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);
 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);
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);
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         if (IS_ERR(cqr))
1820                 return cqr;
1821         ccw = cqr->cpaddr;
1822         /* Define extent for the first 3 tracks. */
1823         define_extent(ccw++, cqr->data, 0, 2,
1824                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1825         LO_data = cqr->data + sizeof(struct DE_eckd_data);
1826         /* Locate record for the first 4 records on track 0. */
1827         ccw[-1].flags |= CCW_FLAG_CC;
1828         locate_record(ccw++, LO_data++, 0, 0, 4,
1829                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1830
1831         count_data = private->count_area;
1832         for (i = 0; i < 4; i++) {
1833                 ccw[-1].flags |= CCW_FLAG_CC;
1834                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1835                 ccw->flags = 0;
1836                 ccw->count = 8;
1837                 ccw->cda = (__u32)(addr_t) count_data;
1838                 ccw++;
1839                 count_data++;
1840         }
1841
1842         /* Locate record for the first record on track 2. */
1843         ccw[-1].flags |= CCW_FLAG_CC;
1844         locate_record(ccw++, LO_data++, 2, 0, 1,
1845                       DASD_ECKD_CCW_READ_COUNT, device, 0);
1846         /* Read count ccw. */
1847         ccw[-1].flags |= CCW_FLAG_CC;
1848         ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
1849         ccw->flags = 0;
1850         ccw->count = 8;
1851         ccw->cda = (__u32)(addr_t) count_data;
1852
1853         cqr->block = NULL;
1854         cqr->startdev = device;
1855         cqr->memdev = device;
1856         cqr->retries = 255;
1857         cqr->buildclk = get_tod_clock();
1858         cqr->status = DASD_CQR_FILLED;
1859         return cqr;
1860 }
1861
1862 /* differentiate between 'no record found' and any other error */
1863 static int dasd_eckd_analysis_evaluation(struct dasd_ccw_req *init_cqr)
1864 {
1865         char *sense;
1866         if (init_cqr->status == DASD_CQR_DONE)
1867                 return INIT_CQR_OK;
1868         else if (init_cqr->status == DASD_CQR_NEED_ERP ||
1869                  init_cqr->status == DASD_CQR_FAILED) {
1870                 sense = dasd_get_sense(&init_cqr->irb);
1871                 if (sense && (sense[1] & SNS1_NO_REC_FOUND))
1872                         return INIT_CQR_UNFORMATTED;
1873                 else
1874                         return INIT_CQR_ERROR;
1875         } else
1876                 return INIT_CQR_ERROR;
1877 }
1878
1879 /*
1880  * This is the callback function for the init_analysis cqr. It saves
1881  * the status of the initial analysis ccw before it frees it and kicks
1882  * the device to continue the startup sequence. This will call
1883  * dasd_eckd_do_analysis again (if the devices has not been marked
1884  * for deletion in the meantime).
1885  */
1886 static void dasd_eckd_analysis_callback(struct dasd_ccw_req *init_cqr,
1887                                         void *data)
1888 {
1889         struct dasd_device *device = init_cqr->startdev;
1890         struct dasd_eckd_private *private = device->private;
1891
1892         private->init_cqr_status = dasd_eckd_analysis_evaluation(init_cqr);
1893         dasd_sfree_request(init_cqr, device);
1894         dasd_kick_device(device);
1895 }
1896
1897 static int dasd_eckd_start_analysis(struct dasd_block *block)
1898 {
1899         struct dasd_ccw_req *init_cqr;
1900
1901         init_cqr = dasd_eckd_analysis_ccw(block->base);
1902         if (IS_ERR(init_cqr))
1903                 return PTR_ERR(init_cqr);
1904         init_cqr->callback = dasd_eckd_analysis_callback;
1905         init_cqr->callback_data = NULL;
1906         init_cqr->expires = 5*HZ;
1907         /* first try without ERP, so we can later handle unformatted
1908          * devices as special case
1909          */
1910         clear_bit(DASD_CQR_FLAGS_USE_ERP, &init_cqr->flags);
1911         init_cqr->retries = 0;
1912         dasd_add_request_head(init_cqr);
1913         return -EAGAIN;
1914 }
1915
1916 static int dasd_eckd_end_analysis(struct dasd_block *block)
1917 {
1918         struct dasd_device *device = block->base;
1919         struct dasd_eckd_private *private = device->private;
1920         struct eckd_count *count_area;
1921         unsigned int sb, blk_per_trk;
1922         int status, i;
1923         struct dasd_ccw_req *init_cqr;
1924
1925         status = private->init_cqr_status;
1926         private->init_cqr_status = -1;
1927         if (status == INIT_CQR_ERROR) {
1928                 /* try again, this time with full ERP */
1929                 init_cqr = dasd_eckd_analysis_ccw(device);
1930                 dasd_sleep_on(init_cqr);
1931                 status = dasd_eckd_analysis_evaluation(init_cqr);
1932                 dasd_sfree_request(init_cqr, device);
1933         }
1934
1935         if (device->features & DASD_FEATURE_USERAW) {
1936                 block->bp_block = DASD_RAW_BLOCKSIZE;
1937                 blk_per_trk = DASD_RAW_BLOCK_PER_TRACK;
1938                 block->s2b_shift = 3;
1939                 goto raw;
1940         }
1941
1942         if (status == INIT_CQR_UNFORMATTED) {
1943                 dev_warn(&device->cdev->dev, "The DASD is not formatted\n");
1944                 return -EMEDIUMTYPE;
1945         } else if (status == INIT_CQR_ERROR) {
1946                 dev_err(&device->cdev->dev,
1947                         "Detecting the DASD disk layout failed because "
1948                         "of an I/O error\n");
1949                 return -EIO;
1950         }
1951
1952         private->uses_cdl = 1;
1953         /* Check Track 0 for Compatible Disk Layout */
1954         count_area = NULL;
1955         for (i = 0; i < 3; i++) {
1956                 if (private->count_area[i].kl != 4 ||
1957                     private->count_area[i].dl != dasd_eckd_cdl_reclen(i) - 4 ||
1958                     private->count_area[i].cyl != 0 ||
1959                     private->count_area[i].head != count_area_head[i] ||
1960                     private->count_area[i].record != count_area_rec[i]) {
1961                         private->uses_cdl = 0;
1962                         break;
1963                 }
1964         }
1965         if (i == 3)
1966                 count_area = &private->count_area[4];
1967
1968         if (private->uses_cdl == 0) {
1969                 for (i = 0; i < 5; i++) {
1970                         if ((private->count_area[i].kl != 0) ||
1971                             (private->count_area[i].dl !=
1972                              private->count_area[0].dl) ||
1973                             private->count_area[i].cyl !=  0 ||
1974                             private->count_area[i].head != count_area_head[i] ||
1975                             private->count_area[i].record != count_area_rec[i])
1976                                 break;
1977                 }
1978                 if (i == 5)
1979                         count_area = &private->count_area[0];
1980         } else {
1981                 if (private->count_area[3].record == 1)
1982                         dev_warn(&device->cdev->dev,
1983                                  "Track 0 has no records following the VTOC\n");
1984         }
1985
1986         if (count_area != NULL && count_area->kl == 0) {
1987                 /* we found notthing violating our disk layout */
1988                 if (dasd_check_blocksize(count_area->dl) == 0)
1989                         block->bp_block = count_area->dl;
1990         }
1991         if (block->bp_block == 0) {
1992                 dev_warn(&device->cdev->dev,
1993                          "The disk layout of the DASD is not supported\n");
1994                 return -EMEDIUMTYPE;
1995         }
1996         block->s2b_shift = 0;   /* bits to shift 512 to get a block */
1997         for (sb = 512; sb < block->bp_block; sb = sb << 1)
1998                 block->s2b_shift++;
1999
2000         blk_per_trk = recs_per_track(&private->rdc_data, 0, block->bp_block);
2001
2002 raw:
2003         block->blocks = (private->real_cyl *
2004                           private->rdc_data.trk_per_cyl *
2005                           blk_per_trk);
2006
2007         dev_info(&device->cdev->dev,
2008                  "DASD with %d KB/block, %d KB total size, %d KB/track, "
2009                  "%s\n", (block->bp_block >> 10),
2010                  ((private->real_cyl *
2011                    private->rdc_data.trk_per_cyl *
2012                    blk_per_trk * (block->bp_block >> 9)) >> 1),
2013                  ((blk_per_trk * block->bp_block) >> 10),
2014                  private->uses_cdl ?
2015                  "compatible disk layout" : "linux disk layout");
2016
2017         return 0;
2018 }
2019
2020 static int dasd_eckd_do_analysis(struct dasd_block *block)
2021 {
2022         struct dasd_eckd_private *private = block->base->private;
2023
2024         if (private->init_cqr_status < 0)
2025                 return dasd_eckd_start_analysis(block);
2026         else
2027                 return dasd_eckd_end_analysis(block);
2028 }
2029
2030 static int dasd_eckd_basic_to_ready(struct dasd_device *device)
2031 {
2032         return dasd_alias_add_device(device);
2033 };
2034
2035 static int dasd_eckd_online_to_ready(struct dasd_device *device)
2036 {
2037         cancel_work_sync(&device->reload_device);
2038         cancel_work_sync(&device->kick_validate);
2039         return 0;
2040 };
2041
2042 static int dasd_eckd_basic_to_known(struct dasd_device *device)
2043 {
2044         return dasd_alias_remove_device(device);
2045 };
2046
2047 static int
2048 dasd_eckd_fill_geometry(struct dasd_block *block, struct hd_geometry *geo)
2049 {
2050         struct dasd_eckd_private *private = block->base->private;
2051
2052         if (dasd_check_blocksize(block->bp_block) == 0) {
2053                 geo->sectors = recs_per_track(&private->rdc_data,
2054                                               0, block->bp_block);
2055         }
2056         geo->cylinders = private->rdc_data.no_cyl;
2057         geo->heads = private->rdc_data.trk_per_cyl;
2058         return 0;
2059 }
2060
2061 /*
2062  * Build the TCW request for the format check
2063  */
2064 static struct dasd_ccw_req *
2065 dasd_eckd_build_check_tcw(struct dasd_device *base, struct format_data_t *fdata,
2066                           int enable_pav, struct eckd_count *fmt_buffer,
2067                           int rpt)
2068 {
2069         struct dasd_eckd_private *start_priv;
2070         struct dasd_device *startdev = NULL;
2071         struct tidaw *last_tidaw = NULL;
2072         struct dasd_ccw_req *cqr;
2073         struct itcw *itcw;
2074         int itcw_size;
2075         int count;
2076         int rc;
2077         int i;
2078
2079         if (enable_pav)
2080                 startdev = dasd_alias_get_start_dev(base);
2081
2082         if (!startdev)
2083                 startdev = base;
2084
2085         start_priv = startdev->private;
2086
2087         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2088
2089         /*
2090          * we're adding 'count' amount of tidaw to the itcw.
