491
1492         ccw = cqr->cpaddr;
1493         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1494         ccw->count = sizeof(struct dasd_psf_prssd_data);
1495         ccw->flags |= CCW_FLAG_CC;
1496         ccw->cda = (__u32)(addr_t) prssdp;
1497
1498         /* Read Subsystem Data - feature codes */
1499         features = (struct dasd_rssd_features *) (prssdp + 1);
1500         memset(features, 0, sizeof(struct dasd_rssd_features));
1501
1502         ccw++;
1503         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1504         ccw->count = sizeof(struct dasd_rssd_features);
1505         ccw->cda = (__u32)(addr_t) features;
1506
1507         cqr->buildclk = get_tod_clock();
1508         cqr->status = DASD_CQR_FILLED;
1509         rc = dasd_sleep_on(cqr);
1510         if (rc == 0) {
1511                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1512                 features = (struct dasd_rssd_features *) (prssdp + 1);
1513                 memcpy(&private->features, features,
1514                        sizeof(struct dasd_rssd_features));
1515         } else
1516                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1517                          " failed with rc=%d\n", rc);
1518         dasd_sfree_request(cqr, cqr->memdev);
1519         return rc;
1520 }
1521
1522
1523 /*
1524  * Build CP for Perform Subsystem Function - SSC.
1525  */
1526 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1527                                                     int enable_pav)
1528 {
1529         struct dasd_ccw_req *cqr;
1530         struct dasd_psf_ssc_data *psf_ssc_data;
1531         struct ccw1 *ccw;
1532
1533         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1534                                   sizeof(struct dasd_psf_ssc_data),
1535                                   device);
1536
1537         if (IS_ERR(cqr)) {
1538                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1539                            "Could not allocate PSF-SSC request");
1540                 return cqr;
1541         }
1542         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1543         psf_ssc_data->order = PSF_ORDER_SSC;
1544         psf_ssc_data->suborder = 0xc0;
1545         if (enable_pav) {
1546                 psf_ssc_data->suborder |= 0x08;
1547                 psf_ssc_data->reserved[0] = 0x88;
1548         }
1549         ccw = cqr->cpaddr;
1550         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1551         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1552         ccw->count = 66;
1553
1554         cqr->startdev = device;
1555         cqr->memdev = device;
1556         cqr->block = NULL;
1557         cqr->retries = 256;
1558         cqr->expires = 10*HZ;
1559         cqr->buildclk = get_tod_clock();
1560         cqr->status = DASD_CQR_FILLED;
1561         return cqr;
1562 }
1563
1564 /*
1565  * Perform Subsystem Function.
1566  * It is necessary to trigger CIO for channel revalidation since this
1567  * call might change behaviour of DASD devices.
1568  */
1569 static int
1570 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1571                   unsigned long flags)
1572 {
1573         struct dasd_ccw_req *cqr;
1574         int rc;
1575
1576         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1577         if (IS_ERR(cqr))
1578                 return PTR_ERR(cqr);
1579
1580         /*
1581          * set flags e.g. turn on failfast, to prevent blocking
1582          * the calling function should handle failed requests
1583          */
1584         cqr->flags |= flags;
1585
1586         rc = dasd_sleep_on(cqr);
1587         if (!rc)
1588                 /* trigger CIO to reprobe devices */
1589                 css_schedule_reprobe();
1590         else if (cqr->intrc == -EAGAIN)
1591                 rc = -EAGAIN;
1592
1593         dasd_sfree_request(cqr, cqr->memdev);
1594         return rc;
1595 }
1596
1597 /*
1598  * Valide storage server of current device.
1599  */
1600 static int dasd_eckd_validate_server(struct dasd_device *device,
1601                                      unsigned long flags)
1602 {
1603         int rc;
1604         struct dasd_eckd_private *private;
1605         int enable_pav;
1606
1607         private = (struct dasd_eckd_private *) device->private;
1608         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1609             private->uid.type == UA_HYPER_PAV_ALIAS)
1610                 return 0;
1611         if (dasd_nopav || MACHINE_IS_VM)
1612                 enable_pav = 0;
1613         else
1614                 enable_pav = 1;
1615         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1616
1617         /* may be requested feature is not available on server,
1618          * therefore just report error and go ahead */
1619         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1620                         "returned rc=%d", private->uid.ssid, rc);
1621         return rc;
1622 }
1623
1624 /*
1625  * worker to do a validate server in case of a lost pathgroup
1626  */
1627 static void dasd_eckd_do_validate_server(struct work_struct *work)
1628 {
1629         struct dasd_device *device = container_of(work, struct dasd_device,
1630                                                   kick_validate);
1631         unsigned long flags = 0;
1632
1633         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1634         if (dasd_eckd_validate_server(device, flags)
1635             == -EAGAIN) {
1636                 /* schedule worker again if failed */
1637                 schedule_work(&device->kick_validate);
1638                 return;
1639         }
1640
1641         dasd_put_device(device);
1642 }
1643
1644 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1645 {
1646         dasd_get_device(device);
1647         /* exit if device not online or in offline processing */
1648         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1649            device->state < DASD_STATE_ONLINE) {
1650                 dasd_put_device(device);
1651                 return;
1652         }
1653         /* queue call to do_validate_server to the kernel event daemon. */
1654         if (!schedule_work(&device->kick_validate))
1655                 dasd_put_device(device);
1656 }
1657
1658 static u32 get_fcx_max_data(struct dasd_device *device)
1659 {
1660         int tpm, mdc;
1661         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1662         struct dasd_eckd_private *private;
1663
1664         if (dasd_nofcx)
1665                 return 0;
1666         /* is transport mode supported? */
1667         private = (struct dasd_eckd_private *) device->private;
1668         fcx_in_css = css_general_characteristics.fcx;
1669         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1670         fcx_in_features = private->features.feature[40] & 0x80;
1671         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1672
1673         if (!tpm)
1674                 return 0;
1675
1676         mdc = ccw_device_get_mdc(device->cdev, 0);
1677         if (mdc < 0) {
1678                 dev_warn(&device->cdev->dev, "Detecting the maximum supported"
1679                          " data size for zHPF requests failed\n");
1680                 return 0;
1681         } else
1682                 return mdc * FCX_MAX_DATA_FACTOR;
1683 }
1684
1685 /*
1686  * Check device characteristics.
1687  * If the device is accessible using ECKD discipline, the device is enabled.
1688  */
1689 static int
1690 dasd_eckd_check_characteristics(struct dasd_device *device)
1691 {
1692         struct dasd_eckd_private *private;
1693         struct dasd_block *block;
1694         struct dasd_uid temp_uid;
1695         int rc, i;
1696         int readonly;
1697         unsigned long value;
1698
1699         /* setup work queue for validate server*/
1700         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1701
1702         if (!ccw_device_is_pathgroup(device->cdev)) {
1703                 dev_warn(&device->cdev->dev,
1704                          "A channel path group could not be established\n");
1705                 return -EIO;
1706         }
1707         if (!ccw_device_is_multipath(device->cdev)) {
1708                 dev_info(&device->cdev->dev,
1709                          "The DASD is not operating in multipath mode\n");
1710         }
1711         private = (struct dasd_eckd_private *) device->private;
1712         if (!private) {
1713                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1714                 if (!private) {
1715                         dev_warn(&device->cdev->dev,
1716                                  "Allocating memory for private DASD data "
1717                                  "failed\n");
1718                         return -ENOMEM;
1719                 }
1720                 device->private = (void *) private;
1721         } else {
1722                 memset(private, 0, sizeof(*private));
1723         }
1724         /* Invalidate status of initial analysis. */
1725         private->init_cqr_status = -1;
1726         /* Set default cache operations. */
1727         private->attrib.operation = DASD_NORMAL_CACHE;
1728         private->attrib.nr_cyl = 0;
1729
1730         /* Read Configuration Data */
1731         rc = dasd_eckd_read_conf(device);
1732         if (rc)
1733                 goto out_err1;
1734
1735         /* set default timeout */
1736         device->default_expires = DASD_EXPIRES;
1737         /* set default retry count */
1738         device->default_retries = DASD_RETRIES;
1739
1740         if (private->gneq) {
1741                 value = 1;
1742                 for (i = 0; i < private->gneq->timeout.value; i++)
1743                         value = 10 * value;
1744                 value = value * private->gneq->timeout.number;
1745                 /* do not accept useless values */
1746                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1747                         device->default_expires = value;
1748         }
1749
1750         dasd_eckd_get_uid(device, &temp_uid);
1751         if (temp_uid.type == UA_BASE_DEVICE) {
1752                 block = dasd_alloc_block();
1753                 if (IS_ERR(block)) {
1754                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1755                                         "could not allocate dasd "
1756                                         "block structure");
1757                         rc = PTR_ERR(block);
1758                         goto out_err1;
1759                 }
1760                 device->block = block;
1761                 block->base = device;
1762         }
1763
1764         /* register lcu with alias handling, enable PAV */
1765         rc = dasd_alias_make_device_known_to_lcu(device);
1766         if (rc)
1767                 goto out_err2;
1768
1769         dasd_eckd_validate_server(device, 0);
1770
1771         /* device may report different configuration data after LCU setup */
1772         rc = dasd_eckd_read_conf(device);
1773         if (rc)
1774                 goto out_err3;
1775
1776         /* Read Feature Codes */
1777         dasd_eckd_read_features(device);
1778
1779         /* Read Device Characteristics */
1780         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1781                                          &private->rdc_data, 64);
1782         if (rc) {
1783                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1784                                 "Read device characteristic failed, rc=%d", rc);
1785                 goto out_err3;
1786         }
1787
1788         if ((device->features & DASD_FEATURE_USERAW) &&
1789             !(private->rdc_data.facilities.RT_in_LR)) {
1790                 dev_err(&device->cdev->dev, "The storage server does not "
1791                         "support raw-track access\n");
1792                 rc = -EINVAL;
1793                 goto out_err3;
1794         }
1795
1796         /* find the valid cylinder size */
1797         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1798             private->rdc_data.long_no_cyl)
1799                 private->real_cyl = private->rdc_data.long_no_cyl;
1800         else
1801                 private->real_cyl = private->rdc_data.no_cyl;
1802
1803         private->fcx_max_data = get_fcx_max_data(device);
1804
1805         readonly = dasd_device_is_ro(device);
1806         if (readonly)
1807                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1808
1809         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1810                  "with %d cylinders, %d heads, %d sectors%s\n",
1811                  private->rdc_data.dev_type,
1812                  private->rdc_data.dev_model,
1813                  private->rdc_data.cu_type,
1814                  private->rdc_data.cu_model.model,
1815                  private->real_cyl,
1816                  private->rdc_data.trk_per_cyl,
1817                  private->rdc_data.sec_per_trk,
1818                  readonly ? ", read-only device" : "");
1819         return 0;
1820
1821 out_err3:
1822         dasd_alias_disconnect_device_from_lcu(device);
1823 out_err2:
1824         dasd_free_block(device->block);
1825         device->block = NULL;
1826 out_err1:
1827         kfree(private->conf_data);
1828         kfree(device->private);
1829         device->private = NULL;
1830         return rc;
1831 }
1832
1833 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1834 {
1835         struct dasd_eckd_private *private;
1836         int i;
1837
1838         private = (struct dasd_eckd_private *) device->private;
1839         dasd_alias_disconnect_device_from_lcu(device);
1840         private->ned = NULL;
1841         private->sneq = NULL;
1842         private->vdsneq = NULL;
1843         private->gneq = NULL;
1844         private->conf_len = 0;
1845         for (i = 0; i < 8; i++) {
1846                 kfree(private->path_conf_data[i]);
1847                 if ((__u8 *)private->path_conf_data[i] ==
1848                     private->conf_data) {
1849                         private->conf_data = NULL;
1850                         private->conf_len = 0;
1851                 }
1852                 private->path_conf_data[i] = NULL;
1853         }
1854         kfree(private->conf_data);
1855         private->conf_data = NULL;
1856 }
1857
1858 static struct dasd_ccw_req *
1859 dasd_eckd_analysis_ccw(struct dasd_device *device)
1860 {
1861         struct dasd_eckd_private *private;
1862         struct eckd_count *count_data;
1863         struct LO_eckd_data *LO_data;
1864         struct dasd_ccw_req *cqr;
1865         struct ccw1 *ccw;
1866         int cplength, datasize;
1867         int i;
1868
1869         private = (struct dasd_eckd_private *) device->private;
1870
1871         cplength = 8;
1872         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1873         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
1874         if (IS_ERR(cqr))
1875                 return cqr;
1876         ccw = cqr->cpaddr;
1877         /* Define extent for the first 3 tracks. */
1878         define_extent(ccw++, cqr->data, 0, 2,
1879                       DASD_ECKD_CCW_READ_COUNT, device);
1880         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1881         /* Locate record for the first 4 records on track 0. */
1882         ccw[-1].flags |= CCW_FLAG_CC;
1883         locate_record(ccw++, LO_data++, 0, 0, 4,
1884                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1885
1886         count_data = private->count_area;
1887         for (i = 0; i < 4; i++) {
1888                 ccw[-1].flags |= CCW_FLAG_CC;
1889                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1890                 ccw->flags = 0;
1891                 ccw->count = 8;
1892                 ccw->cda = (__u32)(addr_t) count_data;
1893                 ccw++;
1894                 count_data++;
1895         }
1896
1897         /* Locate record for the first record on track 2. */
1898         ccw[-1].flags |= CCW_FLAG_CC;
1899         locate_record(ccw++, LO_data++, 2, 0, 1,
1900                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1901         /* Read count ccw. */
1902         ccw[-1].flags |= CCW_FLAG_CC;
1903         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1904         ccw->flags = 0;
1905         ccw->count = 8;
1906         ccw->cda = (__u32)(addr_t) count_data;
1907
1908         cqr->block = NULL;
1909         cqr->startdev = device;
1910         cqr->memdev = device;
1911         cqr->retries = 255;
1912         cqr->buildclk = get_tod_clock();
1913         cqr->status = DASD_CQR_FILLED;
1914         return cqr;
1915 }
1916
1917 /* differentiate between 'no record found' and any other error */
1918 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1919 {
1920         char *sense;
1921         if (init_cqr->status == DASD_CQR_DONE)
1922                 return INIT_CQR_OK;
1923         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1924                  init_cqr->status == DASD_CQR_FAILED) {
1925                 sense = dasd_get_sense(&init_cqr->irb);
1926                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1927                         return INIT_CQR_UNFORMATTED;
1928                 else
1929                         return INIT_CQR_ERROR;
1930         } else
1931                 return INIT_CQR_ERROR;
1932 }
1933
1934 /*
1935  * This is the callback function for the init_analysis cqr. It saves
1936  * the status of the initial analysis ccw before it frees it and kicks
1937  * the device to continue the startup sequence. This will call
1938  * dasd_eckd_do_analysis again (if the devices has not been marked
1939  * for deletion in the meantime).
