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