2091          * calculate the corresponding itcw_size
2092          */
2093         itcw_size = itcw_calc_size(0, count, 0);
2094
2095         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
2096         if (IS_ERR(cqr))
2097                 return cqr;
2098
2099         start_priv->count++;
2100
2101         itcw = itcw_init(cqr->data, itcw_size, ITCW_OP_READ, 0, count, 0);
2102         if (IS_ERR(itcw)) {
2103                 rc = -EINVAL;
2104                 goto out_err;
2105         }
2106
2107         cqr->cpaddr = itcw_get_tcw(itcw);
2108         rc = prepare_itcw(itcw, fdata->start_unit, fdata->stop_unit,
2109                           DASD_ECKD_CCW_READ_COUNT_MT, base, startdev, 0, count,
2110                           sizeof(struct eckd_count),
2111                           count * sizeof(struct eckd_count), 0, rpt);
2112         if (rc)
2113                 goto out_err;
2114
2115         for (i = 0; i < count; i++) {
2116                 last_tidaw = itcw_add_tidaw(itcw, 0, fmt_buffer++,
2117                                             sizeof(struct eckd_count));
2118                 if (IS_ERR(last_tidaw)) {
2119                         rc = -EINVAL;
2120                         goto out_err;
2121                 }
2122         }
2123
2124         last_tidaw->flags |= TIDAW_FLAGS_LAST;
2125         itcw_finalize(itcw);
2126
2127         cqr->cpmode = 1;
2128         cqr->startdev = startdev;
2129         cqr->memdev = startdev;
2130         cqr->basedev = base;
2131         cqr->retries = startdev->default_retries;
2132         cqr->expires = startdev->default_expires * HZ;
2133         cqr->buildclk = get_tod_clock();
2134         cqr->status = DASD_CQR_FILLED;
2135         /* Set flags to suppress output for expected errors */
2136         set_bit(DASD_CQR_SUPPRESS_FP, &cqr->flags);
2137         set_bit(DASD_CQR_SUPPRESS_IL, &cqr->flags);
2138
2139         return cqr;
2140
2141 out_err:
2142         dasd_sfree_request(cqr, startdev);
2143
2144         return ERR_PTR(rc);
2145 }
2146
2147 /*
2148  * Build the CCW request for the format check
2149  */
2150 static struct dasd_ccw_req *
2151 dasd_eckd_build_check(struct dasd_device *base, struct format_data_t *fdata,
2152                       int enable_pav, struct eckd_count *fmt_buffer, int rpt)
2153 {
2154         struct dasd_eckd_private *start_priv;
2155         struct dasd_eckd_private *base_priv;
2156         struct dasd_device *startdev = NULL;
2157         struct dasd_ccw_req *cqr;
2158         struct ccw1 *ccw;
2159         void *data;
2160         int cplength, datasize;
2161         int use_prefix;
2162         int count;
2163         int i;
2164
2165         if (enable_pav)
2166                 startdev = dasd_alias_get_start_dev(base);
2167
2168         if (!startdev)
2169                 startdev = base;
2170
2171         start_priv = startdev->private;
2172         base_priv = base->private;
2173
2174         count = rpt * (fdata->stop_unit - fdata->start_unit + 1);
2175
2176         use_prefix = base_priv->features.feature[8] & 0x01;
2177
2178         if (use_prefix) {
2179                 cplength = 1;
2180                 datasize = sizeof(struct PFX_eckd_data);
2181         } else {
2182                 cplength = 2;
2183                 datasize = sizeof(struct DE_eckd_data) +
2184                         sizeof(struct LO_eckd_data);
2185         }
2186         cplength += count;
2187
2188         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
2189                                   startdev);
2190         if (IS_ERR(cqr))
2191                 return cqr;
2192
2193         start_priv->count++;
2194         data = cqr->data;
2195         ccw = cqr->cpaddr;
2196
2197         if (use_prefix) {
2198                 prefix_LRE(ccw++, data, fdata->start_unit, fdata->stop_unit,
2199                            DASD_ECKD_CCW_READ_COUNT, base, startdev, 1, 0,
2200                            count, 0, 0);
2201         } else {
2202                 define_extent(ccw++, data, fdata->start_unit, fdata->stop_unit,
2203                               DASD_ECKD_CCW_READ_COUNT, startdev, 0);
2204
2205                 data += sizeof(struct DE_eckd_data);
2206                 ccw[-1].flags |= CCW_FLAG_CC;
2207
2208                 locate_record(ccw++, data, fdata->start_unit, 0, count,
2209                               DASD_ECKD_CCW_READ_COUNT, base, 0);
2210         }
2211
2212         for (i = 0; i < count; i++) {
2213                 ccw[-1].flags |= CCW_FLAG_CC;
2214                 ccw->cmd_code = DASD_ECKD_CCW_READ_COUNT;
2215                 ccw->flags = CCW_FLAG_SLI;
2216                 ccw->count = 8;
2217                 ccw->cda = (__u32)(addr_t) fmt_buffer;
2218                 ccw++;
2219                 fmt_buffer++;
2220         }
2221
2222         cqr->startdev = startdev;
2223         cqr->memdev = startdev;
2224         cqr->basedev = base;
2225         cqr->retries = DASD_RETRIES;
2226         cqr->expires = startdev->default_expires * HZ;
2227         cqr->buildclk = get_tod_clock();
2228         cqr->status = DASD_CQR_FILLED;
2229         /* Set flags to suppress output for expected errors */
2230         set_bit(DASD_CQR_SUPPRESS_NRF, &cqr->flags);
2231
2232         return cqr;
2233 }
2234
2235 static struct dasd_ccw_req *
2236 dasd_eckd_build_format(struct dasd_device *base,
2237                        struct format_data_t *fdata,
2238                        int enable_pav)
2239 {
2240         struct dasd_eckd_private *base_priv;
2241         struct dasd_eckd_private *start_priv;
2242         struct dasd_device *startdev = NULL;
2243         struct dasd_ccw_req *fcp;
2244         struct eckd_count *ect;
2245         struct ch_t address;
2246         struct ccw1 *ccw;
2247         void *data;
2248         int rpt;
2249         int cplength, datasize;
2250         int i, j;
2251         int intensity = 0;
2252         int r0_perm;
2253         int nr_tracks;
2254         int use_prefix;
2255
2256         if (enable_pav)
2257                 startdev = dasd_alias_get_start_dev(base);
2258
2259         if (!startdev)
2260                 startdev = base;
2261
2262         start_priv = startdev->private;
2263         base_priv = base->private;
2264
2265         rpt = recs_per_track(&base_priv->rdc_data, 0, fdata->blksize);
2266
2267         nr_tracks = fdata->stop_unit - fdata->start_unit + 1;
2268
2269         /*
2270          * fdata->intensity is a bit string that tells us what to do:
2271          *   Bit 0: write record zero
2272          *   Bit 1: write home address, currently not supported
2273          *   Bit 2: invalidate tracks
2274          *   Bit 3: use OS/390 compatible disk layout (cdl)
2275          *   Bit 4: do not allow storage subsystem to modify record zero
2276          * Only some bit combinations do make sense.
2277          */
2278         if (fdata->intensity & 0x10) {
2279                 r0_perm = 0;
2280                 intensity = fdata->intensity & ~0x10;
2281         } else {
2282                 r0_perm = 1;
2283                 intensity = fdata->intensity;
2284         }
2285
2286         use_prefix = base_priv->features.feature[8] & 0x01;
2287
2288         switch (intensity) {
2289         case 0x00:      /* Normal format */
2290         case 0x08:      /* Normal format, use cdl. */
2291                 cplength = 2 + (rpt*nr_tracks);
2292                 if (use_prefix)
2293                         datasize = sizeof(struct PFX_eckd_data) +
2294                                 sizeof(struct LO_eckd_data) +
2295                                 rpt * nr_tracks * sizeof(struct eckd_count);
2296                 else
2297                         datasize = sizeof(struct DE_eckd_data) +
2298                                 sizeof(struct LO_eckd_data) +
2299                                 rpt * nr_tracks * sizeof(struct eckd_count);
2300                 break;
2301         case 0x01:      /* Write record zero and format track. */
2302         case 0x09:      /* Write record zero and format track, use cdl. */
2303                 cplength = 2 + rpt * nr_tracks;
2304                 if (use_prefix)
2305                         datasize = sizeof(struct PFX_eckd_data) +
2306                                 sizeof(struct LO_eckd_data) +
2307                                 sizeof(struct eckd_count) +
2308                                 rpt * nr_tracks * sizeof(struct eckd_count);
2309                 else
2310                         datasize = sizeof(struct DE_eckd_data) +
2311                                 sizeof(struct LO_eckd_data) +
2312                                 sizeof(struct eckd_count) +
2313                                 rpt * nr_tracks * sizeof(struct eckd_count);
2314                 break;
2315         case 0x04:      /* Invalidate track. */
2316         case 0x0c:      /* Invalidate track, use cdl. */
2317                 cplength = 3;
2318                 if (use_prefix)
2319                         datasize = sizeof(struct PFX_eckd_data) +
2320                                 sizeof(struct LO_eckd_data) +
2321                                 sizeof(struct eckd_count);
2322                 else
2323                         datasize = sizeof(struct DE_eckd_data) +
2324                                 sizeof(struct LO_eckd_data) +
2325                                 sizeof(struct eckd_count);
2326                 break;
2327         default:
2328                 dev_warn(&startdev->cdev->dev,
2329                          "An I/O control call used incorrect flags 0x%x\n",
2330                          fdata->intensity);
2331                 return ERR_PTR(-EINVAL);
2332         }
2333         /* Allocate the format ccw request. */
2334         fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
2335                                    datasize, startdev);
2336         if (IS_ERR(fcp))
2337                 return fcp;
2338
2339         start_priv->count++;
2340         data = fcp->data;
2341         ccw = fcp->cpaddr;
2342
2343         switch (intensity & ~0x08) {
2344         case 0x00: /* Normal format. */
2345                 if (use_prefix) {
2346                         prefix(ccw++, (struct PFX_eckd_data *) data,
2347                                fdata->start_unit, fdata->stop_unit,
2348                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2349                         /* grant subsystem permission to format R0 */
2350                         if (r0_perm)
2351                                 ((struct PFX_eckd_data *)data)
2352                                         ->define_extent.ga_extended |= 0x04;
2353                         data += sizeof(struct PFX_eckd_data);
2354                 } else {
2355                         define_extent(ccw++, (struct DE_eckd_data *) data,
2356                                       fdata->start_unit, fdata->stop_unit,
2357                                       DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2358                         /* grant subsystem permission to format R0 */
2359                         if (r0_perm)
2360                                 ((struct DE_eckd_data *) data)
2361                                         ->ga_extended |= 0x04;
2362                         data += sizeof(struct DE_eckd_data);
2363                 }
2364                 ccw[-1].flags |= CCW_FLAG_CC;
2365                 locate_record(ccw++, (struct LO_eckd_data *) data,
2366                               fdata->start_unit, 0, rpt*nr_tracks,
2367                               DASD_ECKD_CCW_WRITE_CKD, base,
2368                               fdata->blksize);
2369                 data += sizeof(struct LO_eckd_data);
2370                 break;
2371         case 0x01: /* Write record zero + format track. */
2372                 if (use_prefix) {
2373                         prefix(ccw++, (struct PFX_eckd_data *) data,
2374                                fdata->start_unit, fdata->stop_unit,
2375                                DASD_ECKD_CCW_WRITE_RECORD_ZERO,
2376                                base, startdev);
2377                         data += sizeof(struct PFX_eckd_data);
2378                 } else {
2379                         define_extent(ccw++, (struct DE_eckd_data *) data,
2380                                fdata->start_unit, fdata->stop_unit,
2381                                DASD_ECKD_CCW_WRITE_RECORD_ZERO, startdev, 0);
2382                         data += sizeof(struct DE_eckd_data);
2383                 }
2384                 ccw[-1].flags |= CCW_FLAG_CC;
2385                 locate_record(ccw++, (struct LO_eckd_data *) data,
2386                               fdata->start_unit, 0, rpt * nr_tracks + 1,
2387                               DASD_ECKD_CCW_WRITE_RECORD_ZERO, base,
2388                               base->block->bp_block);
2389                 data += sizeof(struct LO_eckd_data);
2390                 break;
2391         case 0x04: /* Invalidate track. */
2392                 if (use_prefix) {
2393                         prefix(ccw++, (struct PFX_eckd_data *) data,
2394                                fdata->start_unit, fdata->stop_unit,
2395                                DASD_ECKD_CCW_WRITE_CKD, base, startdev);