1940  */
1941 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1942                                         void *data)
1943 {
1944         struct dasd_eckd_private *private;
1945         struct dasd_device *device;
1946
1947         device = init_cqr->startdev;
1948         private = (struct dasd_eckd_private *) device->private;
1949         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1950         dasd_sfree_request(init_cqr, device);
1951         dasd_kick_device(device);
1952 }
1953
1954 static int dasd_eckd_start_analysis(struct dasd_block *block)
1955 {
1956         struct dasd_ccw_req *init_cqr;
1957
1958         init_cqr = dasd_eckd_analysis_ccw(block->base);
1959         if (IS_ERR(init_cqr))
1960                 return PTR_ERR(init_cqr);
1961         init_cqr->callback = dasd_eckd_analysis_callback;
1962         init_cqr->callback_data = NULL;
1963         init_cqr->expires = 5*HZ;
1964         /* first try without ERP, so we can later handle unformatted
1965          * devices as special case
1966          */
1967         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1968         init_cqr->retries = 0;
1969         dasd_add_request_head(init_cqr);
1970         return -EAGAIN;
1971 }
1972
1973 static int dasd_eckd_end_analysis(struct dasd_block *block)
1974 {
1975         struct dasd_device *device;
1976         struct dasd_eckd_private *private;
1977         struct eckd_count *count_area;
1978         unsigned int sb, blk_per_trk;
1979         int status, i;
1980         struct dasd_ccw_req *init_cqr;
1981
1982         device = block->base;
1983         private = (struct dasd_eckd_private *) device->private;
1984         status = private->init_cqr_status;
1985         private->init_cqr_status = -1;
1986         if (status == INIT_CQR_ERROR) {
1987                 /* try again, this time with full ERP */
1988                 init_cqr = dasd_eckd_analysis_ccw(device);
1989                 dasd_sleep_on(init_cqr);
1990                 status = dasd_eckd_analysis_evaluation(init_cqr);
1991                 dasd_sfree_request(init_cqr, device);
1992         }
1993
1994         if (device->features & DASD_FEATURE_USERAW) {
1995                 block->bp_block = DASD_RAW_BLOCKSIZE;
1996                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1997                 block->s2b_shift = 3;
1998                 goto raw;
1999         }
2000
2001         if (status == INIT_CQR_UNFORMATTED) {
2002                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
2003                 return -EMEDIUMTYPE;
2004         } else if (status == INIT_CQR_ERROR) {
2005                 dev_err(&device->cdev->dev,
2006                         "Detecting the DASD disk layout failed because "
2007                         "of an I/O error\n");
2008                 return -EIO;
2009         }
2010
2011         private->uses_cdl = 1;
2012         /* Check Track 0 for Compatible Disk Layout */
2013         count_area = NULL;
2014         for (i = 0; i < 3; i++) {
2015                 if (private->count_area[i].kl != 4 ||
2016                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
2017                     private->count_area[i].cyl != 0 ||
2018                     private->count_area[i].head != count_area_head[i] ||
2019                     private->count_area[i].record != count_area_rec[i]) {
2020                         private->uses_cdl = 0;
2021                         break;
2022                 }
2023         }
2024         if (i == 3)
2025                 count_area = &private->count_area[4];
2026
2027         if (private->uses_cdl == 0) {
2028                 for (i = 0; i < 5; i++) {
2029                         if ((private->count_area[i].kl != 0) ||
2030                             (private->count_area[i].dl !=
2031                              private->count_area[0].dl) ||
2032                             private->count_area[i].cyl !=  0 ||
2033                             private->count_area[i].head != count_area_head[i] ||
2034                             private->count_area[i].record != count_area_rec[i])
2035                                 break;
2036                 }
2037                 if (i == 5)
2038                         count_area = &private->count_area[0];
2039         } else {
2040                 if (private->count_area[3].record == 1)
2041                         dev_warn(&device->cdev->dev,
2042                                  "Track 0 has no records following the VTOC\n");
2043         }
2044
2045         if (count_area != NULL && count_area->kl == 0) {
2046                 /* we found notthing violating our disk layout */
2047                 if (dasd_check_blocksize(count_area->dl) == 0)
2048                         block->bp_block = count_area->dl;
2049         }
2050         if (block->bp_block == 0) {
2051                 dev_warn(&device->cdev->dev,
2052                          "The disk layout of the DASD is not supported\n");
2053                 return -EMEDIUMTYPE;
2054         }
2055         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
2056         for (sb = 512; sb < block->bp_block; sb = sb << 1)
2057                 block->s2b_shift++;
2058
2059         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2060
2061 raw:
2062         block->blocks = (private->real_cyl *
2063                           private->rdc_data.trk_per_cyl *
2064                           blk_per_trk);
2065
2066         dev_info(&device->cdev->dev,
2067                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2068                  "%s\n", (block->bp_block >> 10),
2069                  ((private->real_cyl *
2070                    private->rdc_data.trk_per_cyl *
2071                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2072                  ((blk_per_trk * block->bp_block) >> 10),
2073                  private->uses_cdl ?
2074                  "compatible disk layout" : "linux disk layout");
2075
2076         return 0;
2077 }
2078
2079 static int dasd_eckd_do_analysis(struct dasd_block *block)
2080 {
2081         struct dasd_eckd_private *private;
2082
2083         private = (struct dasd_eckd_private *) block->base->private;
2084         if (private->init_cqr_status < 0)
2085                 return dasd_eckd_start_analysis(block);
2086         else
2087                 return dasd_eckd_end_analysis(block);
2088 }
2089
2090 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2091 {
2092         return dasd_alias_add_device(device);
2093 };
2094
2095 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2096 {
2097         cancel_work_sync(&device->reload_device);
2098         cancel_work_sync(&device->kick_validate);
2099         return 0;
2100 };
2101
2102 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2103 {
2104         return dasd_alias_remove_device(device);
2105 };
2106
2107 static int
2108 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2109 {
2110         struct dasd_eckd_private *private;
2111
2112         private = (struct dasd_eckd_private *) block->base->private;
2113         if (dasd_check_blocksize(block->bp_block) == 0) {
2114                 geo->sectors = recs_per_track(&private->rdc_data,
2115                                               0, block->bp_block);
2116         }
2117         geo->cylinders = private->rdc_data.no_cyl;
2118         geo->heads = private->rdc_data.trk_per_cyl;
2119         return 0;
2120 }
2121
2122 static struct dasd_ccw_req *
2123 dasd_eckd_build_format(struct dasd_device *base,
2124                        struct format_data_t *fdata,
2125                        int enable_pav)
2126 {
2127         struct dasd_eckd_private *base_priv;
2128         struct dasd_eckd_private *start_priv;
2129         struct dasd_device *startdev = NULL;
2130         struct dasd_ccw_req *fcp;
2131         struct eckd_count *ect;
2132         struct ch_t address;
2133         struct ccw1 *ccw;
2134         void *data;
2135         int rpt;
2136         int cplength, datasize;
2137         int i, j;
2138         int intensity = 0;
2139         int r0_perm;
2140         int nr_tracks;
2141         int use_prefix;
2142
2143         if (enable_pav)
2144                 startdev = dasd_alias_get_start_dev(base);
2145
2146         if (!startdev)
2147                 startdev = base;
2148
2149         start_priv = (struct dasd_eckd_private *) startdev->private;
2150         base_priv = (struct dasd_eckd_private *) base->private;
2151
2152         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2153
2154         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2155
2156         /*
2157          * fdata->intensity is a bit string that tells us what to do:
2158          *   Bit 0: write record zero
2159          *   Bit 1: write home address, currently not supported
2160          *   Bit 2: invalidate tracks
2161          *   Bit 3: use OS/390 compatible disk layout (cdl)
2162          *   Bit 4: do not allow storage subsystem to modify record zero
2163          * Only some bit combinations do make sense.
2164          */
2165         if (fdata->intensity & 0x10) {
2166                 r0_perm = 0;
2167                 intensity = fdata->intensity & ~0x10;
2168         } else {
2169                 r0_perm = 1;
2170                 intensity = fdata->intensity;
2171         }
2172
2173         use_prefix = base_priv->features.feature[8] & 0x01;
2174
2175         switch (intensity) {
2176         case 0x00:      /* Normal format */
2177         case 0x08:      /* Normal format, use cdl. */
2178                 cplength = 2 + (rpt*nr_tracks);
2179                 if (use_prefix)
2180                         datasize = sizeof(struct PFX_eckd_data) +
2181                                 sizeof(struct LO_eckd_data) +
2182                                 rpt * nr_tracks * sizeof(struct eckd_count);
2183                 else
2184                         datasize = sizeof(struct DE_eckd_data) +
2185                                 sizeof(struct LO_eckd_data) +
2186                                 rpt * nr_tracks * sizeof(struct eckd_count);
2187                 break;
2188         case 0x01:      /* Write record zero and format track. */
2189         case 0x09:      /* Write record zero and format track, use cdl. */
2190                 cplength = 2 + rpt * nr_tracks;
2191                 if (use_prefix)
2192                         datasize = sizeof(struct PFX_eckd_data) +
2193                                 sizeof(struct LO_eckd_data) +
2194                                 sizeof(struct eckd_count) +
2195                                 rpt * nr_tracks * 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                                 rpt * nr_tracks * sizeof(struct eckd_count);
2201                 break;
2202         case 0x04:      /* Invalidate track. */
2203         case 0x0c:      /* Invalidate track, use cdl. */
2204                 cplength = 3;
2205                 if (use_prefix)
2206                         datasize = sizeof(struct PFX_eckd_data) +
2207                                 sizeof(struct LO_eckd_data) +
2208                                 sizeof(struct eckd_count);
2209                 else
2210                         datasize = sizeof(struct DE_eckd_data) +
2211                                 sizeof(struct LO_eckd_data) +
2212                                 sizeof(struct eckd_count);
2213                 break;
2214         default:
2215                 dev_warn(&startdev->cdev->dev,
2216                          "An I/O control call used incorrect flags 0x%x\n",
2217                          fdata->intensity);
2218                 return ERR_PTR(-EINVAL);
2219         }
2220         /* Allocate the format ccw request. */
2221         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2222                                    datasize, startdev);
2223         if (IS_ERR(fcp))
2224                 return fcp;
2225
2226         start_priv->count++;
2227         data = fcp->data;
2228         ccw = fcp->cpaddr;
2229
2230         switch (intensity & ~0x08) {
2231         case 0x00: /* Normal format. */
2232                 if (use_prefix) {
2233                         prefix(ccw++, (struct PFX_eckd_data *) data,
2234                                fdata->start_unit, fdata->stop_unit,
2235                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2236                         /* grant subsystem permission to format R0 */
2237                         if (r0_perm)
2238                                 ((struct PFX_eckd_data *)data)
2239                                         ->define_extent.ga_extended |= 0x04;
2240                         data += sizeof(struct PFX_eckd_data);
2241                 } else {
2242                         define_extent(ccw++, (struct DE_eckd_data *) data,
2243                                       fdata->start_unit, fdata->stop_unit,
2244                                       DASD_ECKD_CCW_WRITE_CKD, startdev);
2245                         /* grant subsystem permission to format R0 */
2246                         if (r0_perm)
2247                                 ((struct DE_eckd_data *) data)
2248                                         ->ga_extended |= 0x04;
2249                         data += sizeof(struct DE_eckd_data);
2250                 }
2251                 ccw[-1].flags |= CCW_FLAG_CC;
2252                 locate_record(ccw++, (struct LO_eckd_data *) data,
2253                               fdata->start_unit, 0, rpt*nr_tracks,
2254                               DASD_ECKD_CCW_WRITE_CKD, base,
2255                               fdata->blksize);
2256                 data += sizeof(struct LO_eckd_data);
2257                 break;
2258         case 0x01: /* Write record zero + format track. */
2259                 if (use_prefix) {
2260                         prefix(ccw++, (struct PFX_eckd_data *) data,
2261                                fdata->start_unit, fdata->stop_unit,
2262                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2263                                base, startdev);
2264                         data += sizeof(struct PFX_eckd_data);
2265                 } else {
2266                         define_extent(ccw++, (struct DE_eckd_data *) data,
2267                                fdata->start_unit, fdata->stop_unit,
2268                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev);
2269                         data += sizeof(struct DE_eckd_data);
2270                 }
2271                 ccw[-1].flags |= CCW_FLAG_CC;
2272                 locate_record(ccw++, (struct LO_eckd_data *) data,
2273                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2274                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2275                               base->block->bp_block);
2276                 data += sizeof(struct LO_eckd_data);
2277                 break;
2278         case 0x04: /* Invalidate track. */
2279                 if (use_prefix) {
2280                         prefix(ccw++, (struct PFX_eckd_data *) data,
2281                                fdata->start_unit, fdata->stop_unit,
2282                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2283                         data += sizeof(struct PFX_eckd_data);
2284                 } else {
2285                         define_extent(ccw++, (struct DE_eckd_data *) data,
2286                                fdata->start_unit, fdata->stop_unit,
2287                                DASD_ECKD_CCW_WRITE_CKD, startdev);
2288                         data += sizeof(struct DE_eckd_data);
2289                 }
2290                 ccw[-1].flags |= CCW_FLAG_CC;
2291                 locate_record(ccw++, (struct LO_eckd_data *) data,
2292                               fdata->start_unit, 0, 1,
2293                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2294                 data += sizeof(struct LO_eckd_data);
2295                 break;
2296         }
2297
2298         for (j = 0; j < nr_tracks; j++) {
2299                 /* calculate cylinder and head for the current track */
2300                 set_ch_t(&address,
2301                          (fdata->start_unit + j) /
2302                          base_priv->rdc_data.trk_per_cyl,
2303                          (fdata->start_unit + j) %
2304                          base_priv->rdc_data.trk_per_cyl);
2305                 if (intensity & 0x01) { /* write record zero */
2306                         ect = (struct eckd_count *) data;
2307                         data += sizeof(struct eckd_count);
2308                         ect->cyl = address.cyl;
2309                         ect->head = address.head;
2310                         ect->record = 0;
2311                         ect->kl = 0;
2312                         ect->dl = 8;
2313                         ccw[-1].flags |= CCW_FLAG_CC;
2314                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2315                         ccw->flags = CCW_FLAG_SLI;
2316                         ccw->count = 8;
2317                         ccw->cda = (__u32)(addr_t) ect;
2318                         ccw++;
2319                 }
2320                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2321                         ect = (struct eckd_count *) data;
2322                         data += sizeof(struct eckd_count);
2323                         ect->cyl = address.cyl;
2324                         ect->head = address.head;
2325                         ect->record = 1;
2326                         ect->kl = 0;
2327                         ect->dl = 0;
2328                         ccw[-1].flags |= CCW_FLAG_CC;
2329                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2330                         ccw->flags = CCW_FLAG_SLI;
2331                         ccw->count = 8;
2332                         ccw->cda = (__u32)(addr_t) ect;
2333                 } else {                /* write remaining records */
2334                         for (i = 0; i < rpt; i++) {
2335                                 ect = (struct eckd_count *) data;
2336                                 data += sizeof(struct eckd_count);
2337                                 ect->cyl = address.cyl;
2338                                 ect->head = address.head;
2339                                 ect->record = i + 1;
2340                                 ect->kl = 0;
2341                                 ect->dl = fdata->blksize;
2342                                 /*
2343                                  * Check for special tracks 0-1
2344                                  * when formatting CDL
2345                                  */
2346                                 if ((intensity & 0x08) &&
2347                                     fdata->start_unit == 0) {
2348                                         if (i < 3) {
2349                                                 ect->kl = 4;
2350                                                 ect->dl = sizes_trk0[i] - 4;
2351                                         }
2352                                 }
2353                                 if ((intensity & 0x08) &&
2354                                     fdata->start_unit == 1) {
2355                                         ect->kl = 44;
2356                                         ect->dl = LABEL_SIZE - 44;
2357                                 }
2358                                 ccw[-1].flags |= CCW_FLAG_CC;
2359                                 if (i != 0 || j == 0)
2360                                         ccw->cmd_code =
2361                                                 DASD_ECKD_CCW_WRITE_CKD;
2362                                 else
2363                                         ccw->cmd_code =
2364                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2365                                 ccw->flags = CCW_FLAG_SLI;
2366                                 ccw->count = 8;
2367                                         ccw->cda = (__u32)(addr_t) ect;
2368                                         ccw++;
2369                         }
2370                 }
2371         }
2372
2373         fcp->startdev = startdev;
2374         fcp->memdev = startdev;
2375         fcp->basedev = base;
2376         fcp->retries = 256;
2377         fcp->expires = startdev->default_expires * HZ;
2378         fcp->buildclk = get_tod_clock();
2379         fcp->status = DASD_CQR_FILLED;
2380
2381         return fcp;
2382 }
2383
2384 static int
2385 dasd_eckd_format_device(struct dasd_device *base,
2386                         struct format_data_t *fdata,
2387                         int enable_pav)
2388 {
2389         struct dasd_ccw_req *cqr, *n;
2390         struct dasd_block *block;
2391         struct dasd_eckd_private *private;
2392         struct list_head format_queue;
2393         struct dasd_device *device;
2394         int old_stop, format_step;
2395         int step, rc = 0, sleep_rc;
2396
2397         block = base->block;
2398         private = (struct dasd_eckd_private *) base->private;
2399
2400         /* Sanity checks. */
2401         if (fdata->start_unit >=
2402             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2403                 dev_warn(&base->cdev->dev,
2404                          "Start track number %u used in formatting is too big\n",
