drivers/s390/block/dasd_eckd.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  *                  Horst Hummel <Horst.Hummel@de.ibm.com>
   5  *                  Carsten Otte <Cotte@de.ibm.com>
   6  *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
   7  * Bugreports.to..: <Linux390@de.ibm.com>
   8  * Copyright IBM Corp. 1999, 2009
   9  * EMC Symmetrix ioctl Copyright EMC Corporation, 2008
  10  * Author.........: Nigel Hislop <hislop_nigel@emc.com>
  11  */
  12
  13 #define KMSG_COMPONENT "dasd-eckd"
  14
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/slab.h>
  18 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  19 #include <linux/bio.h>
  20 #include <linux/module.h>
  21 #include <linux/compat.h>
  22 #include <linux/init.h>
  23 #include <linux/seq_file.h>
  24
  25 #include <asm/css_chars.h>
  26 #include <asm/debug.h>
  27 #include <asm/idals.h>
  28 #include <asm/ebcdic.h>
  29 #include <asm/io.h>
  30 #include <linux/uaccess.h>
  31 #include <asm/cio.h>
  32 #include <asm/ccwdev.h>
  33 #include <asm/itcw.h>
  34 #include <asm/schid.h>
  35 #include <asm/chpid.h>
  36
  37 #include "dasd_int.h"
  38 #include "dasd_eckd.h"
  39
  40 #ifdef PRINTK_HEADER
  41 #undef PRINTK_HEADER
  42 #endif                          /* PRINTK_HEADER */
  43 #define PRINTK_HEADER "dasd(eckd):"
  44
  45 #define ECKD_C0(i) (i->home_bytes)
  46 #define ECKD_F(i) (i->formula)
  47 #define ECKD_F1(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f1):\
  48                     (i->factors.f_0x02.f1))
  49 #define ECKD_F2(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f2):\
  50                     (i->factors.f_0x02.f2))
  51 #define ECKD_F3(i) (ECKD_F(i)==0x01?(i->factors.f_0x01.f3):\
  52                     (i->factors.f_0x02.f3))
  53 #define ECKD_F4(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f4):0)
  54 #define ECKD_F5(i) (ECKD_F(i)==0x02?(i->factors.f_0x02.f5):0)
  55 #define ECKD_F6(i) (i->factor6)
  56 #define ECKD_F7(i) (i->factor7)
  57 #define ECKD_F8(i) (i->factor8)
  58
  59 /*
  60  * raw track access always map to 64k in memory
  61  * so it maps to 16 blocks of 4k per track
  62  */
  63 #define DASD_RAW_BLOCK_PER_TRACK 16
  64 #define DASD_RAW_BLOCKSIZE 4096
  65 /* 64k are 128 x 512 byte sectors  */
  66 #define DASD_RAW_SECTORS_PER_TRACK 128
  67
  68 MODULE_LICENSE("GPL");
  69
  70 static struct dasd_discipline dasd_eckd_discipline;
  71
  72 /* The ccw bus type uses this table to find devices that it sends to
  73  * dasd_eckd_probe */
  74 static struct ccw_device_id dasd_eckd_ids[] = {
  75         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3390, 0), .driver_info = 0x1},
  76         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3390, 0), .driver_info = 0x2},
  77         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3380, 0), .driver_info = 0x3},
  78         { CCW_DEVICE_DEVTYPE (0x3990, 0, 0x3380, 0), .driver_info = 0x4},
  79         { CCW_DEVICE_DEVTYPE (0x2105, 0, 0x3380, 0), .driver_info = 0x5},
  80         { CCW_DEVICE_DEVTYPE (0x9343, 0, 0x9345, 0), .driver_info = 0x6},
  81         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3390, 0), .driver_info = 0x7},
  82         { CCW_DEVICE_DEVTYPE (0x2107, 0, 0x3380, 0), .driver_info = 0x8},
  83         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3390, 0), .driver_info = 0x9},
  84         { CCW_DEVICE_DEVTYPE (0x1750, 0, 0x3380, 0), .driver_info = 0xa},
  85         { /* end of list */ },
  86 };
  87
  88 MODULE_DEVICE_TABLE(ccw, dasd_eckd_ids);
  89
  90 static struct ccw_driver dasd_eckd_driver; /* see below */
  91
  92 static void *rawpadpage;
  93
  94 #define INIT_CQR_OK 0
  95 #define INIT_CQR_UNFORMATTED 1
  96 #define INIT_CQR_ERROR 2
  97
  98 /* emergency request for reserve/release */
  99 static struct {
 100         struct dasd_ccw_req cqr;
 101         struct ccw1 ccw;
 102         char data[32];
 103 } *dasd_reserve_req;
 104 static DEFINE_MUTEX(dasd_reserve_mutex);
 105
 106 /* definitions for the path verification worker */
 107 struct path_verification_work_data {
 108         struct work_struct worker;
 109         struct dasd_device *device;
 110         struct dasd_ccw_req cqr;
 111         struct ccw1 ccw;
 112         __u8 rcd_buffer[DASD_ECKD_RCD_DATA_SIZE];
 113         int isglobal;
 114         __u8 tbvpm;
 115 };
 116 static struct path_verification_work_data *path_verification_worker;
 117 static DEFINE_MUTEX(dasd_path_verification_mutex);
 118
 119 struct check_attention_work_data {
 120         struct work_struct worker;
 121         struct dasd_device *device;
 122         __u8 lpum;
 123 };
 124
 125 static int prepare_itcw(struct itcw *, unsigned int, unsigned int, int,
 126                         struct dasd_device *, struct dasd_device *,
 127                         unsigned int, int, unsigned int, unsigned int,
 128                         unsigned int, unsigned int);
 129
 130 /* initial attempt at a probe function. this can be simplified once
 131  * the other detection code is gone */
 132 static int
 133 dasd_eckd_probe (struct ccw_device *cdev)
 134 {
 135         int ret;
 136
 137         /* set ECKD specific ccw-device options */
 138         ret = ccw_device_set_options(cdev, CCWDEV_ALLOW_FORCE |
 139                                      CCWDEV_DO_PATHGROUP | CCWDEV_DO_MULTIPATH);
 140         if (ret) {
 141                 DBF_EVENT_DEVID(DBF_WARNING, cdev, "%s",
 142                                 "dasd_eckd_probe: could not set "
 143                                 "ccw-device options");
 144                 return ret;
 145         }
 146         ret = dasd_generic_probe(cdev, &dasd_eckd_discipline);
 147         return ret;
 148 }
 149
 150 static int
 151 dasd_eckd_set_online(struct ccw_device *cdev)
 152 {
 153         return dasd_generic_set_online(cdev, &dasd_eckd_discipline);
 154 }
 155
 156 static const int sizes_trk0[] = { 28, 148, 84 };
 157 #define LABEL_SIZE 140
 158
 159 /* head and record addresses of count_area read in analysis ccw */
 160 static const int count_area_head[] = { 0, 0, 0, 0, 2 };
 161 static const int count_area_rec[] = { 1, 2, 3, 4, 1 };
 162
 163 static inline unsigned int
 164 round_up_multiple(unsigned int no, unsigned int mult)
 165 {
 166         int rem = no % mult;
 167         return (rem ? no - rem + mult : no);
 168 }
 169
 170 static inline unsigned int
 171 ceil_quot(unsigned int d1, unsigned int d2)
 172 {
 173         return (d1 + (d2 - 1)) / d2;
 174 }
 175
 176 static unsigned int
 177 recs_per_track(struct dasd_eckd_characteristics * rdc,
 178                unsigned int kl, unsigned int dl)
 179 {
 180         int dn, kn;
 181
 182         switch (rdc->dev_type) {
 183         case 0x3380:
 184                 if (kl)
 185                         return 1499 / (15 + 7 + ceil_quot(kl + 12, 32) +
 186                                        ceil_quot(dl + 12, 32));
 187                 else
 188                         return 1499 / (15 + ceil_quot(dl + 12, 32));
 189         case 0x3390:
 190                 dn = ceil_quot(dl + 6, 232) + 1;
 191                 if (kl) {
 192                         kn = ceil_quot(kl + 6, 232) + 1;
 193                         return 1729 / (10 + 9 + ceil_quot(kl + 6 * kn, 34) +
 194                                        9 + ceil_quot(dl + 6 * dn, 34));
 195                 } else
 196                         return 1729 / (10 + 9 + ceil_quot(dl + 6 * dn, 34));
 197         case 0x9345:
 198                 dn = ceil_quot(dl + 6, 232) + 1;
 199                 if (kl) {
 200                         kn = ceil_quot(kl + 6, 232) + 1;
 201                         return 1420 / (18 + 7 + ceil_quot(kl + 6 * kn, 34) +
 202                                        ceil_quot(dl + 6 * dn, 34));
 203                 } else
 204                         return 1420 / (18 + 7 + ceil_quot(dl + 6 * dn, 34));
 205         }
 206         return 0;
 207 }
 208
 209 static void set_ch_t(struct ch_t *geo, __u32 cyl, __u8 head)
 210 {
 211         geo->cyl = (__u16) cyl;
 212         geo->head = cyl >> 16;
 213         geo->head <<= 4;
 214         geo->head |= head;
 215 }
 216
 217 static int set_timestamp(struct ccw1 *ccw, struct DE_eckd_data *data,
 218                      struct dasd_device *device)
 219 {
 220         struct dasd_eckd_private *private = device->private;
 221         int rc;
 222
 223         rc = get_phys_clock(&data->ep_sys_time);
 224         /*
 225          * Ignore return code if XRC is not supported or
 226          * sync clock is switched off
 227          */
 228         if ((rc && !private->rdc_data.facilities.XRC_supported) ||
 229             rc == -EOPNOTSUPP || rc == -EACCES)
 230                 return 0;
 231
 232         /* switch on System Time Stamp - needed for XRC Support */
 233         data->ga_extended |= 0x08; /* switch on 'Time Stamp Valid'   */
 234         data->ga_extended |= 0x02; /* switch on 'Extended Parameter' */
 235
 236         if (ccw) {
 237                 ccw->count = sizeof(struct DE_eckd_data);
 238                 ccw->flags |= CCW_FLAG_SLI;
 239         }
 240
 241         return rc;
 242 }
 243
 244 static int
 245 define_extent(struct ccw1 *ccw, struct DE_eckd_data *data, unsigned int trk,
 246               unsigned int totrk, int cmd, struct dasd_device *device,
 247               int blksize)
 248 {
 249         struct dasd_eckd_private *private = device->private;
 250         u16 heads, beghead, endhead;
 251         u32 begcyl, endcyl;
 252         int rc = 0;
 253
 254         if (ccw) {
 255                 ccw->cmd_code = DASD_ECKD_CCW_DEFINE_EXTENT;
 256                 ccw->flags = 0;
 257                 ccw->count = 16;
 258                 ccw->cda = (__u32)__pa(data);
 259         }
 260
 261         memset(data, 0, sizeof(struct DE_eckd_data));
 262         switch (cmd) {
 263         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 264         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 265         case DASD_ECKD_CCW_READ:
 266         case DASD_ECKD_CCW_READ_MT:
 267         case DASD_ECKD_CCW_READ_CKD:
 268         case DASD_ECKD_CCW_READ_CKD_MT:
 269         case DASD_ECKD_CCW_READ_KD:
 270         case DASD_ECKD_CCW_READ_KD_MT:
 271                 data->mask.perm = 0x1;
 272                 data->attributes.operation = private->attrib.operation;
 273                 break;
 274         case DASD_ECKD_CCW_READ_COUNT:
 275                 data->mask.perm = 0x1;
 276                 data->attributes.operation = DASD_BYPASS_CACHE;
 277                 break;
 278         case DASD_ECKD_CCW_READ_TRACK:
 279         case DASD_ECKD_CCW_READ_TRACK_DATA:
 280                 data->mask.perm = 0x1;
 281                 data->attributes.operation = private->attrib.operation;
 282                 data->blk_size = 0;
 283                 break;
 284         case DASD_ECKD_CCW_WRITE:
 285         case DASD_ECKD_CCW_WRITE_MT:
 286         case DASD_ECKD_CCW_WRITE_KD:
 287         case DASD_ECKD_CCW_WRITE_KD_MT:
 288                 data->mask.perm = 0x02;
 289                 data->attributes.operation = private->attrib.operation;
 290                 rc = set_timestamp(ccw, data, device);
 291                 break;
 292         case DASD_ECKD_CCW_WRITE_CKD:
 293         case DASD_ECKD_CCW_WRITE_CKD_MT:
 294                 data->attributes.operation = DASD_BYPASS_CACHE;
 295                 rc = set_timestamp(ccw, data, device);
 296                 break;
 297         case DASD_ECKD_CCW_ERASE:
 298         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 299         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 300                 data->mask.perm = 0x3;
 301                 data->mask.auth = 0x1;
 302                 data->attributes.operation = DASD_BYPASS_CACHE;
 303                 rc = set_timestamp(ccw, data, device);
 304                 break;
 305         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 306                 data->mask.perm = 0x03;
 307                 data->attributes.operation = private->attrib.operation;
 308                 data->blk_size = 0;
 309                 break;
 310         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 311                 data->mask.perm = 0x02;
 312                 data->attributes.operation = private->attrib.operation;
 313                 data->blk_size = blksize;
 314                 rc = set_timestamp(ccw, data, device);
 315                 break;
 316         default:
 317                 dev_err(&device->cdev->dev,
 318                         "0x%x is not a known command\n", cmd);
 319                 break;
 320         }
 321
 322         data->attributes.mode = 0x3;    /* ECKD */
 323
 324         if ((private->rdc_data.cu_type == 0x2105 ||
 325              private->rdc_data.cu_type == 0x2107 ||
 326              private->rdc_data.cu_type == 0x1750)
 327             && !(private->uses_cdl && trk < 2))
 328                 data->ga_extended |= 0x40; /* Regular Data Format Mode */
 329
 330         heads = private->rdc_data.trk_per_cyl;
 331         begcyl = trk / heads;
 332         beghead = trk % heads;
 333         endcyl = totrk / heads;
 334         endhead = totrk % heads;
 335
 336         /* check for sequential prestage - enhance cylinder range */
 337         if (data->attributes.operation == DASD_SEQ_PRESTAGE ||
 338             data->attributes.operation == DASD_SEQ_ACCESS) {
 339
 340                 if (endcyl + private->attrib.nr_cyl < private->real_cyl)
 341                         endcyl += private->attrib.nr_cyl;
 342                 else
 343                         endcyl = (private->real_cyl - 1);
 344         }
 345
 346         set_ch_t(&data->beg_ext, begcyl, beghead);
 347         set_ch_t(&data->end_ext, endcyl, endhead);
 348         return rc;
 349 }
 350
 351
 352 static void locate_record_ext(struct ccw1 *ccw, struct LRE_eckd_data *data,
 353                               unsigned int trk, unsigned int rec_on_trk,
 354                               int count, int cmd, struct dasd_device *device,
 355                               unsigned int reclen, unsigned int tlf)
 356 {
 357         struct dasd_eckd_private *private = device->private;
 358         int sector;
 359         int dn, d;
 360
 361         if (ccw) {
 362                 ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD_EXT;
 363                 ccw->flags = 0;
 364                 if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK)
 365                         ccw->count = 22;
 366                 else
 367                         ccw->count = 20;
 368                 ccw->cda = (__u32)__pa(data);
 369         }
 370
 371         memset(data, 0, sizeof(*data));
 372         sector = 0;
 373         if (rec_on_trk) {
 374                 switch (private->rdc_data.dev_type) {
 375                 case 0x3390:
 376                         dn = ceil_quot(reclen + 6, 232);
 377                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 378                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 379                         break;
 380                 case 0x3380:
 381                         d = 7 + ceil_quot(reclen + 12, 32);
 382                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 383                         break;
 384                 }
 385         }
 386         data->sector = sector;
 387         /* note: meaning of count depends on the operation
 388          *       for record based I/O it's the number of records, but for
 389          *       track based I/O it's the number of tracks
 390          */
 391         data->count = count;
 392         switch (cmd) {
 393         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 394                 data->operation.orientation = 0x3;
 395                 data->operation.operation = 0x03;
 396                 break;
 397         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 398                 data->operation.orientation = 0x3;
 399                 data->operation.operation = 0x16;
 400                 break;
 401         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 402                 data->operation.orientation = 0x1;
 403                 data->operation.operation = 0x03;
 404                 data->count++;
 405                 break;
 406         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 407                 data->operation.orientation = 0x3;
 408                 data->operation.operation = 0x16;
 409                 data->count++;
 410                 break;
 411         case DASD_ECKD_CCW_WRITE:
 412         case DASD_ECKD_CCW_WRITE_MT:
 413         case DASD_ECKD_CCW_WRITE_KD:
 414         case DASD_ECKD_CCW_WRITE_KD_MT:
 415                 data->auxiliary.length_valid = 0x1;
 416                 data->length = reclen;
 417                 data->operation.operation = 0x01;
 418                 break;
 419         case DASD_ECKD_CCW_WRITE_CKD:
 420         case DASD_ECKD_CCW_WRITE_CKD_MT:
 421                 data->auxiliary.length_valid = 0x1;
 422                 data->length = reclen;
 423                 data->operation.operation = 0x03;
 424                 break;
 425         case DASD_ECKD_CCW_WRITE_FULL_TRACK:
 426                 data->operation.orientation = 0x0;
 427                 data->operation.operation = 0x3F;
 428                 data->extended_operation = 0x11;
 429                 data->length = 0;
 430                 data->extended_parameter_length = 0x02;
 431                 if (data->count > 8) {
 432                         data->extended_parameter[0] = 0xFF;
 433                         data->extended_parameter[1] = 0xFF;
 434                         data->extended_parameter[1] <<= (16 - count);
 435                 } else {
 436                         data->extended_parameter[0] = 0xFF;
 437                         data->extended_parameter[0] <<= (8 - count);
 438                         data->extended_parameter[1] = 0x00;
 439                 }
 440                 data->sector = 0xFF;
 441                 break;
 442         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
 443                 data->auxiliary.length_valid = 0x1;
 444                 data->length = reclen;  /* not tlf, as one might think */
 445                 data->operation.operation = 0x3F;
 446                 data->extended_operation = 0x23;
 447                 break;
 448         case DASD_ECKD_CCW_READ:
 449         case DASD_ECKD_CCW_READ_MT:
 450         case DASD_ECKD_CCW_READ_KD:
 451         case DASD_ECKD_CCW_READ_KD_MT:
 452                 data->auxiliary.length_valid = 0x1;
 453                 data->length = reclen;
 454                 data->operation.operation = 0x06;
 455                 break;
 456         case DASD_ECKD_CCW_READ_CKD:
 457         case DASD_ECKD_CCW_READ_CKD_MT:
 458                 data->auxiliary.length_valid = 0x1;
 459                 data->length = reclen;
 460                 data->operation.operation = 0x16;
 461                 break;
 462         case DASD_ECKD_CCW_READ_COUNT:
 463                 data->operation.operation = 0x06;
 464                 break;
 465         case DASD_ECKD_CCW_READ_TRACK:
 466                 data->operation.orientation = 0x1;
 467                 data->operation.operation = 0x0C;
 468                 data->extended_parameter_length = 0;
 469                 data->sector = 0xFF;
 470                 break;
 471         case DASD_ECKD_CCW_READ_TRACK_DATA:
 472                 data->auxiliary.length_valid = 0x1;
 473                 data->length = tlf;
 474                 data->operation.operation = 0x0C;
 475                 break;
 476         case DASD_ECKD_CCW_ERASE:
 477                 data->length = reclen;
 478                 data->auxiliary.length_valid = 0x1;
 479                 data->operation.operation = 0x0b;
 480                 break;
 481         default:
 482                 DBF_DEV_EVENT(DBF_ERR, device,
 483                             "fill LRE unknown opcode 0x%x", cmd);
 484                 BUG();
 485         }
 486         set_ch_t(&data->seek_addr,
 487                  trk / private->rdc_data.trk_per_cyl,
 488                  trk % private->rdc_data.trk_per_cyl);
 489         data->search_arg.cyl = data->seek_addr.cyl;
 490         data->search_arg.head = data->seek_addr.head;
 491         data->search_arg.record = rec_on_trk;
 492 }
 493
 494 static int prefix_LRE(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 495                       unsigned int trk, unsigned int totrk, int cmd,
 496                       struct dasd_device *basedev, struct dasd_device *startdev,
 497                       unsigned int format, unsigned int rec_on_trk, int count,
 498                       unsigned int blksize, unsigned int tlf)
 499 {
 500         struct dasd_eckd_private *basepriv, *startpriv;
 501         struct LRE_eckd_data *lredata;
 502         struct DE_eckd_data *dedata;
 503         int rc = 0;
 504
 505         basepriv = basedev->private;
 506         startpriv = startdev->private;
 507         dedata = &pfxdata->define_extent;
 508         lredata = &pfxdata->locate_record;
 509
 510         ccw->cmd_code = DASD_ECKD_CCW_PFX;
 511         ccw->flags = 0;
 512         if (cmd == DASD_ECKD_CCW_WRITE_FULL_TRACK) {
 513                 ccw->count = sizeof(*pfxdata) + 2;
 514                 ccw->cda = (__u32) __pa(pfxdata);
 515                 memset(pfxdata, 0, sizeof(*pfxdata) + 2);
 516         } else {
 517                 ccw->count = sizeof(*pfxdata);
 518                 ccw->cda = (__u32) __pa(pfxdata);
 519                 memset(pfxdata, 0, sizeof(*pfxdata));
 520         }
 521
 522         /* prefix data */
 523         if (format > 1) {
 524                 DBF_DEV_EVENT(DBF_ERR, basedev,
 525                               "PFX LRE unknown format 0x%x", format);
 526                 BUG();
 527                 return -EINVAL;
 528         }
 529         pfxdata->format = format;
 530         pfxdata->base_address = basepriv->ned->unit_addr;
 531         pfxdata->base_lss = basepriv->ned->ID;
 532         pfxdata->validity.define_extent = 1;
 533
 534         /* private uid is kept up to date, conf_data may be outdated */
 535         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
 536                 pfxdata->validity.verify_base = 1;
 537
 538         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
 539                 pfxdata->validity.verify_base = 1;
 540                 pfxdata->validity.hyper_pav = 1;
 541         }
 542
 543         rc = define_extent(NULL, dedata, trk, totrk, cmd, basedev, blksize);
 544
 545         /*
 546          * For some commands the System Time Stamp is set in the define extent
 547          * data when XRC is supported. The validity of the time stamp must be
 548          * reflected in the prefix data as well.
 549          */
 550         if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
 551                 pfxdata->validity.time_stamp = 1; /* 'Time Stamp Valid'   */
 552
 553         if (format == 1) {
 554                 locate_record_ext(NULL, lredata, trk, rec_on_trk, count, cmd,
 555                                   basedev, blksize, tlf);
 556         }
 557
 558         return rc;
 559 }
 560
 561 static int prefix(struct ccw1 *ccw, struct PFX_eckd_data *pfxdata,
 562                   unsigned int trk, unsigned int totrk, int cmd,
 563                   struct dasd_device *basedev, struct dasd_device *startdev)
 564 {
 565         return prefix_LRE(ccw, pfxdata, trk, totrk, cmd, basedev, startdev,
 566                           0, 0, 0, 0, 0);
 567 }
 568
 569 static void
 570 locate_record(struct ccw1 *ccw, struct LO_eckd_data *data, unsigned int trk,
 571               unsigned int rec_on_trk, int no_rec, int cmd,
 572               struct dasd_device * device, int reclen)
 573 {
 574         struct dasd_eckd_private *private = device->private;
 575         int sector;
 576         int dn, d;
 577
 578         DBF_DEV_EVENT(DBF_INFO, device,
 579                   "Locate: trk %d, rec %d, no_rec %d, cmd %d, reclen %d",
 580                   trk, rec_on_trk, no_rec, cmd, reclen);
 581
 582         ccw->cmd_code = DASD_ECKD_CCW_LOCATE_RECORD;
 583         ccw->flags = 0;
 584         ccw->count = 16;
 585         ccw->cda = (__u32) __pa(data);
 586
 587         memset(data, 0, sizeof(struct LO_eckd_data));
 588         sector = 0;
 589         if (rec_on_trk) {
 590                 switch (private->rdc_data.dev_type) {
 591                 case 0x3390:
 592                         dn = ceil_quot(reclen + 6, 232);
 593                         d = 9 + ceil_quot(reclen + 6 * (dn + 1), 34);
 594                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
 595                         break;
 596                 case 0x3380:
 597                         d = 7 + ceil_quot(reclen + 12, 32);
 598                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
 599                         break;
 600                 }
 601         }
 602         data->sector = sector;
 603         data->count = no_rec;
 604         switch (cmd) {
 605         case DASD_ECKD_CCW_WRITE_HOME_ADDRESS:
 606                 data->operation.orientation = 0x3;
 607                 data->operation.operation = 0x03;
 608                 break;
 609         case DASD_ECKD_CCW_READ_HOME_ADDRESS:
 610                 data->operation.orientation = 0x3;
 611                 data->operation.operation = 0x16;
 612                 break;
 613         case DASD_ECKD_CCW_WRITE_RECORD_ZERO:
 614                 data->operation.orientation = 0x1;
 615                 data->operation.operation = 0x03;
 616                 data->count++;
 617                 break;
 618         case DASD_ECKD_CCW_READ_RECORD_ZERO:
 619                 data->operation.orientation = 0x3;
 620                 data->operation.operation = 0x16;
 621                 data->count++;
 622                 break;
 623         case DASD_ECKD_CCW_WRITE:
 624         case DASD_ECKD_CCW_WRITE_MT:
 625         case DASD_ECKD_CCW_WRITE_KD:
 626         case DASD_ECKD_CCW_WRITE_KD_MT:
 627                 data->auxiliary.last_bytes_used = 0x1;
 628                 data->length = reclen;
 629                 data->operation.operation = 0x01;
 630                 break;
 631         case DASD_ECKD_CCW_WRITE_CKD:
 632         case DASD_ECKD_CCW_WRITE_CKD_MT:
 633                 data->auxiliary.last_bytes_used = 0x1;
 634                 data->length = reclen;
 635                 data->operation.operation = 0x03;
 636                 break;
 637         case DASD_ECKD_CCW_READ:
 638         case DASD_ECKD_CCW_READ_MT:
 639         case DASD_ECKD_CCW_READ_KD:
 640         case DASD_ECKD_CCW_READ_KD_MT:
 641                 data->auxiliary.last_bytes_used = 0x1;
 642                 data->length = reclen;
 643                 data->operation.operation = 0x06;
 644                 break;
 645         case DASD_ECKD_CCW_READ_CKD:
 646         case DASD_ECKD_CCW_READ_CKD_MT:
 647                 data->auxiliary.last_bytes_used = 0x1;
 648                 data->length = reclen;
 649                 data->operation.operation = 0x16;
 650                 break;
 651         case DASD_ECKD_CCW_READ_COUNT:
 652                 data->operation.operation = 0x06;
 653                 break;
 654         case DASD_ECKD_CCW_ERASE:
 655                 data->length = reclen;
 656                 data->auxiliary.last_bytes_used = 0x1;
 657                 data->operation.operation = 0x0b;
 658                 break;
 659         default:
 660                 DBF_DEV_EVENT(DBF_ERR, device, "unknown locate record "
 661                               "opcode 0x%x", cmd);
 662         }
 663         set_ch_t(&data->seek_addr,
 664                  trk / private->rdc_data.trk_per_cyl,
 665                  trk % private->rdc_data.trk_per_cyl);
 666         data->search_arg.cyl = data->seek_addr.cyl;
 667         data->search_arg.head = data->seek_addr.head;
 668         data->search_arg.record = rec_on_trk;
 669 }
 670
 671 /*
 672  * Returns 1 if the block is one of the special blocks that needs
 673  * to get read/written with the KD variant of the command.