2396                         data += sizeof(struct PFX_eckd_data);
2397                 } else {
2398                         define_extent(ccw++, (struct DE_eckd_data *) data,
2399                                fdata->start_unit, fdata->stop_unit,
2400                                DASD_ECKD_CCW_WRITE_CKD, startdev, 0);
2401                         data += sizeof(struct DE_eckd_data);
2402                 }
2403                 ccw[-1].flags |= CCW_FLAG_CC;
2404                 locate_record(ccw++, (struct LO_eckd_data *) data,
2405                               fdata->start_unit, 0, 1,
2406                               DASD_ECKD_CCW_WRITE_CKD, base, 8);
2407                 data += sizeof(struct LO_eckd_data);
2408                 break;
2409         }
2410
2411         for (j = 0; j < nr_tracks; j++) {
2412                 /* calculate cylinder and head for the current track */
2413                 set_ch_t(&address,
2414                          (fdata->start_unit + j) /
2415                          base_priv->rdc_data.trk_per_cyl,
2416                          (fdata->start_unit + j) %
2417                          base_priv->rdc_data.trk_per_cyl);
2418                 if (intensity & 0x01) { /* write record zero */
2419                         ect = (struct eckd_count *) data;
2420                         data += sizeof(struct eckd_count);
2421                         ect->cyl = address.cyl;
2422                         ect->head = address.head;
2423                         ect->record = 0;
2424                         ect->kl = 0;
2425                         ect->dl = 8;
2426                         ccw[-1].flags |= CCW_FLAG_CC;
2427                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_RECORD_ZERO;
2428                         ccw->flags = CCW_FLAG_SLI;
2429                         ccw->count = 8;
2430                         ccw->cda = (__u32)(addr_t) ect;
2431                         ccw++;
2432                 }
2433                 if ((intensity & ~0x08) & 0x04) {       /* erase track */
2434                         ect = (struct eckd_count *) data;
2435                         data += sizeof(struct eckd_count);
2436                         ect->cyl = address.cyl;
2437                         ect->head = address.head;
2438                         ect->record = 1;
2439                         ect->kl = 0;
2440                         ect->dl = 0;
2441                         ccw[-1].flags |= CCW_FLAG_CC;
2442                         ccw->cmd_code = DASD_ECKD_CCW_WRITE_CKD;
2443                         ccw->flags = CCW_FLAG_SLI;
2444                         ccw->count = 8;
2445                         ccw->cda = (__u32)(addr_t) ect;
2446                 } else {                /* write remaining records */
2447                         for (i = 0; i < rpt; i++) {
2448                                 ect = (struct eckd_count *) data;
2449                                 data += sizeof(struct eckd_count);
2450                                 ect->cyl = address.cyl;
2451                                 ect->head = address.head;
2452                                 ect->record = i + 1;
2453                                 ect->kl = 0;
2454                                 ect->dl = fdata->blksize;
2455                                 /*
2456                                  * Check for special tracks 0-1
2457                                  * when formatting CDL
2458                                  */
2459                                 if ((intensity & 0x08) &&
2460                                     address.cyl == 0 && address.head == 0) {
2461                                         if (i < 3) {
2462                                                 ect->kl = 4;
2463                                                 ect->dl = sizes_trk0[i] - 4;
2464                                         }
2465                                 }
2466                                 if ((intensity & 0x08) &&
2467                                     address.cyl == 0 && address.head == 1) {
2468                                         ect->kl = 44;
2469                                         ect->dl = LABEL_SIZE - 44;
2470                                 }
2471                                 ccw[-1].flags |= CCW_FLAG_CC;
2472                                 if (i != 0 || j == 0)
2473                                         ccw->cmd_code =
2474                                                 DASD_ECKD_CCW_WRITE_CKD;
2475                                 else
2476                                         ccw->cmd_code =
2477                                                 DASD_ECKD_CCW_WRITE_CKD_MT;
2478                                 ccw->flags = CCW_FLAG_SLI;
2479                                 ccw->count = 8;
2480                                 ccw->cda = (__u32)(addr_t) ect;
2481                                 ccw++;
2482                         }
2483                 }
2484         }
2485
2486         fcp->startdev = startdev;
2487         fcp->memdev = startdev;
2488         fcp->basedev = base;
2489         fcp->retries = 256;
2490         fcp->expires = startdev->default_expires * HZ;
2491         fcp->buildclk = get_tod_clock();
2492         fcp->status = DASD_CQR_FILLED;
2493
2494         return fcp;
2495 }
2496
2497 /*
2498  * Wrapper function to build a CCW request depending on input data
2499  */
2500 static struct dasd_ccw_req *
2501 dasd_eckd_format_build_ccw_req(struct dasd_device *base,
2502                                struct format_data_t *fdata, int enable_pav,
2503                                int tpm, struct eckd_count *fmt_buffer, int rpt)
2504 {
2505         struct dasd_ccw_req *ccw_req;
2506
2507         if (!fmt_buffer) {
2508                 ccw_req = dasd_eckd_build_format(base, fdata, enable_pav);
2509         } else {
2510                 if (tpm)
2511                         ccw_req = dasd_eckd_build_check_tcw(base, fdata,
2512                                                             enable_pav,
2513                                                             fmt_buffer, rpt);
2514                 else
2515                         ccw_req = dasd_eckd_build_check(base, fdata, enable_pav,
2516                                                         fmt_buffer, rpt);
2517         }
2518
2519         return ccw_req;
2520 }
2521
2522 /*
2523  * Sanity checks on format_data
2524  */
2525 static int dasd_eckd_format_sanity_checks(struct dasd_device *base,
2526                                           struct format_data_t *fdata)
2527 {
2528         struct dasd_eckd_private *private = base->private;
2529
2530         if (fdata->start_unit >=
2531             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2532                 dev_warn(&base->cdev->dev,
2533                          "Start track number %u used in formatting is too big\n",
2534                          fdata->start_unit);
2535                 return -EINVAL;
2536         }
2537         if (fdata->stop_unit >=
2538             (private->real_cyl * private->rdc_data.trk_per_cyl)) {
2539                 dev_warn(&base->cdev->dev,
2540                          "Stop track number %u used in formatting is too big\n",
2541                          fdata->stop_unit);
2542                 return -EINVAL;
2543         }
2544         if (fdata->start_unit > fdata->stop_unit) {
2545                 dev_warn(&base->cdev->dev,
2546                          "Start track %u used in formatting exceeds end track\n",
2547                          fdata->start_unit);
2548                 return -EINVAL;
2549         }
2550         if (dasd_check_blocksize(fdata->blksize) != 0) {
2551                 dev_warn(&base->cdev->dev,
2552                          "The DASD cannot be formatted with block size %u\n",
2553                          fdata->blksize);
2554                 return -EINVAL;
2555         }
2556         return 0;
2557 }
2558
2559 /*
2560  * This function will process format_data originally coming from an IOCTL
2561  */
2562 static int dasd_eckd_format_process_data(struct dasd_device *base,
2563                                          struct format_data_t *fdata,
2564                                          int enable_pav, int tpm,
2565                                          struct eckd_count *fmt_buffer, int rpt,
2566                                          struct irb *irb)
2567 {
2568         struct dasd_eckd_private *private = base->private;
2569         struct dasd_ccw_req *cqr, *n;
2570         struct list_head format_queue;
2571         struct dasd_device *device;
2572         char *sense = NULL;
2573         int old_start, old_stop, format_step;
2574         int step, retry;
2575         int rc;
2576
2577         rc = dasd_eckd_format_sanity_checks(base, fdata);
2578         if (rc)
2579                 return rc;
2580
2581         INIT_LIST_HEAD(&format_queue);
2582
2583         old_start = fdata->start_unit;
2584         old_stop = fdata->stop_unit;
2585
2586         if (!tpm && fmt_buffer != NULL) {
2587                 /* Command Mode / Format Check */
2588                 format_step = 1;
2589         } else if (tpm && fmt_buffer != NULL) {
2590                 /* Transport Mode / Format Check */
2591                 format_step = DASD_CQR_MAX_CCW / rpt;
2592         } else {
2593                 /* Normal Formatting */
2594                 format_step = DASD_CQR_MAX_CCW /
2595                         recs_per_track(&private->rdc_data, 0, fdata->blksize);
2596         }
2597
2598         do {
2599                 retry = 0;
2600                 while (fdata->start_unit <= old_stop) {
2601                         step = fdata->stop_unit - fdata->start_unit + 1;
2602                         if (step > format_step) {
2603                                 fdata->stop_unit =
2604                                         fdata->start_unit + format_step - 1;
2605                         }
2606
2607                         cqr = dasd_eckd_format_build_ccw_req(base, fdata,
2608                                                              enable_pav, tpm,
2609                                                              fmt_buffer, rpt);
2610                         if (IS_ERR(cqr)) {
2611                                 rc = PTR_ERR(cqr);
2612                                 if (rc == -ENOMEM) {
2613                                         if (list_empty(&format_queue))
2614                                                 goto out;
2615                                         /*
2616                                          * not enough memory available, start
2617                                          * requests retry after first requests
2618                                          * were finished
2619                                          */
2620                                         retry = 1;
2621                                         break;
2622                                 }
2623                                 goto out_err;
2624                         }
2625                         list_add_tail(&cqr->blocklist, &format_queue);
2626
2627                         if (fmt_buffer) {
2628                                 step = fdata->stop_unit - fdata->start_unit + 1;
2629                                 fmt_buffer += rpt * step;
2630                         }
2631                         fdata->start_unit = fdata->stop_unit + 1;
2632                         fdata->stop_unit = old_stop;
2633                 }
2634
2635                 rc = dasd_sleep_on_queue(&format_queue);
2636
2637 out_err:
2638                 list_for_each_entry_safe(cqr, n, &format_queue, blocklist) {
2639                         device = cqr->startdev;
2640                         private = device->private;
2641
2642                         if (cqr->status == DASD_CQR_FAILED) {
2643                                 /*
2644                                  * Only get sense data if called by format
2645                                  * check
2646                                  */
2647                                 if (fmt_buffer && irb) {
2648                                         sense = dasd_get_sense(&cqr->irb);
2649                                         memcpy(irb, &cqr->irb, sizeof(*irb));
2650                                 }
2651                                 rc = -EIO;
2652                         }
2653                         list_del_init(&cqr->blocklist);
2654                         dasd_sfree_request(cqr, device);
2655                         private->count--;
2656                 }
2657
2658                 if (rc && rc != -EIO)
2659                         goto out;
2660                 if (rc == -EIO) {
2661                         /*
2662                          * In case fewer than the expected records are on the
2663                          * track, we will most likely get a 'No Record Found'
2664                          * error (in command mode) or a 'File Protected' error
2665                          * (in transport mode). Those particular cases shouldn't
2666                          * pass the -EIO to the IOCTL, therefore reset the rc
2667                          * and continue.