2405                          fdata->start_unit);
2406                 return -EINVAL;
2407         }
2408         if (fdata->stop_unit >=
2409             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2410                 dev_warn(&base->cdev->dev,
2411                          "Stop track number %u used in formatting is too big\n",
2412                          fdata->stop_unit);
2413                 return -EINVAL;
2414         }
2415         if (fdata->start_unit > fdata->stop_unit) {
2416                 dev_warn(&base->cdev->dev,
2417                          "Start track %u used in formatting exceeds end track\n",
2418                          fdata->start_unit);
2419                 return -EINVAL;
2420         }
2421         if (dasd_check_blocksize(fdata->blksize) != 0) {
2422                 dev_warn(&base->cdev->dev,
2423                          "The DASD cannot be formatted with block size %u\n",
2424                          fdata->blksize);
2425                 return -EINVAL;
2426         }
2427
2428         INIT_LIST_HEAD(&format_queue);
2429
2430         old_stop = fdata->stop_unit;
2431         while (fdata->start_unit <= 1) {
2432                 fdata->stop_unit = fdata->start_unit;
2433                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2434                 list_add(&cqr->blocklist, &format_queue);
2435
2436                 fdata->stop_unit = old_stop;
2437                 fdata->start_unit++;
2438
2439                 if (fdata->start_unit > fdata->stop_unit)
2440                         goto sleep;
2441         }
2442
2443 retry:
2444         format_step = 255 / recs_per_track(&private->rdc_data, 0,
2445                                            fdata->blksize);
2446         while (fdata->start_unit <= old_stop) {
2447                 step = fdata->stop_unit - fdata->start_unit + 1;
2448                 if (step > format_step)
2449                         fdata->stop_unit = fdata->start_unit + format_step - 1;
2450
2451                 cqr = dasd_eckd_build_format(base, fdata, enable_pav);
2452                 if (IS_ERR(cqr)) {
2453                         if (PTR_ERR(cqr) == -ENOMEM) {
2454                                 /*
2455                                  * not enough memory available
2456                                  * go to out and start requests
2457                                  * retry after first requests were finished
2458                                  */
2459                                 fdata->stop_unit = old_stop;
2460                                 goto sleep;
2461                         } else
2462                                 return PTR_ERR(cqr);
2463                 }
2464                 list_add(&cqr->blocklist, &format_queue);
2465
2466                 fdata->start_unit = fdata->stop_unit + 1;
2467                 fdata->stop_unit = old_stop;
2468         }
2469
2470 sleep:
2471         sleep_rc = dasd_sleep_on_queue(&format_queue);
2472
2473         list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2474                 device = cqr->startdev;
2475                 private = (struct dasd_eckd_private *) device->private;
2476                 if (cqr->status == DASD_CQR_FAILED)
2477                         rc = -EIO;
2478                 list_del_init(&cqr->blocklist);
2479                 dasd_sfree_request(cqr, device);
2480                 private->count--;
2481         }
2482
2483         if (sleep_rc)
2484                 return sleep_rc;
2485
2486         /*
2487          * in case of ENOMEM we need to retry after
2488          * first requests are finished
2489          */
2490         if (fdata->start_unit <= fdata->stop_unit)
2491                 goto retry;
2492
2493         return rc;
2494 }
2495
2496 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2497 {
2498         if (cqr->retries < 0) {
2499                 cqr->status = DASD_CQR_FAILED;
2500                 return;
2501         }
2502         cqr->status = DASD_CQR_FILLED;
2503         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2504                 dasd_eckd_reset_ccw_to_base_io(cqr);
2505                 cqr->startdev = cqr->block->base;
2506                 cqr->lpm = cqr->block->base->path_data.opm;
2507         }
2508 };
2509
2510 static dasd_erp_fn_t
2511 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2512 {
2513         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2514         struct ccw_device *cdev = device->cdev;
2515
2516         switch (cdev->id.cu_type) {
2517         case 0x3990:
2518         case 0x2105:
2519         case 0x2107:
2520         case 0x1750:
2521                 return dasd_3990_erp_action;
2522         case 0x9343:
2523         case 0x3880:
2524         default:
2525                 return dasd_default_erp_action;
2526         }
2527 }
2528
2529 static dasd_erp_fn_t
2530 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2531 {
2532         return dasd_default_erp_postaction;
2533 }
2534
2535 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2536                                               struct dasd_ccw_req *cqr,
2537                                               struct irb *irb)
2538 {
2539         char mask;
2540         char *sense = NULL;
2541         struct dasd_eckd_private *private;
2542
2543         private = (struct dasd_eckd_private *) device->private;
2544         /* first of all check for state change pending interrupt */
2545         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2546         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2547                 /*
2548                  * for alias only, not in offline processing
2549                  * and only if not suspended
2550                  */
2551                 if (!device->block && private->lcu &&
2552                     device->state == DASD_STATE_ONLINE &&
2553                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2554                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2555                         /*
2556                          * the state change could be caused by an alias
2557                          * reassignment remove device from alias handling
2558                          * to prevent new requests from being scheduled on
2559                          * the wrong alias device
2560                          */
2561                         dasd_alias_remove_device(device);
2562
2563                         /* schedule worker to reload device */
2564                         dasd_reload_device(device);
2565                 }
2566                 dasd_generic_handle_state_change(device);
2567                 return;
2568         }
2569
2570         sense = dasd_get_sense(irb);
2571         if (!sense)
2572                 return;
2573
2574         /* summary unit check */
2575         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2576             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2577                 dasd_alias_handle_summary_unit_check(device, irb);
2578                 return;
2579         }
2580
2581         /* service information message SIM */
2582         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
2583             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
2584                 dasd_3990_erp_handle_sim(device, sense);
2585                 return;
2586         }
2587
2588         /* loss of device reservation is handled via base devices only
2589          * as alias devices may be used with several bases
2590          */
2591         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
2592             (sense[7] == 0x3F) &&
2593             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
2594             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
2595                 if (device->features & DASD_FEATURE_FAILONSLCK)
2596                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
2597                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
2598                 dev_err(&device->cdev->dev,
2599                         "The device reservation was lost\n");
2600         }
2601 }
2602
2603 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
2604                                                struct dasd_device *startdev,
2605                                                struct dasd_block *block,
2606                                                struct request *req,
2607                                                sector_t first_rec,
2608                                                sector_t last_rec,
2609                                                sector_t first_trk,
2610                                                sector_t last_trk,
2611                                                unsigned int first_offs,
2612                                                unsigned int last_offs,
2613                                                unsigned int blk_per_trk,
2614                                                unsigned int blksize)
2615 {
2616         struct dasd_eckd_private *private;
2617         unsigned long *idaws;
2618         struct LO_eckd_data *LO_data;
2619         struct dasd_ccw_req *cqr;
2620         struct ccw1 *ccw;
2621         struct req_iterator iter;
2622         struct bio_vec bv;
2623         char *dst;
2624         unsigned int off;
2625         int count, cidaw, cplength, datasize;
2626         sector_t recid;
2627         unsigned char cmd, rcmd;
2628         int use_prefix;
2629         struct dasd_device *basedev;
2630
2631         basedev = block->base;
2632         private = (struct dasd_eckd_private *) basedev->private;
2633         if (rq_data_dir(req) == READ)
2634                 cmd = DASD_ECKD_CCW_READ_MT;
2635         else if (rq_data_dir(req) == WRITE)
2636                 cmd = DASD_ECKD_CCW_WRITE_MT;
2637         else
2638                 return ERR_PTR(-EINVAL);
2639
2640         /* Check struct bio and count the number of blocks for the request. */
2641         count = 0;
2642         cidaw = 0;
2643         rq_for_each_segment(bv, req, iter) {
2644                 if (bv.bv_len & (blksize - 1))
2645                         /* Eckd can only do full blocks. */
2646                         return ERR_PTR(-EINVAL);
2647                 count += bv.bv_len >> (block->s2b_shift + 9);
2648                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
2649                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
2650         }
2651         /* Paranoia. */
2652         if (count != last_rec - first_rec + 1)
2653                 return ERR_PTR(-EINVAL);
2654
2655         /* use the prefix command if available */
2656         use_prefix = private->features.feature[8] & 0x01;
2657         if (use_prefix) {
2658                 /* 1x prefix + number of blocks */
2659                 cplength = 2 + count;
2660                 /* 1x prefix + cidaws*sizeof(long) */
2661                 datasize = sizeof(struct PFX_eckd_data) +
2662                         sizeof(struct LO_eckd_data) +
2663                         cidaw * sizeof(unsigned long);
2664         } else {
2665                 /* 1x define extent + 1x locate record + number of blocks */
2666                 cplength = 2 + count;
2667                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
2668                 datasize = sizeof(struct DE_eckd_data) +
2669                         sizeof(struct LO_eckd_data) +
2670                         cidaw * sizeof(unsigned long);
2671         }
2672         /* Find out the number of additional locate record ccws for cdl. */
2673         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
2674                 if (last_rec >= 2*blk_per_trk)
2675                         count = 2*blk_per_trk - first_rec;
2676                 cplength += count;
2677                 datasize += count*sizeof(struct LO_eckd_data);
2678         }
2679         /* Allocate the ccw request. */
2680         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2681                                    startdev);
2682         if (IS_ERR(cqr))
2683                 return cqr;
2684         ccw = cqr->cpaddr;
2685         /* First ccw is define extent or prefix. */
2686         if (use_prefix) {
2687                 if (prefix(ccw++, cqr->data, first_trk,
2688                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
2689                         /* Clock not in sync and XRC is enabled.
2690                          * Try again later.
2691                          */
2692                         dasd_sfree_request(cqr, startdev);
2693                         return ERR_PTR(-EAGAIN);
2694                 }
2695                 idaws = (unsigned long *) (cqr->data +
2696                                            sizeof(struct PFX_eckd_data));
2697         } else {
2698                 if (define_extent(ccw++, cqr->data, first_trk,
2699                                   last_trk, cmd, basedev) == -EAGAIN) {
2700                         /* Clock not in sync and XRC is enabled.
2701                          * Try again later.
2702                          */
2703                         dasd_sfree_request(cqr, startdev);
2704                         return ERR_PTR(-EAGAIN);
2705                 }
2706                 idaws = (unsigned long *) (cqr->data +
2707                                            sizeof(struct DE_eckd_data));
2708         }
2709         /* Build locate_record+read/write/ccws. */
2710         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
2711         recid = first_rec;
2712         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
2713                 /* Only standard blocks so there is just one locate record. */
2714                 ccw[-1].flags |= CCW_FLAG_CC;
2715                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
2716                               last_rec - recid + 1, cmd, basedev, blksize);
2717         }
2718         rq_for_each_segment(bv, req, iter) {
2719                 dst = page_address(bv.bv_page) + bv.bv_offset;
2720                 if (dasd_page_cache) {
2721                         char *copy = kmem_cache_alloc(dasd_page_cache,
2722                                                       GFP_DMA | __GFP_NOWARN);
2723                         if (copy && rq_data_dir(req) == WRITE)
2724                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
2725                         if (copy)
2726                                 dst = copy + bv.bv_offset;
2727                 }
2728                 for (off = 0; off < bv.bv_len; off += blksize) {
2729                         sector_t trkid = recid;
2730                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
2731                         rcmd = cmd;
2732                         count = blksize;
2733                         /* Locate record for cdl special block ? */
2734                         if (private->uses_cdl && recid < 2*blk_per_trk) {
2735                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
2736                                         rcmd |= 0x8;
2737                                         count = dasd_eckd_cdl_reclen(recid);
2738                                         if (count < blksize &&
2739                                             rq_data_dir(req) == READ)
2740                                                 memset(dst + count, 0xe5,
2741                                                        blksize - count);
2742                                 }
2743                                 ccw[-1].flags |= CCW_FLAG_CC;
2744                                 locate_record(ccw++, LO_data++,
2745                                               trkid, recoffs + 1,
2746                                               1, rcmd, basedev, count);
2747                         }
2748                         /* Locate record for standard blocks ? */
2749                         if (private->uses_cdl && recid == 2*blk_per_trk) {
2750                                 ccw[-1].flags |= CCW_FLAG_CC;
2751                                 locate_record(ccw++, LO_data++,
2752                                               trkid, recoffs + 1,
2753                                               last_rec - recid + 1,
2754                                               cmd, basedev, count);
2755                         }
2756                         /* Read/write ccw. */
2757                         ccw[-1].flags |= CCW_FLAG_CC;
2758                         ccw->cmd_code = rcmd;
2759                         ccw->count = count;
2760                         if (idal_is_needed(dst, blksize)) {
2761                                 ccw->cda = (__u32)(addr_t) idaws;
2762                                 ccw->flags = CCW_FLAG_IDA;
2763                                 idaws = idal_create_words(idaws, dst, blksize);
2764                         } else {
2765                                 ccw->cda = (__u32)(addr_t) dst;
2766                                 ccw->flags = 0;
2767                         }
2768                         ccw++;
2769                         dst += blksize;
2770                         recid++;
2771                 }
2772         }
2773         if (blk_noretry_request(req) ||
2774             block->base->features & DASD_FEATURE_FAILFAST)
2775                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2776         cqr->startdev = startdev;
2777         cqr->memdev = startdev;
2778         cqr->block = block;
2779         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2780         cqr->lpm = startdev->path_data.ppm;
2781         cqr->retries = startdev->default_retries;
2782         cqr->buildclk = get_tod_clock();
2783         cqr->status = DASD_CQR_FILLED;
2784         return cqr;
2785 }
2786
2787 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
2788                                                struct dasd_device *startdev,
2789                                                struct dasd_block *block,
2790                                                struct request *req,
2791                                                sector_t first_rec,
2792                                                sector_t last_rec,
2793                                                sector_t first_trk,
2794                                                sector_t last_trk,
2795                                                unsigned int first_offs,
2796                                                unsigned int last_offs,
2797                                                unsigned int blk_per_trk,
2798                                                unsigned int blksize)
2799 {
2800         unsigned long *idaws;
2801         struct dasd_ccw_req *cqr;
2802         struct ccw1 *ccw;
2803         struct req_iterator iter;
2804         struct bio_vec bv;
2805         char *dst, *idaw_dst;
2806         unsigned int cidaw, cplength, datasize;
2807         unsigned int tlf;
2808         sector_t recid;
2809         unsigned char cmd;
2810         struct dasd_device *basedev;
2811         unsigned int trkcount, count, count_to_trk_end;
2812         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
2813         unsigned char new_track, end_idaw;
2814         sector_t trkid;
2815         unsigned int recoffs;
2816
2817         basedev = block->base;
2818         if (rq_data_dir(req) == READ)
2819                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
2820         else if (rq_data_dir(req) == WRITE)
2821                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
2822         else
2823                 return ERR_PTR(-EINVAL);
2824
2825         /* Track based I/O needs IDAWs for each page, and not just for
2826          * 64 bit addresses. We need additional idals for pages
2827          * that get filled from two tracks, so we use the number
2828          * of records as upper limit.
2829          */
2830         cidaw = last_rec - first_rec + 1;
2831         trkcount = last_trk - first_trk + 1;
2832
2833         /* 1x prefix + one read/write ccw per track */
2834         cplength = 1 + trkcount;
2835
2836         /* on 31-bit we need space for two 32 bit addresses per page
2837          * on 64-bit one 64 bit address
2838          */
2839         datasize = sizeof(struct PFX_eckd_data) +
2840                 cidaw * sizeof(unsigned long long);
2841
2842         /* Allocate the ccw request. */
2843         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2844                                    startdev);
2845         if (IS_ERR(cqr))
2846                 return cqr;
2847         ccw = cqr->cpaddr;
2848         /* transfer length factor: how many bytes to read from the last track */
2849         if (first_trk == last_trk)
2850                 tlf = last_offs - first_offs + 1;
2851         else
2852                 tlf = last_offs + 1;
2853         tlf *= blksize;
2854
2855         if (prefix_LRE(ccw++, cqr->data, first_trk,
2856                        last_trk, cmd, basedev, startdev,
2857                        1 /* format */, first_offs + 1,
2858                        trkcount, blksize,
2859                        tlf) == -EAGAIN) {
2860                 /* Clock not in sync and XRC is enabled.
2861                  * Try again later.