 674  * That is DASD_ECKD_READ_KD_MT instead of DASD_ECKD_READ_MT and
 675  * DASD_ECKD_WRITE_KD_MT instead of DASD_ECKD_WRITE_MT.
 676  * Luckily the KD variants differ only by one bit (0x08) from the
 677  * normal variant. So don't wonder about code like:
 678  * if (dasd_eckd_cdl_special(blk_per_trk, recid))
 679  *         ccw->cmd_code |= 0x8;
 680  */
 681 static inline int
 682 dasd_eckd_cdl_special(int blk_per_trk, int recid)
 683 {
 684         if (recid < 3)
 685                 return 1;
 686         if (recid < blk_per_trk)
 687                 return 0;
 688         if (recid < 2 * blk_per_trk)
 689                 return 1;
 690         return 0;
 691 }
 692
 693 /*
 694  * Returns the record size for the special blocks of the cdl format.
 695  * Only returns something useful if dasd_eckd_cdl_special is true
 696  * for the recid.
 697  */
 698 static inline int
 699 dasd_eckd_cdl_reclen(int recid)
 700 {
 701         if (recid < 3)
 702                 return sizes_trk0[recid];
 703         return LABEL_SIZE;
 704 }
 705 /* create unique id from private structure. */
 706 static void create_uid(struct dasd_eckd_private *private)
 707 {
 708         int count;
 709         struct dasd_uid *uid;
 710
 711         uid = &private->uid;
 712         memset(uid, 0, sizeof(struct dasd_uid));
 713         memcpy(uid->vendor, private->ned->HDA_manufacturer,
 714                sizeof(uid->vendor) - 1);
 715         EBCASC(uid->vendor, sizeof(uid->vendor) - 1);
 716         memcpy(uid->serial, private->ned->HDA_location,
 717                sizeof(uid->serial) - 1);
 718         EBCASC(uid->serial, sizeof(uid->serial) - 1);
 719         uid->ssid = private->gneq->subsystemID;
 720         uid->real_unit_addr = private->ned->unit_addr;
 721         if (private->sneq) {
 722                 uid->type = private->sneq->sua_flags;
 723                 if (uid->type == UA_BASE_PAV_ALIAS)
 724                         uid->base_unit_addr = private->sneq->base_unit_addr;
 725         } else {
 726                 uid->type = UA_BASE_DEVICE;
 727         }
 728         if (private->vdsneq) {
 729                 for (count = 0; count < 16; count++) {
 730                         sprintf(uid->vduit+2*count, "%02x",
 731                                 private->vdsneq->uit[count]);
 732                 }
 733         }
 734 }
 735
 736 /*
 737  * Generate device unique id that specifies the physical device.
 738  */
 739 static int dasd_eckd_generate_uid(struct dasd_device *device)
 740 {
 741         struct dasd_eckd_private *private = device->private;
 742         unsigned long flags;
 743
 744         if (!private)
 745                 return -ENODEV;
 746         if (!private->ned || !private->gneq)
 747                 return -ENODEV;
 748         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 749         create_uid(private);
 750         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 751         return 0;
 752 }
 753
 754 static int dasd_eckd_get_uid(struct dasd_device *device, struct dasd_uid *uid)
 755 {
 756         struct dasd_eckd_private *private = device->private;
 757         unsigned long flags;
 758
 759         if (private) {
 760                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
 761                 *uid = private->uid;
 762                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
 763                 return 0;
 764         }
 765         return -EINVAL;
 766 }
 767
 768 /*
 769  * compare device UID with data of a given dasd_eckd_private structure
 770  * return 0 for match
 771  */
 772 static int dasd_eckd_compare_path_uid(struct dasd_device *device,
 773                                       struct dasd_eckd_private *private)
 774 {
 775         struct dasd_uid device_uid;
 776
 777         create_uid(private);
 778         dasd_eckd_get_uid(device, &device_uid);
 779
 780         return memcmp(&device_uid, &private->uid, sizeof(struct dasd_uid));
 781 }
 782
 783 static void dasd_eckd_fill_rcd_cqr(struct dasd_device *device,
 784                                    struct dasd_ccw_req *cqr,
 785                                    __u8 *rcd_buffer,
 786                                    __u8 lpm)
 787 {
 788         struct ccw1 *ccw;
 789         /*
 790          * buffer has to start with EBCDIC "V1.0" to show
 791          * support for virtual device SNEQ
 792          */
 793         rcd_buffer[0] = 0xE5;
 794         rcd_buffer[1] = 0xF1;
 795         rcd_buffer[2] = 0x4B;
 796         rcd_buffer[3] = 0xF0;
 797
 798         ccw = cqr->cpaddr;
 799         ccw->cmd_code = DASD_ECKD_CCW_RCD;
 800         ccw->flags = 0;
 801         ccw->cda = (__u32)(addr_t)rcd_buffer;
 802         ccw->count = DASD_ECKD_RCD_DATA_SIZE;
 803         cqr->magic = DASD_ECKD_MAGIC;
 804
 805         cqr->startdev = device;
 806         cqr->memdev = device;
 807         cqr->block = NULL;
 808         cqr->expires = 10*HZ;
 809         cqr->lpm = lpm;
 810         cqr->retries = 256;
 811         cqr->buildclk = get_tod_clock();
 812         cqr->status = DASD_CQR_FILLED;
 813         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
 814 }
 815
 816 /*
 817  * Wakeup helper for read_conf
 818  * if the cqr is not done and needs some error recovery
 819  * the buffer has to be re-initialized with the EBCDIC "V1.0"
 820  * to show support for virtual device SNEQ
 821  */
 822 static void read_conf_cb(struct dasd_ccw_req *cqr, void *data)
 823 {
 824         struct ccw1 *ccw;
 825         __u8 *rcd_buffer;
 826
 827         if (cqr->status !=  DASD_CQR_DONE) {
 828                 ccw = cqr->cpaddr;
 829                 rcd_buffer = (__u8 *)((addr_t) ccw->cda);
 830                 memset(rcd_buffer, 0, sizeof(*rcd_buffer));
 831
 832                 rcd_buffer[0] = 0xE5;
 833                 rcd_buffer[1] = 0xF1;
 834                 rcd_buffer[2] = 0x4B;
 835                 rcd_buffer[3] = 0xF0;
 836         }
 837         dasd_wakeup_cb(cqr, data);
 838 }
 839
 840 static int dasd_eckd_read_conf_immediately(struct dasd_device *device,
 841                                            struct dasd_ccw_req *cqr,
 842                                            __u8 *rcd_buffer,
 843                                            __u8 lpm)
 844 {
 845         struct ciw *ciw;
 846         int rc;
 847         /*
 848          * sanity check: scan for RCD command in extended SenseID data
 849          * some devices do not support RCD
 850          */
 851         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 852         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD)
 853                 return -EOPNOTSUPP;
 854
 855         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buffer, lpm);
 856         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
 857         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
 858         cqr->retries = 5;
 859         cqr->callback = read_conf_cb;
 860         rc = dasd_sleep_on_immediatly(cqr);
 861         return rc;
 862 }
 863
 864 static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
 865                                    void **rcd_buffer,
 866                                    int *rcd_buffer_size, __u8 lpm)
 867 {
 868         struct ciw *ciw;
 869         char *rcd_buf = NULL;
 870         int ret;
 871         struct dasd_ccw_req *cqr;
 872
 873         /*
 874          * sanity check: scan for RCD command in extended SenseID data
 875          * some devices do not support RCD
 876          */
 877         ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
 878         if (!ciw || ciw->cmd != DASD_ECKD_CCW_RCD) {
 879                 ret = -EOPNOTSUPP;
 880                 goto out_error;
 881         }
 882         rcd_buf = kzalloc(DASD_ECKD_RCD_DATA_SIZE, GFP_KERNEL | GFP_DMA);
 883         if (!rcd_buf) {
 884                 ret = -ENOMEM;
 885                 goto out_error;
 886         }
 887         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */,
 888                                    0, /* use rcd_buf as data ara */
 889                                    device, NULL);
 890         if (IS_ERR(cqr)) {
 891                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
 892                               "Could not allocate RCD request");
 893                 ret = -ENOMEM;
 894                 goto out_error;
 895         }
 896         dasd_eckd_fill_rcd_cqr(device, cqr, rcd_buf, lpm);
 897         cqr->callback = read_conf_cb;
 898         ret = dasd_sleep_on(cqr);
 899         /*
 900          * on success we update the user input parms
 901          */
 902         dasd_sfree_request(cqr, cqr->memdev);
 903         if (ret)
 904                 goto out_error;
 905
 906         *rcd_buffer_size = DASD_ECKD_RCD_DATA_SIZE;
 907         *rcd_buffer = rcd_buf;
 908         return 0;
 909 out_error:
 910         kfree(rcd_buf);
 911         *rcd_buffer = NULL;
 912         *rcd_buffer_size = 0;
 913         return ret;
 914 }
 915
 916 static int dasd_eckd_identify_conf_parts(struct dasd_eckd_private *private)
 917 {
 918
 919         struct dasd_sneq *sneq;
 920         int i, count;
 921
 922         private->ned = NULL;
 923         private->sneq = NULL;
 924         private->vdsneq = NULL;
 925         private->gneq = NULL;
 926         count = private->conf_len / sizeof(struct dasd_sneq);
 927         sneq = (struct dasd_sneq *)private->conf_data;
 928         for (i = 0; i < count; ++i) {
 929                 if (sneq->flags.identifier == 1 && sneq->format == 1)
 930                         private->sneq = sneq;
 931                 else if (sneq->flags.identifier == 1 && sneq->format == 4)
 932                         private->vdsneq = (struct vd_sneq *)sneq;
 933                 else if (sneq->flags.identifier == 2)
 934                         private->gneq = (struct dasd_gneq *)sneq;
 935                 else if (sneq->flags.identifier == 3 && sneq->res1 == 1)
 936                         private->ned = (struct dasd_ned *)sneq;
 937                 sneq++;
 938         }
 939         if (!private->ned || !private->gneq) {
 940                 private->ned = NULL;
 941                 private->sneq = NULL;
 942                 private->vdsneq = NULL;
 943                 private->gneq = NULL;
 944                 return -EINVAL;
 945         }
 946         return 0;
 947
 948 };
 949
 950 static unsigned char dasd_eckd_path_access(void *conf_data, int conf_len)
 951 {
 952         struct dasd_gneq *gneq;
 953         int i, count, found;
 954
 955         count = conf_len / sizeof(*gneq);
 956         gneq = (struct dasd_gneq *)conf_data;
 957         found = 0;
 958         for (i = 0; i < count; ++i) {
 959                 if (gneq->flags.identifier == 2) {
 960                         found = 1;
 961                         break;
 962                 }
 963                 gneq++;
 964         }
 965         if (found)
 966                 return ((char *)gneq)[18] & 0x07;
 967         else
 968                 return 0;
 969 }
 970
 971 static void dasd_eckd_clear_conf_data(struct dasd_device *device)
 972 {
 973         struct dasd_eckd_private *private = device->private;
 974         int i;
 975
 976         private->conf_data = NULL;
 977         private->conf_len = 0;
 978         for (i = 0; i < 8; i++) {
 979                 kfree(device->path[i].conf_data);
 980                 device->path[i].conf_data = NULL;
 981                 device->path[i].cssid = 0;
 982                 device->path[i].ssid = 0;
 983                 device->path[i].chpid = 0;
 984         }
 985 }
 986
 987
 988 static int dasd_eckd_read_conf(struct dasd_device *device)
 989 {
 990         void *conf_data;
 991         int conf_len, conf_data_saved;
 992         int rc, path_err, pos;
 993         __u8 lpm, opm;
 994         struct dasd_eckd_private *private, path_private;
 995         struct dasd_uid *uid;
 996         char print_path_uid[60], print_device_uid[60];
 997         struct channel_path_desc_fmt0 *chp_desc;
 998         struct subchannel_id sch_id;
 999
1000         private = device->private;
1001         opm = ccw_device_get_path_mask(device->cdev);
1002         ccw_device_get_schid(device->cdev, &sch_id);
1003         conf_data_saved = 0;
1004         path_err = 0;
1005         /* get configuration data per operational path */
1006         for (lpm = 0x80; lpm; lpm>>= 1) {
1007                 if (!(lpm & opm))
1008                         continue;
1009                 rc = dasd_eckd_read_conf_lpm(device, &conf_data,
1010                                              &conf_len, lpm);
1011                 if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
1012                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1013                                         "Read configuration data returned "
1014                                         "error %d", rc);
1015                         return rc;
1016                 }
1017                 if (conf_data == NULL) {
1018                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1019                                         "No configuration data "
1020                                         "retrieved");
1021                         /* no further analysis possible */
1022                         dasd_path_add_opm(device, opm);
1023                         continue;       /* no error */
1024                 }
1025                 /* save first valid configuration data */
1026                 if (!conf_data_saved) {
1027                         /* initially clear previously stored conf_data */
1028                         dasd_eckd_clear_conf_data(device);
1029                         private->conf_data = conf_data;
1030                         private->conf_len = conf_len;
1031                         if (dasd_eckd_identify_conf_parts(private)) {
1032                                 private->conf_data = NULL;
1033                                 private->conf_len = 0;
1034                                 kfree(conf_data);
1035                                 continue;
1036                         }
1037                         pos = pathmask_to_pos(lpm);
1038                         /* store per path conf_data */
1039                         device->path[pos].conf_data = conf_data;
1040                         device->path[pos].cssid = sch_id.cssid;
1041                         device->path[pos].ssid = sch_id.ssid;
1042                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1043                         if (chp_desc)
1044                                 device->path[pos].chpid = chp_desc->chpid;
1045                         kfree(chp_desc);
1046                         /*
1047                          * build device UID that other path data
1048                          * can be compared to it
1049                          */
1050                         dasd_eckd_generate_uid(device);
1051                         conf_data_saved++;
1052                 } else {
1053                         path_private.conf_data = conf_data;
1054                         path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1055                         if (dasd_eckd_identify_conf_parts(
1056                                     &path_private)) {
1057                                 path_private.conf_data = NULL;
1058                                 path_private.conf_len = 0;
1059                                 kfree(conf_data);
1060                                 continue;
1061                         }
1062                         if (dasd_eckd_compare_path_uid(
1063                                     device, &path_private)) {
1064                                 uid = &path_private.uid;
1065                                 if (strlen(uid->vduit) > 0)
1066                                         snprintf(print_path_uid,
1067                                                  sizeof(print_path_uid),
1068                                                  "%s.%s.%04x.%02x.%s",
1069                                                  uid->vendor, uid->serial,
1070                                                  uid->ssid, uid->real_unit_addr,
1071                                                  uid->vduit);
1072                                 else
1073                                         snprintf(print_path_uid,
1074                                                  sizeof(print_path_uid),
1075                                                  "%s.%s.%04x.%02x",
1076                                                  uid->vendor, uid->serial,
1077                                                  uid->ssid,
1078                                                  uid->real_unit_addr);
1079                                 uid = &private->uid;
1080                                 if (strlen(uid->vduit) > 0)
1081                                         snprintf(print_device_uid,
1082                                                  sizeof(print_device_uid),
1083                                                  "%s.%s.%04x.%02x.%s",
1084                                                  uid->vendor, uid->serial,
1085                                                  uid->ssid, uid->real_unit_addr,
1086                                                  uid->vduit);
1087                                 else
1088                                         snprintf(print_device_uid,
1089                                                  sizeof(print_device_uid),
1090                                                  "%s.%s.%04x.%02x",
1091                                                  uid->vendor, uid->serial,
1092                                                  uid->ssid,
1093                                                  uid->real_unit_addr);
1094                                 dev_err(&device->cdev->dev,
1095                                         "Not all channel paths lead to "
1096                                         "the same device, path %02X leads to "
1097                                         "device %s instead of %s\n", lpm,
1098                                         print_path_uid, print_device_uid);
1099                                 path_err = -EINVAL;
1100                                 dasd_path_add_cablepm(device, lpm);
1101                                 continue;
1102                         }
1103                         pos = pathmask_to_pos(lpm);
1104                         /* store per path conf_data */
1105                         device->path[pos].conf_data = conf_data;
1106                         device->path[pos].cssid = sch_id.cssid;
1107                         device->path[pos].ssid = sch_id.ssid;
1108                         chp_desc = ccw_device_get_chp_desc(device->cdev, pos);
1109                         if (chp_desc)
1110                                 device->path[pos].chpid = chp_desc->chpid;
1111                         kfree(chp_desc);
1112                         path_private.conf_data = NULL;
1113                         path_private.conf_len = 0;
1114                 }
1115                 switch (dasd_eckd_path_access(conf_data, conf_len)) {
1116                 case 0x02:
1117                         dasd_path_add_nppm(device, lpm);
1118                         break;
1119                 case 0x03:
1120                         dasd_path_add_ppm(device, lpm);
1121                         break;
1122                 }
1123                 if (!dasd_path_get_opm(device)) {
1124                         dasd_path_set_opm(device, lpm);
1125                         dasd_generic_path_operational(device);
1126                 } else {
1127                         dasd_path_add_opm(device, lpm);
1128                 }
1129         }
1130
1131         return path_err;
1132 }
1133
1134 static u32 get_fcx_max_data(struct dasd_device *device)
1135 {
1136         struct dasd_eckd_private *private = device->private;
1137         int fcx_in_css, fcx_in_gneq, fcx_in_features;
1138         int tpm, mdc;
1139
1140         if (dasd_nofcx)
1141                 return 0;
1142         /* is transport mode supported? */
1143         fcx_in_css = css_general_characteristics.fcx;
1144         fcx_in_gneq = private->gneq->reserved2[7] & 0x04;
1145         fcx_in_features = private->features.feature[40] & 0x80;
1146         tpm = fcx_in_css && fcx_in_gneq && fcx_in_features;
1147
1148         if (!tpm)
1149                 return 0;
1150
1151         mdc = ccw_device_get_mdc(device->cdev, 0);
1152         if (mdc < 0) {
1153                 dev_warn(&device->cdev->dev, "Detecting the maximum supported data size for zHPF requests failed\n");
1154                 return 0;
1155         } else {
1156                 return (u32)mdc * FCX_MAX_DATA_FACTOR;
1157         }
1158 }
1159
1160 static int verify_fcx_max_data(struct dasd_device *device, __u8 lpm)
1161 {
1162         struct dasd_eckd_private *private = device->private;
1163         int mdc;
1164         u32 fcx_max_data;
1165
1166         if (private->fcx_max_data) {
1167                 mdc = ccw_device_get_mdc(device->cdev, lpm);
1168                 if ((mdc < 0)) {
1169                         dev_warn(&device->cdev->dev,
1170                                  "Detecting the maximum data size for zHPF "
1171                                  "requests failed (rc=%d) for a new path %x\n",
1172                                  mdc, lpm);
1173                         return mdc;
1174                 }
1175                 fcx_max_data = (u32)mdc * FCX_MAX_DATA_FACTOR;
1176                 if (fcx_max_data < private->fcx_max_data) {
1177                         dev_warn(&device->cdev->dev,
1178                                  "The maximum data size for zHPF requests %u "
1179                                  "on a new path %x is below the active maximum "
1180                                  "%u\n", fcx_max_data, lpm,
1181                                  private->fcx_max_data);
1182                         return -EACCES;
1183                 }
1184         }
1185         return 0;
1186 }
1187
1188 static int rebuild_device_uid(struct dasd_device *device,
1189                               struct path_verification_work_data *data)
1190 {
1191         struct dasd_eckd_private *private = device->private;
1192         __u8 lpm, opm = dasd_path_get_opm(device);
1193         int rc = -ENODEV;
1194
1195         for (lpm = 0x80; lpm; lpm >>= 1) {
1196                 if (!(lpm & opm))
1197                         continue;
1198                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1199                 memset(&data->cqr, 0, sizeof(data->cqr));
1200                 data->cqr.cpaddr = &data->ccw;
1201                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1202                                                      data->rcd_buffer,
1203                                                      lpm);
1204
1205                 if (rc) {
1206                         if (rc == -EOPNOTSUPP) /* -EOPNOTSUPP is ok */
1207                                 continue;
1208                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1209                                         "Read configuration data "
1210                                         "returned error %d", rc);
1211                         break;
1212                 }
1213                 memcpy(private->conf_data, data->rcd_buffer,
1214                        DASD_ECKD_RCD_DATA_SIZE);
1215                 if (dasd_eckd_identify_conf_parts(private)) {
1216                         rc = -ENODEV;
1217                 } else /* first valid path is enough */
1218                         break;
1219         }
1220
1221         if (!rc)
1222                 rc = dasd_eckd_generate_uid(device);
1223
1224         return rc;
1225 }
1226
1227 static void do_path_verification_work(struct work_struct *work)
1228 {
1229         struct path_verification_work_data *data;
1230         struct dasd_device *device;
1231         struct dasd_eckd_private path_private;
1232         struct dasd_uid *uid;
1233         __u8 path_rcd_buf[DASD_ECKD_RCD_DATA_SIZE];
1234         __u8 lpm, opm, npm, ppm, epm, hpfpm, cablepm;
1235         unsigned long flags;
1236         char print_uid[60];
1237         int rc;
1238
1239         data = container_of(work, struct path_verification_work_data, worker);
1240         device = data->device;
1241
1242         /* delay path verification until device was resumed */
1243         if (test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
1244                 schedule_work(work);
1245                 return;
1246         }
1247         /* check if path verification already running and delay if so */
1248         if (test_and_set_bit(DASD_FLAG_PATH_VERIFY, &device->flags)) {
1249                 schedule_work(work);
1250                 return;
1251         }
1252         opm = 0;
1253         npm = 0;
1254         ppm = 0;
1255         epm = 0;
1256         hpfpm = 0;
1257         cablepm = 0;
1258
1259         for (lpm = 0x80; lpm; lpm >>= 1) {
1260                 if (!(lpm & data->tbvpm))
1261                         continue;
1262                 memset(&data->rcd_buffer, 0, sizeof(data->rcd_buffer));
1263                 memset(&data->cqr, 0, sizeof(data->cqr));
1264                 data->cqr.cpaddr = &data->ccw;
1265                 rc = dasd_eckd_read_conf_immediately(device, &data->cqr,
1266                                                      data->rcd_buffer,
1267                                                      lpm);
1268                 if (!rc) {
1269                         switch (dasd_eckd_path_access(data->rcd_buffer,
1270                                                       DASD_ECKD_RCD_DATA_SIZE)
1271                                 ) {
1272                         case 0x02:
1273                                 npm |= lpm;
1274                                 break;
1275                         case 0x03:
1276                                 ppm |= lpm;
1277                                 break;
1278                         }
1279                         opm |= lpm;
1280                 } else if (rc == -EOPNOTSUPP) {
1281                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1282                                         "path verification: No configuration "
1283                                         "data retrieved");
1284                         opm |= lpm;
1285                 } else if (rc == -EAGAIN) {
1286                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1287                                         "path verification: device is stopped,"
1288                                         " try again later");
1289                         epm |= lpm;
1290                 } else {
1291                         dev_warn(&device->cdev->dev,
1292                                  "Reading device feature codes failed "
1293                                  "(rc=%d) for new path %x\n", rc, lpm);
1294                         continue;
1295                 }
1296                 if (verify_fcx_max_data(device, lpm)) {
1297                         opm &= ~lpm;
1298                         npm &= ~lpm;
1299                         ppm &= ~lpm;
1300                         hpfpm |= lpm;
1301                         continue;
1302                 }
1303
1304                 /*
1305                  * save conf_data for comparison after
1306                  * rebuild_device_uid may have changed
1307                  * the original data
1308                  */
1309                 memcpy(&path_rcd_buf, data->rcd_buffer,
1310                        DASD_ECKD_RCD_DATA_SIZE);
1311                 path_private.conf_data = (void *) &path_rcd_buf;
1312                 path_private.conf_len = DASD_ECKD_RCD_DATA_SIZE;
1313                 if (dasd_eckd_identify_conf_parts(&path_private)) {
1314                         path_private.conf_data = NULL;
1315                         path_private.conf_len = 0;
1316                         continue;
1317                 }
1318
1319                 /*
1320                  * compare path UID with device UID only if at least
1321                  * one valid path is left
1322                  * in other case the device UID may have changed and
1323                  * the first working path UID will be used as device UID
1324                  */
1325                 if (dasd_path_get_opm(device) &&
1326                     dasd_eckd_compare_path_uid(device, &path_private)) {
1327                         /*
1328                          * the comparison was not successful
1329                          * rebuild the device UID with at least one
1330                          * known path in case a z/VM hyperswap command
1331                          * has changed the device
1332                          *
1333                          * after this compare again
1334                          *
1335                          * if either the rebuild or the recompare fails
1336                          * the path can not be used
1337                          */
1338                         if (rebuild_device_uid(device, data) ||
1339                             dasd_eckd_compare_path_uid(
1340                                     device, &path_private)) {
1341                                 uid = &path_private.uid;
1342                                 if (strlen(uid->vduit) > 0)
1343                                         snprintf(print_uid, sizeof(print_uid),
1344                                                  "%s.%s.%04x.%02x.%s",
1345                                                  uid->vendor, uid->serial,
1346                                                  uid->ssid, uid->real_unit_addr,
1347                                                  uid->vduit);
1348                                 else
1349                                         snprintf(print_uid, sizeof(print_uid),
1350                                                  "%s.%s.%04x.%02x",
1351                                                  uid->vendor, uid->serial,
1352                                                  uid->ssid,
1353                                                  uid->real_unit_addr);
1354                                 dev_err(&device->cdev->dev,
1355                                         "The newly added channel path %02X "
1356                                         "will not be used because it leads "
1357                                         "to a different device %s\n",
1358                                         lpm, print_uid);
1359                                 opm &= ~lpm;
1360                                 npm &= ~lpm;
1361                                 ppm &= ~lpm;
1362                                 cablepm |= lpm;
1363                                 continue;
1364                         }
1365                 }
1366
1367                 /*
1368                  * There is a small chance that a path is lost again between
1369                  * above path verification and the following modification of
1370                  * the device opm mask. We could avoid that race here by using
1371                  * yet another path mask, but we rather deal with this unlikely
1372                  * situation in dasd_start_IO.