2668                          */
2669                         if (sense &&
2670                             (sense[1] & SNS1_NO_REC_FOUND ||
2671                              sense[1] & SNS1_FILE_PROTECTED))
2672                                 retry = 1;
2673                         else
2674                                 goto out;
2675                 }
2676
2677         } while (retry);
2678
2679 out:
2680         fdata->start_unit = old_start;
2681         fdata->stop_unit = old_stop;
2682
2683         return rc;
2684 }
2685
2686 static int dasd_eckd_format_device(struct dasd_device *base,
2687                                    struct format_data_t *fdata, int enable_pav)
2688 {
2689         return dasd_eckd_format_process_data(base, fdata, enable_pav, 0, NULL,
2690                                              0, NULL);
2691 }
2692
2693 /*
2694  * Helper function to count consecutive records of a single track.
2695  */
2696 static int dasd_eckd_count_records(struct eckd_count *fmt_buffer, int start,
2697                                    int max)
2698 {
2699         int head;
2700         int i;
2701
2702         head = fmt_buffer[start].head;
2703
2704         /*
2705          * There are 3 conditions where we stop counting:
2706          * - if data reoccurs (same head and record may reoccur), which may
2707          *   happen due to the way DASD_ECKD_CCW_READ_COUNT works
2708          * - when the head changes, because we're iterating over several tracks
2709          *   then (DASD_ECKD_CCW_READ_COUNT_MT)
2710          * - when we've reached the end of sensible data in the buffer (the
2711          *   record will be 0 then)
2712          */
2713         for (i = start; i < max; i++) {
2714                 if (i > start) {
2715                         if ((fmt_buffer[i].head == head &&
2716                             fmt_buffer[i].record == 1) ||
2717                             fmt_buffer[i].head != head ||
2718                             fmt_buffer[i].record == 0)
2719                                 break;
2720                 }
2721         }
2722
2723         return i - start;
2724 }
2725
2726 /*
2727  * Evaluate a given range of tracks. Data like number of records, blocksize,
2728  * record ids, and key length are compared with expected data.
2729  *
2730  * If a mismatch occurs, the corresponding error bit is set, as well as
2731  * additional information, depending on the error.
2732  */
2733 static void dasd_eckd_format_evaluate_tracks(struct eckd_count *fmt_buffer,
2734                                              struct format_check_t *cdata,
2735                                              int rpt_max, int rpt_exp,
2736                                              int trk_per_cyl, int tpm)
2737 {
2738         struct ch_t geo;
2739         int max_entries;
2740         int count = 0;
2741         int trkcount;
2742         int blksize;
2743         int pos = 0;
2744         int i, j;
2745         int kl;
2746
2747         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2748         max_entries = trkcount * rpt_max;
2749
2750         for (i = cdata->expect.start_unit; i <= cdata->expect.stop_unit; i++) {
2751                 /* Calculate the correct next starting position in the buffer */
2752                 if (tpm) {
2753                         while (fmt_buffer[pos].record == 0 &&
2754                                fmt_buffer[pos].dl == 0) {
2755                                 if (pos++ > max_entries)
2756                                         break;
2757                         }
2758                 } else {
2759                         if (i != cdata->expect.start_unit)
2760                                 pos += rpt_max - count;
2761                 }
2762
2763                 /* Calculate the expected geo values for the current track */
2764                 set_ch_t(&geo, i / trk_per_cyl, i % trk_per_cyl);
2765
2766                 /* Count and check number of records */
2767                 count = dasd_eckd_count_records(fmt_buffer, pos, pos + rpt_max);
2768
2769                 if (count < rpt_exp) {
2770                         cdata->result = DASD_FMT_ERR_TOO_FEW_RECORDS;
2771                         break;
2772                 }
2773                 if (count > rpt_exp) {
2774                         cdata->result = DASD_FMT_ERR_TOO_MANY_RECORDS;
2775                         break;
2776                 }
2777
2778                 for (j = 0; j < count; j++, pos++) {
2779                         blksize = cdata->expect.blksize;
2780                         kl = 0;
2781
2782                         /*
2783                          * Set special values when checking CDL formatted
2784                          * devices.
2785                          */
2786                         if ((cdata->expect.intensity & 0x08) &&
2787                             geo.cyl == 0 && geo.head == 0) {
2788                                 if (j < 3) {
2789                                         blksize = sizes_trk0[j] - 4;
2790                                         kl = 4;
2791                                 }
2792                         }
2793                         if ((cdata->expect.intensity & 0x08) &&
2794                             geo.cyl == 0 && geo.head == 1) {
2795                                 blksize = LABEL_SIZE - 44;
2796                                 kl = 44;
2797                         }
2798
2799                         /* Check blocksize */
2800                         if (fmt_buffer[pos].dl != blksize) {
2801                                 cdata->result = DASD_FMT_ERR_BLKSIZE;
2802                                 goto out;
2803                         }
2804                         /* Check if key length is 0 */
2805                         if (fmt_buffer[pos].kl != kl) {
2806                                 cdata->result = DASD_FMT_ERR_KEY_LENGTH;
2807                                 goto out;
2808                         }
2809                         /* Check if record_id is correct */
2810                         if (fmt_buffer[pos].cyl != geo.cyl ||
2811                             fmt_buffer[pos].head != geo.head ||
2812                             fmt_buffer[pos].record != (j + 1)) {
2813                                 cdata->result = DASD_FMT_ERR_RECORD_ID;
2814                                 goto out;
2815                         }
2816                 }
2817         }
2818
2819 out:
2820         /*
2821          * In case of no errors, we need to decrease by one
2822          * to get the correct positions.
2823          */
2824         if (!cdata->result) {
2825                 i--;
2826                 pos--;
2827         }
2828
2829         cdata->unit = i;
2830         cdata->num_records = count;
2831         cdata->rec = fmt_buffer[pos].record;
2832         cdata->blksize = fmt_buffer[pos].dl;
2833         cdata->key_length = fmt_buffer[pos].kl;
2834 }
2835
2836 /*
2837  * Check the format of a range of tracks of a DASD.
2838  */
2839 static int dasd_eckd_check_device_format(struct dasd_device *base,
2840                                          struct format_check_t *cdata,
2841                                          int enable_pav)
2842 {
2843         struct dasd_eckd_private *private = base->private;
2844         struct eckd_count *fmt_buffer;
2845         struct irb irb;
2846         int rpt_max, rpt_exp;
2847         int fmt_buffer_size;
2848         int trk_per_cyl;
2849         int trkcount;
2850         int tpm = 0;
2851         int rc;
2852
2853         trk_per_cyl = private->rdc_data.trk_per_cyl;
2854
2855         /* Get maximum and expected amount of records per track */
2856         rpt_max = recs_per_track(&private->rdc_data, 0, 512) + 1;
2857         rpt_exp = recs_per_track(&private->rdc_data, 0, cdata->expect.blksize);
2858
2859         trkcount = cdata->expect.stop_unit - cdata->expect.start_unit + 1;
2860         fmt_buffer_size = trkcount * rpt_max * sizeof(struct eckd_count);
2861
2862         fmt_buffer = kzalloc(fmt_buffer_size, GFP_KERNEL | GFP_DMA);
2863         if (!fmt_buffer)
2864                 return -ENOMEM;
2865
2866         /*
2867          * A certain FICON feature subset is needed to operate in transport
2868          * mode. Additionally, the support for transport mode is implicitly
2869          * checked by comparing the buffer size with fcx_max_data. As long as
2870          * the buffer size is smaller we can operate in transport mode and
2871          * process multiple tracks. If not, only one track at once is being
2872          * processed using command mode.
2873          */
2874         if ((private->features.feature[40] & 0x04) &&
2875             fmt_buffer_size <= private->fcx_max_data)
2876                 tpm = 1;
2877
2878         rc = dasd_eckd_format_process_data(base, &cdata->expect, enable_pav,
2879                                            tpm, fmt_buffer, rpt_max, &irb);
2880         if (rc && rc != -EIO)
2881                 goto out;
2882         if (rc == -EIO) {
2883                 /*
2884                  * If our first attempt with transport mode enabled comes back
2885                  * with an incorrect length error, we're going to retry the
2886                  * check with command mode.