2862                  */
2863                 dasd_sfree_request(cqr, startdev);
2864                 return ERR_PTR(-EAGAIN);
2865         }
2866
2867         /*
2868          * The translation of request into ccw programs must meet the
2869          * following conditions:
2870          * - all idaws but the first and the last must address full pages
2871          *   (or 2K blocks on 31-bit)
2872          * - the scope of a ccw and it's idal ends with the track boundaries
2873          */
2874         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
2875         recid = first_rec;
2876         new_track = 1;
2877         end_idaw = 0;
2878         len_to_track_end = 0;
2879         idaw_dst = NULL;
2880         idaw_len = 0;
2881         rq_for_each_segment(bv, req, iter) {
2882                 dst = page_address(bv.bv_page) + bv.bv_offset;
2883                 seg_len = bv.bv_len;
2884                 while (seg_len) {
2885                         if (new_track) {
2886                                 trkid = recid;
2887                                 recoffs = sector_div(trkid, blk_per_trk);
2888                                 count_to_trk_end = blk_per_trk - recoffs;
2889                                 count = min((last_rec - recid + 1),
2890                                             (sector_t)count_to_trk_end);
2891                                 len_to_track_end = count * blksize;
2892                                 ccw[-1].flags |= CCW_FLAG_CC;
2893                                 ccw->cmd_code = cmd;
2894                                 ccw->count = len_to_track_end;
2895                                 ccw->cda = (__u32)(addr_t)idaws;
2896                                 ccw->flags = CCW_FLAG_IDA;
2897                                 ccw++;
2898                                 recid += count;
2899                                 new_track = 0;
2900                                 /* first idaw for a ccw may start anywhere */
2901                                 if (!idaw_dst)
2902                                         idaw_dst = dst;
2903                         }
2904                         /* If we start a new idaw, we must make sure that it
2905                          * starts on an IDA_BLOCK_SIZE boundary.
2906                          * If we continue an idaw, we must make sure that the
2907                          * current segment begins where the so far accumulated
2908                          * idaw ends
2909                          */
2910                         if (!idaw_dst) {
2911                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
2912                                         dasd_sfree_request(cqr, startdev);
2913                                         return ERR_PTR(-ERANGE);
2914                                 } else
2915                                         idaw_dst = dst;
2916                         }
2917                         if ((idaw_dst + idaw_len) != dst) {
2918                                 dasd_sfree_request(cqr, startdev);
2919                                 return ERR_PTR(-ERANGE);
2920                         }
2921                         part_len = min(seg_len, len_to_track_end);
2922                         seg_len -= part_len;
2923                         dst += part_len;
2924                         idaw_len += part_len;
2925                         len_to_track_end -= part_len;
2926                         /* collected memory area ends on an IDA_BLOCK border,
2927                          * -> create an idaw
2928                          * idal_create_words will handle cases where idaw_len
2929                          * is larger then IDA_BLOCK_SIZE
2930                          */
2931                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
2932                                 end_idaw = 1;
2933                         /* We also need to end the idaw at track end */
2934                         if (!len_to_track_end) {
2935                                 new_track = 1;
2936                                 end_idaw = 1;
2937                         }
2938                         if (end_idaw) {
2939                                 idaws = idal_create_words(idaws, idaw_dst,
2940                                                           idaw_len);
2941                                 idaw_dst = NULL;
2942                                 idaw_len = 0;
2943                                 end_idaw = 0;
2944                         }
2945                 }
2946         }
2947
2948         if (blk_noretry_request(req) ||
2949             block->base->features & DASD_FEATURE_FAILFAST)
2950                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
2951         cqr->startdev = startdev;
2952         cqr->memdev = startdev;
2953         cqr->block = block;
2954         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
2955         cqr->lpm = startdev->path_data.ppm;
2956         cqr->retries = startdev->default_retries;
2957         cqr->buildclk = get_tod_clock();
2958         cqr->status = DASD_CQR_FILLED;
2959         return cqr;
2960 }
2961
2962 static int prepare_itcw(struct itcw *itcw,
2963                         unsigned int trk, unsigned int totrk, int cmd,
2964                         struct dasd_device *basedev,
2965                         struct dasd_device *startdev,
2966                         unsigned int rec_on_trk, int count,
2967                         unsigned int blksize,
2968                         unsigned int total_data_size,
2969                         unsigned int tlf,
2970                         unsigned int blk_per_trk)
2971 {
2972         struct PFX_eckd_data pfxdata;
2973         struct dasd_eckd_private *basepriv, *startpriv;
2974         struct DE_eckd_data *dedata;
2975         struct LRE_eckd_data *lredata;
2976         struct dcw *dcw;
2977
2978         u32 begcyl, endcyl;
2979         u16 heads, beghead, endhead;
2980         u8 pfx_cmd;
2981
2982         int rc = 0;
2983         int sector = 0;
2984         int dn, d;
2985
2986
2987         /* setup prefix data */
2988         basepriv = (struct dasd_eckd_private *) basedev->private;
2989         startpriv = (struct dasd_eckd_private *) startdev->private;
2990         dedata = &pfxdata.define_extent;
2991         lredata = &pfxdata.locate_record;
2992
2993         memset(&pfxdata, 0, sizeof(pfxdata));
2994         pfxdata.format = 1; /* PFX with LRE */
2995         pfxdata.base_address = basepriv->ned->unit_addr;
2996         pfxdata.base_lss = basepriv->ned->ID;
2997         pfxdata.validity.define_extent = 1;
2998
2999         /* private uid is kept up to date, conf_data may be outdated */
3000         if (startpriv->uid.type != UA_BASE_DEVICE) {
3001                 pfxdata.validity.verify_base = 1;
3002                 if (startpriv->uid.type == UA_HYPER_PAV_ALIAS)
3003                         pfxdata.validity.hyper_pav = 1;
3004         }
3005
3006         switch (cmd) {
3007         case DASD_ECKD_CCW_READ_TRACK_DATA:
3008                 dedata->mask.perm = 0x1;
3009                 dedata->attributes.operation = basepriv->attrib.operation;
3010                 dedata->blk_size = blksize;
3011                 dedata->ga_extended |= 0x42;
3012                 lredata->operation.orientation = 0x0;
3013                 lredata->operation.operation = 0x0C;
3014                 lredata->auxiliary.check_bytes = 0x01;
3015                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3016                 break;
3017         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3018                 dedata->mask.perm = 0x02;
3019                 dedata->attributes.operation = basepriv->attrib.operation;
3020                 dedata->blk_size = blksize;
3021                 rc = check_XRC_on_prefix(&pfxdata, basedev);
3022                 dedata->ga_extended |= 0x42;
3023                 lredata->operation.orientation = 0x0;
3024                 lredata->operation.operation = 0x3F;
3025                 lredata->extended_operation = 0x23;
3026                 lredata->auxiliary.check_bytes = 0x2;
3027                 pfx_cmd = DASD_ECKD_CCW_PFX;
3028                 break;
3029         default:
3030                 DBF_DEV_EVENT(DBF_ERR, basedev,
3031                               "prepare itcw, unknown opcode 0x%x", cmd);
3032                 BUG();
3033                 break;
3034         }
3035         if (rc)
3036                 return rc;
3037
3038         dedata->attributes.mode = 0x3;  /* ECKD */
3039
3040         heads = basepriv->rdc_data.trk_per_cyl;
3041         begcyl = trk / heads;
3042         beghead = trk % heads;
3043         endcyl = totrk / heads;
3044         endhead = totrk % heads;
3045
3046         /* check for sequential prestage - enhance cylinder range */
3047         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3048             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3049
3050                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3051                         endcyl += basepriv->attrib.nr_cyl;
3052                 else
3053                         endcyl = (basepriv->real_cyl - 1);
3054         }
3055
3056         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3057         set_ch_t(&dedata->end_ext, endcyl, endhead);
3058
3059         dedata->ep_format = 0x20; /* records per track is valid */
3060         dedata->ep_rec_per_track = blk_per_trk;
3061
3062         if (rec_on_trk) {
3063                 switch (basepriv->rdc_data.dev_type) {
3064                 case 0x3390:
3065                         dn = ceil_quot(blksize + 6, 232);
3066                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3067                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3068                         break;
3069                 case 0x3380:
3070                         d = 7 + ceil_quot(blksize + 12, 32);
3071                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3072                         break;
3073                 }
3074         }
3075
3076         lredata->auxiliary.length_valid = 1;
3077         lredata->auxiliary.length_scope = 1;
3078         lredata->auxiliary.imbedded_ccw_valid = 1;
3079         lredata->length = tlf;
3080         lredata->imbedded_ccw = cmd;
3081         lredata->count = count;
3082         lredata->sector = sector;
3083         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3084         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3085         lredata->search_arg.head = lredata->seek_addr.head;
3086         lredata->search_arg.record = rec_on_trk;
3087
3088         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3089                      &pfxdata, sizeof(pfxdata), total_data_size);
3090         return PTR_RET(dcw);
3091 }
3092
3093 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3094                                                struct dasd_device *startdev,
3095                                                struct dasd_block *block,
3096                                                struct request *req,
3097                                                sector_t first_rec,
3098                                                sector_t last_rec,
3099                                                sector_t first_trk,
3100                                                sector_t last_trk,
3101                                                unsigned int first_offs,
3102                                                unsigned int last_offs,
3103                                                unsigned int blk_per_trk,
3104                                                unsigned int blksize)
3105 {
3106         struct dasd_ccw_req *cqr;
3107         struct req_iterator iter;
3108         struct bio_vec bv;
3109         char *dst;
3110         unsigned int trkcount, ctidaw;
3111         unsigned char cmd;
3112         struct dasd_device *basedev;
3113         unsigned int tlf;
3114         struct itcw *itcw;
3115         struct tidaw *last_tidaw = NULL;
3116         int itcw_op;
3117         size_t itcw_size;
3118         u8 tidaw_flags;
3119         unsigned int seg_len, part_len, len_to_track_end;
3120         unsigned char new_track;
3121         sector_t recid, trkid;
3122         unsigned int offs;
3123         unsigned int count, count_to_trk_end;
3124         int ret;
3125
3126         basedev = block->base;
3127         if (rq_data_dir(req) == READ) {
3128                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3129                 itcw_op = ITCW_OP_READ;
3130         } else if (rq_data_dir(req) == WRITE) {
3131                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3132                 itcw_op = ITCW_OP_WRITE;
3133         } else
3134                 return ERR_PTR(-EINVAL);
3135
3136         /* trackbased I/O needs address all memory via TIDAWs,
3137          * not just for 64 bit addresses. This allows us to map
3138          * each segment directly to one tidaw.
3139          * In the case of write requests, additional tidaws may
3140          * be needed when a segment crosses a track boundary.
3141          */
3142         trkcount = last_trk - first_trk + 1;
3143         ctidaw = 0;
3144         rq_for_each_segment(bv, req, iter) {
3145                 ++ctidaw;
3146         }
3147         if (rq_data_dir(req) == WRITE)
3148                 ctidaw += (last_trk - first_trk);
3149
3150         /* Allocate the ccw request. */
3151         itcw_size = itcw_calc_size(0, ctidaw, 0);
3152         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3153         if (IS_ERR(cqr))
3154                 return cqr;
3155
3156         /* transfer length factor: how many bytes to read from the last track */
3157         if (first_trk == last_trk)
3158                 tlf = last_offs - first_offs + 1;
3159         else
3160                 tlf = last_offs + 1;
3161         tlf *= blksize;
3162
3163         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3164         if (IS_ERR(itcw)) {
3165                 ret = -EINVAL;
3166                 goto out_error;
3167         }
3168         cqr->cpaddr = itcw_get_tcw(itcw);
3169         if (prepare_itcw(itcw, first_trk, last_trk,
3170                          cmd, basedev, startdev,
3171                          first_offs + 1,
3172                          trkcount, blksize,
3173                          (last_rec - first_rec + 1) * blksize,
3174                          tlf, blk_per_trk) == -EAGAIN) {
3175                 /* Clock not in sync and XRC is enabled.
3176                  * Try again later.
3177                  */
3178                 ret = -EAGAIN;
3179                 goto out_error;
3180         }
3181         len_to_track_end = 0;
3182         /*
3183          * A tidaw can address 4k of memory, but must not cross page boundaries
3184          * We can let the block layer handle this by setting
3185          * blk_queue_segment_boundary to page boundaries and
3186          * blk_max_segment_size to page size when setting up the request queue.
3187          * For write requests, a TIDAW must not cross track boundaries, because
3188          * we have to set the CBC flag on the last tidaw for each track.
3189          */
3190         if (rq_data_dir(req) == WRITE) {
3191                 new_track = 1;
3192                 recid = first_rec;
3193                 rq_for_each_segment(bv, req, iter) {
3194                         dst = page_address(bv.bv_page) + bv.bv_offset;
3195                         seg_len = bv.bv_len;
3196                         while (seg_len) {
3197                                 if (new_track) {
3198                                         trkid = recid;
3199                                         offs = sector_div(trkid, blk_per_trk);
3200                                         count_to_trk_end = blk_per_trk - offs;
3201                                         count = min((last_rec - recid + 1),
3202                                                     (sector_t)count_to_trk_end);
3203                                         len_to_track_end = count * blksize;
3204                                         recid += count;
3205                                         new_track = 0;
3206                                 }
3207                                 part_len = min(seg_len, len_to_track_end);
3208                                 seg_len -= part_len;
3209                                 len_to_track_end -= part_len;
3210                                 /* We need to end the tidaw at track end */
3211                                 if (!len_to_track_end) {
3212                                         new_track = 1;
3213                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3214                                 } else
3215                                         tidaw_flags = 0;
3216                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3217                                                             dst, part_len);
3218                                 if (IS_ERR(last_tidaw)) {
3219                                         ret = -EINVAL;
3220                                         goto out_error;
3221                                 }
3222                                 dst += part_len;
3223                         }
3224                 }
3225         } else {
3226                 rq_for_each_segment(bv, req, iter) {
3227                         dst = page_address(bv.bv_page) + bv.bv_offset;
3228                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3229                                                     dst, bv.bv_len);
3230                         if (IS_ERR(last_tidaw)) {
3231                                 ret = -EINVAL;
3232                                 goto out_error;
3233                         }
3234                 }
3235         }
3236         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3237         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3238         itcw_finalize(itcw);
3239
3240         if (blk_noretry_request(req) ||
3241             block->base->features & DASD_FEATURE_FAILFAST)
3242                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3243         cqr->cpmode = 1;
3244         cqr->startdev = startdev;
3245         cqr->memdev = startdev;
3246         cqr->block = block;
3247         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3248         cqr->lpm = startdev->path_data.ppm;
3249         cqr->retries = startdev->default_retries;
3250         cqr->buildclk = get_tod_clock();
3251         cqr->status = DASD_CQR_FILLED;
3252         return cqr;
3253 out_error:
3254         dasd_sfree_request(cqr, startdev);
3255         return ERR_PTR(ret);
3256 }
3257
3258 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3259                                                struct dasd_block *block,
3260                                                struct request *req)
3261 {
3262         int cmdrtd, cmdwtd;
3263         int use_prefix;
3264         int fcx_multitrack;
3265         struct dasd_eckd_private *private;
3266         struct dasd_device *basedev;
3267         sector_t first_rec, last_rec;
3268         sector_t first_trk, last_trk;
3269         unsigned int first_offs, last_offs;
3270         unsigned int blk_per_trk, blksize;
3271         int cdlspecial;
3272         unsigned int data_size;
3273         struct dasd_ccw_req *cqr;
3274
3275         basedev = block->base;
3276         private = (struct dasd_eckd_private *) basedev->private;
3277
3278         /* Calculate number of blocks/records per track. */
3279         blksize = block->bp_block;
3280         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3281         if (blk_per_trk == 0)
3282                 return ERR_PTR(-EINVAL);
3283         /* Calculate record id of first and last block. */
3284         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3285         first_offs = sector_div(first_trk, blk_per_trk);
3286         last_rec = last_trk =
3287                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3288         last_offs = sector_div(last_trk, blk_per_trk);
3289         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3290
3291         fcx_multitrack = private->features.feature[40] & 0x20;
3292         data_size = blk_rq_bytes(req);
3293         if (data_size % blksize)
3294                 return ERR_PTR(-EINVAL);
3295         /* tpm write request add CBC data on each track boundary */
3296         if (rq_data_dir(req) == WRITE)
3297                 data_size += (last_trk - first_trk) * 4;
3298
3299         /* is read track data and write track data in command mode supported? */
3300         cmdrtd = private->features.feature[9] & 0x20;
3301         cmdwtd = private->features.feature[12] & 0x40;
3302         use_prefix = private->features.feature[8] & 0x01;
3303
3304         cqr = NULL;
3305         if (cdlspecial || dasd_page_cache) {
3306                 /* do nothing, just fall through to the cmd mode single case */
3307         } else if ((data_size <= private->fcx_max_data)
3308                    && (fcx_multitrack || (first_trk == last_trk))) {
3309                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3310                                                     first_rec, last_rec,
3311                                                     first_trk, last_trk,
3312                                                     first_offs, last_offs,
3313                                                     blk_per_trk, blksize);
3314                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3315                     (PTR_ERR(cqr) != -ENOMEM))
3316                         cqr = NULL;
3317         } else if (use_prefix &&
3318                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3319                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3320                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3321                                                    first_rec, last_rec,
3322                                                    first_trk, last_trk,
3323                                                    first_offs, last_offs,
3324                                                    blk_per_trk, blksize);
3325                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3326                     (PTR_ERR(cqr) != -ENOMEM))
3327                         cqr = NULL;
3328         }
3329         if (!cqr)
3330                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3331                                                     first_rec, last_rec,
3332                                                     first_trk, last_trk,
3333                                                     first_offs, last_offs,
3334                                                     blk_per_trk, blksize);
3335         return cqr;
3336 }
3337
3338 static struct dasd_ccw_req *dasd_raw_build_cp(struct dasd_device *startdev,
3339                                                struct dasd_block *block,
3340                                                struct request *req)
3341 {
3342         unsigned long *idaws;
3343         struct dasd_device *basedev;
3344         struct dasd_ccw_req *cqr;
3345         struct ccw1 *ccw;
3346         struct req_iterator iter;
3347         struct bio_vec bv;
3348         char *dst;
3349         unsigned char cmd;
3350         unsigned int trkcount;
3351         unsigned int seg_len, len_to_track_end;
3352         unsigned int first_offs;
3353         unsigned int cidaw, cplength, datasize;
3354         sector_t first_trk, last_trk, sectors;
3355         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3356         unsigned int pfx_datasize;
3357
3358         /*
3359          * raw track access needs to be mutiple of 64k and on 64k boundary
3360          * For read requests we can fix an incorrect alignment by padding
3361          * the request with dummy pages.