1373                  */
1374                 spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1375                 if (!dasd_path_get_opm(device) && opm) {
1376                         dasd_path_set_opm(device, opm);
1377                         dasd_generic_path_operational(device);
1378                 } else {
1379                         dasd_path_add_opm(device, opm);
1380                 }
1381                 dasd_path_add_nppm(device, npm);
1382                 dasd_path_add_ppm(device, ppm);
1383                 dasd_path_add_tbvpm(device, epm);
1384                 dasd_path_add_cablepm(device, cablepm);
1385                 dasd_path_add_nohpfpm(device, hpfpm);
1386                 spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1387         }
1388         clear_bit(DASD_FLAG_PATH_VERIFY, &device->flags);
1389         dasd_put_device(device);
1390         if (data->isglobal)
1391                 mutex_unlock(&dasd_path_verification_mutex);
1392         else
1393                 kfree(data);
1394 }
1395
1396 static int dasd_eckd_verify_path(struct dasd_device *device, __u8 lpm)
1397 {
1398         struct path_verification_work_data *data;
1399
1400         data = kmalloc(sizeof(*data), GFP_ATOMIC | GFP_DMA);
1401         if (!data) {
1402                 if (mutex_trylock(&dasd_path_verification_mutex)) {
1403                         data = path_verification_worker;
1404                         data->isglobal = 1;
1405                 } else
1406                         return -ENOMEM;
1407         } else {
1408                 memset(data, 0, sizeof(*data));
1409                 data->isglobal = 0;
1410         }
1411         INIT_WORK(&data->worker, do_path_verification_work);
1412         dasd_get_device(device);
1413         data->device = device;
1414         data->tbvpm = lpm;
1415         schedule_work(&data->worker);
1416         return 0;
1417 }
1418
1419 static void dasd_eckd_reset_path(struct dasd_device *device, __u8 pm)
1420 {
1421         struct dasd_eckd_private *private = device->private;
1422         unsigned long flags;
1423
1424         if (!private->fcx_max_data)
1425                 private->fcx_max_data = get_fcx_max_data(device);
1426         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
1427         dasd_path_set_tbvpm(device, pm ? : dasd_path_get_notoperpm(device));
1428         dasd_schedule_device_bh(device);
1429         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
1430 }
1431
1432 static int dasd_eckd_read_features(struct dasd_device *device)
1433 {
1434         struct dasd_eckd_private *private = device->private;
1435         struct dasd_psf_prssd_data *prssdp;
1436         struct dasd_rssd_features *features;
1437         struct dasd_ccw_req *cqr;
1438         struct ccw1 *ccw;
1439         int rc;
1440
1441         memset(&private->features, 0, sizeof(struct dasd_rssd_features));
1442         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
1443                                    (sizeof(struct dasd_psf_prssd_data) +
1444                                     sizeof(struct dasd_rssd_features)),
1445                                    device, NULL);
1446         if (IS_ERR(cqr)) {
1447                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s", "Could not "
1448                                 "allocate initialization request");
1449                 return PTR_ERR(cqr);
1450         }
1451         cqr->startdev = device;
1452         cqr->memdev = device;
1453         cqr->block = NULL;
1454         cqr->retries = 256;
1455         cqr->expires = 10 * HZ;
1456
1457         /* Prepare for Read Subsystem Data */
1458         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1459         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
1460         prssdp->order = PSF_ORDER_PRSSD;
1461         prssdp->suborder = 0x41;        /* Read Feature Codes */
1462         /* all other bytes of prssdp must be zero */
1463
1464         ccw = cqr->cpaddr;
1465         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1466         ccw->count = sizeof(struct dasd_psf_prssd_data);
1467         ccw->flags |= CCW_FLAG_CC;
1468         ccw->cda = (__u32)(addr_t) prssdp;
1469
1470         /* Read Subsystem Data - feature codes */
1471         features = (struct dasd_rssd_features *) (prssdp + 1);
1472         memset(features, 0, sizeof(struct dasd_rssd_features));
1473
1474         ccw++;
1475         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
1476         ccw->count = sizeof(struct dasd_rssd_features);
1477         ccw->cda = (__u32)(addr_t) features;
1478
1479         cqr->buildclk = get_tod_clock();
1480         cqr->status = DASD_CQR_FILLED;
1481         rc = dasd_sleep_on(cqr);
1482         if (rc == 0) {
1483                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
1484                 features = (struct dasd_rssd_features *) (prssdp + 1);
1485                 memcpy(&private->features, features,
1486                        sizeof(struct dasd_rssd_features));
1487         } else
1488                 dev_warn(&device->cdev->dev, "Reading device feature codes"
1489                          " failed with rc=%d\n", rc);
1490         dasd_sfree_request(cqr, cqr->memdev);
1491         return rc;
1492 }
1493
1494
1495 /*
1496  * Build CP for Perform Subsystem Function - SSC.
1497  */
1498 static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
1499                                                     int enable_pav)
1500 {
1501         struct dasd_ccw_req *cqr;
1502         struct dasd_psf_ssc_data *psf_ssc_data;
1503         struct ccw1 *ccw;
1504
1505         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
1506                                   sizeof(struct dasd_psf_ssc_data),
1507                                    device, NULL);
1508
1509         if (IS_ERR(cqr)) {
1510                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
1511                            "Could not allocate PSF-SSC request");
1512                 return cqr;
1513         }
1514         psf_ssc_data = (struct dasd_psf_ssc_data *)cqr->data;
1515         psf_ssc_data->order = PSF_ORDER_SSC;
1516         psf_ssc_data->suborder = 0xc0;
1517         if (enable_pav) {
1518                 psf_ssc_data->suborder |= 0x08;
1519                 psf_ssc_data->reserved[0] = 0x88;
1520         }
1521         ccw = cqr->cpaddr;
1522         ccw->cmd_code = DASD_ECKD_CCW_PSF;
1523         ccw->cda = (__u32)(addr_t)psf_ssc_data;
1524         ccw->count = 66;
1525
1526         cqr->startdev = device;
1527         cqr->memdev = device;
1528         cqr->block = NULL;
1529         cqr->retries = 256;
1530         cqr->expires = 10*HZ;
1531         cqr->buildclk = get_tod_clock();
1532         cqr->status = DASD_CQR_FILLED;
1533         return cqr;
1534 }
1535
1536 /*
1537  * Perform Subsystem Function.
1538  * It is necessary to trigger CIO for channel revalidation since this
1539  * call might change behaviour of DASD devices.
1540  */
1541 static int
1542 dasd_eckd_psf_ssc(struct dasd_device *device, int enable_pav,
1543                   unsigned long flags)
1544 {
1545         struct dasd_ccw_req *cqr;
1546         int rc;
1547
1548         cqr = dasd_eckd_build_psf_ssc(device, enable_pav);
1549         if (IS_ERR(cqr))
1550                 return PTR_ERR(cqr);
1551
1552         /*
1553          * set flags e.g. turn on failfast, to prevent blocking
1554          * the calling function should handle failed requests
1555          */
1556         cqr->flags |= flags;
1557
1558         rc = dasd_sleep_on(cqr);
1559         if (!rc)
1560                 /* trigger CIO to reprobe devices */
1561                 css_schedule_reprobe();
1562         else if (cqr->intrc == -EAGAIN)
1563                 rc = -EAGAIN;
1564
1565         dasd_sfree_request(cqr, cqr->memdev);
1566         return rc;
1567 }
1568
1569 /*
1570  * Valide storage server of current device.
1571  */
1572 static int dasd_eckd_validate_server(struct dasd_device *device,
1573                                      unsigned long flags)
1574 {
1575         struct dasd_eckd_private *private = device->private;
1576         int enable_pav, rc;
1577
1578         if (private->uid.type == UA_BASE_PAV_ALIAS ||
1579             private->uid.type == UA_HYPER_PAV_ALIAS)
1580                 return 0;
1581         if (dasd_nopav || MACHINE_IS_VM)
1582                 enable_pav = 0;
1583         else
1584                 enable_pav = 1;
1585         rc = dasd_eckd_psf_ssc(device, enable_pav, flags);
1586
1587         /* may be requested feature is not available on server,
1588          * therefore just report error and go ahead */
1589         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "PSF-SSC for SSID %04x "
1590                         "returned rc=%d", private->uid.ssid, rc);
1591         return rc;
1592 }
1593
1594 /*
1595  * worker to do a validate server in case of a lost pathgroup
1596  */
1597 static void dasd_eckd_do_validate_server(struct work_struct *work)
1598 {
1599         struct dasd_device *device = container_of(work, struct dasd_device,
1600                                                   kick_validate);
1601         unsigned long flags = 0;
1602
1603         set_bit(DASD_CQR_FLAGS_FAILFAST, &flags);
1604         if (dasd_eckd_validate_server(device, flags)
1605             == -EAGAIN) {
1606                 /* schedule worker again if failed */
1607                 schedule_work(&device->kick_validate);
1608                 return;
1609         }
1610
1611         dasd_put_device(device);
1612 }
1613
1614 static void dasd_eckd_kick_validate_server(struct dasd_device *device)
1615 {
1616         dasd_get_device(device);
1617         /* exit if device not online or in offline processing */
1618         if (test_bit(DASD_FLAG_OFFLINE, &device->flags) ||
1619            device->state < DASD_STATE_ONLINE) {
1620                 dasd_put_device(device);
1621                 return;
1622         }
1623         /* queue call to do_validate_server to the kernel event daemon. */
1624         if (!schedule_work(&device->kick_validate))
1625                 dasd_put_device(device);
1626 }
1627
1628 /*
1629  * Check device characteristics.
1630  * If the device is accessible using ECKD discipline, the device is enabled.
1631  */
1632 static int
1633 dasd_eckd_check_characteristics(struct dasd_device *device)
1634 {
1635         struct dasd_eckd_private *private = device->private;
1636         struct dasd_block *block;
1637         struct dasd_uid temp_uid;
1638         int rc, i;
1639         int readonly;
1640         unsigned long value;
1641
1642         /* setup work queue for validate server*/
1643         INIT_WORK(&device->kick_validate, dasd_eckd_do_validate_server);
1644         /* setup work queue for summary unit check */
1645         INIT_WORK(&device->suc_work, dasd_alias_handle_summary_unit_check);
1646
1647         if (!ccw_device_is_pathgroup(device->cdev)) {
1648                 dev_warn(&device->cdev->dev,
1649                          "A channel path group could not be established\n");
1650                 return -EIO;
1651         }
1652         if (!ccw_device_is_multipath(device->cdev)) {
1653                 dev_info(&device->cdev->dev,
1654                          "The DASD is not operating in multipath mode\n");
1655         }
1656         if (!private) {
1657                 private = kzalloc(sizeof(*private), GFP_KERNEL | GFP_DMA);
1658                 if (!private) {
1659                         dev_warn(&device->cdev->dev,
1660                                  "Allocating memory for private DASD data "
1661                                  "failed\n");
1662                         return -ENOMEM;
1663                 }
1664                 device->private = private;
1665         } else {
1666                 memset(private, 0, sizeof(*private));
1667         }
1668         /* Invalidate status of initial analysis. */
1669         private->init_cqr_status = -1;
1670         /* Set default cache operations. */
1671         private->attrib.operation = DASD_NORMAL_CACHE;
1672         private->attrib.nr_cyl = 0;
1673
1674         /* Read Configuration Data */
1675         rc = dasd_eckd_read_conf(device);
1676         if (rc)
1677                 goto out_err1;
1678
1679         /* set some default values */
1680         device->default_expires = DASD_EXPIRES;
1681         device->default_retries = DASD_RETRIES;
1682         device->path_thrhld = DASD_ECKD_PATH_THRHLD;
1683         device->path_interval = DASD_ECKD_PATH_INTERVAL;
1684
1685         if (private->gneq) {
1686                 value = 1;
1687                 for (i = 0; i < private->gneq->timeout.value; i++)
1688                         value = 10 * value;
1689                 value = value * private->gneq->timeout.number;
1690                 /* do not accept useless values */
1691                 if (value != 0 && value <= DASD_EXPIRES_MAX)
1692                         device->default_expires = value;
1693         }
1694
1695         dasd_eckd_get_uid(device, &temp_uid);
1696         if (temp_uid.type == UA_BASE_DEVICE) {
1697                 block = dasd_alloc_block();
1698                 if (IS_ERR(block)) {
1699                         DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
1700                                         "could not allocate dasd "
1701                                         "block structure");
1702                         rc = PTR_ERR(block);
1703                         goto out_err1;
1704                 }
1705                 device->block = block;
1706                 block->base = device;
1707         }
1708
1709         /* register lcu with alias handling, enable PAV */
1710         rc = dasd_alias_make_device_known_to_lcu(device);
1711         if (rc)
1712                 goto out_err2;
1713
1714         dasd_eckd_validate_server(device, 0);
1715
1716         /* device may report different configuration data after LCU setup */
1717         rc = dasd_eckd_read_conf(device);
1718         if (rc)
1719                 goto out_err3;
1720
1721         /* Read Feature Codes */
1722         dasd_eckd_read_features(device);
1723
1724         /* Read Device Characteristics */
1725         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
1726                                          &private->rdc_data, 64);
1727         if (rc) {
1728                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
1729                                 "Read device characteristic failed, rc=%d", rc);
1730                 goto out_err3;
1731         }
1732
1733         if ((device->features & DASD_FEATURE_USERAW) &&
1734             !(private->rdc_data.facilities.RT_in_LR)) {
1735                 dev_err(&device->cdev->dev, "The storage server does not "
1736                         "support raw-track access\n");
1737                 rc = -EINVAL;
1738                 goto out_err3;
1739         }
1740
1741         /* find the valid cylinder size */
1742         if (private->rdc_data.no_cyl == LV_COMPAT_CYL &&
1743             private->rdc_data.long_no_cyl)
1744                 private->real_cyl = private->rdc_data.long_no_cyl;
1745         else
1746                 private->real_cyl = private->rdc_data.no_cyl;
1747
1748         private->fcx_max_data = get_fcx_max_data(device);
1749
1750         readonly = dasd_device_is_ro(device);
1751         if (readonly)
1752                 set_bit(DASD_FLAG_DEVICE_RO, &device->flags);
1753
1754         dev_info(&device->cdev->dev, "New DASD %04X/%02X (CU %04X/%02X) "
1755                  "with %d cylinders, %d heads, %d sectors%s\n",
1756                  private->rdc_data.dev_type,
1757                  private->rdc_data.dev_model,
1758                  private->rdc_data.cu_type,
1759                  private->rdc_data.cu_model.model,
1760                  private->real_cyl,
1761                  private->rdc_data.trk_per_cyl,
1762                  private->rdc_data.sec_per_trk,
1763                  readonly ? ", read-only device" : "");
1764         return 0;
1765
1766 out_err3:
1767         dasd_alias_disconnect_device_from_lcu(device);
1768 out_err2:
1769         dasd_free_block(device->block);
1770         device->block = NULL;
1771 out_err1:
1772         kfree(private->conf_data);
1773         kfree(device->private);
1774         device->private = NULL;
1775         return rc;
1776 }
1777
1778 static void dasd_eckd_uncheck_device(struct dasd_device *device)
1779 {
1780         struct dasd_eckd_private *private = device->private;
1781         int i;
1782
1783         dasd_alias_disconnect_device_from_lcu(device);
1784         private->ned = NULL;
1785         private->sneq = NULL;
1786         private->vdsneq = NULL;
1787         private->gneq = NULL;
1788         private->conf_len = 0;
1789         for (i = 0; i < 8; i++) {
1790                 kfree(device->path[i].conf_data);
1791                 if ((__u8 *)device->path[i].conf_data ==
1792                     private->conf_data) {
1793                         private->conf_data = NULL;
1794                         private->conf_len = 0;
1795                 }
1796                 device->path[i].conf_data = NULL;
1797                 device->path[i].cssid = 0;
1798                 device->path[i].ssid = 0;
1799                 device->path[i].chpid = 0;
1800         }
1801         kfree(private->conf_data);
1802         private->conf_data = NULL;
1803 }
1804
1805 static struct dasd_ccw_req *
1806 dasd_eckd_analysis_ccw(struct dasd_device *device)
1807 {
1808         struct dasd_eckd_private *private = device->private;
1809         struct eckd_count *count_data;
1810         struct LO_eckd_data *LO_data;
1811         struct dasd_ccw_req *cqr;
1812         struct ccw1 *ccw;
1813         int cplength, datasize;
1814         int i;
1815
1816         cplength = 8;
1817         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
1818         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device,
1819                                    NULL);
1820         if (IS_ERR(cqr))
1821                 return cqr;
1822         ccw = cqr->cpaddr;
1823         /* Define extent for the first 3 tracks. */
1824         define_extent(ccw++, cqr->data, 0, 2,
1825                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1826         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1827         /* Locate record for the first 4 records on track 0. */
1828         ccw[-1].flags |= CCW_FLAG_CC;
1829         locate_record(ccw++, LO_data++, 0, 0, 4,
1830                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1831
1832         count_data = private->count_area;
1833         for (i = 0; i < 4; i++) {
1834                 ccw[-1].flags |= CCW_FLAG_CC;
1835                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1836                 ccw->flags = 0;
1837                 ccw->count = 8;
1838                 ccw->cda = (__u32)(addr_t) count_data;
1839                 ccw++;
1840                 count_data++;
1841         }
1842
1843         /* Locate record for the first record on track 2. */
1844         ccw[-1].flags |= CCW_FLAG_CC;
1845         locate_record(ccw++, LO_data++, 2, 0, 1,
1846                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1847         /* Read count ccw. */
1848         ccw[-1].flags |= CCW_FLAG_CC;
1849         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1850         ccw->flags = 0;
1851         ccw->count = 8;
1852         ccw->cda = (__u32)(addr_t) count_data;
1853
1854         cqr->block = NULL;
1855         cqr->startdev = device;
1856         cqr->memdev = device;
1857         cqr->retries = 255;
1858         cqr->buildclk = get_tod_clock();
1859         cqr->status = DASD_CQR_FILLED;
1860         return cqr;
1861 }
1862
1863 /* differentiate between 'no record found' and any other error */
1864 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1865 {
1866         char *sense;
1867         if (init_cqr->status == DASD_CQR_DONE)
1868                 return INIT_CQR_OK;
1869         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1870                  init_cqr->status == DASD_CQR_FAILED) {
1871                 sense = dasd_get_sense(&init_cqr->irb);
1872                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1873                         return INIT_CQR_UNFORMATTED;
1874                 else
1875                         return INIT_CQR_ERROR;
1876         } else
1877                 return INIT_CQR_ERROR;
1878 }
1879
1880 /*
1881  * This is the callback function for the init_analysis cqr. It saves
1882  * the status of the initial analysis ccw before it frees it and kicks
1883  * the device to continue the startup sequence. This will call
1884  * dasd_eckd_do_analysis again (if the devices has not been marked
1885  * for deletion in the meantime).
1886  */
1887 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1888                                         void *data)
1889 {
1890         struct dasd_device *device = init_cqr->startdev;
1891         struct dasd_eckd_private *private = device->private;
1892
1893         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1894         dasd_sfree_request(init_cqr, device);
1895         dasd_kick_device(device);
1896 }
1897
1898 static int dasd_eckd_start_analysis(struct dasd_block *block)
1899 {
1900         struct dasd_ccw_req *init_cqr;
1901
1902         init_cqr = dasd_eckd_analysis_ccw(block->base);
1903         if (IS_ERR(init_cqr))
1904                 return PTR_ERR(init_cqr);
1905         init_cqr->callback = dasd_eckd_analysis_callback;
1906         init_cqr->callback_data = NULL;
1907         init_cqr->expires = 5*HZ;
1908         /* first try without ERP, so we can later handle unformatted
1909          * devices as special case
1910          */
1911         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1912         init_cqr->retries = 0;
1913         dasd_add_request_head(init_cqr);
1914         return -EAGAIN;
1915 }
1916
1917 static int dasd_eckd_end_analysis(struct dasd_block *block)
1918 {
1919         struct dasd_device *device = block->base;
1920         struct dasd_eckd_private *private = device->private;
1921         struct eckd_count *count_area;
1922         unsigned int sb, blk_per_trk;
1923         int status, i;
1924         struct dasd_ccw_req *init_cqr;
1925
1926         status = private->init_cqr_status;
1927         private->init_cqr_status = -1;
1928         if (status == INIT_CQR_ERROR) {
1929                 /* try again, this time with full ERP */
1930                 init_cqr = dasd_eckd_analysis_ccw(device);
1931                 dasd_sleep_on(init_cqr);
1932                 status = dasd_eckd_analysis_evaluation(init_cqr);
1933                 dasd_sfree_request(init_cqr, device);
1934         }
1935
1936         if (device->features & DASD_FEATURE_USERAW) {
1937                 block->bp_block = DASD_RAW_BLOCKSIZE;
1938                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1939                 block->s2b_shift = 3;
1940                 goto raw;
1941         }
1942
1943         if (status == INIT_CQR_UNFORMATTED) {
1944                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1945                 return -EMEDIUMTYPE;
1946         } else if (status == INIT_CQR_ERROR) {
1947                 dev_err(&device->cdev->dev,
1948                         "Detecting the DASD disk layout failed because "
1949                         "of an I/O error\n");
1950                 return -EIO;
1951         }
1952
1953         private->uses_cdl = 1;
1954         /* Check Track 0 for Compatible Disk Layout */
1955         count_area = NULL;
1956         for (i = 0; i < 3; i++) {
1957                 if (private->count_area[i].kl != 4 ||
1958                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1959                     private->count_area[i].cyl != 0 ||
1960                     private->count_area[i].head != count_area_head[i] ||
1961                     private->count_area[i].record != count_area_rec[i]) {
1962                         private->uses_cdl = 0;
1963                         break;
1964                 }
1965         }
1966         if (i == 3)
1967                 count_area = &private->count_area[4];
1968
1969         if (private->uses_cdl == 0) {
1970                 for (i = 0; i < 5; i++) {
1971                         if ((private->count_area[i].kl != 0) ||
1972                             (private->count_area[i].dl !=
1973                              private->count_area[0].dl) ||
1974                             private->count_area[i].cyl !=  0 ||
1975                             private->count_area[i].head != count_area_head[i] ||
1976                             private->count_area[i].record != count_area_rec[i])
1977                                 break;
1978                 }
1979                 if (i == 5)
1980                         count_area = &private->count_area[0];
1981         } else {
1982                 if (private->count_area[3].record == 1)
1983                         dev_warn(&device->cdev->dev,
1984                                  "Track 0 has no records following the VTOC\n");
1985         }
1986
1987         if (count_area != NULL && count_area->kl == 0) {
1988                 /* we found notthing violating our disk layout */
1989                 if (dasd_check_blocksize(count_area->dl) == 0)
1990                         block->bp_block = count_area->dl;
1991         }
1992         if (block->bp_block == 0) {
1993                 dev_warn(&device->cdev->dev,
1994                          "The disk layout of the DASD is not supported\n");
1995                 return -EMEDIUMTYPE;
1996         }
1997         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1998         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1999                 block->s2b_shift++;
2000
2001         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2002
2003 raw:
2004         block->blocks = (private->real_cyl *
2005                           private->rdc_data.trk_per_cyl *
2006                           blk_per_trk);
2007
2008         dev_info(&device->cdev->dev,
2009                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2010                  "%s\n", (block->bp_block >> 10),
2011                  ((private->real_cyl *
2012                    private->rdc_data.trk_per_cyl *
2013                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2014                  ((blk_per_trk * block->bp_block) >> 10),
2015                  private->uses_cdl ?