2887                  */
2888                 if (tpm && scsw_cstat(&irb.scsw) == 0x40) {
2889                         tpm = 0;
2890                         rc = dasd_eckd_format_process_data(base, &cdata->expect,
2891                                                            enable_pav, tpm,
2892                                                            fmt_buffer, rpt_max,
2893                                                            &irb);
2894                         if (rc)
2895                                 goto out;
2896                 } else {
2897                         goto out;
2898                 }
2899         }
2900
2901         dasd_eckd_format_evaluate_tracks(fmt_buffer, cdata, rpt_max, rpt_exp,
2902                                          trk_per_cyl, tpm);
2903
2904 out:
2905         kfree(fmt_buffer);
2906
2907         return rc;
2908 }
2909
2910 static void dasd_eckd_handle_terminated_request(struct dasd_ccw_req *cqr)
2911 {
2912         if (cqr->retries < 0) {
2913                 cqr->status = DASD_CQR_FAILED;
2914                 return;
2915         }
2916         cqr->status = DASD_CQR_FILLED;
2917         if (cqr->block && (cqr->startdev != cqr->block->base)) {
2918                 dasd_eckd_reset_ccw_to_base_io(cqr);
2919                 cqr->startdev = cqr->block->base;
2920                 cqr->lpm = dasd_path_get_opm(cqr->block->base);
2921         }
2922 };
2923
2924 static dasd_erp_fn_t
2925 dasd_eckd_erp_action(struct dasd_ccw_req * cqr)
2926 {
2927         struct dasd_device *device = (struct dasd_device *) cqr->startdev;
2928         struct ccw_device *cdev = device->cdev;
2929
2930         switch (cdev->id.cu_type) {
2931         case 0x3990:
2932         case 0x2105:
2933         case 0x2107:
2934         case 0x1750:
2935                 return dasd_3990_erp_action;
2936         case 0x9343:
2937         case 0x3880:
2938         default:
2939                 return dasd_default_erp_action;
2940         }
2941 }
2942
2943 static dasd_erp_fn_t
2944 dasd_eckd_erp_postaction(struct dasd_ccw_req * cqr)
2945 {
2946         return dasd_default_erp_postaction;
2947 }
2948
2949 static void dasd_eckd_check_for_device_change(struct dasd_device *device,
2950                                               struct dasd_ccw_req *cqr,
2951                                               struct irb *irb)
2952 {
2953         char mask;
2954         char *sense = NULL;
2955         struct dasd_eckd_private *private = device->private;
2956
2957         /* first of all check for state change pending interrupt */
2958         mask = DEV_STAT_ATTENTION | DEV_STAT_DEV_END | DEV_STAT_UNIT_EXCEP;
2959         if ((scsw_dstat(&irb->scsw) & mask) == mask) {
2960                 /*
2961                  * for alias only, not in offline processing
2962                  * and only if not suspended
2963                  */
2964                 if (!device->block && private->lcu &&
2965                     device->state == DASD_STATE_ONLINE &&
2966                     !test_bit(DASD_FLAG_OFFLINE, &device->flags) &&
2967                     !test_bit(DASD_FLAG_SUSPENDED, &device->flags)) {
2968                         /* schedule worker to reload device */
2969                         dasd_reload_device(device);
2970                 }
2971                 dasd_generic_handle_state_change(device);
2972                 return;
2973         }
2974
2975         sense = dasd_get_sense(irb);
2976         if (!sense)
2977                 return;
2978
2979         /* summary unit check */
2980         if ((sense[27] & DASD_SENSE_BIT_0) && (sense[7] == 0x0D) &&
2981             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK)) {
2982                 if (test_and_set_bit(DASD_FLAG_SUC, &device->flags)) {
2983                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2984                                       "eckd suc: device already notified");
2985                         return;
2986                 }
2987                 sense = dasd_get_sense(irb);
2988                 if (!sense) {
2989                         DBF_DEV_EVENT(DBF_WARNING, device, "%s",
2990                                       "eckd suc: no reason code available");
2991                         clear_bit(DASD_FLAG_SUC, &device->flags);
2992                         return;
2993
2994                 }
2995                 private->suc_reason = sense[8];
2996                 DBF_DEV_EVENT(DBF_NOTICE, device, "%s %x",
2997                               "eckd handle summary unit check: reason",
2998                               private->suc_reason);
2999                 dasd_get_device(device);
3000                 if (!schedule_work(&device->suc_work))
3001                         dasd_put_device(device);
3002
3003                 return;
3004         }
3005
3006         /* service information message SIM */
3007         if (!cqr && !(sense[27] & DASD_SENSE_BIT_0) &&
3008             ((sense[6] & DASD_SIM_SENSE) == DASD_SIM_SENSE)) {
3009                 dasd_3990_erp_handle_sim(device, sense);
3010                 return;
3011         }
3012
3013         /* loss of device reservation is handled via base devices only
3014          * as alias devices may be used with several bases
3015          */
3016         if (device->block && (sense[27] & DASD_SENSE_BIT_0) &&
3017             (sense[7] == 0x3F) &&
3018             (scsw_dstat(&irb->scsw) & DEV_STAT_UNIT_CHECK) &&
3019             test_bit(DASD_FLAG_IS_RESERVED, &device->flags)) {
3020                 if (device->features & DASD_FEATURE_FAILONSLCK)
3021                         set_bit(DASD_FLAG_LOCK_STOLEN, &device->flags);
3022                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
3023                 dev_err(&device->cdev->dev,
3024                         "The device reservation was lost\n");
3025         }
3026 }
3027
3028 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
3029                                                struct dasd_device *startdev,
3030                                                struct dasd_block *block,
3031                                                struct request *req,
3032                                                sector_t first_rec,
3033                                                sector_t last_rec,
3034                                                sector_t first_trk,
3035                                                sector_t last_trk,
3036                                                unsigned int first_offs,
3037                                                unsigned int last_offs,
3038                                                unsigned int blk_per_trk,
3039                                                unsigned int blksize)
3040 {
3041         struct dasd_eckd_private *private;
3042         unsigned long *idaws;
3043         struct LO_eckd_data *LO_data;
3044         struct dasd_ccw_req *cqr;
3045         struct ccw1 *ccw;
3046         struct req_iterator iter;
3047         struct bio_vec bv;
3048         char *dst;
3049         unsigned int off;
3050         int count, cidaw, cplength, datasize;
3051         sector_t recid;
3052         unsigned char cmd, rcmd;
3053         int use_prefix;
3054         struct dasd_device *basedev;
3055
3056         basedev = block->base;
3057         private = basedev->private;
3058         if (rq_data_dir(req) == READ)
3059                 cmd = DASD_ECKD_CCW_READ_MT;
3060         else if (rq_data_dir(req) == WRITE)
3061                 cmd = DASD_ECKD_CCW_WRITE_MT;
3062         else
3063                 return ERR_PTR(-EINVAL);
3064
3065         /* Check struct bio and count the number of blocks for the request. */
3066         count = 0;
3067         cidaw = 0;
3068         rq_for_each_segment(bv, req, iter) {
3069                 if (bv.bv_len & (blksize - 1))
3070                         /* Eckd can only do full blocks. */
3071                         return ERR_PTR(-EINVAL);
3072                 count += bv.bv_len >> (block->s2b_shift + 9);
3073                 if (idal_is_needed (page_address(bv.bv_page), bv.bv_len))
3074                         cidaw += bv.bv_len >> (block->s2b_shift + 9);
3075         }
3076         /* Paranoia. */
3077         if (count != last_rec - first_rec + 1)
3078                 return ERR_PTR(-EINVAL);
3079
3080         /* use the prefix command if available */
3081         use_prefix = private->features.feature[8] & 0x01;
3082         if (use_prefix) {
3083                 /* 1x prefix + number of blocks */
3084                 cplength = 2 + count;
3085                 /* 1x prefix + cidaws*sizeof(long) */
3086                 datasize = sizeof(struct PFX_eckd_data) +
3087                         sizeof(struct LO_eckd_data) +
3088                         cidaw * sizeof(unsigned long);
3089         } else {
3090                 /* 1x define extent + 1x locate record + number of blocks */
3091                 cplength = 2 + count;
3092                 /* 1x define extent + 1x locate record + cidaws*sizeof(long) */
3093                 datasize = sizeof(struct DE_eckd_data) +
3094                         sizeof(struct LO_eckd_data) +
3095                         cidaw * sizeof(unsigned long);
3096         }
3097         /* Find out the number of additional locate record ccws for cdl. */
3098         if (private->uses_cdl && first_rec < 2*blk_per_trk) {
3099                 if (last_rec >= 2*blk_per_trk)
3100                         count = 2*blk_per_trk - first_rec;
3101                 cplength += count;
3102                 datasize += count*sizeof(struct LO_eckd_data);
3103         }
3104         /* Allocate the ccw request. */
3105         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3106                                    startdev);
3107         if (IS_ERR(cqr))
3108                 return cqr;
3109         ccw = cqr->cpaddr;
3110         /* First ccw is define extent or prefix. */
3111         if (use_prefix) {
3112                 if (prefix(ccw++, cqr->data, first_trk,
3113                            last_trk, cmd, basedev, startdev) == -EAGAIN) {
3114                         /* Clock not in sync and XRC is enabled.
3115                          * Try again later.
3116                          */
3117                         dasd_sfree_request(cqr, startdev);
3118                         return ERR_PTR(-EAGAIN);
3119                 }
3120                 idaws = (unsigned long *) (cqr->data +
3121                                            sizeof(struct PFX_eckd_data));
3122         } else {
3123                 if (define_extent(ccw++, cqr->data, first_trk,
3124                                   last_trk, cmd, basedev, 0) == -EAGAIN) {
3125                         /* Clock not in sync and XRC is enabled.
3126                          * Try again later.