3362          */
3363         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3364         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3365                 DASD_RAW_SECTORS_PER_TRACK;
3366         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3367                 DASD_RAW_SECTORS_PER_TRACK;
3368         basedev = block->base;
3369         if ((start_padding_sectors || end_padding_sectors) &&
3370             (rq_data_dir(req) == WRITE)) {
3371                 DBF_DEV_EVENT(DBF_ERR, basedev,
3372                               "raw write not track aligned (%lu,%lu) req %p",
3373                               start_padding_sectors, end_padding_sectors, req);
3374                 cqr = ERR_PTR(-EINVAL);
3375                 goto out;
3376         }
3377
3378         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3379         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3380                 DASD_RAW_SECTORS_PER_TRACK;
3381         trkcount = last_trk - first_trk + 1;
3382         first_offs = 0;
3383
3384         if (rq_data_dir(req) == READ)
3385                 cmd = DASD_ECKD_CCW_READ_TRACK;
3386         else if (rq_data_dir(req) == WRITE)
3387                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3388         else {
3389                 cqr = ERR_PTR(-EINVAL);
3390                 goto out;
3391         }
3392
3393         /*
3394          * Raw track based I/O needs IDAWs for each page,
3395          * and not just for 64 bit addresses.
3396          */
3397         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3398
3399         /* 1x prefix + one read/write ccw per track */
3400         cplength = 1 + trkcount;
3401
3402         /*
3403          * struct PFX_eckd_data has up to 2 byte as extended parameter
3404          * this is needed for write full track and has to be mentioned
3405          * separately
3406          * add 8 instead of 2 to keep 8 byte boundary
3407          */
3408         pfx_datasize = sizeof(struct PFX_eckd_data) + 8;
3409
3410         datasize = pfx_datasize + cidaw * sizeof(unsigned long long);
3411
3412         /* Allocate the ccw request. */
3413         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3414                                    datasize, startdev);
3415         if (IS_ERR(cqr))
3416                 goto out;
3417         ccw = cqr->cpaddr;
3418
3419         if (prefix_LRE(ccw++, cqr->data, first_trk, last_trk, cmd,
3420                        basedev, startdev, 1 /* format */, first_offs + 1,
3421                        trkcount, 0, 0) == -EAGAIN) {
3422                 /* Clock not in sync and XRC is enabled.
3423                  * Try again later.
3424                  */
3425                 dasd_sfree_request(cqr, startdev);
3426                 cqr = ERR_PTR(-EAGAIN);
3427                 goto out;
3428         }
3429
3430         idaws = (unsigned long *)(cqr->data + pfx_datasize);
3431         len_to_track_end = 0;
3432         if (start_padding_sectors) {
3433                 ccw[-1].flags |= CCW_FLAG_CC;
3434                 ccw->cmd_code = cmd;
3435                 /* maximum 3390 track size */
3436                 ccw->count = 57326;
3437                 /* 64k map to one track */
3438                 len_to_track_end = 65536 - start_padding_sectors * 512;
3439                 ccw->cda = (__u32)(addr_t)idaws;
3440                 ccw->flags |= CCW_FLAG_IDA;
3441                 ccw->flags |= CCW_FLAG_SLI;
3442                 ccw++;
3443                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3444                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3445         }
3446         rq_for_each_segment(bv, req, iter) {
3447                 dst = page_address(bv.bv_page) + bv.bv_offset;
3448                 seg_len = bv.bv_len;
3449                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3450                         memset(dst, 0, seg_len);
3451                 if (!len_to_track_end) {
3452                         ccw[-1].flags |= CCW_FLAG_CC;
3453                         ccw->cmd_code = cmd;
3454                         /* maximum 3390 track size */
3455                         ccw->count = 57326;
3456                         /* 64k map to one track */
3457                         len_to_track_end = 65536;
3458                         ccw->cda = (__u32)(addr_t)idaws;
3459                         ccw->flags |= CCW_FLAG_IDA;
3460                         ccw->flags |= CCW_FLAG_SLI;
3461                         ccw++;
3462                 }
3463                 len_to_track_end -= seg_len;
3464                 idaws = idal_create_words(idaws, dst, seg_len);
3465         }
3466         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3467                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3468         if (blk_noretry_request(req) ||
3469             block->base->features & DASD_FEATURE_FAILFAST)
3470                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3471         cqr->startdev = startdev;
3472         cqr->memdev = startdev;
3473         cqr->block = block;
3474         cqr->expires = startdev->default_expires * HZ;
3475         cqr->lpm = startdev->path_data.ppm;
3476         cqr->retries = startdev->default_retries;
3477         cqr->buildclk = get_tod_clock();
3478         cqr->status = DASD_CQR_FILLED;
3479
3480         if (IS_ERR(cqr) && PTR_ERR(cqr) != -EAGAIN)
3481                 cqr = NULL;
3482 out:
3483         return cqr;
3484 }
3485
3486
3487 static int
3488 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3489 {
3490         struct dasd_eckd_private *private;
3491         struct ccw1 *ccw;
3492         struct req_iterator iter;
3493         struct bio_vec bv;
3494         char *dst, *cda;
3495         unsigned int blksize, blk_per_trk, off;
3496         sector_t recid;
3497         int status;
3498
3499         if (!dasd_page_cache)
3500                 goto out;
3501         private = (struct dasd_eckd_private *) cqr->block->base->private;
3502         blksize = cqr->block->bp_block;
3503         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3504         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3505         ccw = cqr->cpaddr;
3506         /* Skip over define extent & locate record. */
3507         ccw++;
3508         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3509                 ccw++;
3510         rq_for_each_segment(bv, req, iter) {
3511                 dst = page_address(bv.bv_page) + bv.bv_offset;
3512                 for (off = 0; off < bv.bv_len; off += blksize) {
3513                         /* Skip locate record. */
3514                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3515                                 ccw++;
3516                         if (dst) {
3517                                 if (ccw->flags & CCW_FLAG_IDA)
3518                                         cda = *((char **)((addr_t) ccw->cda));
3519                                 else
3520                                         cda = (char *)((addr_t) ccw->cda);
3521                                 if (dst != cda) {
3522                                         if (rq_data_dir(req) == READ)
3523                                                 memcpy(dst, cda, bv.bv_len);
3524                                         kmem_cache_free(dasd_page_cache,
3525                                             (void *)((addr_t)cda & PAGE_MASK));
3526                                 }
3527                                 dst = NULL;
3528                         }
3529                         ccw++;
3530                         recid++;
3531                 }
3532         }
3533 out:
3534         status = cqr->status == DASD_CQR_DONE;
3535         dasd_sfree_request(cqr, cqr->memdev);
3536         return status;
3537 }
3538
3539 /*
3540  * Modify ccw/tcw in cqr so it can be started on a base device.
3541  *
3542  * Note that this is not enough to restart the cqr!
3543  * Either reset cqr->startdev as well (summary unit check handling)
3544  * or restart via separate cqr (as in ERP handling).
3545  */
3546 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3547 {
3548         struct ccw1 *ccw;
3549         struct PFX_eckd_data *pfxdata;
3550         struct tcw *tcw;
3551         struct tccb *tccb;
3552         struct dcw *dcw;
3553
3554         if (cqr->cpmode == 1) {
3555                 tcw = cqr->cpaddr;
3556                 tccb = tcw_get_tccb(tcw);
3557                 dcw = (struct dcw *)&tccb->tca[0];
3558                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
3559                 pfxdata->validity.verify_base = 0;
3560                 pfxdata->validity.hyper_pav = 0;
3561         } else {
3562                 ccw = cqr->cpaddr;
3563                 pfxdata = cqr->data;
3564                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
3565                         pfxdata->validity.verify_base = 0;
3566                         pfxdata->validity.hyper_pav = 0;
3567                 }
3568         }
3569 }
3570
3571 #define DASD_ECKD_CHANQ_MAX_SIZE 4
3572
3573 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
3574                                                      struct dasd_block *block,
3575                                                      struct request *req)
3576 {
3577         struct dasd_eckd_private *private;
3578         struct dasd_device *startdev;
3579         unsigned long flags;
3580         struct dasd_ccw_req *cqr;
3581
3582         startdev = dasd_alias_get_start_dev(base);
3583         if (!startdev)
3584                 startdev = base;
3585         private = (struct dasd_eckd_private *) startdev->private;
3586         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
3587                 return ERR_PTR(-EBUSY);
3588
3589         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
3590         private->count++;
3591         if ((base->features & DASD_FEATURE_USERAW))
3592                 cqr = dasd_raw_build_cp(startdev, block, req);
3593         else
3594                 cqr = dasd_eckd_build_cp(startdev, block, req);
3595         if (IS_ERR(cqr))
3596                 private->count--;
3597         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
3598         return cqr;
3599 }
3600
3601 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
3602                                    struct request *req)
3603 {
3604         struct dasd_eckd_private *private;
3605         unsigned long flags;
3606
3607         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
3608         private = (struct dasd_eckd_private *) cqr->memdev->private;
3609         private->count--;
3610         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
3611         return dasd_eckd_free_cp(cqr, req);
3612 }
3613
3614 static int
3615 dasd_eckd_fill_info(struct dasd_device * device,
3616                     struct dasd_information2_t * info)
3617 {
3618         struct dasd_eckd_private *private;
3619
3620         private = (struct dasd_eckd_private *) device->private;
3621         info->label_block = 2;
3622         info->FBA_layout = private->uses_cdl ? 0 : 1;
3623         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
3624         info->characteristics_size = sizeof(struct dasd_eckd_characteristics);
3625         memcpy(info->characteristics, &private->rdc_data,
3626                sizeof(struct dasd_eckd_characteristics));
3627         info->confdata_size = min((unsigned long)private->conf_len,
3628                                   sizeof(info->configuration_data));
3629         memcpy(info->configuration_data, private->conf_data,
3630                info->confdata_size);
3631         return 0;
3632 }
3633
3634 /*
3635  * SECTION: ioctl functions for eckd devices.
3636  */
3637
3638 /*
3639  * Release device ioctl.
3640  * Buils a channel programm to releases a prior reserved
3641  * (see dasd_eckd_reserve) device.
3642  */
3643 static int
3644 dasd_eckd_release(struct dasd_device *device)
3645 {
3646         struct dasd_ccw_req *cqr;
3647         int rc;
3648         struct ccw1 *ccw;
3649         int useglobal;
3650
3651         if (!capable(CAP_SYS_ADMIN))
3652                 return -EACCES;
3653
3654         useglobal = 0;
3655         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3656         if (IS_ERR(cqr)) {
3657                 mutex_lock(&dasd_reserve_mutex);
3658                 useglobal = 1;
3659                 cqr = &dasd_reserve_req->cqr;
3660                 memset(cqr, 0, sizeof(*cqr));
3661                 memset(&dasd_reserve_req->ccw, 0,
3662                        sizeof(dasd_reserve_req->ccw));
3663                 cqr->cpaddr = &dasd_reserve_req->ccw;
3664                 cqr->data = &dasd_reserve_req->data;
3665                 cqr->magic = DASD_ECKD_MAGIC;
3666         }
3667         ccw = cqr->cpaddr;
3668         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
3669         ccw->flags |= CCW_FLAG_SLI;
3670         ccw->count = 32;
3671         ccw->cda = (__u32)(addr_t) cqr->data;
3672         cqr->startdev = device;
3673         cqr->memdev = device;
3674         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3675         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3676         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3677         cqr->expires = 2 * HZ;
3678         cqr->buildclk = get_tod_clock();
3679         cqr->status = DASD_CQR_FILLED;
3680
3681         rc = dasd_sleep_on_immediatly(cqr);
3682         if (!rc)
3683                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3684
3685         if (useglobal)
3686                 mutex_unlock(&dasd_reserve_mutex);
3687         else
3688                 dasd_sfree_request(cqr, cqr->memdev);
3689         return rc;
3690 }
3691
3692 /*
3693  * Reserve device ioctl.
3694  * Options are set to 'synchronous wait for interrupt' and
3695  * 'timeout the request'. This leads to a terminate IO if
3696  * the interrupt is outstanding for a certain time.
3697  */
3698 static int
3699 dasd_eckd_reserve(struct dasd_device *device)
3700 {
3701         struct dasd_ccw_req *cqr;
3702         int rc;
3703         struct ccw1 *ccw;
3704         int useglobal;
3705
3706         if (!capable(CAP_SYS_ADMIN))
3707                 return -EACCES;
3708
3709         useglobal = 0;
3710         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3711         if (IS_ERR(cqr)) {
3712                 mutex_lock(&dasd_reserve_mutex);
3713                 useglobal = 1;
3714                 cqr = &dasd_reserve_req->cqr;
3715                 memset(cqr, 0, sizeof(*cqr));
3716                 memset(&dasd_reserve_req->ccw, 0,
3717                        sizeof(dasd_reserve_req->ccw));
3718                 cqr->cpaddr = &dasd_reserve_req->ccw;
3719                 cqr->data = &dasd_reserve_req->data;
3720                 cqr->magic = DASD_ECKD_MAGIC;
3721         }
3722         ccw = cqr->cpaddr;
3723         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
3724         ccw->flags |= CCW_FLAG_SLI;
3725         ccw->count = 32;
3726         ccw->cda = (__u32)(addr_t) cqr->data;
3727         cqr->startdev = device;
3728         cqr->memdev = device;
3729         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3730         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3731         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3732         cqr->expires = 2 * HZ;
3733         cqr->buildclk = get_tod_clock();
3734         cqr->status = DASD_CQR_FILLED;
3735
3736         rc = dasd_sleep_on_immediatly(cqr);
3737         if (!rc)
3738                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3739
3740         if (useglobal)
3741                 mutex_unlock(&dasd_reserve_mutex);
3742         else
3743                 dasd_sfree_request(cqr, cqr->memdev);
3744         return rc;
3745 }
3746
3747 /*
3748  * Steal lock ioctl - unconditional reserve device.
3749  * Buils a channel programm to break a device's reservation.