2016                  "compatible disk layout" : "linux disk layout");
2017
2018         return 0;
2019 }
2020
2021 static int dasd_eckd_do_analysis(struct dasd_block *block)
2022 {
2023         struct dasd_eckd_private *private = block->base->private;
2024
2025         if (private->init_cqr_status < 0)
2026                 return dasd_eckd_start_analysis(block);
2027         else
2028                 return dasd_eckd_end_analysis(block);
2029 }
2030
2031 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2032 {
2033         return dasd_alias_add_device(device);
2034 };
2035
2036 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2037 {
2038         cancel_work_sync(&device->reload_device);
2039         cancel_work_sync(&device->kick_validate);
2040         return 0;
2041 };
2042
2043 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2044 {
2045         return dasd_alias_remove_device(device);
2046 };
2047
2048 static int
2049 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2050 {
2051         struct dasd_eckd_private *private = block->base->private;
2052
2053         if (dasd_check_blocksize(block->bp_block) == 0) {
2054                 geo->sectors = recs_per_track(&private->rdc_data,
2055                                               0, block->bp_block);
2056         }
2057         geo->cylinders = private->rdc_data.no_cyl;
2058         geo->heads = private->rdc_data.trk_per_cyl;
2059         return 0;
2060 }
2061
2062 /*
2063  * Build the TCW request for the format check
2064  */
2065 static struct dasd_ccw_req *
2066 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2067                           int enable_pav, struct eckd_count *fmt_buffer,
2068                           int rpt)
2069 {
2070         struct dasd_eckd_private *start_priv;
2071         struct dasd_device *startdev = NULL;
2072         struct tidaw *last_tidaw = NULL;
2073         struct dasd_ccw_req *cqr;
2074         struct itcw *itcw;
2075         int itcw_size;
2076         int count;
2077         int rc;
2078         int i;
2079
2080         if (enable_pav)
2081                 startdev = dasd_alias_get_start_dev(base);
2082
2083         if (!startdev)
2084                 startdev = base;
2085
2086         start_priv = startdev->private;
2087
2088         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2089
2090         /*
2091          * we're adding 'count' amount of tidaw to the itcw.
2092          * calculate the corresponding itcw_size
2093          */
2094         itcw_size = itcw_calc_size(0, count, 0);
2095
2096         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
2097                                    NULL);
2098         if (IS_ERR(cqr))
2099                 return cqr;
2100
2101         start_priv->count++;
2102
2103         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2104         if (IS_ERR(itcw)) {
2105                 rc = -EINVAL;
2106                 goto out_err;
2107         }
2108
2109         cqr->cpaddr = itcw_get_tcw(itcw);
2110         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2111                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2112                           sizeof(struct eckd_count),
2113                           count * sizeof(struct eckd_count), 0, rpt);
2114         if (rc)
2115                 goto out_err;
2116
2117         for (i = 0; i < count; i++) {
2118                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2119                                             sizeof(struct eckd_count));
2120                 if (IS_ERR(last_tidaw)) {
2121                         rc = -EINVAL;
2122                         goto out_err;
2123                 }
2124         }
2125
2126         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2127         itcw_finalize(itcw);
2128
2129         cqr->cpmode = 1;
2130         cqr->startdev = startdev;
2131         cqr->memdev = startdev;
2132         cqr->basedev = base;
2133         cqr->retries = startdev->default_retries;
2134         cqr->expires = startdev->default_expires * HZ;
2135         cqr->buildclk = get_tod_clock();
2136         cqr->status = DASD_CQR_FILLED;
2137         /* Set flags to suppress output for expected errors */
2138         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2139         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2140
2141         return cqr;
2142
2143 out_err:
2144         dasd_sfree_request(cqr, startdev);
2145
2146         return ERR_PTR(rc);
2147 }
2148
2149 /*
2150  * Build the CCW request for the format check
2151  */
2152 static struct dasd_ccw_req *
2153 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2154                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2155 {
2156         struct dasd_eckd_private *start_priv;
2157         struct dasd_eckd_private *base_priv;
2158         struct dasd_device *startdev = NULL;
2159         struct dasd_ccw_req *cqr;
2160         struct ccw1 *ccw;
2161         void *data;
2162         int cplength, datasize;
2163         int use_prefix;
2164         int count;
2165         int i;
2166
2167         if (enable_pav)
2168                 startdev = dasd_alias_get_start_dev(base);
2169
2170         if (!startdev)
2171                 startdev = base;
2172
2173         start_priv = startdev->private;
2174         base_priv = base->private;
2175
2176         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2177
2178         use_prefix = base_priv->features.feature[8] & 0x01;
2179
2180         if (use_prefix) {
2181                 cplength = 1;
2182                 datasize = sizeof(struct PFX_eckd_data);
2183         } else {
2184                 cplength = 2;
2185                 datasize = sizeof(struct DE_eckd_data) +
2186                         sizeof(struct LO_eckd_data);
2187         }
2188         cplength += count;
2189
2190         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2191                                    startdev, NULL);
2192         if (IS_ERR(cqr))
2193                 return cqr;
2194
2195         start_priv->count++;
2196         data = cqr->data;
2197         ccw = cqr->cpaddr;
2198
2199         if (use_prefix) {
2200                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2201                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2202                            count, 0, 0);
2203         } else {
2204                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2205                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2206
2207                 data += sizeof(struct DE_eckd_data);
2208                 ccw[-1].flags |= CCW_FLAG_CC;
2209
2210                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2211                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2212         }
2213
2214         for (i = 0; i < count; i++) {
2215                 ccw[-1].flags |= CCW_FLAG_CC;
2216                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2217                 ccw->flags = CCW_FLAG_SLI;
2218                 ccw->count = 8;
2219                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2220                 ccw++;
2221                 fmt_buffer++;
2222         }
2223
2224         cqr->startdev = startdev;
2225         cqr->memdev = startdev;
2226         cqr->basedev = base;
2227         cqr->retries = DASD_RETRIES;
2228         cqr->expires = startdev->default_expires * HZ;
2229         cqr->buildclk = get_tod_clock();
2230         cqr->status = DASD_CQR_FILLED;
2231         /* Set flags to suppress output for expected errors */
2232         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2233
2234         return cqr;
2235 }
2236
2237 static struct dasd_ccw_req *
2238 dasd_eckd_build_format(struct dasd_device *base,
2239                        struct format_data_t *fdata,
2240                        int enable_pav)
2241 {
2242         struct dasd_eckd_private *base_priv;
2243         struct dasd_eckd_private *start_priv;
2244         struct dasd_device *startdev = NULL;
2245         struct dasd_ccw_req *fcp;
2246         struct eckd_count *ect;
2247         struct ch_t address;
2248         struct ccw1 *ccw;
2249         void *data;
2250         int rpt;
2251         int cplength, datasize;
2252         int i, j;
2253         int intensity = 0;
2254         int r0_perm;
2255         int nr_tracks;
2256         int use_prefix;
2257
2258         if (enable_pav)
2259                 startdev = dasd_alias_get_start_dev(base);
2260
2261         if (!startdev)
2262                 startdev = base;
2263
2264         start_priv = startdev->private;
2265         base_priv = base->private;
2266
2267         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2268
2269         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2270
2271         /*
2272          * fdata->intensity is a bit string that tells us what to do:
2273          *   Bit 0: write record zero
2274          *   Bit 1: write home address, currently not supported
2275          *   Bit 2: invalidate tracks
2276          *   Bit 3: use OS/390 compatible disk layout (cdl)
2277          *   Bit 4: do not allow storage subsystem to modify record zero
2278          * Only some bit combinations do make sense.
2279          */
2280         if (fdata->intensity & 0x10) {
2281                 r0_perm = 0;
2282                 intensity = fdata->intensity & ~0x10;
2283         } else {
2284                 r0_perm = 1;
2285                 intensity = fdata->intensity;
2286         }
2287
2288         use_prefix = base_priv->features.feature[8] & 0x01;
2289
2290         switch (intensity) {
2291         case 0x00:      /* Normal format */
2292         case 0x08:      /* Normal format, use cdl. */
2293                 cplength = 2 + (rpt*nr_tracks);
2294                 if (use_prefix)
2295                         datasize = sizeof(struct PFX_eckd_data) +
2296                                 sizeof(struct LO_eckd_data) +
2297                                 rpt * nr_tracks * sizeof(struct eckd_count);
2298                 else
2299                         datasize = sizeof(struct DE_eckd_data) +
2300                                 sizeof(struct LO_eckd_data) +
2301                                 rpt * nr_tracks * sizeof(struct eckd_count);
2302                 break;
2303         case 0x01:      /* Write record zero and format track. */
2304         case 0x09:      /* Write record zero and format track, use cdl. */
2305                 cplength = 2 + rpt * nr_tracks;
2306                 if (use_prefix)
2307                         datasize = sizeof(struct PFX_eckd_data) +
2308                                 sizeof(struct LO_eckd_data) +
2309                                 sizeof(struct eckd_count) +
2310                                 rpt * nr_tracks * sizeof(struct eckd_count);
2311                 else
2312                         datasize = sizeof(struct DE_eckd_data) +
2313                                 sizeof(struct LO_eckd_data) +
2314                                 sizeof(struct eckd_count) +
2315                                 rpt * nr_tracks * sizeof(struct eckd_count);
2316                 break;
2317         case 0x04:      /* Invalidate track. */
2318         case 0x0c:      /* Invalidate track, use cdl. */
2319                 cplength = 3;
2320                 if (use_prefix)
2321                         datasize = sizeof(struct PFX_eckd_data) +
2322                                 sizeof(struct LO_eckd_data) +
2323                                 sizeof(struct eckd_count);
2324                 else
2325                         datasize = sizeof(struct DE_eckd_data) +
2326                                 sizeof(struct LO_eckd_data) +
2327                                 sizeof(struct eckd_count);
2328                 break;
2329         default:
2330                 dev_warn(&startdev->cdev->dev,
2331                          "An I/O control call used incorrect flags 0x%x\n",
2332                          fdata->intensity);
2333                 return ERR_PTR(-EINVAL);
2334         }
2335         /* Allocate the format ccw request. */
2336         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2337                                    datasize, startdev, NULL);
2338         if (IS_ERR(fcp))
2339                 return fcp;
2340
2341         start_priv->count++;
2342         data = fcp->data;
2343         ccw = fcp->cpaddr;
2344
2345         switch (intensity & ~0x08) {
2346         case 0x00: /* Normal format. */
2347                 if (use_prefix) {
2348                         prefix(ccw++, (struct PFX_eckd_data *) data,
2349                                fdata->start_unit, fdata->stop_unit,
2350                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2351                         /* grant subsystem permission to format R0 */
2352                         if (r0_perm)
2353                                 ((struct PFX_eckd_data *)data)
2354                                         ->define_extent.ga_extended |= 0x04;
2355                         data += sizeof(struct PFX_eckd_data);
2356                 } else {
2357                         define_extent(ccw++, (struct DE_eckd_data *) data,
2358                                       fdata->start_unit, fdata->stop_unit,
2359                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2360                         /* grant subsystem permission to format R0 */
2361                         if (r0_perm)
2362                                 ((struct DE_eckd_data *) data)
2363                                         ->ga_extended |= 0x04;
2364                         data += sizeof(struct DE_eckd_data);
2365                 }
2366                 ccw[-1].flags |= CCW_FLAG_CC;
2367                 locate_record(ccw++, (struct LO_eckd_data *) data,
2368                               fdata->start_unit, 0, rpt*nr_tracks,
2369                               DASD_ECKD_CCW_WRITE_CKD, base,
2370                               fdata->blksize);
2371                 data += sizeof(struct LO_eckd_data);
2372                 break;
2373         case 0x01: /* Write record zero + format track. */
2374                 if (use_prefix) {
2375                         prefix(ccw++, (struct PFX_eckd_data *) data,
2376                                fdata->start_unit, fdata->stop_unit,
2377                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2378                                base, startdev);
2379                         data += sizeof(struct PFX_eckd_data);
2380                 } else {
2381                         define_extent(ccw++, (struct DE_eckd_data *) data,
2382                                fdata->start_unit, fdata->stop_unit,
2383                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2384                         data += sizeof(struct DE_eckd_data);
2385                 }
2386                 ccw[-1].flags |= CCW_FLAG_CC;
2387                 locate_record(ccw++, (struct LO_eckd_data *) data,
2388                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2389                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2390                               base->block->bp_block);
2391                 data += sizeof(struct LO_eckd_data);
2392                 break;
2393         case 0x04: /* Invalidate track. */
2394                 if (use_prefix) {
2395                         prefix(ccw++, (struct PFX_eckd_data *) data,
2396                                fdata->start_unit, fdata->stop_unit,
2397                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2398                         data += sizeof(struct PFX_eckd_data);
2399                 } else {
2400                         define_extent(ccw++, (struct DE_eckd_data *) data,
2401                                fdata->start_unit, fdata->stop_unit,
2402                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2403                         data += sizeof(struct DE_eckd_data);
2404                 }
2405                 ccw[-1].flags |= CCW_FLAG_CC;
2406                 locate_record(ccw++, (struct LO_eckd_data *) data,
2407                               fdata->start_unit, 0, 1,
2408                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2409                 data += sizeof(struct LO_eckd_data);
2410                 break;
2411         }
2412
2413         for (j = 0; j < nr_tracks; j++) {
2414                 /* calculate cylinder and head for the current track */
2415                 set_ch_t(&address,
2416                          (fdata->start_unit + j) /
2417                          base_priv->rdc_data.trk_per_cyl,
2418                          (fdata->start_unit + j) %
2419                          base_priv->rdc_data.trk_per_cyl);
2420                 if (intensity & 0x01) { /* write record zero */
2421                         ect = (struct eckd_count *) data;
2422                         data += sizeof(struct eckd_count);
2423                         ect->cyl = address.cyl;
2424                         ect->head = address.head;
2425                         ect->record = 0;
2426                         ect->kl = 0;
2427                         ect->dl = 8;
2428                         ccw[-1].flags |= CCW_FLAG_CC;
2429                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2430                         ccw->flags = CCW_FLAG_SLI;
2431                         ccw->count = 8;
2432                         ccw->cda = (__u32)(addr_t) ect;
2433                         ccw++;
2434                 }
2435                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2436                         ect = (struct eckd_count *) data;
2437                         data += sizeof(struct eckd_count);
2438                         ect->cyl = address.cyl;
2439                         ect->head = address.head;
2440                         ect->record = 1;
2441                         ect->kl = 0;
2442                         ect->dl = 0;
2443                         ccw[-1].flags |= CCW_FLAG_CC;
2444                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2445                         ccw->flags = CCW_FLAG_SLI;
2446                         ccw->count = 8;
2447                         ccw->cda = (__u32)(addr_t) ect;
2448                 } else {                /* write remaining records */
2449                         for (i = 0; i < rpt; i++) {
2450                                 ect = (struct eckd_count *) data;
2451                                 data += sizeof(struct eckd_count);
2452                                 ect->cyl = address.cyl;
2453                                 ect->head = address.head;
2454                                 ect->record = i + 1;
2455                                 ect->kl = 0;
2456                                 ect->dl = fdata->blksize;
2457                                 /*
2458                                  * Check for special tracks 0-1
2459                                  * when formatting CDL
2460                                  */
2461                                 if ((intensity & 0x08) &&
2462                                     address.cyl == 0 && address.head == 0) {
2463                                         if (i < 3) {
2464                                                 ect->kl = 4;
2465                                                 ect->dl = sizes_trk0[i] - 4;
2466                                         }
2467                                 }
2468                                 if ((intensity & 0x08) &&
2469                                     address.cyl == 0 && address.head == 1) {
2470                                         ect->kl = 44;
2471                                         ect->dl = LABEL_SIZE - 44;
2472                                 }
2473                                 ccw[-1].flags |= CCW_FLAG_CC;
2474                                 if (i != 0 || j == 0)
2475                                         ccw->cmd_code =
2476                                                 DASD_ECKD_CCW_WRITE_CKD;
2477                                 else
2478                                         ccw->cmd_code =
2479                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2480                                 ccw->flags = CCW_FLAG_SLI;
2481                                 ccw->count = 8;
2482                                 ccw->cda = (__u32)(addr_t) ect;
2483                                 ccw++;
2484                         }
2485                 }
2486         }
2487
2488         fcp->startdev = startdev;
2489         fcp->memdev = startdev;
2490         fcp->basedev = base;
2491         fcp->retries = 256;
2492         fcp->expires = startdev->default_expires * HZ;
2493         fcp->buildclk = get_tod_clock();
2494         fcp->status = DASD_CQR_FILLED;
2495
2496         return fcp;
2497 }
2498
2499 /*
2500  * Wrapper function to build a CCW request depending on input data
2501  */
2502 static struct dasd_ccw_req *
2503 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2504                                struct format_data_t *fdata, int enable_pav,
2505                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2506 {
2507         struct dasd_ccw_req *ccw_req;
2508
2509         if (!fmt_buffer) {
2510                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2511         } else {
2512                 if (tpm)
2513                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2514                                                             enable_pav,
2515                                                             fmt_buffer, rpt);
2516                 else
2517                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2518                                                         fmt_buffer, rpt);
2519         }
2520
2521         return ccw_req;
2522 }
2523
2524 /*
2525  * Sanity checks on format_data
2526  */
2527 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2528                                           struct format_data_t *fdata)
2529 {
2530         struct dasd_eckd_private *private = base->private;
2531
2532         if (fdata->start_unit >=
2533             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2534                 dev_warn(&base->cdev->dev,
2535                          "Start track number %u used in formatting is too big\n",
2536                          fdata->start_unit);
2537                 return -EINVAL;
2538         }
2539         if (fdata->stop_unit >=
2540             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2541                 dev_warn(&base->cdev->dev,
2542                          "Stop track number %u used in formatting is too big\n",
2543                          fdata->stop_unit);
2544                 return -EINVAL;
2545         }
2546         if (fdata->start_unit > fdata->stop_unit) {
2547                 dev_warn(&base->cdev->dev,
2548                          "Start track %u used in formatting exceeds end track\n",
2549                          fdata->start_unit);
2550                 return -EINVAL;
2551         }
2552         if (dasd_check_blocksize(fdata->blksize) != 0) {
2553                 dev_warn(&base->cdev->dev,
2554                          "The DASD cannot be formatted with block size %u\n",
2555                          fdata->blksize);
2556                 return -EINVAL;
2557         }
2558         return 0;
2559 }
2560
2561 /*
2562  * This function will process format_data originally coming from an IOCTL
2563  */
2564 static int dasd_eckd_format_process_data(struct dasd_device *base,
2565                                          struct format_data_t *fdata,
2566                                          int enable_pav, int tpm,
2567                                          struct eckd_count *fmt_buffer, int rpt,
2568                                          struct irb *irb)
2569 {
2570         struct dasd_eckd_private *private = base->private;
2571         struct dasd_ccw_req *cqr, *n;
2572         struct list_head format_queue;
2573         struct dasd_device *device;
2574         char *sense = NULL;
2575         int old_start, old_stop, format_step;
2576         int step, retry;
2577         int rc;
2578
2579         rc = dasd_eckd_format_sanity_checks(base, fdata);
2580         if (rc)
2581                 return rc;
2582
2583         INIT_LIST_HEAD(&format_queue);
2584
2585         old_start = fdata->start_unit;
2586         old_stop = fdata->stop_unit;
2587
2588         if (!tpm && fmt_buffer != NULL) {
2589                 /* Command Mode / Format Check */
2590                 format_step = 1;
2591         } else if (tpm && fmt_buffer != NULL) {
2592                 /* Transport Mode / Format Check */
2593                 format_step = DASD_CQR_MAX_CCW / rpt;
2594         } else {
2595                 /* Normal Formatting */
2596                 format_step = DASD_CQR_MAX_CCW /
2597                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2598         }
2599
2600         do {
2601                 retry = 0;
2602                 while (fdata->start_unit <= old_stop) {
2603                         step = fdata->stop_unit - fdata->start_unit + 1;
2604                         if (step > format_step) {
2605                                 fdata->stop_unit =
2606                                         fdata->start_unit + format_step - 1;
2607                         }
2608
2609                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2610                                                              enable_pav, tpm,
2611                                                              fmt_buffer, rpt);
2612                         if (IS_ERR(cqr)) {
2613                                 rc = PTR_ERR(cqr);
2614                                 if (rc == -ENOMEM) {
2615                                         if (list_empty(&format_queue))
2616                                                 goto out;
2617                                         /*
2618                                          * not enough memory available, start
2619                                          * requests retry after first requests
2620                                          * were finished
2621                                          */
2622                                         retry = 1;
2623                                         break;
2624                                 }
2625                                 goto out_err;
2626                         }
2627                         list_add_tail(&cqr->blocklist, &format_queue);
2628
2629                         if (fmt_buffer) {
2630                                 step = fdata->stop_unit - fdata->start_unit + 1;
2631                                 fmt_buffer += rpt * step;
2632                         }
2633                         fdata->start_unit = fdata->stop_unit + 1;
2634                         fdata->stop_unit = old_stop;
2635                 }
2636
2637                 rc = dasd_sleep_on_queue(&format_queue);
2638
2639 out_err:
2640                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2641                         device = cqr->startdev;
2642                         private = device->private;
2643
2644                         if (cqr->status == DASD_CQR_FAILED) {
2645                                 /*
2646                                  * Only get sense data if called by format
2647                                  * check
2648                                  */
2649                                 if (fmt_buffer && irb) {
2650                                         sense = dasd_get_sense(&cqr->irb);
2651                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2652                                 }
2653                                 rc = -EIO;
2654                         }
2655                         list_del_init(&cqr->blocklist);
2656                         dasd_sfree_request(cqr, device);
2657                         private->count--;
2658                 }
2659
2660                 if (rc && rc != -EIO)
2661                         goto out;
2662                 if (rc == -EIO) {
2663                         /*
2664                          * In case fewer than the expected records are on the
2665                          * track, we will most likely get a 'No Record Found'
2666                          * error (in command mode) or a 'File Protected' error
2667                          * (in transport mode). Those particular cases shouldn't
2668                          * pass the -EIO to the IOCTL, therefore reset the rc
2669                          * and continue.
2670                          */
2671                         if (sense &&
2672                             (sense[1] & SNS1_NO_REC_FOUND ||
2673                              sense[1] & SNS1_FILE_PROTECTED))
2674                                 retry = 1;
2675                         else
2676                                 goto out;
2677                 }
2678
2679         } while (retry);
2680
2681 out:
2682         fdata->start_unit = old_start;
2683         fdata->stop_unit = old_stop;
2684
2685         return rc;
2686 }
2687
2688 static int dasd_eckd_format_device(struct dasd_device *base,
2689                                    struct format_data_t *fdata, int enable_pav)
2690 {
2691         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2692                                              0, NULL);
2693 }
2694
2695 /*
2696  * Helper function to count consecutive records of a single track.
2697  */
2698 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2699                                    int max)
2700 {
2701         int head;
2702         int i;
2703
2704         head = fmt_buffer[start].head;
2705
2706         /*
2707          * There are 3 conditions where we stop counting:
2708          * - if data reoccurs (same head and record may reoccur), which may
2709          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2710          * - when the head changes, because we're iterating over several tracks
2711          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2712          * - when we've reached the end of sensible data in the buffer (the
2713          *   record will be 0 then)
2714          */
2715         for (i = start; i < max; i++) {
2716                 if (i > start) {
2717                         if ((fmt_buffer[i].head == head &&
2718                             fmt_buffer[i].record == 1) ||
2719                             fmt_buffer[i].head != head ||
2720                             fmt_buffer[i].record == 0)
2721                                 break;
2722                 }
2723         }
2724
2725         return i - start;
2726 }
2727
2728 /*
2729  * Evaluate a given range of tracks. Data like number of records, blocksize,
2730  * record ids, and key length are compared with expected data.
2731  *
2732  * If a mismatch occurs, the corresponding error bit is set, as well as
2733  * additional information, depending on the error.
2734  */
2735 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2736                                              struct format_check_t *cdata,
2737                                              int rpt_max, int rpt_exp,
2738                                              int trk_per_cyl, int tpm)
2739 {
2740         struct ch_t geo;
2741         int max_entries;
2742         int count = 0;
2743         int trkcount;
2744         int blksize;
2745         int pos = 0;
2746         int i, j;
2747         int kl;
2748
2749         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2750         max_entries = trkcount * rpt_max;
2751
2752         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2753                 /* Calculate the correct next starting position in the buffer */
2754                 if (tpm) {
2755                         while (fmt_buffer[pos].record == 0 &&
2756                                fmt_buffer[pos].dl == 0) {
2757                                 if (pos++ > max_entries)
2758                                         break;
2759                         }
2760                 } else {
2761                         if (i != cdata->expect.start_unit)
2762                                 pos += rpt_max - count;
2763                 }
2764
2765                 /* Calculate the expected geo values for the current track */
2766                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2767
2768                 /* Count and check number of records */
2769                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2770
2771                 if (count < rpt_exp) {
2772                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2773                         break;
2774                 }
2775                 if (count > rpt_exp) {
2776                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2777                         break;
2778                 }
2779
2780                 for (j = 0; j < count; j++, pos++) {
2781                         blksize = cdata->expect.blksize;
2782                         kl = 0;
2783
2784                         /*
2785                          * Set special values when checking CDL formatted
2786                          * devices.
2787                          */
2788                         if ((cdata->expect.intensity & 0x08) &&
2789                             geo.cyl == 0 && geo.head == 0) {
2790                                 if (j < 3) {
2791                                         blksize = sizes_trk0[j] - 4;
2792                                         kl = 4;
2793                                 }
2794                         }
2795                         if ((cdata->expect.intensity & 0x08) &&
2796                             geo.cyl == 0 && geo.head == 1) {
2797                                 blksize = LABEL_SIZE - 44;
2798                                 kl = 44;
2799                         }
2800
2801                         /* Check blocksize */
2802                         if (fmt_buffer[pos].dl != blksize) {
2803                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2804                                 goto out;
2805                         }
2806                         /* Check if key length is 0 */
2807                         if (fmt_buffer[pos].kl != kl) {
2808                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2809                                 goto out;
2810                         }
2811                         /* Check if record_id is correct */
2812                         if (fmt_buffer[pos].cyl != geo.cyl ||
2813                             fmt_buffer[pos].head != geo.head ||
2814                             fmt_buffer[pos].record != (j + 1)) {
2815                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2816                                 goto out;
2817                         }
2818                 }
2819         }
2820
2821 out:
2822         /*
2823          * In case of no errors, we need to decrease by one
2824          * to get the correct positions.