3127                          */
3128                         dasd_sfree_request(cqr, startdev);
3129                         return ERR_PTR(-EAGAIN);
3130                 }
3131                 idaws = (unsigned long *) (cqr->data +
3132                                            sizeof(struct DE_eckd_data));
3133         }
3134         /* Build locate_record+read/write/ccws. */
3135         LO_data = (struct LO_eckd_data *) (idaws + cidaw);
3136         recid = first_rec;
3137         if (private->uses_cdl == 0 || recid > 2*blk_per_trk) {
3138                 /* Only standard blocks so there is just one locate record. */
3139                 ccw[-1].flags |= CCW_FLAG_CC;
3140                 locate_record(ccw++, LO_data++, first_trk, first_offs + 1,
3141                               last_rec - recid + 1, cmd, basedev, blksize);
3142         }
3143         rq_for_each_segment(bv, req, iter) {
3144                 dst = page_address(bv.bv_page) + bv.bv_offset;
3145                 if (dasd_page_cache) {
3146                         char *copy = kmem_cache_alloc(dasd_page_cache,
3147                                                       GFP_DMA | __GFP_NOWARN);
3148                         if (copy && rq_data_dir(req) == WRITE)
3149                                 memcpy(copy + bv.bv_offset, dst, bv.bv_len);
3150                         if (copy)
3151                                 dst = copy + bv.bv_offset;
3152                 }
3153                 for (off = 0; off < bv.bv_len; off += blksize) {
3154                         sector_t trkid = recid;
3155                         unsigned int recoffs = sector_div(trkid, blk_per_trk);
3156                         rcmd = cmd;
3157                         count = blksize;
3158                         /* Locate record for cdl special block ? */
3159                         if (private->uses_cdl && recid < 2*blk_per_trk) {
3160                                 if (dasd_eckd_cdl_special(blk_per_trk, recid)){
3161                                         rcmd |= 0x8;
3162                                         count = dasd_eckd_cdl_reclen(recid);
3163                                         if (count < blksize &&
3164                                             rq_data_dir(req) == READ)
3165                                                 memset(dst + count, 0xe5,
3166                                                        blksize - count);
3167                                 }
3168                                 ccw[-1].flags |= CCW_FLAG_CC;
3169                                 locate_record(ccw++, LO_data++,
3170                                               trkid, recoffs + 1,
3171                                               1, rcmd, basedev, count);
3172                         }
3173                         /* Locate record for standard blocks ? */
3174                         if (private->uses_cdl && recid == 2*blk_per_trk) {
3175                                 ccw[-1].flags |= CCW_FLAG_CC;
3176                                 locate_record(ccw++, LO_data++,
3177                                               trkid, recoffs + 1,
3178                                               last_rec - recid + 1,
3179                                               cmd, basedev, count);
3180                         }
3181                         /* Read/write ccw. */
3182                         ccw[-1].flags |= CCW_FLAG_CC;
3183                         ccw->cmd_code = rcmd;
3184                         ccw->count = count;
3185                         if (idal_is_needed(dst, blksize)) {
3186                                 ccw->cda = (__u32)(addr_t) idaws;
3187                                 ccw->flags = CCW_FLAG_IDA;
3188                                 idaws = idal_create_words(idaws, dst, blksize);
3189                         } else {
3190                                 ccw->cda = (__u32)(addr_t) dst;
3191                                 ccw->flags = 0;
3192                         }
3193                         ccw++;
3194                         dst += blksize;
3195                         recid++;
3196                 }
3197         }
3198         if (blk_noretry_request(req) ||
3199             block->base->features & DASD_FEATURE_FAILFAST)
3200                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3201         cqr->startdev = startdev;
3202         cqr->memdev = startdev;
3203         cqr->block = block;
3204         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3205         cqr->lpm = dasd_path_get_ppm(startdev);
3206         cqr->retries = startdev->default_retries;
3207         cqr->buildclk = get_tod_clock();
3208         cqr->status = DASD_CQR_FILLED;
3209         return cqr;
3210 }
3211
3212 static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
3213                                                struct dasd_device *startdev,
3214                                                struct dasd_block *block,
3215                                                struct request *req,
3216                                                sector_t first_rec,
3217                                                sector_t last_rec,
3218                                                sector_t first_trk,
3219                                                sector_t last_trk,
3220                                                unsigned int first_offs,
3221                                                unsigned int last_offs,
3222                                                unsigned int blk_per_trk,
3223                                                unsigned int blksize)
3224 {
3225         unsigned long *idaws;
3226         struct dasd_ccw_req *cqr;
3227         struct ccw1 *ccw;
3228         struct req_iterator iter;
3229         struct bio_vec bv;
3230         char *dst, *idaw_dst;
3231         unsigned int cidaw, cplength, datasize;
3232         unsigned int tlf;
3233         sector_t recid;
3234         unsigned char cmd;
3235         struct dasd_device *basedev;
3236         unsigned int trkcount, count, count_to_trk_end;
3237         unsigned int idaw_len, seg_len, part_len, len_to_track_end;
3238         unsigned char new_track, end_idaw;
3239         sector_t trkid;
3240         unsigned int recoffs;
3241
3242         basedev = block->base;
3243         if (rq_data_dir(req) == READ)
3244                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3245         else if (rq_data_dir(req) == WRITE)
3246                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3247         else
3248                 return ERR_PTR(-EINVAL);
3249
3250         /* Track based I/O needs IDAWs for each page, and not just for
3251          * 64 bit addresses. We need additional idals for pages
3252          * that get filled from two tracks, so we use the number
3253          * of records as upper limit.
3254          */
3255         cidaw = last_rec - first_rec + 1;
3256         trkcount = last_trk - first_trk + 1;
3257
3258         /* 1x prefix + one read/write ccw per track */
3259         cplength = 1 + trkcount;
3260
3261         datasize = sizeof(struct PFX_eckd_data) + cidaw * sizeof(unsigned long);
3262
3263         /* Allocate the ccw request. */
3264         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
3265                                    startdev);
3266         if (IS_ERR(cqr))
3267                 return cqr;
3268         ccw = cqr->cpaddr;
3269         /* transfer length factor: how many bytes to read from the last track */
3270         if (first_trk == last_trk)
3271                 tlf = last_offs - first_offs + 1;
3272         else
3273                 tlf = last_offs + 1;
3274         tlf *= blksize;
3275
3276         if (prefix_LRE(ccw++, cqr->data, first_trk,
3277                        last_trk, cmd, basedev, startdev,
3278                        1 /* format */, first_offs + 1,
3279                        trkcount, blksize,
3280                        tlf) == -EAGAIN) {
3281                 /* Clock not in sync and XRC is enabled.
3282                  * Try again later.
3283                  */
3284                 dasd_sfree_request(cqr, startdev);
3285                 return ERR_PTR(-EAGAIN);
3286         }
3287
3288         /*
3289          * The translation of request into ccw programs must meet the
3290          * following conditions:
3291          * - all idaws but the first and the last must address full pages
3292          *   (or 2K blocks on 31-bit)
3293          * - the scope of a ccw and it's idal ends with the track boundaries
3294          */
3295         idaws = (unsigned long *) (cqr->data + sizeof(struct PFX_eckd_data));
3296         recid = first_rec;
3297         new_track = 1;
3298         end_idaw = 0;
3299         len_to_track_end = 0;
3300         idaw_dst = NULL;
3301         idaw_len = 0;
3302         rq_for_each_segment(bv, req, iter) {
3303                 dst = page_address(bv.bv_page) + bv.bv_offset;
3304                 seg_len = bv.bv_len;
3305                 while (seg_len) {
3306                         if (new_track) {
3307                                 trkid = recid;
3308                                 recoffs = sector_div(trkid, blk_per_trk);
3309                                 count_to_trk_end = blk_per_trk - recoffs;
3310                                 count = min((last_rec - recid + 1),
3311                                             (sector_t)count_to_trk_end);
3312                                 len_to_track_end = count * blksize;
3313                                 ccw[-1].flags |= CCW_FLAG_CC;
3314                                 ccw->cmd_code = cmd;
3315                                 ccw->count = len_to_track_end;
3316                                 ccw->cda = (__u32)(addr_t)idaws;
3317                                 ccw->flags = CCW_FLAG_IDA;
3318                                 ccw++;
3319                                 recid += count;
3320                                 new_track = 0;
3321                                 /* first idaw for a ccw may start anywhere */
3322                                 if (!idaw_dst)
3323                                         idaw_dst = dst;
3324                         }
3325                         /* If we start a new idaw, we must make sure that it
3326                          * starts on an IDA_BLOCK_SIZE boundary.
3327                          * If we continue an idaw, we must make sure that the
3328                          * current segment begins where the so far accumulated
3329                          * idaw ends
3330                          */
3331                         if (!idaw_dst) {
3332                                 if (__pa(dst) & (IDA_BLOCK_SIZE-1)) {
3333                                         dasd_sfree_request(cqr, startdev);
3334                                         return ERR_PTR(-ERANGE);
3335                                 } else
3336                                         idaw_dst = dst;
3337                         }
3338                         if ((idaw_dst + idaw_len) != dst) {
3339                                 dasd_sfree_request(cqr, startdev);
3340                                 return ERR_PTR(-ERANGE);
3341                         }
3342                         part_len = min(seg_len, len_to_track_end);
3343                         seg_len -= part_len;
3344                         dst += part_len;
3345                         idaw_len += part_len;
3346                         len_to_track_end -= part_len;
3347                         /* collected memory area ends on an IDA_BLOCK border,
3348                          * -> create an idaw
3349                          * idal_create_words will handle cases where idaw_len
3350                          * is larger then IDA_BLOCK_SIZE
3351                          */
3352                         if (!(__pa(idaw_dst + idaw_len) & (IDA_BLOCK_SIZE-1)))
3353                                 end_idaw = 1;
3354                         /* We also need to end the idaw at track end */
3355                         if (!len_to_track_end) {
3356                                 new_track = 1;
3357                                 end_idaw = 1;
3358                         }
3359                         if (end_idaw) {
3360                                 idaws = idal_create_words(idaws, idaw_dst,
3361                                                           idaw_len);
3362                                 idaw_dst = NULL;
3363                                 idaw_len = 0;
3364                                 end_idaw = 0;
3365                         }
3366                 }
3367         }
3368
3369         if (blk_noretry_request(req) ||
3370             block->base->features & DASD_FEATURE_FAILFAST)
3371                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3372         cqr->startdev = startdev;
3373         cqr->memdev = startdev;
3374         cqr->block = block;
3375         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3376         cqr->lpm = dasd_path_get_ppm(startdev);
3377         cqr->retries = startdev->default_retries;
3378         cqr->buildclk = get_tod_clock();
3379         cqr->status = DASD_CQR_FILLED;
3380         return cqr;
3381 }
3382
3383 static int prepare_itcw(struct itcw *itcw,
3384                         unsigned int trk, unsigned int totrk, int cmd,
3385                         struct dasd_device *basedev,
3386                         struct dasd_device *startdev,
3387                         unsigned int rec_on_trk, int count,
3388                         unsigned int blksize,
3389                         unsigned int total_data_size,
3390                         unsigned int tlf,
3391                         unsigned int blk_per_trk)
3392 {
3393         struct PFX_eckd_data pfxdata;
3394         struct dasd_eckd_private *basepriv, *startpriv;
3395         struct DE_eckd_data *dedata;
3396         struct LRE_eckd_data *lredata;
3397         struct dcw *dcw;
3398
3399         u32 begcyl, endcyl;
3400         u16 heads, beghead, endhead;
3401         u8 pfx_cmd;
3402
3403         int rc = 0;
3404         int sector = 0;
3405         int dn, d;
3406
3407
3408         /* setup prefix data */
3409         basepriv = basedev->private;
3410         startpriv = startdev->private;
3411         dedata = &pfxdata.define_extent;
3412         lredata = &pfxdata.locate_record;
3413
3414         memset(&pfxdata, 0, sizeof(pfxdata));
3415         pfxdata.format = 1; /* PFX with LRE */
3416         pfxdata.base_address = basepriv->ned->unit_addr;
3417         pfxdata.base_lss = basepriv->ned->ID;
3418         pfxdata.validity.define_extent = 1;
3419
3420         /* private uid is kept up to date, conf_data may be outdated */
3421         if (startpriv->uid.type == UA_BASE_PAV_ALIAS)
3422                 pfxdata.validity.verify_base = 1;
3423
3424         if (startpriv->uid.type == UA_HYPER_PAV_ALIAS) {
3425                 pfxdata.validity.verify_base = 1;
3426                 pfxdata.validity.hyper_pav = 1;
3427         }
3428
3429         switch (cmd) {
3430         case DASD_ECKD_CCW_READ_TRACK_DATA:
3431                 dedata->mask.perm = 0x1;
3432                 dedata->attributes.operation = basepriv->attrib.operation;
3433                 dedata->blk_size = blksize;
3434                 dedata->ga_extended |= 0x42;
3435                 lredata->operation.orientation = 0x0;
3436                 lredata->operation.operation = 0x0C;
3437                 lredata->auxiliary.check_bytes = 0x01;
3438                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3439                 break;
3440         case DASD_ECKD_CCW_WRITE_TRACK_DATA:
3441                 dedata->mask.perm = 0x02;
3442                 dedata->attributes.operation = basepriv->attrib.operation;
3443                 dedata->blk_size = blksize;
3444                 rc = set_timestamp(NULL, dedata, basedev);
3445                 dedata->ga_extended |= 0x42;
3446                 lredata->operation.orientation = 0x0;
3447                 lredata->operation.operation = 0x3F;
3448                 lredata->extended_operation = 0x23;
3449                 lredata->auxiliary.check_bytes = 0x2;
3450                 /*
3451                  * If XRC is supported the System Time Stamp is set. The
3452                  * validity of the time stamp must be reflected in the prefix
3453                  * data as well.