3750  * (unconditional reserve)
3751  */
3752 static int
3753 dasd_eckd_steal_lock(struct dasd_device *device)
3754 {
3755         struct dasd_ccw_req *cqr;
3756         int rc;
3757         struct ccw1 *ccw;
3758         int useglobal;
3759
3760         if (!capable(CAP_SYS_ADMIN))
3761                 return -EACCES;
3762
3763         useglobal = 0;
3764         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
3765         if (IS_ERR(cqr)) {
3766                 mutex_lock(&dasd_reserve_mutex);
3767                 useglobal = 1;
3768                 cqr = &dasd_reserve_req->cqr;
3769                 memset(cqr, 0, sizeof(*cqr));
3770                 memset(&dasd_reserve_req->ccw, 0,
3771                        sizeof(dasd_reserve_req->ccw));
3772                 cqr->cpaddr = &dasd_reserve_req->ccw;
3773                 cqr->data = &dasd_reserve_req->data;
3774                 cqr->magic = DASD_ECKD_MAGIC;
3775         }
3776         ccw = cqr->cpaddr;
3777         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
3778         ccw->flags |= CCW_FLAG_SLI;
3779         ccw->count = 32;
3780         ccw->cda = (__u32)(addr_t) cqr->data;
3781         cqr->startdev = device;
3782         cqr->memdev = device;
3783         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3784         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3785         cqr->retries = 2;       /* set retry counter to enable basic ERP */
3786         cqr->expires = 2 * HZ;
3787         cqr->buildclk = get_tod_clock();
3788         cqr->status = DASD_CQR_FILLED;
3789
3790         rc = dasd_sleep_on_immediatly(cqr);
3791         if (!rc)
3792                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3793
3794         if (useglobal)
3795                 mutex_unlock(&dasd_reserve_mutex);
3796         else
3797                 dasd_sfree_request(cqr, cqr->memdev);
3798         return rc;
3799 }
3800
3801 /*
3802  * SNID - Sense Path Group ID
3803  * This ioctl may be used in situations where I/O is stalled due to
3804  * a reserve, so if the normal dasd_smalloc_request fails, we use the
3805  * preallocated dasd_reserve_req.
3806  */
3807 static int dasd_eckd_snid(struct dasd_device *device,
3808                           void __user *argp)
3809 {
3810         struct dasd_ccw_req *cqr;
3811         int rc;
3812         struct ccw1 *ccw;
3813         int useglobal;
3814         struct dasd_snid_ioctl_data usrparm;
3815
3816         if (!capable(CAP_SYS_ADMIN))
3817                 return -EACCES;
3818
3819         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
3820                 return -EFAULT;
3821
3822         useglobal = 0;
3823         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
3824                                    sizeof(struct dasd_snid_data), device);
3825         if (IS_ERR(cqr)) {
3826                 mutex_lock(&dasd_reserve_mutex);
3827                 useglobal = 1;
3828                 cqr = &dasd_reserve_req->cqr;
3829                 memset(cqr, 0, sizeof(*cqr));
3830                 memset(&dasd_reserve_req->ccw, 0,
3831                        sizeof(dasd_reserve_req->ccw));
3832                 cqr->cpaddr = &dasd_reserve_req->ccw;
3833                 cqr->data = &dasd_reserve_req->data;
3834                 cqr->magic = DASD_ECKD_MAGIC;
3835         }
3836         ccw = cqr->cpaddr;
3837         ccw->cmd_code = DASD_ECKD_CCW_SNID;
3838         ccw->flags |= CCW_FLAG_SLI;
3839         ccw->count = 12;
3840         ccw->cda = (__u32)(addr_t) cqr->data;
3841         cqr->startdev = device;
3842         cqr->memdev = device;
3843         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3844         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3845         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
3846         cqr->retries = 5;
3847         cqr->expires = 10 * HZ;
3848         cqr->buildclk = get_tod_clock();
3849         cqr->status = DASD_CQR_FILLED;
3850         cqr->lpm = usrparm.path_mask;
3851
3852         rc = dasd_sleep_on_immediatly(cqr);
3853         /* verify that I/O processing didn't modify the path mask */
3854         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
3855                 rc = -EIO;
3856         if (!rc) {
3857                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
3858                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
3859                         rc = -EFAULT;
3860         }
3861
3862         if (useglobal)
3863                 mutex_unlock(&dasd_reserve_mutex);
3864         else
3865                 dasd_sfree_request(cqr, cqr->memdev);
3866         return rc;
3867 }
3868
3869 /*
3870  * Read performance statistics
3871  */
3872 static int
3873 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
3874 {
3875         struct dasd_psf_prssd_data *prssdp;
3876         struct dasd_rssd_perf_stats_t *stats;
3877         struct dasd_ccw_req *cqr;
3878         struct ccw1 *ccw;
3879         int rc;
3880
3881         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
3882                                    (sizeof(struct dasd_psf_prssd_data) +
3883                                     sizeof(struct dasd_rssd_perf_stats_t)),
3884                                    device);
3885         if (IS_ERR(cqr)) {
3886                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
3887                             "Could not allocate initialization request");
3888                 return PTR_ERR(cqr);
3889         }
3890         cqr->startdev = device;
3891         cqr->memdev = device;
3892         cqr->retries = 0;
3893         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
3894         cqr->expires = 10 * HZ;
3895
3896         /* Prepare for Read Subsystem Data */
3897         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3898         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
3899         prssdp->order = PSF_ORDER_PRSSD;
3900         prssdp->suborder = 0x01;        /* Performance Statistics */
3901         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
3902
3903         ccw = cqr->cpaddr;
3904         ccw->cmd_code = DASD_ECKD_CCW_PSF;
3905         ccw->count = sizeof(struct dasd_psf_prssd_data);
3906         ccw->flags |= CCW_FLAG_CC;
3907         ccw->cda = (__u32)(addr_t) prssdp;
3908
3909         /* Read Subsystem Data - Performance Statistics */
3910         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3911         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
3912
3913         ccw++;
3914         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
3915         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
3916         ccw->cda = (__u32)(addr_t) stats;
3917
3918         cqr->buildclk = get_tod_clock();
3919         cqr->status = DASD_CQR_FILLED;
3920         rc = dasd_sleep_on(cqr);
3921         if (rc == 0) {
3922                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
3923                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
3924                 if (copy_to_user(argp, stats,
3925                                  sizeof(struct dasd_rssd_perf_stats_t)))
3926                         rc = -EFAULT;
3927         }
3928         dasd_sfree_request(cqr, cqr->memdev);
3929         return rc;
3930 }
3931
3932 /*
3933  * Get attributes (cache operations)
3934  * Returnes the cache attributes used in Define Extend (DE).
3935  */
3936 static int
3937 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
3938 {
3939         struct dasd_eckd_private *private =
3940                 (struct dasd_eckd_private *)device->private;
3941         struct attrib_data_t attrib = private->attrib;
3942         int rc;
3943
3944         if (!capable(CAP_SYS_ADMIN))
3945                 return -EACCES;
3946         if (!argp)
3947                 return -EINVAL;
3948
3949         rc = 0;
3950         if (copy_to_user(argp, (long *) &attrib,
3951                          sizeof(struct attrib_data_t)))
3952                 rc = -EFAULT;
3953
3954         return rc;
3955 }
3956
3957 /*
3958  * Set attributes (cache operations)
3959  * Stores the attributes for cache operation to be used in Define Extend (DE).
3960  */
3961 static int
3962 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
3963 {
3964         struct dasd_eckd_private *private =
3965                 (struct dasd_eckd_private *)device->private;
3966         struct attrib_data_t attrib;
3967
3968         if (!capable(CAP_SYS_ADMIN))
3969                 return -EACCES;
3970         if (!argp)
3971                 return -EINVAL;
3972
3973         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
3974                 return -EFAULT;
3975         private->attrib = attrib;
3976
3977         dev_info(&device->cdev->dev,
3978                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
3979                  private->attrib.operation, private->attrib.nr_cyl);
3980         return 0;
3981 }
3982
3983 /*
3984  * Issue syscall I/O to EMC Symmetrix array.
3985  * CCWs are PSF and RSSD
3986  */
3987 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
3988 {
3989         struct dasd_symmio_parms usrparm;
3990         char *psf_data, *rssd_result;
3991         struct dasd_ccw_req *cqr;
3992         struct ccw1 *ccw;
3993         char psf0, psf1;
3994         int rc;
3995
3996         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
3997                 return -EACCES;
3998         psf0 = psf1 = 0;
3999
4000         /* Copy parms from caller */
4001         rc = -EFAULT;
4002         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4003                 goto out;
4004         if (is_compat_task()) {
4005                 /* Make sure pointers are sane even on 31 bit. */
4006                 rc = -EINVAL;
4007                 if ((usrparm.psf_data >> 32) != 0)
4008                         goto out;
4009                 if ((usrparm.rssd_result >> 32) != 0)
4010                         goto out;
4011                 usrparm.psf_data &= 0x7fffffffULL;
4012                 usrparm.rssd_result &= 0x7fffffffULL;
4013         }
4014         /* alloc I/O data area */
4015         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4016         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4017         if (!psf_data || !rssd_result) {
4018                 rc = -ENOMEM;
4019                 goto out_free;
4020         }
4021
4022         /* get syscall header from user space */
4023         rc = -EFAULT;
4024         if (copy_from_user(psf_data,
4025                            (void __user *)(unsigned long) usrparm.psf_data,
4026                            usrparm.psf_data_len))
4027                 goto out_free;
4028         psf0 = psf_data[0];
4029         psf1 = psf_data[1];
4030
4031         /* setup CCWs for PSF + RSSD */
4032         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4033         if (IS_ERR(cqr)) {
4034                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4035                         "Could not allocate initialization request");
4036                 rc = PTR_ERR(cqr);
4037                 goto out_free;
4038         }
4039
4040         cqr->startdev = device;
4041         cqr->memdev = device;
4042         cqr->retries = 3;
4043         cqr->expires = 10 * HZ;
4044         cqr->buildclk = get_tod_clock();
4045         cqr->status = DASD_CQR_FILLED;
4046
4047         /* Build the ccws */
4048         ccw = cqr->cpaddr;
4049
4050         /* PSF ccw */
4051         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4052         ccw->count = usrparm.psf_data_len;
4053         ccw->flags |= CCW_FLAG_CC;
4054         ccw->cda = (__u32)(addr_t) psf_data;
4055
4056         ccw++;
4057
4058         /* RSSD ccw  */
4059         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4060         ccw->count = usrparm.rssd_result_len;
4061         ccw->flags = CCW_FLAG_SLI ;
4062         ccw->cda = (__u32)(addr_t) rssd_result;
4063
4064         rc = dasd_sleep_on(cqr);
4065         if (rc)
4066                 goto out_sfree;
4067
4068         rc = -EFAULT;
4069         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4070                            rssd_result, usrparm.rssd_result_len))
4071                 goto out_sfree;
4072         rc = 0;
4073
4074 out_sfree:
4075         dasd_sfree_request(cqr, cqr->memdev);
4076 out_free:
4077         kfree(rssd_result);
4078         kfree(psf_data);
4079 out:
4080         DBF_DEV_EVENT(DBF_WARNING, device,
4081                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4082                       (int) psf0, (int) psf1, rc);
4083         return rc;
4084 }
4085
4086 static int
4087 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4088 {
4089         struct dasd_device *device = block->base;
4090
4091         switch (cmd) {
4092         case BIODASDGATTR:
4093                 return dasd_eckd_get_attrib(device, argp);
4094         case BIODASDSATTR:
4095                 return dasd_eckd_set_attrib(device, argp);
4096         case BIODASDPSRD:
4097                 return dasd_eckd_performance(device, argp);
4098         case BIODASDRLSE:
4099                 return dasd_eckd_release(device);
4100         case BIODASDRSRV:
4101                 return dasd_eckd_reserve(device);
4102         case BIODASDSLCK:
4103                 return dasd_eckd_steal_lock(device);
4104         case BIODASDSNID:
4105                 return dasd_eckd_snid(device, argp);
4106         case BIODASDSYMMIO:
4107                 return dasd_symm_io(device, argp);
4108         default:
4109                 return -ENOTTY;
4110         }
4111 }
4112
4113 /*
4114  * Dump the range of CCWs into 'page' buffer
4115  * and return number of printed chars.
4116  */
4117 static int
4118 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4119 {
4120         int len, count;
4121         char *datap;
4122
4123         len = 0;
4124         while (from <= to) {
4125                 len += sprintf(page + len, PRINTK_HEADER
4126                                " CCW %p: %08X %08X DAT:",
4127                                from, ((int *) from)[0], ((int *) from)[1]);
4128
4129                 /* get pointer to data (consider IDALs) */
4130                 if (from->flags & CCW_FLAG_IDA)
4131                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4132                 else
4133                         datap = (char *) ((addr_t) from->cda);
4134
4135                 /* dump data (max 32 bytes) */
4136                 for (count = 0; count < from->count && count < 32; count++) {
4137                         if (count % 8 == 0) len += sprintf(page + len, " ");
4138                         if (count % 4 == 0) len += sprintf(page + len, " ");
4139                         len += sprintf(page + len, "%02x", datap[count]);
4140                 }
4141                 len += sprintf(page + len, "\n");
4142                 from++;
4143         }
4144         return len;
4145 }
4146
4147 static void
4148 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4149                          char *reason)
4150 {
4151         u64 *sense;
4152         u64 *stat;
4153
4154         sense = (u64 *) dasd_get_sense(irb);
4155         stat = (u64 *) &irb->scsw;
4156         if (sense) {
4157                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4158                               "%016llx %016llx %016llx %016llx",
4159                               reason, *stat, *((u32 *) (stat + 1)),
4160                               sense[0], sense[1], sense[2], sense[3]);
4161         } else {
4162                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4163                               reason, *stat, *((u32 *) (stat + 1)),
4164                               "NO VALID SENSE");
4165         }
4166 }
4167
4168 /*
4169  * Print sense data and related channel program.
4170  * Parts are printed because printk buffer is only 1024 bytes.
4171  */
4172 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4173                                  struct dasd_ccw_req *req, struct irb *irb)
4174 {
4175         char *page;
4176         struct ccw1 *first, *last, *fail, *from, *to;
4177         int len, sl, sct;
4178
4179         page = (char *) get_zeroed_page(GFP_ATOMIC);
4180         if (page == NULL) {
4181                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4182                               "No memory to dump sense data\n");
4183                 return;
4184         }
4185         /* dump the sense data */
4186         len = sprintf(page, PRINTK_HEADER
4187                       " I/O status report for device %s:\n",
4188                       dev_name(&device->cdev->dev));
4189         len += sprintf(page + len, PRINTK_HEADER
4190                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4191                        "CS:%02X RC:%d\n",
4192                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4193                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4194                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4195                        req ? req->intrc : 0);
4196         len += sprintf(page + len, PRINTK_HEADER
4197                        " device %s: Failing CCW: %p\n",
4198                        dev_name(&device->cdev->dev),
4199                        (void *) (addr_t) irb->scsw.cmd.cpa);
4200         if (irb->esw.esw0.erw.cons) {
4201                 for (sl = 0; sl < 4; sl++) {
4202                         len += sprintf(page + len, PRINTK_HEADER
4203                                        " Sense(hex) %2d-%2d:",
4204                                        (8 * sl), ((8 * sl) + 7));
4205
4206                         for (sct = 0; sct < 8; sct++) {
4207                                 len += sprintf(page + len, " %02x",
4208                                                irb->ecw[8 * sl + sct]);
4209                         }
4210                         len += sprintf(page + len, "\n");
4211                 }
4212
4213                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4214                         /* 24 Byte Sense Data */
4215                         sprintf(page + len, PRINTK_HEADER
4216                                 " 24 Byte: %x MSG %x, "
4217                                 "%s MSGb to SYSOP\n",
4218                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4219                                 irb->ecw[1] & 0x10 ? "" : "no");
4220                 } else {
4221                         /* 32 Byte Sense Data */
4222                         sprintf(page + len, PRINTK_HEADER
4223                                 " 32 Byte: Format: %x "
4224                                 "Exception class %x\n",
4225                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4226                 }
4227         } else {
4228                 sprintf(page + len, PRINTK_HEADER
4229                         " SORRY - NO VALID SENSE AVAILABLE\n");
4230         }
4231         printk(KERN_ERR "%s", page);
4232
4233         if (req) {
4234                 /* req == NULL for unsolicited interrupts */
4235                 /* dump the Channel Program (max 140 Bytes per line) */
4236                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4237                 first = req->cpaddr;
4238                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4239                 to = min(first + 6, last);
4240                 len = sprintf(page, PRINTK_HEADER
4241                               " Related CP in req: %p\n", req);
4242                 dasd_eckd_dump_ccw_range(first, to, page + len);
4243                 printk(KERN_ERR "%s", page);
4244
4245                 /* print failing CCW area (maximum 4) */
4246                 /* scsw->cda is either valid or zero  */
4247                 len = 0;
4248                 from = ++to;
4249                 fail = (struct ccw1 *)(addr_t)
4250                                 irb->scsw.cmd.cpa; /* failing CCW */
4251                 if (from <  fail - 2) {
4252                         from = fail - 2;     /* there is a gap - print header */
4253                         len += sprintf(page, PRINTK_HEADER "......\n");
4254                 }
4255                 to = min(fail + 1, last);
4256                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4257
4258                 /* print last CCWs (maximum 2) */
4259                 from = max(from, ++to);
4260                 if (from < last - 1) {
4261                         from = last - 1;     /* there is a gap - print header */
4262                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4263                 }
4264                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4265                 if (len > 0)
4266                         printk(KERN_ERR "%s", page);
4267         }
4268         free_page((unsigned long) page);
4269 }
4270
4271
4272 /*
4273  * Print sense data from a tcw.