2825          */
2826         if (!cdata->result) {
2827                 i--;
2828                 pos--;
2829         }
2830
2831         cdata->unit = i;
2832         cdata->num_records = count;
2833         cdata->rec = fmt_buffer[pos].record;
2834         cdata->blksize = fmt_buffer[pos].dl;
2835         cdata->key_length = fmt_buffer[pos].kl;
2836 }
2837
2838 /*
2839  * Check the format of a range of tracks of a DASD.
2840  */
2841 static int dasd_eckd_check_device_format(struct dasd_device *base,
2842                                          struct format_check_t *cdata,
2843                                          int enable_pav)
2844 {
2845         struct dasd_eckd_private *private = base->private;
2846         struct eckd_count *fmt_buffer;
2847         struct irb irb;
2848         int rpt_max, rpt_exp;
2849         int fmt_buffer_size;
2850         int trk_per_cyl;
2851         int trkcount;
2852         int tpm = 0;
2853         int rc;
2854
2855         trk_per_cyl = private->rdc_data.trk_per_cyl;
2856
2857         /* Get maximum and expected amount of records per track */
2858         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2859         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2860
2861         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2862         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2863
2864         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2865         if (!fmt_buffer)
2866                 return -ENOMEM;
2867
2868         /*
2869          * A certain FICON feature subset is needed to operate in transport
2870          * mode. Additionally, the support for transport mode is implicitly
2871          * checked by comparing the buffer size with fcx_max_data. As long as
2872          * the buffer size is smaller we can operate in transport mode and
2873          * process multiple tracks. If not, only one track at once is being
2874          * processed using command mode.
2875          */
2876         if ((private->features.feature[40] & 0x04) &&
2877             fmt_buffer_size <= private->fcx_max_data)
2878                 tpm = 1;
2879
2880         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2881                                            tpm, fmt_buffer, rpt_max, &irb);
2882         if (rc && rc != -EIO)
2883                 goto out;
2884         if (rc == -EIO) {
2885                 /*
2886                  * If our first attempt with transport mode enabled comes back
2887                  * with an incorrect length error, we're going to retry the
2888                  * check with command mode.
2889                  */
2890                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2891                         tpm = 0;
2892                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2893                                                            enable_pav, tpm,
2894                                                            fmt_buffer, rpt_max,
2895                                                            &irb);
2896                         if (rc)
2897                                 goto out;
2898                 } else {
2899                         goto out;
2900                 }
2901         }
2902
2903         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2904                                          trk_per_cyl, tpm);
2905
2906 out:
2907         kfree(fmt_buffer);
2908
2909         return rc;
2910 }
2911
2912 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2913 {
2914         if (cqr->retries < 0) {
2915                 cqr->status = DASD_CQR_FAILED;
2916                 return;
2917         }
2918         cqr->status = DASD_CQR_FILLED;
2919         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2920                 dasd_eckd_reset_ccw_to_base_io(cqr);
2921                 cqr->startdev = cqr->block->base;
2922                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2923         }
2924 };
2925
2926 static dasd_erp_fn_t
2927 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2928 {
2929         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2930         struct ccw_device *cdev = device->cdev;
2931
2932         switch (cdev->id.cu_type) {
2933         case 0x3990:
2934         case 0x2105:
2935         case 0x2107:
2936         case 0x1750:
2937                 return dasd_3990_erp_action;
2938         case 0x9343:
2939         case 0x3880:
2940         default:
2941                 return dasd_default_erp_action;
2942         }
2943 }
2944
2945 static dasd_erp_fn_t
2946 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2947 {
2948         return dasd_default_erp_postaction;
2949 }
2950
2951 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2952                                               struct dasd_ccw_req *cqr,
2953                                               struct irb *irb)
2954 {
2955         char mask;
2956         char *sense = NULL;
2957         struct dasd_eckd_private *private = device->private;
2958
2959         /* first of all check for state change pending interrupt */
2960         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2961         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2962                 /*
2963                  * for alias only, not in offline processing
2964                  * and only if not suspended
2965                  */
2966                 if (!device->block && private->lcu &&
2967                     device->state == DASD_STATE_ONLINE &&
2968                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2969                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2970                         /* schedule worker to reload device */
2971                         dasd_reload_device(device);
2972                 }
2973                 dasd_generic_handle_state_change(device);
2974                 return;
2975         }
2976
2977         sense = dasd_get_sense(irb);
2978         if (!sense)
2979                 return;
2980
2981         /* summary unit check */
2982         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2983             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2984                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2985                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2986                                       "eckd suc: device already notified");
2987                         return;
2988                 }
2989                 sense = dasd_get_sense(irb);
2990                 if (!sense) {
2991                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2992                                       "eckd suc: no reason code available");
2993                         clear_bit(DASD_FLAG_SUC, &device->flags);
2994                         return;
2995
2996                 }
2997                 private->suc_reason = sense[8];
2998                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
2999                               "eckd handle summary unit check: reason",
3000                               private->suc_reason);
3001                 dasd_get_device(device);
3002                 if (!schedule_work(&device->suc_work))
3003                         dasd_put_device(device);
3004
3005                 return;
3006         }
3007
3008         /* service information message SIM */
3009         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3010             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3011                 dasd_3990_erp_handle_sim(device, sense);
3012                 return;
3013         }
3014
3015         /* loss of device reservation is handled via base devices only
3016          * as alias devices may be used with several bases
3017          */
3018         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3019             (sense[7] == 0x3F) &&
3020             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3021             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3022                 if (device->features & DASD_FEATURE_FAILONSLCK)
3023                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3024                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3025                 dev_err(&device->cdev->dev,
3026                         "The device reservation was lost\n");
3027         }
3028 }
3029
3030 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3031                                                struct dasd_device *startdev,
3032                                                struct dasd_block *block,
3033                                                struct request *req,
3034                                                sector_t first_rec,
3035                                                sector_t last_rec,
3036                                                sector_t first_trk,
3037                                                sector_t last_trk,
3038                                                unsigned int first_offs,
3039                                                unsigned int last_offs,
3040                                                unsigned int blk_per_trk,
3041                                                unsigned int blksize)
3042 {
3043         struct dasd_eckd_private *private;
3044         unsigned long *idaws;
3045         struct LO_eckd_data *LO_data;
3046         struct dasd_ccw_req *cqr;
3047         struct ccw1 *ccw;
3048         struct req_iterator iter;
3049         struct bio_vec bv;
3050         char *dst;
3051         unsigned int off;
3052         int count, cidaw, cplength, datasize;
3053         sector_t recid;
3054         unsigned char cmd, rcmd;
3055         int use_prefix;
3056         struct dasd_device *basedev;
3057
3058         basedev = block->base;
3059         private = basedev->private;
3060         if (rq_data_dir(req) == READ)
3061                 cmd = DASD_ECKD_CCW_READ_MT;
3062         else if (rq_data_dir(req) == WRITE)
3063                 cmd = DASD_ECKD_CCW_WRITE_MT;
3064         else
3065                 return ERR_PTR(-EINVAL);
3066
3067         /* Check struct bio and count the number of blocks for the request. */
3068         count = 0;
3069         cidaw = 0;
3070         rq_for_each_segment(bv, req, iter) {
3071                 if (bv.bv_len & (blksize - 1))
3072                         /* Eckd can only do full blocks. */
3073                         return ERR_PTR(-EINVAL);
3074                 count += bv.bv_len >> (block->s2b_shift + 9);
3075                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3076                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3077         }
3078         /* Paranoia. */
3079         if (count != last_rec - first_rec + 1)
3080                 return ERR_PTR(-EINVAL);
3081
3082         /* use the prefix command if available */
3083         use_prefix = private->features.feature[8] & 0x01;
3084         if (use_prefix) {
3085                 /* 1x prefix + number of blocks */
3086                 cplength = 2 + count;
3087                 /* 1x prefix + cidaws*sizeof(long) */
3088                 datasize = sizeof(struct PFX_eckd_data) +
3089                         sizeof(struct LO_eckd_data) +
3090                         cidaw * sizeof(unsigned long);
3091         } else {
3092                 /* 1x define extent + 1x locate record + number of blocks */
3093                 cplength = 2 + count;
3094                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3095                 datasize = sizeof(struct DE_eckd_data) +
3096                         sizeof(struct LO_eckd_data) +
3097                         cidaw * sizeof(unsigned long);
3098         }
3099         /* Find out the number of additional locate record ccws for cdl. */
3100         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3101                 if (last_rec >= 2*blk_per_trk)
3102                         count = 2*blk_per_trk - first_rec;
3103                 cplength += count;
3104                 datasize += count*sizeof(struct LO_eckd_data);
3105         }
3106         /* Allocate the ccw request. */
3107         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3108                                    startdev, blk_mq_rq_to_pdu(req));
3109         if (IS_ERR(cqr))
3110                 return cqr;
3111         ccw = cqr->cpaddr;
3112         /* First ccw is define extent or prefix. */
3113         if (use_prefix) {
3114                 if (prefix(ccw++, cqr->data, first_trk,
3115                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3116                         /* Clock not in sync and XRC is enabled.
3117                          * Try again later.
3118                          */
3119                         dasd_sfree_request(cqr, startdev);
3120                         return ERR_PTR(-EAGAIN);
3121                 }
3122                 idaws = (unsigned long *) (cqr->data +
3123                                            sizeof(struct PFX_eckd_data));
3124         } else {
3125                 if (define_extent(ccw++, cqr->data, first_trk,
3126                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3127                         /* Clock not in sync and XRC is enabled.
3128                          * Try again later.
3129                          */
3130                         dasd_sfree_request(cqr, startdev);
3131                         return ERR_PTR(-EAGAIN);
3132                 }
3133                 idaws = (unsigned long *) (cqr->data +
3134                                            sizeof(struct DE_eckd_data));
3135         }
3136         /* Build locate_record+read/write/ccws. */
3137         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3138         recid = first_rec;
3139         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3140                 /* Only standard blocks so there is just one locate record. */
3141                 ccw[-1].flags |= CCW_FLAG_CC;
3142                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3143                               last_rec - recid + 1, cmd, basedev, blksize);
3144         }
3145         rq_for_each_segment(bv, req, iter) {
3146                 dst = page_address(bv.bv_page) + bv.bv_offset;
3147                 if (dasd_page_cache) {
3148                         char *copy = kmem_cache_alloc(dasd_page_cache,
3149                                                       GFP_DMA | __GFP_NOWARN);
3150                         if (copy && rq_data_dir(req) == WRITE)
3151                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3152                         if (copy)
3153                                 dst = copy + bv.bv_offset;
3154                 }
3155                 for (off = 0; off < bv.bv_len; off += blksize) {
3156                         sector_t trkid = recid;
3157                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3158                         rcmd = cmd;
3159                         count = blksize;
3160                         /* Locate record for cdl special block ? */
3161                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3162                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3163                                         rcmd |= 0x8;
3164                                         count = dasd_eckd_cdl_reclen(recid);
3165                                         if (count < blksize &&
3166                                             rq_data_dir(req) == READ)
3167                                                 memset(dst + count, 0xe5,
3168                                                        blksize - count);
3169                                 }
3170                                 ccw[-1].flags |= CCW_FLAG_CC;
3171                                 locate_record(ccw++, LO_data++,
3172                                               trkid, recoffs + 1,
3173                                               1, rcmd, basedev, count);
3174                         }
3175                         /* Locate record for standard blocks ? */
3176                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3177                                 ccw[-1].flags |= CCW_FLAG_CC;
3178                                 locate_record(ccw++, LO_data++,
3179                                               trkid, recoffs + 1,
3180                                               last_rec - recid + 1,
3181                                               cmd, basedev, count);
3182                         }
3183                         /* Read/write ccw. */
3184                         ccw[-1].flags |= CCW_FLAG_CC;
3185                         ccw->cmd_code = rcmd;
3186                         ccw->count = count;
3187                         if (idal_is_needed(dst, blksize)) {
3188                                 ccw->cda = (__u32)(addr_t) idaws;
3189                                 ccw->flags = CCW_FLAG_IDA;
3190                                 idaws = idal_create_words(idaws, dst, blksize);
3191                         } else {
3192                                 ccw->cda = (__u32)(addr_t) dst;
3193                                 ccw->flags = 0;
3194                         }
3195                         ccw++;
3196                         dst += blksize;
3197                         recid++;
3198                 }
3199         }
3200         if (blk_noretry_request(req) ||
3201             block->base->features & DASD_FEATURE_FAILFAST)
3202                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3203         cqr->startdev = startdev;
3204         cqr->memdev = startdev;
3205         cqr->block = block;
3206         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3207         cqr->lpm = dasd_path_get_ppm(startdev);
3208         cqr->retries = startdev->default_retries;
3209         cqr->buildclk = get_tod_clock();
3210         cqr->status = DASD_CQR_FILLED;
3211         return cqr;
3212 }
3213
3214 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3215                                                struct dasd_device *startdev,
3216                                                struct dasd_block *block,
3217                                                struct request *req,
3218                                                sector_t first_rec,
3219                                                sector_t last_rec,
3220                                                sector_t first_trk,
3221                                                sector_t last_trk,
3222                                                unsigned int first_offs,
3223                                                unsigned int last_offs,
3224                                                unsigned int blk_per_trk,
3225                                                unsigned int blksize)
3226 {
3227         unsigned long *idaws;
3228         struct dasd_ccw_req *cqr;
3229         struct ccw1 *ccw;
3230         struct req_iterator iter;
3231         struct bio_vec bv;
3232         char *dst, *idaw_dst;
3233         unsigned int cidaw, cplength, datasize;
3234         unsigned int tlf;
3235         sector_t recid;
3236         unsigned char cmd;
3237         struct dasd_device *basedev;
3238         unsigned int trkcount, count, count_to_trk_end;
3239         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3240         unsigned char new_track, end_idaw;
3241         sector_t trkid;
3242         unsigned int recoffs;
3243
3244         basedev = block->base;
3245         if (rq_data_dir(req) == READ)
3246                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3247         else if (rq_data_dir(req) == WRITE)
3248                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3249         else
3250                 return ERR_PTR(-EINVAL);
3251
3252         /* Track based I/O needs IDAWs for each page, and not just for
3253          * 64 bit addresses. We need additional idals for pages
3254          * that get filled from two tracks, so we use the number
3255          * of records as upper limit.
3256          */
3257         cidaw = last_rec - first_rec + 1;
3258         trkcount = last_trk - first_trk + 1;
3259
3260         /* 1x prefix + one read/write ccw per track */
3261         cplength = 1 + trkcount;
3262
3263         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3264
3265         /* Allocate the ccw request. */
3266         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3267                                    startdev, blk_mq_rq_to_pdu(req));
3268         if (IS_ERR(cqr))
3269                 return cqr;
3270         ccw = cqr->cpaddr;
3271         /* transfer length factor: how many bytes to read from the last track */
3272         if (first_trk == last_trk)
3273                 tlf = last_offs - first_offs + 1;
3274         else
3275                 tlf = last_offs + 1;
3276         tlf *= blksize;
3277
3278         if (prefix_LRE(ccw++, cqr->data, first_trk,
3279                        last_trk, cmd, basedev, startdev,
3280                        1 /* format */, first_offs + 1,
3281                        trkcount, blksize,
3282                        tlf) == -EAGAIN) {
3283                 /* Clock not in sync and XRC is enabled.
3284                  * Try again later.
3285                  */
3286                 dasd_sfree_request(cqr, startdev);
3287                 return ERR_PTR(-EAGAIN);
3288         }
3289
3290         /*
3291          * The translation of request into ccw programs must meet the
3292          * following conditions:
3293          * - all idaws but the first and the last must address full pages
3294          *   (or 2K blocks on 31-bit)
3295          * - the scope of a ccw and it's idal ends with the track boundaries
3296          */
3297         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3298         recid = first_rec;
3299         new_track = 1;
3300         end_idaw = 0;
3301         len_to_track_end = 0;
3302         idaw_dst = NULL;
3303         idaw_len = 0;
3304         rq_for_each_segment(bv, req, iter) {
3305                 dst = page_address(bv.bv_page) + bv.bv_offset;
3306                 seg_len = bv.bv_len;
3307                 while (seg_len) {
3308                         if (new_track) {
3309                                 trkid = recid;
3310                                 recoffs = sector_div(trkid, blk_per_trk);
3311                                 count_to_trk_end = blk_per_trk - recoffs;
3312                                 count = min((last_rec - recid + 1),
3313                                             (sector_t)count_to_trk_end);
3314                                 len_to_track_end = count * blksize;
3315                                 ccw[-1].flags |= CCW_FLAG_CC;
3316                                 ccw->cmd_code = cmd;
3317                                 ccw->count = len_to_track_end;
3318                                 ccw->cda = (__u32)(addr_t)idaws;
3319                                 ccw->flags = CCW_FLAG_IDA;
3320                                 ccw++;
3321                                 recid += count;
3322                                 new_track = 0;
3323                                 /* first idaw for a ccw may start anywhere */
3324                                 if (!idaw_dst)
3325                                         idaw_dst = dst;
3326                         }
3327                         /* If we start a new idaw, we must make sure that it
3328                          * starts on an IDA_BLOCK_SIZE boundary.
3329                          * If we continue an idaw, we must make sure that the
3330                          * current segment begins where the so far accumulated
3331                          * idaw ends
3332                          */
3333                         if (!idaw_dst) {
3334                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3335                                         dasd_sfree_request(cqr, startdev);
3336                                         return ERR_PTR(-ERANGE);
3337                                 } else
3338                                         idaw_dst = dst;
3339                         }
3340                         if ((idaw_dst + idaw_len) != dst) {
3341                                 dasd_sfree_request(cqr, startdev);
3342                                 return ERR_PTR(-ERANGE);
3343                         }
3344                         part_len = min(seg_len, len_to_track_end);
3345                         seg_len -= part_len;
3346                         dst += part_len;
3347                         idaw_len += part_len;
3348                         len_to_track_end -= part_len;
3349                         /* collected memory area ends on an IDA_BLOCK border,
3350                          * -> create an idaw
3351                          * idal_create_words will handle cases where idaw_len
3352                          * is larger then IDA_BLOCK_SIZE
3353                          */
3354                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3355                                 end_idaw = 1;
3356                         /* We also need to end the idaw at track end */
3357                         if (!len_to_track_end) {
3358                                 new_track = 1;
3359                                 end_idaw = 1;
3360                         }
3361                         if (end_idaw) {
3362                                 idaws = idal_create_words(idaws, idaw_dst,
3363                                                           idaw_len);
3364                                 idaw_dst = NULL;
3365                                 idaw_len = 0;
3366                                 end_idaw = 0;
3367                         }
3368                 }
3369         }
3370
3371         if (blk_noretry_request(req) ||
3372             block->base->features & DASD_FEATURE_FAILFAST)
3373                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3374         cqr->startdev = startdev;
3375         cqr->memdev = startdev;
3376         cqr->block = block;
3377         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3378         cqr->lpm = dasd_path_get_ppm(startdev);
3379         cqr->retries = startdev->default_retries;
3380         cqr->buildclk = get_tod_clock();
3381         cqr->status = DASD_CQR_FILLED;
3382         return cqr;
3383 }
3384
3385 static int prepare_itcw(struct itcw *itcw,
3386                         unsigned int trk, unsigned int totrk, int cmd,
3387                         struct dasd_device *basedev,
3388                         struct dasd_device *startdev,
3389                         unsigned int rec_on_trk, int count,
3390                         unsigned int blksize,
3391                         unsigned int total_data_size,
3392                         unsigned int tlf,
3393                         unsigned int blk_per_trk)
3394 {
3395         struct PFX_eckd_data pfxdata;
3396         struct dasd_eckd_private *basepriv, *startpriv;
3397         struct DE_eckd_data *dedata;
3398         struct LRE_eckd_data *lredata;
3399         struct dcw *dcw;
3400
3401         u32 begcyl, endcyl;
3402         u16 heads, beghead, endhead;
3403         u8 pfx_cmd;
3404
3405         int rc = 0;
3406         int sector = 0;
3407         int dn, d;
3408
3409
3410         /* setup prefix data */
3411         basepriv = basedev->private;
3412         startpriv = startdev->private;
3413         dedata = &pfxdata.define_extent;
3414         lredata = &pfxdata.locate_record;
3415
3416         memset(&pfxdata, 0, sizeof(pfxdata));
3417         pfxdata.format = 1; /* PFX with LRE */
3418         pfxdata.base_address = basepriv->ned->unit_addr;
3419         pfxdata.base_lss = basepriv->ned->ID;
3420         pfxdata.validity.define_extent = 1;
3421
3422         /* private uid is kept up to date, conf_data may be outdated */
3423         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3424                 pfxdata.validity.verify_base = 1;
3425
3426         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3427                 pfxdata.validity.verify_base = 1;
3428                 pfxdata.validity.hyper_pav = 1;
3429         }
3430
3431         switch (cmd) {
3432         case DASD_ECKD_CCW_READ_TRACK_DATA:
3433                 dedata->mask.perm = 0x1;
3434                 dedata->attributes.operation = basepriv->attrib.operation;
3435                 dedata->blk_size = blksize;
3436                 dedata->ga_extended |= 0x42;
3437                 lredata->operation.orientation = 0x0;
3438                 lredata->operation.operation = 0x0C;
3439                 lredata->auxiliary.check_bytes = 0x01;
3440                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3441                 break;
3442         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3443                 dedata->mask.perm = 0x02;
3444                 dedata->attributes.operation = basepriv->attrib.operation;
3445                 dedata->blk_size = blksize;
3446                 rc = set_timestamp(NULL, dedata, basedev);
3447                 dedata->ga_extended |= 0x42;
3448                 lredata->operation.orientation = 0x0;
3449                 lredata->operation.operation = 0x3F;
3450                 lredata->extended_operation = 0x23;
3451                 lredata->auxiliary.check_bytes = 0x2;
3452                 /*
3453                  * If XRC is supported the System Time Stamp is set. The
3454                  * validity of the time stamp must be reflected in the prefix
3455                  * data as well.
3456                  */
3457                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3458                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3459                 pfx_cmd = DASD_ECKD_CCW_PFX;
3460                 break;
3461         case DASD_ECKD_CCW_READ_COUNT_MT:
3462                 dedata->mask.perm = 0x1;
3463                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3464                 dedata->ga_extended |= 0x42;
3465                 dedata->blk_size = blksize;
3466                 lredata->operation.orientation = 0x2;
3467                 lredata->operation.operation = 0x16;
3468                 lredata->auxiliary.check_bytes = 0x01;
3469                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3470                 break;
3471         default:
3472                 DBF_DEV_EVENT(DBF_ERR, basedev,
3473                               "prepare itcw, unknown opcode 0x%x", cmd);
3474                 BUG();
3475                 break;
3476         }
3477         if (rc)
3478                 return rc;
3479
3480         dedata->attributes.mode = 0x3;  /* ECKD */
3481
3482         heads = basepriv->rdc_data.trk_per_cyl;
3483         begcyl = trk / heads;
3484         beghead = trk % heads;
3485         endcyl = totrk / heads;
3486         endhead = totrk % heads;
3487
3488         /* check for sequential prestage - enhance cylinder range */
3489         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3490             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3491
3492                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3493                         endcyl += basepriv->attrib.nr_cyl;
3494                 else
3495                         endcyl = (basepriv->real_cyl - 1);
3496         }
3497
3498         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3499         set_ch_t(&dedata->end_ext, endcyl, endhead);
3500
3501         dedata->ep_format = 0x20; /* records per track is valid */
3502         dedata->ep_rec_per_track = blk_per_trk;
3503
3504         if (rec_on_trk) {
3505                 switch (basepriv->rdc_data.dev_type) {
3506                 case 0x3390:
3507                         dn = ceil_quot(blksize + 6, 232);
3508                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3509                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3510                         break;
3511                 case 0x3380:
3512                         d = 7 + ceil_quot(blksize + 12, 32);
3513                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3514                         break;
3515                 }
3516         }
3517
3518         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3519                 lredata->auxiliary.length_valid = 0;
3520                 lredata->auxiliary.length_scope = 0;
3521                 lredata->sector = 0xff;
3522         } else {
3523                 lredata->auxiliary.length_valid = 1;
3524                 lredata->auxiliary.length_scope = 1;
3525                 lredata->sector = sector;
3526         }
3527         lredata->auxiliary.imbedded_ccw_valid = 1;
3528         lredata->length = tlf;
3529         lredata->imbedded_ccw = cmd;
3530         lredata->count = count;
3531         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3532         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3533         lredata->search_arg.head = lredata->seek_addr.head;
3534         lredata->search_arg.record = rec_on_trk;
3535
3536         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3537                      &pfxdata, sizeof(pfxdata), total_data_size);
3538         return PTR_RET(dcw);
3539 }
3540
3541 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3542                                                struct dasd_device *startdev,
3543                                                struct dasd_block *block,
3544                                                struct request *req,
3545                                                sector_t first_rec,
3546                                                sector_t last_rec,
3547                                                sector_t first_trk,
3548                                                sector_t last_trk,
3549                                                unsigned int first_offs,
3550                                                unsigned int last_offs,
3551                                                unsigned int blk_per_trk,
3552                                                unsigned int blksize)
3553 {
3554         struct dasd_ccw_req *cqr;
3555         struct req_iterator iter;
3556         struct bio_vec bv;
3557         char *dst;
3558         unsigned int trkcount, ctidaw;
3559         unsigned char cmd;
3560         struct dasd_device *basedev;
3561         unsigned int tlf;
3562         struct itcw *itcw;
3563         struct tidaw *last_tidaw = NULL;
3564         int itcw_op;
3565         size_t itcw_size;
3566         u8 tidaw_flags;
3567         unsigned int seg_len, part_len, len_to_track_end;
3568         unsigned char new_track;
3569         sector_t recid, trkid;
3570         unsigned int offs;
3571         unsigned int count, count_to_trk_end;
3572         int ret;
3573
3574         basedev = block->base;
3575         if (rq_data_dir(req) == READ) {
3576                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3577                 itcw_op = ITCW_OP_READ;
3578         } else if (rq_data_dir(req) == WRITE) {
3579                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3580                 itcw_op = ITCW_OP_WRITE;
3581         } else
3582                 return ERR_PTR(-EINVAL);
3583
3584         /* trackbased I/O needs address all memory via TIDAWs,
3585          * not just for 64 bit addresses. This allows us to map
3586          * each segment directly to one tidaw.