3454                  */
3455                 if (dedata->ga_extended & 0x08 && dedata->ga_extended & 0x02)
3456                         pfxdata.validity.time_stamp = 1; /* 'Time Stamp Valid' */
3457                 pfx_cmd = DASD_ECKD_CCW_PFX;
3458                 break;
3459         case DASD_ECKD_CCW_READ_COUNT_MT:
3460                 dedata->mask.perm = 0x1;
3461                 dedata->attributes.operation = DASD_BYPASS_CACHE;
3462                 dedata->ga_extended |= 0x42;
3463                 dedata->blk_size = blksize;
3464                 lredata->operation.orientation = 0x2;
3465                 lredata->operation.operation = 0x16;
3466                 lredata->auxiliary.check_bytes = 0x01;
3467                 pfx_cmd = DASD_ECKD_CCW_PFX_READ;
3468                 break;
3469         default:
3470                 DBF_DEV_EVENT(DBF_ERR, basedev,
3471                               "prepare itcw, unknown opcode 0x%x", cmd);
3472                 BUG();
3473                 break;
3474         }
3475         if (rc)
3476                 return rc;
3477
3478         dedata->attributes.mode = 0x3;  /* ECKD */
3479
3480         heads = basepriv->rdc_data.trk_per_cyl;
3481         begcyl = trk / heads;
3482         beghead = trk % heads;
3483         endcyl = totrk / heads;
3484         endhead = totrk % heads;
3485
3486         /* check for sequential prestage - enhance cylinder range */
3487         if (dedata->attributes.operation == DASD_SEQ_PRESTAGE ||
3488             dedata->attributes.operation == DASD_SEQ_ACCESS) {
3489
3490                 if (endcyl + basepriv->attrib.nr_cyl < basepriv->real_cyl)
3491                         endcyl += basepriv->attrib.nr_cyl;
3492                 else
3493                         endcyl = (basepriv->real_cyl - 1);
3494         }
3495
3496         set_ch_t(&dedata->beg_ext, begcyl, beghead);
3497         set_ch_t(&dedata->end_ext, endcyl, endhead);
3498
3499         dedata->ep_format = 0x20; /* records per track is valid */
3500         dedata->ep_rec_per_track = blk_per_trk;
3501
3502         if (rec_on_trk) {
3503                 switch (basepriv->rdc_data.dev_type) {
3504                 case 0x3390:
3505                         dn = ceil_quot(blksize + 6, 232);
3506                         d = 9 + ceil_quot(blksize + 6 * (dn + 1), 34);
3507                         sector = (49 + (rec_on_trk - 1) * (10 + d)) / 8;
3508                         break;
3509                 case 0x3380:
3510                         d = 7 + ceil_quot(blksize + 12, 32);
3511                         sector = (39 + (rec_on_trk - 1) * (8 + d)) / 7;
3512                         break;
3513                 }
3514         }
3515
3516         if (cmd == DASD_ECKD_CCW_READ_COUNT_MT) {
3517                 lredata->auxiliary.length_valid = 0;
3518                 lredata->auxiliary.length_scope = 0;
3519                 lredata->sector = 0xff;
3520         } else {
3521                 lredata->auxiliary.length_valid = 1;
3522                 lredata->auxiliary.length_scope = 1;
3523                 lredata->sector = sector;
3524         }
3525         lredata->auxiliary.imbedded_ccw_valid = 1;
3526         lredata->length = tlf;
3527         lredata->imbedded_ccw = cmd;
3528         lredata->count = count;
3529         set_ch_t(&lredata->seek_addr, begcyl, beghead);
3530         lredata->search_arg.cyl = lredata->seek_addr.cyl;
3531         lredata->search_arg.head = lredata->seek_addr.head;
3532         lredata->search_arg.record = rec_on_trk;
3533
3534         dcw = itcw_add_dcw(itcw, pfx_cmd, 0,
3535                      &pfxdata, sizeof(pfxdata), total_data_size);
3536         return PTR_RET(dcw);
3537 }
3538
3539 static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
3540                                                struct dasd_device *startdev,
3541                                                struct dasd_block *block,
3542                                                struct request *req,
3543                                                sector_t first_rec,
3544                                                sector_t last_rec,
3545                                                sector_t first_trk,
3546                                                sector_t last_trk,
3547                                                unsigned int first_offs,
3548                                                unsigned int last_offs,
3549                                                unsigned int blk_per_trk,
3550                                                unsigned int blksize)
3551 {
3552         struct dasd_ccw_req *cqr;
3553         struct req_iterator iter;
3554         struct bio_vec bv;
3555         char *dst;
3556         unsigned int trkcount, ctidaw;
3557         unsigned char cmd;
3558         struct dasd_device *basedev;
3559         unsigned int tlf;
3560         struct itcw *itcw;
3561         struct tidaw *last_tidaw = NULL;
3562         int itcw_op;
3563         size_t itcw_size;
3564         u8 tidaw_flags;
3565         unsigned int seg_len, part_len, len_to_track_end;
3566         unsigned char new_track;
3567         sector_t recid, trkid;
3568         unsigned int offs;
3569         unsigned int count, count_to_trk_end;
3570         int ret;
3571
3572         basedev = block->base;
3573         if (rq_data_dir(req) == READ) {
3574                 cmd = DASD_ECKD_CCW_READ_TRACK_DATA;
3575                 itcw_op = ITCW_OP_READ;
3576         } else if (rq_data_dir(req) == WRITE) {
3577                 cmd = DASD_ECKD_CCW_WRITE_TRACK_DATA;
3578                 itcw_op = ITCW_OP_WRITE;
3579         } else
3580                 return ERR_PTR(-EINVAL);
3581
3582         /* trackbased I/O needs address all memory via TIDAWs,
3583          * not just for 64 bit addresses. This allows us to map
3584          * each segment directly to one tidaw.
3585          * In the case of write requests, additional tidaws may
3586          * be needed when a segment crosses a track boundary.
3587          */
3588         trkcount = last_trk - first_trk + 1;
3589         ctidaw = 0;
3590         rq_for_each_segment(bv, req, iter) {
3591                 ++ctidaw;
3592         }
3593         if (rq_data_dir(req) == WRITE)
3594                 ctidaw += (last_trk - first_trk);
3595
3596         /* Allocate the ccw request. */
3597         itcw_size = itcw_calc_size(0, ctidaw, 0);
3598         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
3599         if (IS_ERR(cqr))
3600                 return cqr;
3601
3602         /* transfer length factor: how many bytes to read from the last track */
3603         if (first_trk == last_trk)
3604                 tlf = last_offs - first_offs + 1;
3605         else
3606                 tlf = last_offs + 1;
3607         tlf *= blksize;
3608
3609         itcw = itcw_init(cqr->data, itcw_size, itcw_op, 0, ctidaw, 0);
3610         if (IS_ERR(itcw)) {
3611                 ret = -EINVAL;
3612                 goto out_error;
3613         }
3614         cqr->cpaddr = itcw_get_tcw(itcw);
3615         if (prepare_itcw(itcw, first_trk, last_trk,
3616                          cmd, basedev, startdev,
3617                          first_offs + 1,
3618                          trkcount, blksize,
3619                          (last_rec - first_rec + 1) * blksize,
3620                          tlf, blk_per_trk) == -EAGAIN) {
3621                 /* Clock not in sync and XRC is enabled.
3622                  * Try again later.
3623                  */
3624                 ret = -EAGAIN;
3625                 goto out_error;
3626         }
3627         len_to_track_end = 0;
3628         /*
3629          * A tidaw can address 4k of memory, but must not cross page boundaries
3630          * We can let the block layer handle this by setting
3631          * blk_queue_segment_boundary to page boundaries and
3632          * blk_max_segment_size to page size when setting up the request queue.
3633          * For write requests, a TIDAW must not cross track boundaries, because
3634          * we have to set the CBC flag on the last tidaw for each track.