4274  */
4275 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4276                                  struct dasd_ccw_req *req, struct irb *irb)
4277 {
4278         char *page;
4279         int len, sl, sct, residual;
4280         struct tsb *tsb;
4281         u8 *sense, *rcq;
4282
4283         page = (char *) get_zeroed_page(GFP_ATOMIC);
4284         if (page == NULL) {
4285                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4286                             "No memory to dump sense data");
4287                 return;
4288         }
4289         /* dump the sense data */
4290         len = sprintf(page, PRINTK_HEADER
4291                       " I/O status report for device %s:\n",
4292                       dev_name(&device->cdev->dev));
4293         len += sprintf(page + len, PRINTK_HEADER
4294                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4295                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4296                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4297                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4298                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4299                        irb->scsw.tm.fcxs, irb->scsw.tm.schxs,
4300                        req ? req->intrc : 0);
4301         len += sprintf(page + len, PRINTK_HEADER
4302                        " device %s: Failing TCW: %p\n",
4303                        dev_name(&device->cdev->dev),
4304                        (void *) (addr_t) irb->scsw.tm.tcw);
4305
4306         tsb = NULL;
4307         sense = NULL;
4308         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4309                 tsb = tcw_get_tsb(
4310                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4311
4312         if (tsb) {
4313                 len += sprintf(page + len, PRINTK_HEADER
4314                                " tsb->length %d\n", tsb->length);
4315                 len += sprintf(page + len, PRINTK_HEADER
4316                                " tsb->flags %x\n", tsb->flags);
4317                 len += sprintf(page + len, PRINTK_HEADER
4318                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4319                 len += sprintf(page + len, PRINTK_HEADER
4320                                " tsb->count %d\n", tsb->count);
4321                 residual = tsb->count - 28;
4322                 len += sprintf(page + len, PRINTK_HEADER
4323                                " residual %d\n", residual);
4324
4325                 switch (tsb->flags & 0x07) {
4326                 case 1: /* tsa_iostat */
4327                         len += sprintf(page + len, PRINTK_HEADER
4328                                " tsb->tsa.iostat.dev_time %d\n",
4329                                        tsb->tsa.iostat.dev_time);
4330                         len += sprintf(page + len, PRINTK_HEADER
4331                                " tsb->tsa.iostat.def_time %d\n",
4332                                        tsb->tsa.iostat.def_time);
4333                         len += sprintf(page + len, PRINTK_HEADER
4334                                " tsb->tsa.iostat.queue_time %d\n",
4335                                        tsb->tsa.iostat.queue_time);
4336                         len += sprintf(page + len, PRINTK_HEADER
4337                                " tsb->tsa.iostat.dev_busy_time %d\n",
4338                                        tsb->tsa.iostat.dev_busy_time);
4339                         len += sprintf(page + len, PRINTK_HEADER
4340                                " tsb->tsa.iostat.dev_act_time %d\n",
4341                                        tsb->tsa.iostat.dev_act_time);
4342                         sense = tsb->tsa.iostat.sense;
4343                         break;
4344                 case 2: /* ts_ddpc */
4345                         len += sprintf(page + len, PRINTK_HEADER
4346                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4347                         for (sl = 0; sl < 2; sl++) {
4348                                 len += sprintf(page + len, PRINTK_HEADER
4349                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4350                                                (8 * sl), ((8 * sl) + 7));
4351                                 rcq = tsb->tsa.ddpc.rcq;
4352                                 for (sct = 0; sct < 8; sct++) {
4353                                         len += sprintf(page + len, " %02x",
4354                                                        rcq[8 * sl + sct]);
4355                                 }
4356                                 len += sprintf(page + len, "\n");
4357                         }
4358                         sense = tsb->tsa.ddpc.sense;
4359                         break;
4360                 case 3: /* tsa_intrg */
4361                         len += sprintf(page + len, PRINTK_HEADER
4362                                       " tsb->tsa.intrg.: not supportet yet\n");
4363                         break;
4364                 }
4365
4366                 if (sense) {
4367                         for (sl = 0; sl < 4; sl++) {
4368                                 len += sprintf(page + len, PRINTK_HEADER
4369                                                " Sense(hex) %2d-%2d:",
4370                                                (8 * sl), ((8 * sl) + 7));
4371                                 for (sct = 0; sct < 8; sct++) {
4372                                         len += sprintf(page + len, " %02x",
4373                                                        sense[8 * sl + sct]);
4374                                 }
4375                                 len += sprintf(page + len, "\n");
4376                         }
4377
4378                         if (sense[27] & DASD_SENSE_BIT_0) {
4379                                 /* 24 Byte Sense Data */
4380                                 sprintf(page + len, PRINTK_HEADER
4381                                         " 24 Byte: %x MSG %x, "
4382                                         "%s MSGb to SYSOP\n",
4383                                         sense[7] >> 4, sense[7] & 0x0f,
4384                                         sense[1] & 0x10 ? "" : "no");
4385                         } else {
4386                                 /* 32 Byte Sense Data */
4387                                 sprintf(page + len, PRINTK_HEADER
4388                                         " 32 Byte: Format: %x "
4389                                         "Exception class %x\n",
4390                                         sense[6] & 0x0f, sense[22] >> 4);
4391                         }
4392                 } else {
4393                         sprintf(page + len, PRINTK_HEADER
4394                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4395                 }
4396         } else {
4397                 sprintf(page + len, PRINTK_HEADER
4398                         " SORRY - NO TSB DATA AVAILABLE\n");
4399         }
4400         printk(KERN_ERR "%s", page);
4401         free_page((unsigned long) page);
4402 }
4403
4404 static void dasd_eckd_dump_sense(struct dasd_device *device,
4405                                  struct dasd_ccw_req *req, struct irb *irb)
4406 {
4407         if (scsw_is_tm(&irb->scsw))
4408                 dasd_eckd_dump_sense_tcw(device, req, irb);
4409         else
4410                 dasd_eckd_dump_sense_ccw(device, req, irb);
4411 }
4412
4413 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4414 {
4415         /*
4416          * the device should be disconnected from our LCU structure
4417          * on restore we will reconnect it and reread LCU specific
4418          * information like PAV support that might have changed
4419          */
4420         dasd_alias_remove_device(device);
4421         dasd_alias_disconnect_device_from_lcu(device);
4422
4423         return 0;
4424 }
4425
4426 static int dasd_eckd_restore_device(struct dasd_device *device)
4427 {
4428         struct dasd_eckd_private *private;
4429         struct dasd_eckd_characteristics temp_rdc_data;
4430         int rc;
4431         struct dasd_uid temp_uid;
4432         unsigned long flags;
4433         unsigned long cqr_flags = 0;
4434
4435         private = (struct dasd_eckd_private *) device->private;
4436
4437         /* Read Configuration Data */
4438         rc = dasd_eckd_read_conf(device);
4439         if (rc) {
4440                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4441                                 "Read configuration data failed, rc=%d", rc);
4442                 goto out_err;
4443         }
4444
4445         dasd_eckd_get_uid(device, &temp_uid);
4446         /* Generate device unique id */
4447         rc = dasd_eckd_generate_uid(device);
4448         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4449         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4450                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4451                         "changed\n");
4452         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4453         if (rc)
4454                 goto out_err;
4455
4456         /* register lcu with alias handling, enable PAV if this is a new lcu */
4457         rc = dasd_alias_make_device_known_to_lcu(device);
4458         if (rc)
4459                 goto out_err;
4460
4461         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4462         dasd_eckd_validate_server(device, cqr_flags);
4463
4464         /* RE-Read Configuration Data */
4465         rc = dasd_eckd_read_conf(device);
4466         if (rc) {
4467                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4468                         "Read configuration data failed, rc=%d", rc);
4469                 goto out_err2;
4470         }
4471
4472         /* Read Feature Codes */
4473         dasd_eckd_read_features(device);
4474
4475         /* Read Device Characteristics */
4476         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4477                                          &temp_rdc_data, 64);
4478         if (rc) {
4479                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4480                                 "Read device characteristic failed, rc=%d", rc);
4481                 goto out_err2;
4482         }
4483         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4484         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4485         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4486
4487         /* add device to alias management */
4488         dasd_alias_add_device(device);
4489
4490         return 0;
4491
4492 out_err2:
4493         dasd_alias_disconnect_device_from_lcu(device);
4494 out_err:
4495         return -1;
4496 }
4497
4498 static int dasd_eckd_reload_device(struct dasd_device *device)
4499 {
4500         struct dasd_eckd_private *private;
4501         int rc, old_base;
4502         char print_uid[60];
4503         struct dasd_uid uid;
4504         unsigned long flags;
4505
4506         private = (struct dasd_eckd_private *) device->private;
4507
4508         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4509         old_base = private->uid.base_unit_addr;
4510         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4511
4512         /* Read Configuration Data */
4513         rc = dasd_eckd_read_conf(device);
4514         if (rc)
4515                 goto out_err;
4516
4517         rc = dasd_eckd_generate_uid(device);
4518         if (rc)
4519                 goto out_err;
4520         /*
4521          * update unit address configuration and
4522          * add device to alias management
4523          */
4524         dasd_alias_update_add_device(device);
4525
4526         dasd_eckd_get_uid(device, &uid);
4527
4528         if (old_base != uid.base_unit_addr) {
4529                 if (strlen(uid.vduit) > 0)
4530                         snprintf(print_uid, sizeof(print_uid),
4531                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
4532                                  uid.ssid, uid.base_unit_addr, uid.vduit);
4533                 else
4534                         snprintf(print_uid, sizeof(print_uid),
4535                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
4536                                  uid.ssid, uid.base_unit_addr);
4537
4538                 dev_info(&device->cdev->dev,
4539                          "An Alias device was reassigned to a new base device "
4540                          "with UID: %s\n", print_uid);
4541         }
4542         return 0;
4543
4544 out_err:
4545         return -1;
4546 }
4547
4548 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
4549                                          struct dasd_rssd_messages *messages,
4550                                          __u8 lpum)
4551 {
4552         struct dasd_rssd_messages *message_buf;
4553         struct dasd_psf_prssd_data *prssdp;
4554         struct dasd_eckd_private *private;
4555         struct dasd_ccw_req *cqr;
4556         struct ccw1 *ccw;
4557         int rc;
4558
4559         private = (struct dasd_eckd_private *) device->private;
4560         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
4561                                    (sizeof(struct dasd_psf_prssd_data) +
4562                                     sizeof(struct dasd_rssd_messages)),
4563                                    device);
4564         if (IS_ERR(cqr)) {
4565                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
4566                                 "Could not allocate read message buffer request");
4567                 return PTR_ERR(cqr);
4568         }
4569
4570         cqr->startdev = device;
4571         cqr->memdev = device;
4572         cqr->block = NULL;
4573         cqr->expires = 10 * HZ;
4574         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4575         /* dasd_sleep_on_immediatly does not do complex error
4576          * recovery so clear erp flag and set retry counter to
4577          * do basic erp */
4578         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4579         cqr->retries = 256;
4580
4581         /* Prepare for Read Subsystem Data */
4582         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4583         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4584         prssdp->order = PSF_ORDER_PRSSD;
4585         prssdp->suborder = 0x03;        /* Message Buffer */
4586         /* all other bytes of prssdp must be zero */
4587
4588         ccw = cqr->cpaddr;
4589         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4590         ccw->count = sizeof(struct dasd_psf_prssd_data);
4591         ccw->flags |= CCW_FLAG_CC;
4592         ccw->flags |= CCW_FLAG_SLI;
4593         ccw->cda = (__u32)(addr_t) prssdp;
4594
4595         /* Read Subsystem Data - message buffer */
4596         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
4597         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
4598
4599         ccw++;
4600         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4601         ccw->count = sizeof(struct dasd_rssd_messages);
4602         ccw->flags |= CCW_FLAG_SLI;
4603         ccw->cda = (__u32)(addr_t) message_buf;
4604
4605         cqr->buildclk = get_tod_clock();
4606         cqr->status = DASD_CQR_FILLED;
4607         rc = dasd_sleep_on_immediatly(cqr);
4608         if (rc == 0) {
4609                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4610                 message_buf = (struct dasd_rssd_messages *)
4611                         (prssdp + 1);
4612                 memcpy(messages, message_buf,
4613                        sizeof(struct dasd_rssd_messages));
4614         } else
4615                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4616                                 "Reading messages failed with rc=%d\n"
4617                                 , rc);
4618         dasd_sfree_request(cqr, cqr->memdev);
4619         return rc;
4620 }
4621
4622 /*
4623  * Perform Subsystem Function - CUIR response
4624  */
4625 static int
4626 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
4627                             __u32 message_id,
4628                             struct channel_path_desc *desc,
4629                             struct subchannel_id sch_id)
4630 {
4631         struct dasd_psf_cuir_response *psf_cuir;
4632         struct dasd_ccw_req *cqr;
4633         struct ccw1 *ccw;
4634         int rc;
4635
4636         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
4637                                   sizeof(struct dasd_psf_cuir_response),
4638                                   device);
4639
4640         if (IS_ERR(cqr)) {
4641                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4642                            "Could not allocate PSF-CUIR request");
4643                 return PTR_ERR(cqr);
4644         }
4645
4646         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
4647         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
4648         psf_cuir->cc = response;
4649         if (desc)
4650                 psf_cuir->chpid = desc->chpid;
4651         psf_cuir->message_id = message_id;
4652         psf_cuir->cssid = sch_id.cssid;
4653         psf_cuir->ssid = sch_id.ssid;
4654         ccw = cqr->cpaddr;
4655         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4656         ccw->cda = (__u32)(addr_t)psf_cuir;
4657         ccw->flags = CCW_FLAG_SLI;
4658         ccw->count = sizeof(struct dasd_psf_cuir_response);
4659
4660         cqr->startdev = device;
4661         cqr->memdev = device;
4662         cqr->block = NULL;
4663         cqr->retries = 256;
4664         cqr->expires = 10*HZ;
4665         cqr->buildclk = get_tod_clock();
4666         cqr->status = DASD_CQR_FILLED;
4667         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
4668
4669         rc = dasd_sleep_on(cqr);
4670
4671         dasd_sfree_request(cqr, cqr->memdev);
4672         return rc;
4673 }
4674
4675 /*
4676  * return configuration data that is referenced by record selector
4677  * if a record selector is specified or per default return the
4678  * conf_data pointer for the path specified by lpum
4679  */
4680 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
4681                                                      __u8 lpum,
4682                                                      struct dasd_cuir_message *cuir)
4683 {
4684         struct dasd_eckd_private *private;
4685         struct dasd_conf_data *conf_data;
4686         int path, pos;
4687
4688         private = (struct dasd_eckd_private *) device->private;
4689         if (cuir->record_selector == 0)
4690                 goto out;
4691         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
4692                 conf_data = private->path_conf_data[pos];
4693                 if (conf_data->gneq.record_selector ==
4694                     cuir->record_selector)
4695                         return conf_data;
4696         }
4697 out:
4698         return private->path_conf_data[pathmask_to_pos(lpum)];
4699 }
4700
4701 /*
4702  * This function determines the scope of a reconfiguration request by
4703  * analysing the path and device selection data provided in the CUIR request.