3587          * In the case of write requests, additional tidaws may
3588          * be needed when a segment crosses a track boundary.
3589          */
3590         trkcount = last_trk - first_trk + 1;
3591         ctidaw = 0;
3592         rq_for_each_segment(bv, req, iter) {
3593                 ++ctidaw;
3594         }
3595         if (rq_data_dir(req) == WRITE)
3596                 ctidaw += (last_trk - first_trk);
3597
3598         /* Allocate the ccw request. */
3599         itcw_size = itcw_calc_size(0, ctidaw, 0);
3600         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev,
3601                                    blk_mq_rq_to_pdu(req));
3602         if (IS_ERR(cqr))
3603                 return cqr;
3604
3605         /* transfer length factor: how many bytes to read from the last track */
3606         if (first_trk == last_trk)
3607                 tlf = last_offs - first_offs + 1;
3608         else
3609                 tlf = last_offs + 1;
3610         tlf *= blksize;
3611
3612         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3613         if (IS_ERR(itcw)) {
3614                 ret = -EINVAL;
3615                 goto out_error;
3616         }
3617         cqr->cpaddr = itcw_get_tcw(itcw);
3618         if (prepare_itcw(itcw, first_trk, last_trk,
3619                          cmd, basedev, startdev,
3620                          first_offs + 1,
3621                          trkcount, blksize,
3622                          (last_rec - first_rec + 1) * blksize,
3623                          tlf, blk_per_trk) == -EAGAIN) {
3624                 /* Clock not in sync and XRC is enabled.
3625                  * Try again later.
3626                  */
3627                 ret = -EAGAIN;
3628                 goto out_error;
3629         }
3630         len_to_track_end = 0;
3631         /*
3632          * A tidaw can address 4k of memory, but must not cross page boundaries
3633          * We can let the block layer handle this by setting
3634          * blk_queue_segment_boundary to page boundaries and
3635          * blk_max_segment_size to page size when setting up the request queue.
3636          * For write requests, a TIDAW must not cross track boundaries, because
3637          * we have to set the CBC flag on the last tidaw for each track.
3638          */
3639         if (rq_data_dir(req) == WRITE) {
3640                 new_track = 1;
3641                 recid = first_rec;
3642                 rq_for_each_segment(bv, req, iter) {
3643                         dst = page_address(bv.bv_page) + bv.bv_offset;
3644                         seg_len = bv.bv_len;
3645                         while (seg_len) {
3646                                 if (new_track) {
3647                                         trkid = recid;
3648                                         offs = sector_div(trkid, blk_per_trk);
3649                                         count_to_trk_end = blk_per_trk - offs;
3650                                         count = min((last_rec - recid + 1),
3651                                                     (sector_t)count_to_trk_end);
3652                                         len_to_track_end = count * blksize;
3653                                         recid += count;
3654                                         new_track = 0;
3655                                 }
3656                                 part_len = min(seg_len, len_to_track_end);
3657                                 seg_len -= part_len;
3658                                 len_to_track_end -= part_len;
3659                                 /* We need to end the tidaw at track end */
3660                                 if (!len_to_track_end) {
3661                                         new_track = 1;
3662                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3663                                 } else
3664                                         tidaw_flags = 0;
3665                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3666                                                             dst, part_len);
3667                                 if (IS_ERR(last_tidaw)) {
3668                                         ret = -EINVAL;
3669                                         goto out_error;
3670                                 }
3671                                 dst += part_len;
3672                         }
3673                 }
3674         } else {
3675                 rq_for_each_segment(bv, req, iter) {
3676                         dst = page_address(bv.bv_page) + bv.bv_offset;
3677                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3678                                                     dst, bv.bv_len);
3679                         if (IS_ERR(last_tidaw)) {
3680                                 ret = -EINVAL;
3681                                 goto out_error;
3682                         }
3683                 }
3684         }
3685         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3686         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3687         itcw_finalize(itcw);
3688
3689         if (blk_noretry_request(req) ||
3690             block->base->features & DASD_FEATURE_FAILFAST)
3691                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3692         cqr->cpmode = 1;
3693         cqr->startdev = startdev;
3694         cqr->memdev = startdev;
3695         cqr->block = block;
3696         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3697         cqr->lpm = dasd_path_get_ppm(startdev);
3698         cqr->retries = startdev->default_retries;
3699         cqr->buildclk = get_tod_clock();
3700         cqr->status = DASD_CQR_FILLED;
3701         return cqr;
3702 out_error:
3703         dasd_sfree_request(cqr, startdev);
3704         return ERR_PTR(ret);
3705 }
3706
3707 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3708                                                struct dasd_block *block,
3709                                                struct request *req)
3710 {
3711         int cmdrtd, cmdwtd;
3712         int use_prefix;
3713         int fcx_multitrack;
3714         struct dasd_eckd_private *private;
3715         struct dasd_device *basedev;
3716         sector_t first_rec, last_rec;
3717         sector_t first_trk, last_trk;
3718         unsigned int first_offs, last_offs;
3719         unsigned int blk_per_trk, blksize;
3720         int cdlspecial;
3721         unsigned int data_size;
3722         struct dasd_ccw_req *cqr;
3723
3724         basedev = block->base;
3725         private = basedev->private;
3726
3727         /* Calculate number of blocks/records per track. */
3728         blksize = block->bp_block;
3729         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3730         if (blk_per_trk == 0)
3731                 return ERR_PTR(-EINVAL);
3732         /* Calculate record id of first and last block. */
3733         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3734         first_offs = sector_div(first_trk, blk_per_trk);
3735         last_rec = last_trk =
3736                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3737         last_offs = sector_div(last_trk, blk_per_trk);
3738         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3739
3740         fcx_multitrack = private->features.feature[40] & 0x20;
3741         data_size = blk_rq_bytes(req);
3742         if (data_size % blksize)
3743                 return ERR_PTR(-EINVAL);
3744         /* tpm write request add CBC data on each track boundary */
3745         if (rq_data_dir(req) == WRITE)
3746                 data_size += (last_trk - first_trk) * 4;
3747
3748         /* is read track data and write track data in command mode supported? */
3749         cmdrtd = private->features.feature[9] & 0x20;
3750         cmdwtd = private->features.feature[12] & 0x40;
3751         use_prefix = private->features.feature[8] & 0x01;
3752
3753         cqr = NULL;
3754         if (cdlspecial || dasd_page_cache) {
3755                 /* do nothing, just fall through to the cmd mode single case */
3756         } else if ((data_size <= private->fcx_max_data)
3757                    && (fcx_multitrack || (first_trk == last_trk))) {
3758                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3759                                                     first_rec, last_rec,
3760                                                     first_trk, last_trk,
3761                                                     first_offs, last_offs,
3762                                                     blk_per_trk, blksize);
3763                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3764                     (PTR_ERR(cqr) != -ENOMEM))
3765                         cqr = NULL;
3766         } else if (use_prefix &&
3767                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3768                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3769                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3770                                                    first_rec, last_rec,
3771                                                    first_trk, last_trk,
3772                                                    first_offs, last_offs,
3773                                                    blk_per_trk, blksize);
3774                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3775                     (PTR_ERR(cqr) != -ENOMEM))
3776                         cqr = NULL;
3777         }
3778         if (!cqr)
3779                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3780                                                     first_rec, last_rec,
3781                                                     first_trk, last_trk,
3782                                                     first_offs, last_offs,
3783                                                     blk_per_trk, blksize);
3784         return cqr;
3785 }
3786
3787 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3788                                                    struct dasd_block *block,
3789                                                    struct request *req)
3790 {
3791         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3792         unsigned int seg_len, len_to_track_end;
3793         unsigned int cidaw, cplength, datasize;
3794         sector_t first_trk, last_trk, sectors;
3795         struct dasd_eckd_private *base_priv;
3796         struct dasd_device *basedev;
3797         struct req_iterator iter;
3798         struct dasd_ccw_req *cqr;
3799         unsigned int first_offs;
3800         unsigned int trkcount;
3801         unsigned long *idaws;
3802         unsigned int size;
3803         unsigned char cmd;
3804         struct bio_vec bv;
3805         struct ccw1 *ccw;
3806         int use_prefix;
3807         void *data;
3808         char *dst;
3809
3810         /*
3811          * raw track access needs to be mutiple of 64k and on 64k boundary
3812          * For read requests we can fix an incorrect alignment by padding
3813          * the request with dummy pages.
3814          */
3815         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3816         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3817                 DASD_RAW_SECTORS_PER_TRACK;
3818         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3819                 DASD_RAW_SECTORS_PER_TRACK;
3820         basedev = block->base;
3821         if ((start_padding_sectors || end_padding_sectors) &&
3822             (rq_data_dir(req) == WRITE)) {
3823                 DBF_DEV_EVENT(DBF_ERR, basedev,
3824                               "raw write not track aligned (%lu,%lu) req %p",
3825                               start_padding_sectors, end_padding_sectors, req);
3826                 return ERR_PTR(-EINVAL);
3827         }
3828
3829         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3830         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3831                 DASD_RAW_SECTORS_PER_TRACK;
3832         trkcount = last_trk - first_trk + 1;
3833         first_offs = 0;
3834
3835         if (rq_data_dir(req) == READ)
3836                 cmd = DASD_ECKD_CCW_READ_TRACK;
3837         else if (rq_data_dir(req) == WRITE)
3838                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3839         else
3840                 return ERR_PTR(-EINVAL);
3841
3842         /*
3843          * Raw track based I/O needs IDAWs for each page,
3844          * and not just for 64 bit addresses.
3845          */
3846         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3847
3848         /*
3849          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3850          * of extended parameter. This is needed for write full track.
3851          */
3852         base_priv = basedev->private;
3853         use_prefix = base_priv->features.feature[8] & 0x01;
3854         if (use_prefix) {
3855                 cplength = 1 + trkcount;
3856                 size = sizeof(struct PFX_eckd_data) + 2;
3857         } else {
3858                 cplength = 2 + trkcount;
3859                 size = sizeof(struct DE_eckd_data) +
3860                         sizeof(struct LRE_eckd_data) + 2;
3861         }
3862         size = ALIGN(size, 8);
3863
3864         datasize = size + cidaw * sizeof(unsigned long);
3865
3866         /* Allocate the ccw request. */
3867         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3868                                    datasize, startdev, blk_mq_rq_to_pdu(req));
3869         if (IS_ERR(cqr))
3870                 return cqr;
3871
3872         ccw = cqr->cpaddr;
3873         data = cqr->data;
3874
3875         if (use_prefix) {
3876                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3877                            startdev, 1, first_offs + 1, trkcount, 0, 0);
3878         } else {
3879                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3880                 ccw[-1].flags |= CCW_FLAG_CC;
3881
3882                 data += sizeof(struct DE_eckd_data);
3883                 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
3884                                   trkcount, cmd, basedev, 0, 0);
3885         }
3886
3887         idaws = (unsigned long *)(cqr->data + size);
3888         len_to_track_end = 0;
3889         if (start_padding_sectors) {
3890                 ccw[-1].flags |= CCW_FLAG_CC;
3891                 ccw->cmd_code = cmd;
3892                 /* maximum 3390 track size */
3893                 ccw->count = 57326;
3894                 /* 64k map to one track */
3895                 len_to_track_end = 65536 - start_padding_sectors * 512;
3896                 ccw->cda = (__u32)(addr_t)idaws;
3897                 ccw->flags |= CCW_FLAG_IDA;
3898                 ccw->flags |= CCW_FLAG_SLI;
3899                 ccw++;
3900                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3901                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3902         }
3903         rq_for_each_segment(bv, req, iter) {
3904                 dst = page_address(bv.bv_page) + bv.bv_offset;
3905                 seg_len = bv.bv_len;
3906                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3907                         memset(dst, 0, seg_len);
3908                 if (!len_to_track_end) {
3909                         ccw[-1].flags |= CCW_FLAG_CC;
3910                         ccw->cmd_code = cmd;
3911                         /* maximum 3390 track size */
3912                         ccw->count = 57326;
3913                         /* 64k map to one track */
3914                         len_to_track_end = 65536;
3915                         ccw->cda = (__u32)(addr_t)idaws;
3916                         ccw->flags |= CCW_FLAG_IDA;
3917                         ccw->flags |= CCW_FLAG_SLI;
3918                         ccw++;
3919                 }
3920                 len_to_track_end -= seg_len;
3921                 idaws = idal_create_words(idaws, dst, seg_len);
3922         }
3923         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3924                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3925         if (blk_noretry_request(req) ||
3926             block->base->features & DASD_FEATURE_FAILFAST)
3927                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3928         cqr->startdev = startdev;
3929         cqr->memdev = startdev;
3930         cqr->block = block;
3931         cqr->expires = startdev->default_expires * HZ;
3932         cqr->lpm = dasd_path_get_ppm(startdev);
3933         cqr->retries = startdev->default_retries;
3934         cqr->buildclk = get_tod_clock();
3935         cqr->status = DASD_CQR_FILLED;
3936
3937         return cqr;
3938 }
3939
3940
3941 static int
3942 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3943 {
3944         struct dasd_eckd_private *private;
3945         struct ccw1 *ccw;
3946         struct req_iterator iter;
3947         struct bio_vec bv;
3948         char *dst, *cda;
3949         unsigned int blksize, blk_per_trk, off;
3950         sector_t recid;
3951         int status;
3952
3953         if (!dasd_page_cache)
3954                 goto out;
3955         private = cqr->block->base->private;
3956         blksize = cqr->block->bp_block;
3957         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3958         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3959         ccw = cqr->cpaddr;
3960         /* Skip over define extent & locate record. */
3961         ccw++;
3962         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3963                 ccw++;
3964         rq_for_each_segment(bv, req, iter) {
3965                 dst = page_address(bv.bv_page) + bv.bv_offset;
3966                 for (off = 0; off < bv.bv_len; off += blksize) {
3967                         /* Skip locate record. */
3968                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3969                                 ccw++;
3970                         if (dst) {
3971                                 if (ccw->flags & CCW_FLAG_IDA)
3972                                         cda = *((char **)((addr_t) ccw->cda));
3973                                 else
3974                                         cda = (char *)((addr_t) ccw->cda);
3975                                 if (dst != cda) {
3976                                         if (rq_data_dir(req) == READ)
3977                                                 memcpy(dst, cda, bv.bv_len);
3978                                         kmem_cache_free(dasd_page_cache,
3979                                             (void *)((addr_t)cda & PAGE_MASK));
3980                                 }
3981                                 dst = NULL;
3982                         }
3983                         ccw++;
3984                         recid++;
3985                 }
3986         }
3987 out:
3988         status = cqr->status == DASD_CQR_DONE;
3989         dasd_sfree_request(cqr, cqr->memdev);
3990         return status;
3991 }
3992
3993 /*
3994  * Modify ccw/tcw in cqr so it can be started on a base device.
3995  *
3996  * Note that this is not enough to restart the cqr!
3997  * Either reset cqr->startdev as well (summary unit check handling)
3998  * or restart via separate cqr (as in ERP handling).
3999  */
4000 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
4001 {
4002         struct ccw1 *ccw;
4003         struct PFX_eckd_data *pfxdata;
4004         struct tcw *tcw;
4005         struct tccb *tccb;
4006         struct dcw *dcw;
4007
4008         if (cqr->cpmode == 1) {
4009                 tcw = cqr->cpaddr;
4010                 tccb = tcw_get_tccb(tcw);
4011                 dcw = (struct dcw *)&tccb->tca[0];
4012                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4013                 pfxdata->validity.verify_base = 0;
4014                 pfxdata->validity.hyper_pav = 0;
4015         } else {
4016                 ccw = cqr->cpaddr;
4017                 pfxdata = cqr->data;
4018                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4019                         pfxdata->validity.verify_base = 0;
4020                         pfxdata->validity.hyper_pav = 0;
4021                 }
4022         }
4023 }
4024
4025 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4026
4027 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4028                                                      struct dasd_block *block,
4029                                                      struct request *req)
4030 {
4031         struct dasd_eckd_private *private;
4032         struct dasd_device *startdev;
4033         unsigned long flags;
4034         struct dasd_ccw_req *cqr;
4035
4036         startdev = dasd_alias_get_start_dev(base);
4037         if (!startdev)
4038                 startdev = base;
4039         private = startdev->private;
4040         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4041                 return ERR_PTR(-EBUSY);
4042
4043         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4044         private->count++;
4045         if ((base->features & DASD_FEATURE_USERAW))
4046                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4047         else
4048                 cqr = dasd_eckd_build_cp(startdev, block, req);
4049         if (IS_ERR(cqr))
4050                 private->count--;
4051         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4052         return cqr;
4053 }
4054
4055 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4056                                    struct request *req)
4057 {
4058         struct dasd_eckd_private *private;
4059         unsigned long flags;
4060
4061         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4062         private = cqr->memdev->private;
4063         private->count--;
4064         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4065         return dasd_eckd_free_cp(cqr, req);
4066 }
4067
4068 static int
4069 dasd_eckd_fill_info(struct dasd_device * device,
4070                     struct dasd_information2_t * info)
4071 {
4072         struct dasd_eckd_private *private = device->private;
4073
4074         info->label_block = 2;
4075         info->FBA_layout = private->uses_cdl ? 0 : 1;
4076         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4077         info->characteristics_size = sizeof(private->rdc_data);
4078         memcpy(info->characteristics, &private->rdc_data,
4079                sizeof(private->rdc_data));
4080         info->confdata_size = min((unsigned long)private->conf_len,
4081                                   sizeof(info->configuration_data));
4082         memcpy(info->configuration_data, private->conf_data,
4083                info->confdata_size);
4084         return 0;
4085 }
4086
4087 /*
4088  * SECTION: ioctl functions for eckd devices.
4089  */
4090
4091 /*
4092  * Release device ioctl.
4093  * Buils a channel programm to releases a prior reserved
4094  * (see dasd_eckd_reserve) device.
4095  */
4096 static int
4097 dasd_eckd_release(struct dasd_device *device)
4098 {
4099         struct dasd_ccw_req *cqr;
4100         int rc;
4101         struct ccw1 *ccw;
4102         int useglobal;
4103
4104         if (!capable(CAP_SYS_ADMIN))
4105                 return -EACCES;
4106
4107         useglobal = 0;
4108         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4109         if (IS_ERR(cqr)) {
4110                 mutex_lock(&dasd_reserve_mutex);
4111                 useglobal = 1;
4112                 cqr = &dasd_reserve_req->cqr;
4113                 memset(cqr, 0, sizeof(*cqr));
4114                 memset(&dasd_reserve_req->ccw, 0,
4115                        sizeof(dasd_reserve_req->ccw));
4116                 cqr->cpaddr = &dasd_reserve_req->ccw;
4117                 cqr->data = &dasd_reserve_req->data;
4118                 cqr->magic = DASD_ECKD_MAGIC;
4119         }
4120         ccw = cqr->cpaddr;
4121         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4122         ccw->flags |= CCW_FLAG_SLI;
4123         ccw->count = 32;
4124         ccw->cda = (__u32)(addr_t) cqr->data;
4125         cqr->startdev = device;
4126         cqr->memdev = device;
4127         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4128         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4129         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4130         cqr->expires = 2 * HZ;
4131         cqr->buildclk = get_tod_clock();
4132         cqr->status = DASD_CQR_FILLED;
4133
4134         rc = dasd_sleep_on_immediatly(cqr);
4135         if (!rc)
4136                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4137
4138         if (useglobal)
4139                 mutex_unlock(&dasd_reserve_mutex);
4140         else
4141                 dasd_sfree_request(cqr, cqr->memdev);
4142         return rc;
4143 }
4144
4145 /*
4146  * Reserve device ioctl.
4147  * Options are set to 'synchronous wait for interrupt' and
4148  * 'timeout the request'. This leads to a terminate IO if
4149  * the interrupt is outstanding for a certain time.
4150  */
4151 static int
4152 dasd_eckd_reserve(struct dasd_device *device)
4153 {
4154         struct dasd_ccw_req *cqr;
4155         int rc;
4156         struct ccw1 *ccw;
4157         int useglobal;
4158
4159         if (!capable(CAP_SYS_ADMIN))
4160                 return -EACCES;
4161
4162         useglobal = 0;
4163         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4164         if (IS_ERR(cqr)) {
4165                 mutex_lock(&dasd_reserve_mutex);
4166                 useglobal = 1;
4167                 cqr = &dasd_reserve_req->cqr;
4168                 memset(cqr, 0, sizeof(*cqr));
4169                 memset(&dasd_reserve_req->ccw, 0,
4170                        sizeof(dasd_reserve_req->ccw));
4171                 cqr->cpaddr = &dasd_reserve_req->ccw;
4172                 cqr->data = &dasd_reserve_req->data;
4173                 cqr->magic = DASD_ECKD_MAGIC;
4174         }
4175         ccw = cqr->cpaddr;
4176         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4177         ccw->flags |= CCW_FLAG_SLI;
4178         ccw->count = 32;
4179         ccw->cda = (__u32)(addr_t) cqr->data;
4180         cqr->startdev = device;
4181         cqr->memdev = device;
4182         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4183         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4184         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4185         cqr->expires = 2 * HZ;
4186         cqr->buildclk = get_tod_clock();
4187         cqr->status = DASD_CQR_FILLED;
4188
4189         rc = dasd_sleep_on_immediatly(cqr);
4190         if (!rc)
4191                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4192
4193         if (useglobal)
4194                 mutex_unlock(&dasd_reserve_mutex);
4195         else
4196                 dasd_sfree_request(cqr, cqr->memdev);
4197         return rc;
4198 }
4199
4200 /*
4201  * Steal lock ioctl - unconditional reserve device.
4202  * Buils a channel programm to break a device's reservation.
4203  * (unconditional reserve)
4204  */
4205 static int
4206 dasd_eckd_steal_lock(struct dasd_device *device)
4207 {
4208         struct dasd_ccw_req *cqr;
4209         int rc;
4210         struct ccw1 *ccw;
4211         int useglobal;
4212
4213         if (!capable(CAP_SYS_ADMIN))
4214                 return -EACCES;
4215
4216         useglobal = 0;
4217         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device, NULL);
4218         if (IS_ERR(cqr)) {
4219                 mutex_lock(&dasd_reserve_mutex);
4220                 useglobal = 1;
4221                 cqr = &dasd_reserve_req->cqr;
4222                 memset(cqr, 0, sizeof(*cqr));
4223                 memset(&dasd_reserve_req->ccw, 0,
4224                        sizeof(dasd_reserve_req->ccw));
4225                 cqr->cpaddr = &dasd_reserve_req->ccw;
4226                 cqr->data = &dasd_reserve_req->data;
4227                 cqr->magic = DASD_ECKD_MAGIC;
4228         }
4229         ccw = cqr->cpaddr;
4230         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4231         ccw->flags |= CCW_FLAG_SLI;
4232         ccw->count = 32;
4233         ccw->cda = (__u32)(addr_t) cqr->data;
4234         cqr->startdev = device;
4235         cqr->memdev = device;
4236         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4237         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4238         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4239         cqr->expires = 2 * HZ;
4240         cqr->buildclk = get_tod_clock();
4241         cqr->status = DASD_CQR_FILLED;
4242
4243         rc = dasd_sleep_on_immediatly(cqr);
4244         if (!rc)
4245                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4246
4247         if (useglobal)
4248                 mutex_unlock(&dasd_reserve_mutex);
4249         else
4250                 dasd_sfree_request(cqr, cqr->memdev);
4251         return rc;
4252 }
4253
4254 /*
4255  * SNID - Sense Path Group ID
4256  * This ioctl may be used in situations where I/O is stalled due to
4257  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4258  * preallocated dasd_reserve_req.
4259  */
4260 static int dasd_eckd_snid(struct dasd_device *device,
4261                           void __user *argp)
4262 {
4263         struct dasd_ccw_req *cqr;
4264         int rc;
4265         struct ccw1 *ccw;
4266         int useglobal;
4267         struct dasd_snid_ioctl_data usrparm;
4268
4269         if (!capable(CAP_SYS_ADMIN))
4270                 return -EACCES;
4271
4272         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4273                 return -EFAULT;
4274
4275         useglobal = 0;
4276         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4277                                    sizeof(struct dasd_snid_data), device,
4278                                    NULL);
4279         if (IS_ERR(cqr)) {
4280                 mutex_lock(&dasd_reserve_mutex);
4281                 useglobal = 1;
4282                 cqr = &dasd_reserve_req->cqr;
4283                 memset(cqr, 0, sizeof(*cqr));
4284                 memset(&dasd_reserve_req->ccw, 0,
4285                        sizeof(dasd_reserve_req->ccw));
4286                 cqr->cpaddr = &dasd_reserve_req->ccw;
4287                 cqr->data = &dasd_reserve_req->data;
4288                 cqr->magic = DASD_ECKD_MAGIC;
4289         }
4290         ccw = cqr->cpaddr;
4291         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4292         ccw->flags |= CCW_FLAG_SLI;
4293         ccw->count = 12;
4294         ccw->cda = (__u32)(addr_t) cqr->data;
4295         cqr->startdev = device;
4296         cqr->memdev = device;
4297         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4298         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4299         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4300         cqr->retries = 5;
4301         cqr->expires = 10 * HZ;
4302         cqr->buildclk = get_tod_clock();
4303         cqr->status = DASD_CQR_FILLED;
4304         cqr->lpm = usrparm.path_mask;
4305
4306         rc = dasd_sleep_on_immediatly(cqr);
4307         /* verify that I/O processing didn't modify the path mask */
4308         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4309                 rc = -EIO;
4310         if (!rc) {
4311                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4312                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4313                         rc = -EFAULT;
4314         }
4315
4316         if (useglobal)
4317                 mutex_unlock(&dasd_reserve_mutex);
4318         else
4319                 dasd_sfree_request(cqr, cqr->memdev);
4320         return rc;
4321 }
4322
4323 /*
4324  * Read performance statistics
4325  */
4326 static int
4327 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4328 {
4329         struct dasd_psf_prssd_data *prssdp;
4330         struct dasd_rssd_perf_stats_t *stats;
4331         struct dasd_ccw_req *cqr;
4332         struct ccw1 *ccw;
4333         int rc;
4334
4335         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4336                                    (sizeof(struct dasd_psf_prssd_data) +
4337                                     sizeof(struct dasd_rssd_perf_stats_t)),
4338                                    device, NULL);
4339         if (IS_ERR(cqr)) {
4340                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4341                             "Could not allocate initialization request");
4342                 return PTR_ERR(cqr);
4343         }
4344         cqr->startdev = device;
4345         cqr->memdev = device;
4346         cqr->retries = 0;
4347         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4348         cqr->expires = 10 * HZ;
4349
4350         /* Prepare for Read Subsystem Data */
4351         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4352         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4353         prssdp->order = PSF_ORDER_PRSSD;
4354         prssdp->suborder = 0x01;        /* Performance Statistics */
4355         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4356
4357         ccw = cqr->cpaddr;
4358         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4359         ccw->count = sizeof(struct dasd_psf_prssd_data);
4360         ccw->flags |= CCW_FLAG_CC;
4361         ccw->cda = (__u32)(addr_t) prssdp;
4362
4363         /* Read Subsystem Data - Performance Statistics */
4364         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4365         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4366
4367         ccw++;
4368         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4369         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4370         ccw->cda = (__u32)(addr_t) stats;
4371
4372         cqr->buildclk = get_tod_clock();
4373         cqr->status = DASD_CQR_FILLED;
4374         rc = dasd_sleep_on(cqr);
4375         if (rc == 0) {
4376                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4377                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4378                 if (copy_to_user(argp, stats,
4379                                  sizeof(struct dasd_rssd_perf_stats_t)))
4380                         rc = -EFAULT;
4381         }
4382         dasd_sfree_request(cqr, cqr->memdev);
4383         return rc;
4384 }
4385
4386 /*
4387  * Get attributes (cache operations)
4388  * Returnes the cache attributes used in Define Extend (DE).
4389  */
4390 static int
4391 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4392 {
4393         struct dasd_eckd_private *private = device->private;
4394         struct attrib_data_t attrib = private->attrib;
4395         int rc;
4396
4397         if (!capable(CAP_SYS_ADMIN))
4398                 return -EACCES;
4399         if (!argp)
4400                 return -EINVAL;
4401
4402         rc = 0;
4403         if (copy_to_user(argp, (long *) &attrib,
4404                          sizeof(struct attrib_data_t)))
4405                 rc = -EFAULT;
4406
4407         return rc;
4408 }
4409
4410 /*
4411  * Set attributes (cache operations)
4412  * Stores the attributes for cache operation to be used in Define Extend (DE).
4413  */
4414 static int
4415 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4416 {
4417         struct dasd_eckd_private *private = device->private;
4418         struct attrib_data_t attrib;
4419
4420         if (!capable(CAP_SYS_ADMIN))
4421                 return -EACCES;
4422         if (!argp)
4423                 return -EINVAL;
4424
4425         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4426                 return -EFAULT;
4427         private->attrib = attrib;
4428
4429         dev_info(&device->cdev->dev,
4430                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4431                  private->attrib.operation, private->attrib.nr_cyl);
4432         return 0;
4433 }
4434
4435 /*
4436  * Issue syscall I/O to EMC Symmetrix array.
4437  * CCWs are PSF and RSSD
4438  */
4439 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4440 {
4441         struct dasd_symmio_parms usrparm;
4442         char *psf_data, *rssd_result;
4443         struct dasd_ccw_req *cqr;
4444         struct ccw1 *ccw;
4445         char psf0, psf1;
4446         int rc;
4447
4448         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4449                 return -EACCES;
4450         psf0 = psf1 = 0;
4451
4452         /* Copy parms from caller */
4453         rc = -EFAULT;
4454         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4455                 goto out;
4456         if (is_compat_task()) {
4457                 /* Make sure pointers are sane even on 31 bit. */
4458                 rc = -EINVAL;
4459                 if ((usrparm.psf_data >> 32) != 0)
4460                         goto out;
4461                 if ((usrparm.rssd_result >> 32) != 0)
4462                         goto out;
4463                 usrparm.psf_data &= 0x7fffffffULL;
4464                 usrparm.rssd_result &= 0x7fffffffULL;
4465         }
4466         /* alloc I/O data area */
4467         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4468         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4469         if (!psf_data || !rssd_result) {
4470                 rc = -ENOMEM;
4471                 goto out_free;
4472         }
4473
4474         /* get syscall header from user space */
4475         rc = -EFAULT;
4476         if (copy_from_user(psf_data,
4477                            (void __user *)(unsigned long) usrparm.psf_data,
4478                            usrparm.psf_data_len))
4479                 goto out_free;
4480         psf0 = psf_data[0];
4481         psf1 = psf_data[1];
4482
4483         /* setup CCWs for PSF + RSSD */
4484         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2, 0, device, NULL);
4485         if (IS_ERR(cqr)) {
4486                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4487                         "Could not allocate initialization request");
4488                 rc = PTR_ERR(cqr);
4489                 goto out_free;
4490         }
4491
4492         cqr->startdev = device;
4493         cqr->memdev = device;
4494         cqr->retries = 3;
4495         cqr->expires = 10 * HZ;
4496         cqr->buildclk = get_tod_clock();
4497         cqr->status = DASD_CQR_FILLED;
4498
4499         /* Build the ccws */
4500         ccw = cqr->cpaddr;
4501
4502         /* PSF ccw */
4503         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4504         ccw->count = usrparm.psf_data_len;
4505         ccw->flags |= CCW_FLAG_CC;
4506         ccw->cda = (__u32)(addr_t) psf_data;
4507
4508         ccw++;
4509
4510         /* RSSD ccw  */
4511         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4512         ccw->count = usrparm.rssd_result_len;
4513         ccw->flags = CCW_FLAG_SLI ;
4514         ccw->cda = (__u32)(addr_t) rssd_result;
4515
4516         rc = dasd_sleep_on(cqr);
4517         if (rc)
4518                 goto out_sfree;
4519
4520         rc = -EFAULT;
4521         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4522                            rssd_result, usrparm.rssd_result_len))
4523                 goto out_sfree;
4524         rc = 0;
4525
4526 out_sfree:
4527         dasd_sfree_request(cqr, cqr->memdev);
4528 out_free:
4529         kfree(rssd_result);
4530         kfree(psf_data);
4531 out:
4532         DBF_DEV_EVENT(DBF_WARNING, device,
4533                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4534                       (int) psf0, (int) psf1, rc);
4535         return rc;
4536 }
4537
4538 static int
4539 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4540 {
4541         struct dasd_device *device = block->base;
4542
4543         switch (cmd) {
4544         case BIODASDGATTR:
4545                 return dasd_eckd_get_attrib(device, argp);
4546         case BIODASDSATTR:
4547                 return dasd_eckd_set_attrib(device, argp);
4548         case BIODASDPSRD:
4549                 return dasd_eckd_performance(device, argp);
4550         case BIODASDRLSE:
4551                 return dasd_eckd_release(device);
4552         case BIODASDRSRV:
4553                 return dasd_eckd_reserve(device);
4554         case BIODASDSLCK:
4555                 return dasd_eckd_steal_lock(device);
4556         case BIODASDSNID:
4557                 return dasd_eckd_snid(device, argp);
4558         case BIODASDSYMMIO:
4559                 return dasd_symm_io(device, argp);
4560         default:
4561                 return -ENOTTY;
4562         }
4563 }
4564
4565 /*
4566  * Dump the range of CCWs into 'page' buffer
4567  * and return number of printed chars.
4568  */
4569 static int
4570 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4571 {
4572         int len, count;
4573         char *datap;
4574
4575         len = 0;
4576         while (from <= to) {
4577                 len += sprintf(page + len, PRINTK_HEADER
4578                                " CCW %p: %08X %08X DAT:",
4579                                from, ((int *) from)[0], ((int *) from)[1]);
4580
4581                 /* get pointer to data (consider IDALs) */
4582                 if (from->flags & CCW_FLAG_IDA)
4583                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4584                 else
4585                         datap = (char *) ((addr_t) from->cda);
4586
4587                 /* dump data (max 32 bytes) */
4588                 for (count = 0; count < from->count && count < 32; count++) {
4589                         if (count % 8 == 0) len += sprintf(page + len, " ");
4590                         if (count % 4 == 0) len += sprintf(page + len, " ");
4591                         len += sprintf(page + len, "%02x", datap[count]);
4592                 }
4593                 len += sprintf(page + len, "\n");
4594                 from++;
4595         }
4596         return len;
4597 }
4598
4599 static void
4600 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4601                          char *reason)
4602 {
4603         u64 *sense;
4604         u64 *stat;
4605
4606         sense = (u64 *) dasd_get_sense(irb);
4607         stat = (u64 *) &irb->scsw;
4608         if (sense) {
4609                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4610                               "%016llx %016llx %016llx %016llx",
4611                               reason, *stat, *((u32 *) (stat + 1)),
4612                               sense[0], sense[1], sense[2], sense[3]);
4613         } else {
4614                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4615                               reason, *stat, *((u32 *) (stat + 1)),
4616                               "NO VALID SENSE");
4617         }
4618 }
4619
4620 /*
4621  * Print sense data and related channel program.
4622  * Parts are printed because printk buffer is only 1024 bytes.
4623  */
4624 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4625                                  struct dasd_ccw_req *req, struct irb *irb)
4626 {
4627         char *page;
4628         struct ccw1 *first, *last, *fail, *from, *to;
4629         int len, sl, sct;
4630
4631         page = (char *) get_zeroed_page(GFP_ATOMIC);
4632         if (page == NULL) {
4633                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4634                               "No memory to dump sense data\n");
4635                 return;
4636         }
4637         /* dump the sense data */
4638         len = sprintf(page, PRINTK_HEADER
4639                       " I/O status report for device %s:\n",
4640                       dev_name(&device->cdev->dev));
4641         len += sprintf(page + len, PRINTK_HEADER
4642                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4643                        "CS:%02X RC:%d\n",
4644                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4645                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4646                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4647                        req ? req->intrc : 0);
4648         len += sprintf(page + len, PRINTK_HEADER
4649                        " device %s: Failing CCW: %p\n",
4650                        dev_name(&device->cdev->dev),
4651                        (void *) (addr_t) irb->scsw.cmd.cpa);
4652         if (irb->esw.esw0.erw.cons) {
4653                 for (sl = 0; sl < 4; sl++) {
4654                         len += sprintf(page + len, PRINTK_HEADER
4655                                        " Sense(hex) %2d-%2d:",
4656                                        (8 * sl), ((8 * sl) + 7));
4657
4658                         for (sct = 0; sct < 8; sct++) {
4659                                 len += sprintf(page + len, " %02x",
4660                                                irb->ecw[8 * sl + sct]);
4661                         }
4662                         len += sprintf(page + len, "\n");
4663                 }
4664
4665                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4666                         /* 24 Byte Sense Data */
4667                         sprintf(page + len, PRINTK_HEADER
4668                                 " 24 Byte: %x MSG %x, "
4669                                 "%s MSGb to SYSOP\n",
4670                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4671                                 irb->ecw[1] & 0x10 ? "" : "no");
4672                 } else {
4673                         /* 32 Byte Sense Data */
4674                         sprintf(page + len, PRINTK_HEADER
4675                                 " 32 Byte: Format: %x "
4676                                 "Exception class %x\n",
4677                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4678                 }
4679         } else {
4680                 sprintf(page + len, PRINTK_HEADER
4681                         " SORRY - NO VALID SENSE AVAILABLE\n");
4682         }
4683         printk(KERN_ERR "%s", page);
4684
4685         if (req) {
4686                 /* req == NULL for unsolicited interrupts */
4687                 /* dump the Channel Program (max 140 Bytes per line) */
4688                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4689                 first = req->cpaddr;
4690                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4691                 to = min(first + 6, last);
4692                 len = sprintf(page, PRINTK_HEADER
4693                               " Related CP in req: %p\n", req);
4694                 dasd_eckd_dump_ccw_range(first, to, page + len);
4695                 printk(KERN_ERR "%s", page);
4696
4697                 /* print failing CCW area (maximum 4) */
4698                 /* scsw->cda is either valid or zero  */
4699                 len = 0;
4700                 from = ++to;
4701                 fail = (struct ccw1 *)(addr_t)
4702                                 irb->scsw.cmd.cpa; /* failing CCW */
4703                 if (from <  fail - 2) {
4704                         from = fail - 2;     /* there is a gap - print header */
4705                         len += sprintf(page, PRINTK_HEADER "......\n");
4706                 }
4707                 to = min(fail + 1, last);
4708                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4709
4710                 /* print last CCWs (maximum 2) */
4711                 from = max(from, ++to);
4712                 if (from < last - 1) {
4713                         from = last - 1;     /* there is a gap - print header */
4714                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4715                 }
4716                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4717                 if (len > 0)
4718                         printk(KERN_ERR "%s", page);
4719         }
4720         free_page((unsigned long) page);
4721 }
4722
4723
4724 /*
4725  * Print sense data from a tcw.
4726  */
4727 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4728                                  struct dasd_ccw_req *req, struct irb *irb)
4729 {
4730         char *page;
4731         int len, sl, sct, residual;
4732         struct tsb *tsb;
4733         u8 *sense, *rcq;
4734
4735         page = (char *) get_zeroed_page(GFP_ATOMIC);
4736         if (page == NULL) {
4737                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4738                             "No memory to dump sense data");
4739                 return;
4740         }
4741         /* dump the sense data */
4742         len = sprintf(page, PRINTK_HEADER
4743                       " I/O status report for device %s:\n",
4744                       dev_name(&device->cdev->dev));
4745         len += sprintf(page + len, PRINTK_HEADER
4746                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4747                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4748                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4749                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4750                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4751                        irb->scsw.tm.fcxs,
4752                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4753                        req ? req->intrc : 0);
4754         len += sprintf(page + len, PRINTK_HEADER
4755                        " device %s: Failing TCW: %p\n",
4756                        dev_name(&device->cdev->dev),
4757                        (void *) (addr_t) irb->scsw.tm.tcw);
4758
4759         tsb = NULL;
4760         sense = NULL;
4761         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4762                 tsb = tcw_get_tsb(
4763                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4764
4765         if (tsb) {
4766                 len += sprintf(page + len, PRINTK_HEADER
4767                                " tsb->length %d\n", tsb->length);
4768                 len += sprintf(page + len, PRINTK_HEADER
4769                                " tsb->flags %x\n", tsb->flags);
4770                 len += sprintf(page + len, PRINTK_HEADER
4771                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4772                 len += sprintf(page + len, PRINTK_HEADER
4773                                " tsb->count %d\n", tsb->count);
4774                 residual = tsb->count - 28;
4775                 len += sprintf(page + len, PRINTK_HEADER
4776                                " residual %d\n", residual);
4777
4778                 switch (tsb->flags & 0x07) {
4779                 case 1: /* tsa_iostat */
4780                         len += sprintf(page + len, PRINTK_HEADER
4781                                " tsb->tsa.iostat.dev_time %d\n",
4782                                        tsb->tsa.iostat.dev_time);
4783                         len += sprintf(page + len, PRINTK_HEADER
4784                                " tsb->tsa.iostat.def_time %d\n",
4785                                        tsb->tsa.iostat.def_time);
4786                         len += sprintf(page + len, PRINTK_HEADER
4787                                " tsb->tsa.iostat.queue_time %d\n",
4788                                        tsb->tsa.iostat.queue_time);
4789                         len += sprintf(page + len, PRINTK_HEADER
4790                                " tsb->tsa.iostat.dev_busy_time %d\n",
4791                                        tsb->tsa.iostat.dev_busy_time);
4792                         len += sprintf(page + len, PRINTK_HEADER
4793                                " tsb->tsa.iostat.dev_act_time %d\n",
4794                                        tsb->tsa.iostat.dev_act_time);
4795                         sense = tsb->tsa.iostat.sense;
4796                         break;
4797                 case 2: /* ts_ddpc */
4798                         len += sprintf(page + len, PRINTK_HEADER
4799                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4800                         for (sl = 0; sl < 2; sl++) {
4801                                 len += sprintf(page + len, PRINTK_HEADER
4802                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4803                                                (8 * sl), ((8 * sl) + 7));
4804                                 rcq = tsb->tsa.ddpc.rcq;
4805                                 for (sct = 0; sct < 8; sct++) {
4806                                         len += sprintf(page + len, " %02x",
4807                                                        rcq[8 * sl + sct]);
4808                                 }
4809                                 len += sprintf(page + len, "\n");
4810                         }
4811                         sense = tsb->tsa.ddpc.sense;
4812                         break;
4813                 case 3: /* tsa_intrg */
4814                         len += sprintf(page + len, PRINTK_HEADER
4815                                       " tsb->tsa.intrg.: not supported yet\n");
4816                         break;
4817                 }
4818
4819                 if (sense) {
4820                         for (sl = 0; sl < 4; sl++) {
4821                                 len += sprintf(page + len, PRINTK_HEADER
4822                                                " Sense(hex) %2d-%2d:",
4823                                                (8 * sl), ((8 * sl) + 7));
4824                                 for (sct = 0; sct < 8; sct++) {
4825                                         len += sprintf(page + len, " %02x",
4826                                                        sense[8 * sl + sct]);
4827                                 }
4828                                 len += sprintf(page + len, "\n");
4829                         }
4830
4831                         if (sense[27] & DASD_SENSE_BIT_0) {
4832                                 /* 24 Byte Sense Data */
4833                                 sprintf(page + len, PRINTK_HEADER
4834                                         " 24 Byte: %x MSG %x, "
4835                                         "%s MSGb to SYSOP\n",
4836                                         sense[7] >> 4, sense[7] & 0x0f,
4837                                         sense[1] & 0x10 ? "" : "no");
4838                         } else {
4839                                 /* 32 Byte Sense Data */
4840                                 sprintf(page + len, PRINTK_HEADER
4841                                         " 32 Byte: Format: %x "
4842                                         "Exception class %x\n",
4843                                         sense[6] & 0x0f, sense[22] >> 4);
4844                         }
4845                 } else {
4846                         sprintf(page + len, PRINTK_HEADER
4847                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4848                 }
4849         } else {
4850                 sprintf(page + len, PRINTK_HEADER
4851                         " SORRY - NO TSB DATA AVAILABLE\n");
4852         }
4853         printk(KERN_ERR "%s", page);
4854         free_page((unsigned long) page);
4855 }
4856
4857 static void dasd_eckd_dump_sense(struct dasd_device *device,
4858                                  struct dasd_ccw_req *req, struct irb *irb)
4859 {
4860         u8 *sense = dasd_get_sense(irb);
4861
4862         if (scsw_is_tm(&irb->scsw)) {
4863                 /*
4864                  * In some cases the 'File Protected' or 'Incorrect Length'
4865                  * error might be expected and log messages shouldn't be written
4866                  * then. Check if the according suppress bit is set.
4867                  */
4868                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4869                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4870                         return;
4871                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4872                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4873                         return;
4874
4875                 dasd_eckd_dump_sense_tcw(device, req, irb);
4876         } else {
4877                 /*
4878                  * In some cases the 'Command Reject' or 'No Record Found'
4879                  * error might be expected and log messages shouldn't be
4880                  * written then. Check if the according suppress bit is set.