4704  * Returns a path mask containing CUIR affected paths for the give device.
4705  *
4706  * If the CUIR request does not contain the required information return the
4707  * path mask of the path the attention message for the CUIR request was reveived
4708  * on.
4709  */
4710 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
4711                                 struct dasd_cuir_message *cuir)
4712 {
4713         struct dasd_conf_data *ref_conf_data;
4714         unsigned long bitmask = 0, mask = 0;
4715         struct dasd_eckd_private *private;
4716         struct dasd_conf_data *conf_data;
4717         unsigned int pos, path;
4718         char *ref_gneq, *gneq;
4719         char *ref_ned, *ned;
4720         int tbcpm = 0;
4721
4722         /* if CUIR request does not specify the scope use the path
4723            the attention message was presented on */
4724         if (!cuir->ned_map ||
4725             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
4726                 return lpum;
4727
4728         private = (struct dasd_eckd_private *) device->private;
4729         /* get reference conf data */
4730         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
4731         /* reference ned is determined by ned_map field */
4732         pos = 8 - ffs(cuir->ned_map);
4733         ref_ned = (char *)&ref_conf_data->neds[pos];
4734         ref_gneq = (char *)&ref_conf_data->gneq;
4735         /* transfer 24 bit neq_map to mask */
4736         mask = cuir->neq_map[2];
4737         mask |= cuir->neq_map[1] << 8;
4738         mask |= cuir->neq_map[0] << 16;
4739
4740         for (path = 0x80; path; path >>= 1) {
4741                 /* initialise data per path */
4742                 bitmask = mask;
4743                 pos = pathmask_to_pos(path);
4744                 conf_data = private->path_conf_data[pos];
4745                 pos = 8 - ffs(cuir->ned_map);
4746                 ned = (char *) &conf_data->neds[pos];
4747                 /* compare reference ned and per path ned */
4748                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
4749                         continue;
4750                 gneq = (char *)&conf_data->gneq;
4751                 /* compare reference gneq and per_path gneq under
4752                    24 bit mask where mask bit 0 equals byte 7 of
4753                    the gneq and mask bit 24 equals byte 31 */
4754                 while (bitmask) {
4755                         pos = ffs(bitmask) - 1;
4756                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
4757                             != 0)
4758                                 break;
4759                         clear_bit(pos, &bitmask);
4760                 }
4761                 if (bitmask)
4762                         continue;
4763                 /* device and path match the reference values
4764                    add path to CUIR scope */
4765                 tbcpm |= path;
4766         }
4767         return tbcpm;
4768 }
4769
4770 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
4771                                        unsigned long paths,
4772                                        struct subchannel_id sch_id, int action)
4773 {
4774         struct channel_path_desc *desc;
4775         int pos;
4776
4777         while (paths) {
4778                 /* get position of bit in mask */
4779                 pos = ffs(paths) - 1;
4780                 /* get channel path descriptor from this position */
4781                 desc = ccw_device_get_chp_desc(device->cdev, 7 - pos);
4782                 if (action == CUIR_QUIESCE)
4783                         pr_warn("Service on the storage server caused path "
4784                                 "%x.%02x to go offline", sch_id.cssid,
4785                                 desc ? desc->chpid : 0);
4786                 else if (action == CUIR_RESUME)
4787                         pr_info("Path %x.%02x is back online after service "
4788                                 "on the storage server", sch_id.cssid,
4789                                 desc ? desc->chpid : 0);
4790                 kfree(desc);
4791                 clear_bit(pos, &paths);
4792         }
4793 }
4794
4795 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
4796                                       struct dasd_cuir_message *cuir)
4797 {
4798         unsigned long tbcpm;
4799
4800         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
4801         /* nothing to do if path is not in use */
4802         if (!(device->path_data.opm & tbcpm))
4803                 return 0;
4804         if (!(device->path_data.opm & ~tbcpm)) {
4805                 /* no path would be left if the CUIR action is taken
4806                    return error */
4807                 return -EINVAL;
4808         }
4809         /* remove device from operational path mask */
4810         device->path_data.opm &= ~tbcpm;
4811         device->path_data.cuirpm |= tbcpm;
4812         return tbcpm;
4813 }
4814
4815 /*
4816  * walk through all devices and build a path mask to quiesce them
4817  * return an error if the last path to a device would be removed
4818  *
4819  * if only part of the devices are quiesced and an error
4820  * occurs no onlining necessary, the storage server will
4821  * notify the already set offline devices again
4822  */
4823 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
4824                                   struct subchannel_id sch_id,
4825                                   struct dasd_cuir_message *cuir)
4826 {
4827         struct alias_pav_group *pavgroup, *tempgroup;
4828         struct dasd_eckd_private *private;
4829         struct dasd_device *dev, *n;
4830         unsigned long paths = 0;
4831         unsigned long flags;
4832         int tbcpm;
4833
4834         private = (struct dasd_eckd_private *) device->private;
4835         /* active devices */
4836         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
4837                                  alias_list) {
4838                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4839                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4840                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
4841                 if (tbcpm < 0)
4842                         goto out_err;
4843                 paths |= tbcpm;
4844         }
4845         /* inactive devices */
4846         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
4847                                  alias_list) {
4848                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4849                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4850                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
4851                 if (tbcpm < 0)
4852                         goto out_err;
4853                 paths |= tbcpm;
4854         }
4855         /* devices in PAV groups */
4856         list_for_each_entry_safe(pavgroup, tempgroup,
4857                                  &private->lcu->grouplist, group) {
4858                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
4859                                          alias_list) {
4860                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4861                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4862                         spin_unlock_irqrestore(
4863                                 get_ccwdev_lock(dev->cdev), flags);
4864                         if (tbcpm < 0)
4865                                 goto out_err;
4866                         paths |= tbcpm;
4867                 }
4868                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
4869                                          alias_list) {
4870                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
4871                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
4872                         spin_unlock_irqrestore(
4873                                 get_ccwdev_lock(dev->cdev), flags);
4874                         if (tbcpm < 0)
4875                                 goto out_err;
4876                         paths |= tbcpm;
4877                 }
4878         }
4879         /* notify user about all paths affected by CUIR action */
4880         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_QUIESCE);
4881         return 0;
4882 out_err:
4883         return tbcpm;
4884 }
4885
4886 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
4887                                  struct subchannel_id sch_id,
4888                                  struct dasd_cuir_message *cuir)
4889 {
4890         struct alias_pav_group *pavgroup, *tempgroup;
4891         struct dasd_eckd_private *private;
4892         struct dasd_device *dev, *n;
4893         unsigned long paths = 0;
4894         int tbcpm;
4895
4896         private = (struct dasd_eckd_private *) device->private;
4897         /*
4898          * the path may have been added through a generic path event before
4899          * only trigger path verification if the path is not already in use
4900          */
4901         list_for_each_entry_safe(dev, n,
4902                                  &private->lcu->active_devices,
4903                                  alias_list) {
4904                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4905                 paths |= tbcpm;
4906                 if (!(dev->path_data.opm & tbcpm)) {
4907                         dev->path_data.tbvpm |= tbcpm;
4908                         dasd_schedule_device_bh(dev);
4909                 }
4910         }
4911         list_for_each_entry_safe(dev, n,
4912                                  &private->lcu->inactive_devices,
4913                                  alias_list) {
4914                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4915                 paths |= tbcpm;
4916                 if (!(dev->path_data.opm & tbcpm)) {
4917                         dev->path_data.tbvpm |= tbcpm;
4918                         dasd_schedule_device_bh(dev);
4919                 }
4920         }
4921         /* devices in PAV groups */
4922         list_for_each_entry_safe(pavgroup, tempgroup,
4923                                  &private->lcu->grouplist,
4924                                  group) {
4925                 list_for_each_entry_safe(dev, n,
4926                                          &pavgroup->baselist,
4927                                          alias_list) {
4928                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4929                         paths |= tbcpm;
4930                         if (!(dev->path_data.opm & tbcpm)) {
4931                                 dev->path_data.tbvpm |= tbcpm;
4932                                 dasd_schedule_device_bh(dev);
4933                         }
4934                 }
4935                 list_for_each_entry_safe(dev, n,
4936                                          &pavgroup->aliaslist,
4937                                          alias_list) {
4938                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
4939                         paths |= tbcpm;
4940                         if (!(dev->path_data.opm & tbcpm)) {
4941                                 dev->path_data.tbvpm |= tbcpm;
4942                                 dasd_schedule_device_bh(dev);
4943                         }
4944                 }
4945         }
4946         /* notify user about all paths affected by CUIR action */
4947         dasd_eckd_cuir_notify_user(device, paths, sch_id, CUIR_RESUME);
4948         return 0;
4949 }
4950
4951 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
4952                                  __u8 lpum)
4953 {
4954         struct dasd_cuir_message *cuir = messages;
4955         struct channel_path_desc *desc;
4956         struct subchannel_id sch_id;
4957         int pos, response;
4958
4959         DBF_DEV_EVENT(DBF_WARNING, device,
4960                       "CUIR request: %016llx %016llx %016llx %08x",
4961                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
4962                       ((u32 *)cuir)[3]);
4963         ccw_device_get_schid(device->cdev, &sch_id);
4964         pos = pathmask_to_pos(lpum);
4965         desc = ccw_device_get_chp_desc(device->cdev, pos);
4966
4967         if (cuir->code == CUIR_QUIESCE) {
4968                 /* quiesce */
4969                 if (dasd_eckd_cuir_quiesce(device, lpum, sch_id, cuir))
4970                         response = PSF_CUIR_LAST_PATH;
4971                 else
4972                         response = PSF_CUIR_COMPLETED;
4973         } else if (cuir->code == CUIR_RESUME) {
4974                 /* resume */
4975                 dasd_eckd_cuir_resume(device, lpum, sch_id, cuir);
4976                 response = PSF_CUIR_COMPLETED;
4977         } else
4978                 response = PSF_CUIR_NOT_SUPPORTED;
4979
4980         dasd_eckd_psf_cuir_response(device, response,
4981                                     cuir->message_id, desc, sch_id);
4982         DBF_DEV_EVENT(DBF_WARNING, device,
4983                       "CUIR response: %d on message ID %08x", response,
4984                       cuir->message_id);
4985         /* free descriptor copy */
4986         kfree(desc);
4987         /* to make sure there is no attention left schedule work again */
4988         device->discipline->check_attention(device, lpum);
4989 }
4990
4991 static void dasd_eckd_check_attention_work(struct work_struct *work)
4992 {
4993         struct check_attention_work_data *data;
4994         struct dasd_rssd_messages *messages;
4995         struct dasd_device *device;
4996         int rc;
4997
4998         data = container_of(work, struct check_attention_work_data, worker);
4999         device = data->device;
5000         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5001         if (!messages) {
5002                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5003                               "Could not allocate attention message buffer");
5004                 goto out;
5005         }
5006         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5007         if (rc)
5008                 goto out;
5009         if (messages->length == ATTENTION_LENGTH_CUIR &&
5010             messages->format == ATTENTION_FORMAT_CUIR)
5011                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5012 out:
5013         dasd_put_device(device);
5014         kfree(messages);
5015         kfree(data);
5016 }
5017
5018 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5019 {
5020         struct check_attention_work_data *data;
5021
5022         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5023         if (!data)
5024                 return -ENOMEM;
5025         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5026         dasd_get_device(device);
5027         data->device = device;
5028         data->lpum = lpum;
5029         schedule_work(&data->worker);
5030         return 0;
5031 }
5032
5033 static struct ccw_driver dasd_eckd_driver = {
5034         .driver = {
5035                 .name   = "dasd-eckd",
5036                 .owner  = THIS_MODULE,
5037         },
5038         .ids         = dasd_eckd_ids,
5039         .probe       = dasd_eckd_probe,
5040         .remove      = dasd_generic_remove,
5041         .set_offline = dasd_generic_set_offline,
5042         .set_online  = dasd_eckd_set_online,
5043         .notify      = dasd_generic_notify,
5044         .path_event  = dasd_generic_path_event,
5045         .shutdown    = dasd_generic_shutdown,
5046         .freeze      = dasd_generic_pm_freeze,
5047         .thaw        = dasd_generic_restore_device,
5048         .restore     = dasd_generic_restore_device,
5049         .uc_handler  = dasd_generic_uc_handler,
5050         .int_class   = IRQIO_DAS,
5051 };
5052
5053 /*
5054  * max_blocks is dependent on the amount of storage that is available
5055  * in the static io buffer for each device. Currently each device has
5056  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5057  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5058  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5059  * addition we have one define extent ccw + 16 bytes of data and one
5060  * locate record ccw + 16 bytes of data. That makes:
5061  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5062  * We want to fit two into the available memory so that we can immediately
5063  * start the next request if one finishes off. That makes 249.5 blocks
5064  * for one request. Give a little safety and the result is 240.
5065  */
5066 static struct dasd_discipline dasd_eckd_discipline = {
5067         .owner = THIS_MODULE,
5068         .name = "ECKD",
5069         .ebcname = "ECKD",
5070         .max_blocks = 190,
5071         .check_device = dasd_eckd_check_characteristics,
5072         .uncheck_device = dasd_eckd_uncheck_device,
5073         .do_analysis = dasd_eckd_do_analysis,
5074         .verify_path = dasd_eckd_verify_path,
5075         .basic_to_ready = dasd_eckd_basic_to_ready,
5076         .online_to_ready = dasd_eckd_online_to_ready,
5077         .basic_to_known = dasd_eckd_basic_to_known,
5078         .fill_geometry = dasd_eckd_fill_geometry,
5079         .start_IO = dasd_start_IO,
5080         .term_IO = dasd_term_IO,
5081         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5082         .format_device = dasd_eckd_format_device,
5083         .erp_action = dasd_eckd_erp_action,
5084         .erp_postaction = dasd_eckd_erp_postaction,
5085         .check_for_device_change = dasd_eckd_check_for_device_change,
5086         .build_cp = dasd_eckd_build_alias_cp,
5087         .free_cp = dasd_eckd_free_alias_cp,
5088         .dump_sense = dasd_eckd_dump_sense,
5089         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5090         .fill_info = dasd_eckd_fill_info,
5091         .ioctl = dasd_eckd_ioctl,
5092         .freeze = dasd_eckd_pm_freeze,
5093         .restore = dasd_eckd_restore_device,
5094         .reload = dasd_eckd_reload_device,
5095         .get_uid = dasd_eckd_get_uid,
5096         .kick_validate = dasd_eckd_kick_validate_server,
5097         .check_attention = dasd_eckd_check_attention,
5098 };
5099
5100 static int __init
5101 dasd_eckd_init(void)
5102 {
5103         int ret;
5104
5105         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5106         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5107                                    GFP_KERNEL | GFP_DMA);
5108         if (!dasd_reserve_req)
5109                 return -ENOMEM;
5110         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5111                                    GFP_KERNEL | GFP_DMA);
5112         if (!path_verification_worker) {
5113                 kfree(dasd_reserve_req);
5114                 return -ENOMEM;
5115         }
5116         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5117         if (!rawpadpage) {
5118                 kfree(path_verification_worker);
5119                 kfree(dasd_reserve_req);
5120                 return -ENOMEM;
5121         }
5122         ret = ccw_driver_register(&dasd_eckd_driver);
5123         if (!ret)
5124                 wait_for_device_probe();
5125         else {
5126                 kfree(path_verification_worker);
5127                 kfree(dasd_reserve_req);
5128                 free_page((unsigned long)rawpadpage);
5129         }
5130         return ret;
5131 }
5132
5133 static void __exit
5134 dasd_eckd_cleanup(void)
5135 {
5136         ccw_driver_unregister(&dasd_eckd_driver);
5137         kfree(path_verification_worker);
5138         kfree(dasd_reserve_req);
5139         free_page((unsigned long)rawpadpage);
5140 }
5141
5142 module_init(dasd_eckd_init);
5143 module_exit(dasd_eckd_cleanup);