4881                  */
4882                 if (sense && sense[0] & SNS0_CMD_REJECT &&
4883                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4884                         return;
4885
4886                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4887                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4888                         return;
4889
4890                 dasd_eckd_dump_sense_ccw(device, req, irb);
4891         }
4892 }
4893
4894 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4895 {
4896         /*
4897          * the device should be disconnected from our LCU structure
4898          * on restore we will reconnect it and reread LCU specific
4899          * information like PAV support that might have changed
4900          */
4901         dasd_alias_remove_device(device);
4902         dasd_alias_disconnect_device_from_lcu(device);
4903
4904         return 0;
4905 }
4906
4907 static int dasd_eckd_restore_device(struct dasd_device *device)
4908 {
4909         struct dasd_eckd_private *private = device->private;
4910         struct dasd_eckd_characteristics temp_rdc_data;
4911         int rc;
4912         struct dasd_uid temp_uid;
4913         unsigned long flags;
4914         unsigned long cqr_flags = 0;
4915
4916         /* Read Configuration Data */
4917         rc = dasd_eckd_read_conf(device);
4918         if (rc) {
4919                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4920                                 "Read configuration data failed, rc=%d", rc);
4921                 goto out_err;
4922         }
4923
4924         dasd_eckd_get_uid(device, &temp_uid);
4925         /* Generate device unique id */
4926         rc = dasd_eckd_generate_uid(device);
4927         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4928         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4929                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4930                         "changed\n");
4931         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4932         if (rc)
4933                 goto out_err;
4934
4935         /* register lcu with alias handling, enable PAV if this is a new lcu */
4936         rc = dasd_alias_make_device_known_to_lcu(device);
4937         if (rc)
4938                 goto out_err;
4939
4940         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4941         dasd_eckd_validate_server(device, cqr_flags);
4942
4943         /* RE-Read Configuration Data */
4944         rc = dasd_eckd_read_conf(device);
4945         if (rc) {
4946                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4947                         "Read configuration data failed, rc=%d", rc);
4948                 goto out_err2;
4949         }
4950
4951         /* Read Feature Codes */
4952         dasd_eckd_read_features(device);
4953
4954         /* Read Device Characteristics */
4955         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4956                                          &temp_rdc_data, 64);
4957         if (rc) {
4958                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4959                                 "Read device characteristic failed, rc=%d", rc);
4960                 goto out_err2;
4961         }
4962         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4963         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4964         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4965
4966         /* add device to alias management */
4967         dasd_alias_add_device(device);
4968
4969         return 0;
4970
4971 out_err2:
4972         dasd_alias_disconnect_device_from_lcu(device);
4973 out_err:
4974         return -1;
4975 }
4976
4977 static int dasd_eckd_reload_device(struct dasd_device *device)
4978 {
4979         struct dasd_eckd_private *private = device->private;
4980         int rc, old_base;
4981         char print_uid[60];
4982         struct dasd_uid uid;
4983         unsigned long flags;
4984
4985         /*
4986          * remove device from alias handling to prevent new requests
4987          * from being scheduled on the wrong alias device
4988          */
4989         dasd_alias_remove_device(device);
4990
4991         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4992         old_base = private->uid.base_unit_addr;
4993         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4994
4995         /* Read Configuration Data */
4996         rc = dasd_eckd_read_conf(device);
4997         if (rc)
4998                 goto out_err;
4999
5000         rc = dasd_eckd_generate_uid(device);
5001         if (rc)
5002                 goto out_err;
5003         /*
5004          * update unit address configuration and
5005          * add device to alias management
5006          */
5007         dasd_alias_update_add_device(device);
5008
5009         dasd_eckd_get_uid(device, &uid);
5010
5011         if (old_base != uid.base_unit_addr) {
5012                 if (strlen(uid.vduit) > 0)
5013                         snprintf(print_uid, sizeof(print_uid),
5014                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5015                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5016                 else
5017                         snprintf(print_uid, sizeof(print_uid),
5018                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5019                                  uid.ssid, uid.base_unit_addr);
5020
5021                 dev_info(&device->cdev->dev,
5022                          "An Alias device was reassigned to a new base device "
5023                          "with UID: %s\n", print_uid);
5024         }
5025         return 0;
5026
5027 out_err:
5028         return -1;
5029 }
5030
5031 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5032                                          struct dasd_rssd_messages *messages,
5033                                          __u8 lpum)
5034 {
5035         struct dasd_rssd_messages *message_buf;
5036         struct dasd_psf_prssd_data *prssdp;
5037         struct dasd_ccw_req *cqr;
5038         struct ccw1 *ccw;
5039         int rc;
5040
5041         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5042                                    (sizeof(struct dasd_psf_prssd_data) +
5043                                     sizeof(struct dasd_rssd_messages)),
5044                                    device, NULL);
5045         if (IS_ERR(cqr)) {
5046                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5047                                 "Could not allocate read message buffer request");
5048                 return PTR_ERR(cqr);
5049         }
5050
5051         cqr->lpm = lpum;
5052 retry:
5053         cqr->startdev = device;
5054         cqr->memdev = device;
5055         cqr->block = NULL;
5056         cqr->expires = 10 * HZ;
5057         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5058         /* dasd_sleep_on_immediatly does not do complex error
5059          * recovery so clear erp flag and set retry counter to
5060          * do basic erp */
5061         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5062         cqr->retries = 256;
5063
5064         /* Prepare for Read Subsystem Data */
5065         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5066         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5067         prssdp->order = PSF_ORDER_PRSSD;
5068         prssdp->suborder = 0x03;        /* Message Buffer */
5069         /* all other bytes of prssdp must be zero */
5070
5071         ccw = cqr->cpaddr;
5072         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5073         ccw->count = sizeof(struct dasd_psf_prssd_data);
5074         ccw->flags |= CCW_FLAG_CC;
5075         ccw->flags |= CCW_FLAG_SLI;
5076         ccw->cda = (__u32)(addr_t) prssdp;
5077
5078         /* Read Subsystem Data - message buffer */
5079         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5080         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5081
5082         ccw++;
5083         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5084         ccw->count = sizeof(struct dasd_rssd_messages);
5085         ccw->flags |= CCW_FLAG_SLI;
5086         ccw->cda = (__u32)(addr_t) message_buf;
5087
5088         cqr->buildclk = get_tod_clock();
5089         cqr->status = DASD_CQR_FILLED;
5090         rc = dasd_sleep_on_immediatly(cqr);
5091         if (rc == 0) {
5092                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5093                 message_buf = (struct dasd_rssd_messages *)
5094                         (prssdp + 1);
5095                 memcpy(messages, message_buf,
5096                        sizeof(struct dasd_rssd_messages));
5097         } else if (cqr->lpm) {
5098                 /*
5099                  * on z/VM we might not be able to do I/O on the requested path
5100                  * but instead we get the required information on any path
5101                  * so retry with open path mask
5102                  */
5103                 cqr->lpm = 0;
5104                 goto retry;
5105         } else
5106                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5107                                 "Reading messages failed with rc=%d\n"
5108                                 , rc);
5109         dasd_sfree_request(cqr, cqr->memdev);
5110         return rc;
5111 }
5112
5113 static int dasd_eckd_query_host_access(struct dasd_device *device,
5114                                        struct dasd_psf_query_host_access *data)
5115 {
5116         struct dasd_eckd_private *private = device->private;
5117         struct dasd_psf_query_host_access *host_access;
5118         struct dasd_psf_prssd_data *prssdp;
5119         struct dasd_ccw_req *cqr;
5120         struct ccw1 *ccw;
5121         int rc;
5122
5123         /* not available for HYPER PAV alias devices */
5124         if (!device->block && private->lcu->pav == HYPER_PAV)
5125                 return -EOPNOTSUPP;
5126
5127         /* may not be supported by the storage server */
5128         if (!(private->features.feature[14] & 0x80))
5129                 return -EOPNOTSUPP;
5130
5131         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5132                                    sizeof(struct dasd_psf_prssd_data) + 1,
5133                                    device, NULL);
5134         if (IS_ERR(cqr)) {
5135                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5136                                 "Could not allocate read message buffer request");
5137                 return PTR_ERR(cqr);
5138         }
5139         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5140         if (!host_access) {
5141                 dasd_sfree_request(cqr, device);
5142                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5143                                 "Could not allocate host_access buffer");
5144                 return -ENOMEM;
5145         }
5146         cqr->startdev = device;
5147         cqr->memdev = device;
5148         cqr->block = NULL;
5149         cqr->retries = 256;
5150         cqr->expires = 10 * HZ;
5151
5152         /* Prepare for Read Subsystem Data */
5153         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5154         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5155         prssdp->order = PSF_ORDER_PRSSD;
5156         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5157         /* LSS and Volume that will be queried */
5158         prssdp->lss = private->ned->ID;
5159         prssdp->volume = private->ned->unit_addr;
5160         /* all other bytes of prssdp must be zero */
5161
5162         ccw = cqr->cpaddr;
5163         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5164         ccw->count = sizeof(struct dasd_psf_prssd_data);
5165         ccw->flags |= CCW_FLAG_CC;
5166         ccw->flags |= CCW_FLAG_SLI;
5167         ccw->cda = (__u32)(addr_t) prssdp;
5168
5169         /* Read Subsystem Data - query host access */
5170         ccw++;
5171         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5172         ccw->count = sizeof(struct dasd_psf_query_host_access);
5173         ccw->flags |= CCW_FLAG_SLI;
5174         ccw->cda = (__u32)(addr_t) host_access;
5175
5176         cqr->buildclk = get_tod_clock();
5177         cqr->status = DASD_CQR_FILLED;
5178         /* the command might not be supported, suppress error message */
5179         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5180         rc = dasd_sleep_on_interruptible(cqr);
5181         if (rc == 0) {
5182                 *data = *host_access;
5183         } else {
5184                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5185                                 "Reading host access data failed with rc=%d\n",
5186                                 rc);
5187                 rc = -EOPNOTSUPP;
5188         }
5189
5190         dasd_sfree_request(cqr, cqr->memdev);
5191         kfree(host_access);
5192         return rc;
5193 }
5194 /*
5195  * return number of grouped devices
5196  */
5197 static int dasd_eckd_host_access_count(struct dasd_device *device)
5198 {
5199         struct dasd_psf_query_host_access *access;
5200         struct dasd_ckd_path_group_entry *entry;
5201         struct dasd_ckd_host_information *info;
5202         int count = 0;
5203         int rc, i;
5204
5205         access = kzalloc(sizeof(*access), GFP_NOIO);
5206         if (!access) {
5207                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5208                                 "Could not allocate access buffer");
5209                 return -ENOMEM;
5210         }
5211         rc = dasd_eckd_query_host_access(device, access);
5212         if (rc) {
5213                 kfree(access);
5214                 return rc;
5215         }
5216
5217         info = (struct dasd_ckd_host_information *)
5218                 access->host_access_information;
5219         for (i = 0; i < info->entry_count; i++) {
5220                 entry = (struct dasd_ckd_path_group_entry *)
5221                         (info->entry + i * info->entry_size);
5222                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5223                         count++;
5224         }
5225
5226         kfree(access);
5227         return count;
5228 }
5229
5230 /*
5231  * write host access information to a sequential file
5232  */
5233 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5234 {
5235         struct dasd_psf_query_host_access *access;
5236         struct dasd_ckd_path_group_entry *entry;
5237         struct dasd_ckd_host_information *info;
5238         char sysplex[9] = "";
5239         int rc, i;
5240
5241         access = kzalloc(sizeof(*access), GFP_NOIO);
5242         if (!access) {
5243                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5244                                 "Could not allocate access buffer");
5245                 return -ENOMEM;
5246         }
5247         rc = dasd_eckd_query_host_access(device, access);
5248         if (rc) {
5249                 kfree(access);
5250                 return rc;
5251         }
5252
5253         info = (struct dasd_ckd_host_information *)
5254                 access->host_access_information;
5255         for (i = 0; i < info->entry_count; i++) {
5256                 entry = (struct dasd_ckd_path_group_entry *)
5257                         (info->entry + i * info->entry_size);
5258                 /* PGID */
5259                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
5260                 /* FLAGS */
5261                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5262                 /* SYSPLEX NAME */
5263                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5264                 EBCASC(sysplex, sizeof(sysplex));
5265                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5266                 /* SUPPORTED CYLINDER */
5267                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5268                 /* TIMESTAMP */
5269                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5270                            entry->timestamp);
5271         }
5272         kfree(access);
5273
5274         return 0;
5275 }
5276
5277 /*
5278  * Perform Subsystem Function - CUIR response
5279  */
5280 static int
5281 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5282                             __u32 message_id, __u8 lpum)
5283 {
5284         struct dasd_psf_cuir_response *psf_cuir;
5285         int pos = pathmask_to_pos(lpum);
5286         struct dasd_ccw_req *cqr;
5287         struct ccw1 *ccw;
5288         int rc;
5289
5290         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5291                                    sizeof(struct dasd_psf_cuir_response),
5292                                    device, NULL);
5293
5294         if (IS_ERR(cqr)) {
5295                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5296                            "Could not allocate PSF-CUIR request");
5297                 return PTR_ERR(cqr);
5298         }
5299
5300         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5301         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5302         psf_cuir->cc = response;
5303         psf_cuir->chpid = device->path[pos].chpid;
5304         psf_cuir->message_id = message_id;
5305         psf_cuir->cssid = device->path[pos].cssid;
5306         psf_cuir->ssid = device->path[pos].ssid;
5307         ccw = cqr->cpaddr;
5308         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5309         ccw->cda = (__u32)(addr_t)psf_cuir;
5310         ccw->flags = CCW_FLAG_SLI;
5311         ccw->count = sizeof(struct dasd_psf_cuir_response);
5312
5313         cqr->startdev = device;
5314         cqr->memdev = device;
5315         cqr->block = NULL;
5316         cqr->retries = 256;
5317         cqr->expires = 10*HZ;
5318         cqr->buildclk = get_tod_clock();
5319         cqr->status = DASD_CQR_FILLED;
5320         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5321
5322         rc = dasd_sleep_on(cqr);
5323
5324         dasd_sfree_request(cqr, cqr->memdev);
5325         return rc;
5326 }
5327
5328 /*
5329  * return configuration data that is referenced by record selector
5330  * if a record selector is specified or per default return the
5331  * conf_data pointer for the path specified by lpum
5332  */
5333 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5334                                                      __u8 lpum,
5335                                                      struct dasd_cuir_message *cuir)
5336 {
5337         struct dasd_conf_data *conf_data;
5338         int path, pos;
5339
5340         if (cuir->record_selector == 0)
5341                 goto out;
5342         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5343                 conf_data = device->path[pos].conf_data;
5344                 if (conf_data->gneq.record_selector ==
5345                     cuir->record_selector)
5346                         return conf_data;
5347         }
5348 out:
5349         return device->path[pathmask_to_pos(lpum)].conf_data;
5350 }
5351
5352 /*
5353  * This function determines the scope of a reconfiguration request by
5354  * analysing the path and device selection data provided in the CUIR request.
5355  * Returns a path mask containing CUIR affected paths for the give device.
5356  *
5357  * If the CUIR request does not contain the required information return the
5358  * path mask of the path the attention message for the CUIR request was reveived
5359  * on.
5360  */
5361 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5362                                 struct dasd_cuir_message *cuir)
5363 {
5364         struct dasd_conf_data *ref_conf_data;
5365         unsigned long bitmask = 0, mask = 0;
5366         struct dasd_conf_data *conf_data;
5367         unsigned int pos, path;
5368         char *ref_gneq, *gneq;
5369         char *ref_ned, *ned;
5370         int tbcpm = 0;
5371
5372         /* if CUIR request does not specify the scope use the path
5373            the attention message was presented on */
5374         if (!cuir->ned_map ||
5375             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5376                 return lpum;
5377
5378         /* get reference conf data */
5379         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5380         /* reference ned is determined by ned_map field */
5381         pos = 8 - ffs(cuir->ned_map);
5382         ref_ned = (char *)&ref_conf_data->neds[pos];
5383         ref_gneq = (char *)&ref_conf_data->gneq;
5384         /* transfer 24 bit neq_map to mask */
5385         mask = cuir->neq_map[2];
5386         mask |= cuir->neq_map[1] << 8;
5387         mask |= cuir->neq_map[0] << 16;
5388
5389         for (path = 0; path < 8; path++) {
5390                 /* initialise data per path */
5391                 bitmask = mask;
5392                 conf_data = device->path[path].conf_data;
5393                 pos = 8 - ffs(cuir->ned_map);
5394                 ned = (char *) &conf_data->neds[pos];
5395                 /* compare reference ned and per path ned */
5396                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5397                         continue;
5398                 gneq = (char *)&conf_data->gneq;
5399                 /* compare reference gneq and per_path gneq under
5400                    24 bit mask where mask bit 0 equals byte 7 of
5401                    the gneq and mask bit 24 equals byte 31 */
5402                 while (bitmask) {
5403                         pos = ffs(bitmask) - 1;
5404                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5405                             != 0)
5406                                 break;
5407                         clear_bit(pos, &bitmask);
5408                 }
5409                 if (bitmask)
5410                         continue;
5411                 /* device and path match the reference values
5412                    add path to CUIR scope */
5413                 tbcpm |= 0x80 >> path;
5414         }
5415         return tbcpm;
5416 }
5417
5418 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5419                                        unsigned long paths, int action)
5420 {
5421         int pos;
5422
5423         while (paths) {
5424                 /* get position of bit in mask */
5425                 pos = 8 - ffs(paths);
5426                 /* get channel path descriptor from this position */
5427                 if (action == CUIR_QUIESCE)
5428                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
5429                                 device->path[pos].cssid,
5430                                 device->path[pos].chpid);
5431                 else if (action == CUIR_RESUME)
5432                         pr_info("Path %x.%02x is back online after service on the storage server",
5433                                 device->path[pos].cssid,
5434                                 device->path[pos].chpid);
5435                 clear_bit(7 - pos, &paths);
5436         }
5437 }
5438
5439 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5440                                       struct dasd_cuir_message *cuir)
5441 {
5442         unsigned long tbcpm;
5443
5444         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5445         /* nothing to do if path is not in use */
5446         if (!(dasd_path_get_opm(device) & tbcpm))
5447                 return 0;
5448         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5449                 /* no path would be left if the CUIR action is taken
5450                    return error */
5451                 return -EINVAL;
5452         }
5453         /* remove device from operational path mask */
5454         dasd_path_remove_opm(device, tbcpm);
5455         dasd_path_add_cuirpm(device, tbcpm);
5456         return tbcpm;
5457 }
5458
5459 /*
5460  * walk through all devices and build a path mask to quiesce them
5461  * return an error if the last path to a device would be removed
5462  *
5463  * if only part of the devices are quiesced and an error
5464  * occurs no onlining necessary, the storage server will
5465  * notify the already set offline devices again
5466  */
5467 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5468                                   struct dasd_cuir_message *cuir)
5469 {
5470         struct dasd_eckd_private *private = device->private;
5471         struct alias_pav_group *pavgroup, *tempgroup;
5472         struct dasd_device *dev, *n;
5473         unsigned long paths = 0;
5474         unsigned long flags;
5475         int tbcpm;
5476
5477         /* active devices */
5478         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5479                                  alias_list) {
5480                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5481                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5482                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5483                 if (tbcpm < 0)
5484                         goto out_err;
5485                 paths |= tbcpm;
5486         }
5487         /* inactive devices */
5488         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5489                                  alias_list) {
5490                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5491                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5492                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5493                 if (tbcpm < 0)
5494                         goto out_err;
5495                 paths |= tbcpm;
5496         }
5497         /* devices in PAV groups */
5498         list_for_each_entry_safe(pavgroup, tempgroup,
5499                                  &private->lcu->grouplist, group) {
5500                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5501                                          alias_list) {
5502                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5503                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5504                         spin_unlock_irqrestore(
5505                                 get_ccwdev_lock(dev->cdev), flags);
5506                         if (tbcpm < 0)
5507                                 goto out_err;
5508                         paths |= tbcpm;
5509                 }
5510                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5511                                          alias_list) {
5512                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5513                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5514                         spin_unlock_irqrestore(
5515                                 get_ccwdev_lock(dev->cdev), flags);
5516                         if (tbcpm < 0)
5517                                 goto out_err;
5518                         paths |= tbcpm;
5519                 }
5520         }
5521         /* notify user about all paths affected by CUIR action */
5522         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5523         return 0;
5524 out_err:
5525         return tbcpm;
5526 }
5527
5528 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5529                                  struct dasd_cuir_message *cuir)
5530 {
5531         struct dasd_eckd_private *private = device->private;
5532         struct alias_pav_group *pavgroup, *tempgroup;
5533         struct dasd_device *dev, *n;
5534         unsigned long paths = 0;
5535         int tbcpm;
5536
5537         /*
5538          * the path may have been added through a generic path event before
5539          * only trigger path verification if the path is not already in use
5540          */
5541         list_for_each_entry_safe(dev, n,
5542                                  &private->lcu->active_devices,
5543                                  alias_list) {
5544                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5545                 paths |= tbcpm;
5546                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5547                         dasd_path_add_tbvpm(dev, tbcpm);
5548                         dasd_schedule_device_bh(dev);
5549                 }
5550         }
5551         list_for_each_entry_safe(dev, n,
5552                                  &private->lcu->inactive_devices,
5553                                  alias_list) {
5554                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5555                 paths |= tbcpm;
5556                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5557                         dasd_path_add_tbvpm(dev, tbcpm);
5558                         dasd_schedule_device_bh(dev);
5559                 }
5560         }
5561         /* devices in PAV groups */
5562         list_for_each_entry_safe(pavgroup, tempgroup,
5563                                  &private->lcu->grouplist,
5564                                  group) {
5565                 list_for_each_entry_safe(dev, n,
5566                                          &pavgroup->baselist,
5567                                          alias_list) {
5568                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5569                         paths |= tbcpm;
5570                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5571                                 dasd_path_add_tbvpm(dev, tbcpm);
5572                                 dasd_schedule_device_bh(dev);
5573                         }
5574                 }
5575                 list_for_each_entry_safe(dev, n,
5576                                          &pavgroup->aliaslist,
5577                                          alias_list) {
5578                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5579                         paths |= tbcpm;
5580                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5581                                 dasd_path_add_tbvpm(dev, tbcpm);
5582                                 dasd_schedule_device_bh(dev);
5583                         }
5584                 }
5585         }
5586         /* notify user about all paths affected by CUIR action */
5587         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5588         return 0;
5589 }
5590
5591 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5592                                  __u8 lpum)
5593 {
5594         struct dasd_cuir_message *cuir = messages;
5595         int response;
5596
5597         DBF_DEV_EVENT(DBF_WARNING, device,
5598                       "CUIR request: %016llx %016llx %016llx %08x",
5599                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5600                       ((u32 *)cuir)[3]);
5601
5602         if (cuir->code == CUIR_QUIESCE) {
5603                 /* quiesce */
5604                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5605                         response = PSF_CUIR_LAST_PATH;
5606                 else
5607                         response = PSF_CUIR_COMPLETED;
5608         } else if (cuir->code == CUIR_RESUME) {
5609                 /* resume */
5610                 dasd_eckd_cuir_resume(device, lpum, cuir);
5611                 response = PSF_CUIR_COMPLETED;
5612         } else
5613                 response = PSF_CUIR_NOT_SUPPORTED;
5614
5615         dasd_eckd_psf_cuir_response(device, response,
5616                                     cuir->message_id, lpum);
5617         DBF_DEV_EVENT(DBF_WARNING, device,
5618                       "CUIR response: %d on message ID %08x", response,
5619                       cuir->message_id);
5620         /* to make sure there is no attention left schedule work again */
5621         device->discipline->check_attention(device, lpum);
5622 }
5623
5624 static void dasd_eckd_check_attention_work(struct work_struct *work)
5625 {
5626         struct check_attention_work_data *data;
5627         struct dasd_rssd_messages *messages;
5628         struct dasd_device *device;
5629         int rc;
5630
5631         data = container_of(work, struct check_attention_work_data, worker);
5632         device = data->device;
5633         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5634         if (!messages) {
5635                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5636                               "Could not allocate attention message buffer");
5637                 goto out;
5638         }
5639         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5640         if (rc)
5641                 goto out;
5642         if (messages->length == ATTENTION_LENGTH_CUIR &&
5643             messages->format == ATTENTION_FORMAT_CUIR)
5644                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5645 out:
5646         dasd_put_device(device);
5647         kfree(messages);
5648         kfree(data);
5649 }
5650
5651 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5652 {
5653         struct check_attention_work_data *data;
5654
5655         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5656         if (!data)
5657                 return -ENOMEM;
5658         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5659         dasd_get_device(device);
5660         data->device = device;
5661         data->lpum = lpum;
5662         schedule_work(&data->worker);
5663         return 0;
5664 }
5665
5666 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5667 {
5668         if (~lpum & dasd_path_get_opm(device)) {
5669                 dasd_path_add_nohpfpm(device, lpum);
5670                 dasd_path_remove_opm(device, lpum);
5671                 dev_err(&device->cdev->dev,
5672                         "Channel path %02X lost HPF functionality and is disabled\n",
5673                         lpum);
5674                 return 1;
5675         }
5676         return 0;
5677 }
5678
5679 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5680 {
5681         struct dasd_eckd_private *private = device->private;
5682
5683         dev_err(&device->cdev->dev,
5684                 "High Performance FICON disabled\n");
5685         private->fcx_max_data = 0;
5686 }
5687
5688 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5689 {
5690         struct dasd_eckd_private *private = device->private;
5691
5692         return private->fcx_max_data ? 1 : 0;
5693 }
5694
5695 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5696                                        struct irb *irb)
5697 {
5698         struct dasd_eckd_private *private = device->private;
5699
5700         if (!private->fcx_max_data) {
5701                 /* sanity check for no HPF, the error makes no sense */
5702                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5703                               "Trying to disable HPF for a non HPF device");
5704                 return;
5705         }
5706         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5707                 dasd_eckd_disable_hpf_device(device);
5708         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5709                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5710                         return;
5711                 dasd_eckd_disable_hpf_device(device);
5712                 dasd_path_set_tbvpm(device,
5713                                   dasd_path_get_hpfpm(device));
5714         }
5715         /*
5716          * prevent that any new I/O ist started on the device and schedule a
5717          * requeue of existing requests
5718          */
5719         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5720         dasd_schedule_requeue(device);
5721 }
5722
5723 static struct ccw_driver dasd_eckd_driver = {
5724         .driver = {
5725                 .name   = "dasd-eckd",
5726                 .owner  = THIS_MODULE,
5727         },
5728         .ids         = dasd_eckd_ids,
5729         .probe       = dasd_eckd_probe,
5730         .remove      = dasd_generic_remove,
5731         .set_offline = dasd_generic_set_offline,
5732         .set_online  = dasd_eckd_set_online,
5733         .notify      = dasd_generic_notify,
5734         .path_event  = dasd_generic_path_event,
5735         .shutdown    = dasd_generic_shutdown,
5736         .freeze      = dasd_generic_pm_freeze,
5737         .thaw        = dasd_generic_restore_device,
5738         .restore     = dasd_generic_restore_device,
5739         .uc_handler  = dasd_generic_uc_handler,
5740         .int_class   = IRQIO_DAS,
5741 };
5742
5743 /*
5744  * max_blocks is dependent on the amount of storage that is available
5745  * in the static io buffer for each device. Currently each device has
5746  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5747  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5748  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5749  * addition we have one define extent ccw + 16 bytes of data and one
5750  * locate record ccw + 16 bytes of data. That makes:
5751  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5752  * We want to fit two into the available memory so that we can immediately
5753  * start the next request if one finishes off. That makes 249.5 blocks
5754  * for one request. Give a little safety and the result is 240.
5755  */
5756 static struct dasd_discipline dasd_eckd_discipline = {
5757         .owner = THIS_MODULE,
5758         .name = "ECKD",
5759         .ebcname = "ECKD",
5760         .max_blocks = 190,
5761         .check_device = dasd_eckd_check_characteristics,
5762         .uncheck_device = dasd_eckd_uncheck_device,
5763         .do_analysis = dasd_eckd_do_analysis,
5764         .verify_path = dasd_eckd_verify_path,
5765         .basic_to_ready = dasd_eckd_basic_to_ready,
5766         .online_to_ready = dasd_eckd_online_to_ready,
5767         .basic_to_known = dasd_eckd_basic_to_known,
5768         .fill_geometry = dasd_eckd_fill_geometry,
5769         .start_IO = dasd_start_IO,
5770         .term_IO = dasd_term_IO,
5771         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5772         .format_device = dasd_eckd_format_device,
5773         .check_device_format = dasd_eckd_check_device_format,
5774         .erp_action = dasd_eckd_erp_action,
5775         .erp_postaction = dasd_eckd_erp_postaction,
5776         .check_for_device_change = dasd_eckd_check_for_device_change,
5777         .build_cp = dasd_eckd_build_alias_cp,
5778         .free_cp = dasd_eckd_free_alias_cp,
5779         .dump_sense = dasd_eckd_dump_sense,
5780         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5781         .fill_info = dasd_eckd_fill_info,
5782         .ioctl = dasd_eckd_ioctl,
5783         .freeze = dasd_eckd_pm_freeze,
5784         .restore = dasd_eckd_restore_device,
5785         .reload = dasd_eckd_reload_device,
5786         .get_uid = dasd_eckd_get_uid,
5787         .kick_validate = dasd_eckd_kick_validate_server,
5788         .check_attention = dasd_eckd_check_attention,
5789         .host_access_count = dasd_eckd_host_access_count,
5790         .hosts_print = dasd_hosts_print,
5791         .handle_hpf_error = dasd_eckd_handle_hpf_error,
5792         .disable_hpf = dasd_eckd_disable_hpf_device,
5793         .hpf_enabled = dasd_eckd_hpf_enabled,
5794         .reset_path = dasd_eckd_reset_path,
5795 };
5796
5797 static int __init
5798 dasd_eckd_init(void)
5799 {
5800         int ret;
5801
5802         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5803         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5804                                    GFP_KERNEL | GFP_DMA);
5805         if (!dasd_reserve_req)
5806                 return -ENOMEM;
5807         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5808                                    GFP_KERNEL | GFP_DMA);
5809         if (!path_verification_worker) {
5810                 kfree(dasd_reserve_req);
5811                 return -ENOMEM;
5812         }
5813         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5814         if (!rawpadpage) {
5815                 kfree(path_verification_worker);
5816                 kfree(dasd_reserve_req);
5817                 return -ENOMEM;
5818         }
5819         ret = ccw_driver_register(&dasd_eckd_driver);
5820         if (!ret)
5821                 wait_for_device_probe();
5822         else {
5823                 kfree(path_verification_worker);
5824                 kfree(dasd_reserve_req);
5825                 free_page((unsigned long)rawpadpage);
5826         }
5827         return ret;
5828 }
5829
5830 static void __exit
5831 dasd_eckd_cleanup(void)
5832 {
5833         ccw_driver_unregister(&dasd_eckd_driver);
5834         kfree(path_verification_worker);
5835         kfree(dasd_reserve_req);
5836         free_page((unsigned long)rawpadpage);
5837 }
5838
5839 module_init(dasd_eckd_init);
5840 module_exit(dasd_eckd_cleanup);