3635          */
3636         if (rq_data_dir(req) == WRITE) {
3637                 new_track = 1;
3638                 recid = first_rec;
3639                 rq_for_each_segment(bv, req, iter) {
3640                         dst = page_address(bv.bv_page) + bv.bv_offset;
3641                         seg_len = bv.bv_len;
3642                         while (seg_len) {
3643                                 if (new_track) {
3644                                         trkid = recid;
3645                                         offs = sector_div(trkid, blk_per_trk);
3646                                         count_to_trk_end = blk_per_trk - offs;
3647                                         count = min((last_rec - recid + 1),
3648                                                     (sector_t)count_to_trk_end);
3649                                         len_to_track_end = count * blksize;
3650                                         recid += count;
3651                                         new_track = 0;
3652                                 }
3653                                 part_len = min(seg_len, len_to_track_end);
3654                                 seg_len -= part_len;
3655                                 len_to_track_end -= part_len;
3656                                 /* We need to end the tidaw at track end */
3657                                 if (!len_to_track_end) {
3658                                         new_track = 1;
3659                                         tidaw_flags = TIDAW_FLAGS_INSERT_CBC;
3660                                 } else
3661                                         tidaw_flags = 0;
3662                                 last_tidaw = itcw_add_tidaw(itcw, tidaw_flags,
3663                                                             dst, part_len);
3664                                 if (IS_ERR(last_tidaw)) {
3665                                         ret = -EINVAL;
3666                                         goto out_error;
3667                                 }
3668                                 dst += part_len;
3669                         }
3670                 }
3671         } else {
3672                 rq_for_each_segment(bv, req, iter) {
3673                         dst = page_address(bv.bv_page) + bv.bv_offset;
3674                         last_tidaw = itcw_add_tidaw(itcw, 0x00,
3675                                                     dst, bv.bv_len);
3676                         if (IS_ERR(last_tidaw)) {
3677                                 ret = -EINVAL;
3678                                 goto out_error;
3679                         }
3680                 }
3681         }
3682         last_tidaw->flags |= TIDAW_FLAGS_LAST;
3683         last_tidaw->flags &= ~TIDAW_FLAGS_INSERT_CBC;
3684         itcw_finalize(itcw);
3685
3686         if (blk_noretry_request(req) ||
3687             block->base->features & DASD_FEATURE_FAILFAST)
3688                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3689         cqr->cpmode = 1;
3690         cqr->startdev = startdev;
3691         cqr->memdev = startdev;
3692         cqr->block = block;
3693         cqr->expires = startdev->default_expires * HZ;  /* default 5 minutes */
3694         cqr->lpm = dasd_path_get_ppm(startdev);
3695         cqr->retries = startdev->default_retries;
3696         cqr->buildclk = get_tod_clock();
3697         cqr->status = DASD_CQR_FILLED;
3698         return cqr;
3699 out_error:
3700         dasd_sfree_request(cqr, startdev);
3701         return ERR_PTR(ret);
3702 }
3703
3704 static struct dasd_ccw_req *dasd_eckd_build_cp(struct dasd_device *startdev,
3705                                                struct dasd_block *block,
3706                                                struct request *req)
3707 {
3708         int cmdrtd, cmdwtd;
3709         int use_prefix;
3710         int fcx_multitrack;
3711         struct dasd_eckd_private *private;
3712         struct dasd_device *basedev;
3713         sector_t first_rec, last_rec;
3714         sector_t first_trk, last_trk;
3715         unsigned int first_offs, last_offs;
3716         unsigned int blk_per_trk, blksize;
3717         int cdlspecial;
3718         unsigned int data_size;
3719         struct dasd_ccw_req *cqr;
3720
3721         basedev = block->base;
3722         private = basedev->private;
3723
3724         /* Calculate number of blocks/records per track. */
3725         blksize = block->bp_block;
3726         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3727         if (blk_per_trk == 0)
3728                 return ERR_PTR(-EINVAL);
3729         /* Calculate record id of first and last block. */
3730         first_rec = first_trk = blk_rq_pos(req) >> block->s2b_shift;
3731         first_offs = sector_div(first_trk, blk_per_trk);
3732         last_rec = last_trk =
3733                 (blk_rq_pos(req) + blk_rq_sectors(req) - 1) >> block->s2b_shift;
3734         last_offs = sector_div(last_trk, blk_per_trk);
3735         cdlspecial = (private->uses_cdl && first_rec < 2*blk_per_trk);
3736
3737         fcx_multitrack = private->features.feature[40] & 0x20;
3738         data_size = blk_rq_bytes(req);
3739         if (data_size % blksize)
3740                 return ERR_PTR(-EINVAL);
3741         /* tpm write request add CBC data on each track boundary */
3742         if (rq_data_dir(req) == WRITE)
3743                 data_size += (last_trk - first_trk) * 4;
3744
3745         /* is read track data and write track data in command mode supported? */
3746         cmdrtd = private->features.feature[9] & 0x20;
3747         cmdwtd = private->features.feature[12] & 0x40;
3748         use_prefix = private->features.feature[8] & 0x01;
3749
3750         cqr = NULL;
3751         if (cdlspecial || dasd_page_cache) {
3752                 /* do nothing, just fall through to the cmd mode single case */
3753         } else if ((data_size <= private->fcx_max_data)
3754                    && (fcx_multitrack || (first_trk == last_trk))) {
3755                 cqr = dasd_eckd_build_cp_tpm_track(startdev, block, req,
3756                                                     first_rec, last_rec,
3757                                                     first_trk, last_trk,
3758                                                     first_offs, last_offs,
3759                                                     blk_per_trk, blksize);
3760                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3761                     (PTR_ERR(cqr) != -ENOMEM))
3762                         cqr = NULL;
3763         } else if (use_prefix &&
3764                    (((rq_data_dir(req) == READ) && cmdrtd) ||
3765                     ((rq_data_dir(req) == WRITE) && cmdwtd))) {
3766                 cqr = dasd_eckd_build_cp_cmd_track(startdev, block, req,
3767                                                    first_rec, last_rec,
3768                                                    first_trk, last_trk,
3769                                                    first_offs, last_offs,
3770                                                    blk_per_trk, blksize);
3771                 if (IS_ERR(cqr) && (PTR_ERR(cqr) != -EAGAIN) &&
3772                     (PTR_ERR(cqr) != -ENOMEM))
3773                         cqr = NULL;
3774         }
3775         if (!cqr)
3776                 cqr = dasd_eckd_build_cp_cmd_single(startdev, block, req,
3777                                                     first_rec, last_rec,
3778                                                     first_trk, last_trk,
3779                                                     first_offs, last_offs,
3780                                                     blk_per_trk, blksize);
3781         return cqr;
3782 }
3783
3784 static struct dasd_ccw_req *dasd_eckd_build_cp_raw(struct dasd_device *startdev,
3785                                                    struct dasd_block *block,
3786                                                    struct request *req)
3787 {
3788         sector_t start_padding_sectors, end_sector_offset, end_padding_sectors;
3789         unsigned int seg_len, len_to_track_end;
3790         unsigned int cidaw, cplength, datasize;
3791         sector_t first_trk, last_trk, sectors;
3792         struct dasd_eckd_private *base_priv;
3793         struct dasd_device *basedev;
3794         struct req_iterator iter;
3795         struct dasd_ccw_req *cqr;
3796         unsigned int first_offs;
3797         unsigned int trkcount;
3798         unsigned long *idaws;
3799         unsigned int size;
3800         unsigned char cmd;
3801         struct bio_vec bv;
3802         struct ccw1 *ccw;
3803         int use_prefix;
3804         void *data;
3805         char *dst;
3806
3807         /*
3808          * raw track access needs to be mutiple of 64k and on 64k boundary
3809          * For read requests we can fix an incorrect alignment by padding
3810          * the request with dummy pages.
3811          */
3812         start_padding_sectors = blk_rq_pos(req) % DASD_RAW_SECTORS_PER_TRACK;
3813         end_sector_offset = (blk_rq_pos(req) + blk_rq_sectors(req)) %
3814                 DASD_RAW_SECTORS_PER_TRACK;
3815         end_padding_sectors = (DASD_RAW_SECTORS_PER_TRACK - end_sector_offset) %
3816                 DASD_RAW_SECTORS_PER_TRACK;
3817         basedev = block->base;
3818         if ((start_padding_sectors || end_padding_sectors) &&
3819             (rq_data_dir(req) == WRITE)) {
3820                 DBF_DEV_EVENT(DBF_ERR, basedev,
3821                               "raw write not track aligned (%lu,%lu) req %p",
3822                               start_padding_sectors, end_padding_sectors, req);
3823                 return ERR_PTR(-EINVAL);
3824         }
3825
3826         first_trk = blk_rq_pos(req) / DASD_RAW_SECTORS_PER_TRACK;
3827         last_trk = (blk_rq_pos(req) + blk_rq_sectors(req) - 1) /
3828                 DASD_RAW_SECTORS_PER_TRACK;
3829         trkcount = last_trk - first_trk + 1;
3830         first_offs = 0;
3831
3832         if (rq_data_dir(req) == READ)
3833                 cmd = DASD_ECKD_CCW_READ_TRACK;
3834         else if (rq_data_dir(req) == WRITE)
3835                 cmd = DASD_ECKD_CCW_WRITE_FULL_TRACK;
3836         else
3837                 return ERR_PTR(-EINVAL);
3838
3839         /*
3840          * Raw track based I/O needs IDAWs for each page,
3841          * and not just for 64 bit addresses.
3842          */
3843         cidaw = trkcount * DASD_RAW_BLOCK_PER_TRACK;
3844
3845         /*
3846          * struct PFX_eckd_data and struct LRE_eckd_data can have up to 2 bytes
3847          * of extended parameter. This is needed for write full track.
3848          */
3849         base_priv = basedev->private;
3850         use_prefix = base_priv->features.feature[8] & 0x01;
3851         if (use_prefix) {
3852                 cplength = 1 + trkcount;
3853                 size = sizeof(struct PFX_eckd_data) + 2;
3854         } else {
3855                 cplength = 2 + trkcount;
3856                 size = sizeof(struct DE_eckd_data) +
3857                         sizeof(struct LRE_eckd_data) + 2;
3858         }
3859         size = ALIGN(size, 8);
3860
3861         datasize = size + cidaw * sizeof(unsigned long);
3862
3863         /* Allocate the ccw request. */
3864         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength,
3865                                    datasize, startdev);
3866         if (IS_ERR(cqr))
3867                 return cqr;
3868
3869         ccw = cqr->cpaddr;
3870         data = cqr->data;
3871
3872         if (use_prefix) {
3873                 prefix_LRE(ccw++, data, first_trk, last_trk, cmd, basedev,
3874                            startdev, 1, first_offs + 1, trkcount, 0, 0);
3875         } else {
3876                 define_extent(ccw++, data, first_trk, last_trk, cmd, basedev, 0);
3877                 ccw[-1].flags |= CCW_FLAG_CC;
3878
3879                 data += sizeof(struct DE_eckd_data);
3880                 locate_record_ext(ccw++, data, first_trk, first_offs + 1,
3881                                   trkcount, cmd, basedev, 0, 0);
3882         }
3883
3884         idaws = (unsigned long *)(cqr->data + size);
3885         len_to_track_end = 0;
3886         if (start_padding_sectors) {
3887                 ccw[-1].flags |= CCW_FLAG_CC;
3888                 ccw->cmd_code = cmd;
3889                 /* maximum 3390 track size */
3890                 ccw->count = 57326;
3891                 /* 64k map to one track */
3892                 len_to_track_end = 65536 - start_padding_sectors * 512;
3893                 ccw->cda = (__u32)(addr_t)idaws;
3894                 ccw->flags |= CCW_FLAG_IDA;
3895                 ccw->flags |= CCW_FLAG_SLI;
3896                 ccw++;
3897                 for (sectors = 0; sectors < start_padding_sectors; sectors += 8)
3898                         idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3899         }
3900         rq_for_each_segment(bv, req, iter) {
3901                 dst = page_address(bv.bv_page) + bv.bv_offset;
3902                 seg_len = bv.bv_len;
3903                 if (cmd == DASD_ECKD_CCW_READ_TRACK)
3904                         memset(dst, 0, seg_len);
3905                 if (!len_to_track_end) {
3906                         ccw[-1].flags |= CCW_FLAG_CC;
3907                         ccw->cmd_code = cmd;
3908                         /* maximum 3390 track size */
3909                         ccw->count = 57326;
3910                         /* 64k map to one track */
3911                         len_to_track_end = 65536;
3912                         ccw->cda = (__u32)(addr_t)idaws;
3913                         ccw->flags |= CCW_FLAG_IDA;
3914                         ccw->flags |= CCW_FLAG_SLI;
3915                         ccw++;
3916                 }
3917                 len_to_track_end -= seg_len;
3918                 idaws = idal_create_words(idaws, dst, seg_len);
3919         }
3920         for (sectors = 0; sectors < end_padding_sectors; sectors += 8)
3921                 idaws = idal_create_words(idaws, rawpadpage, PAGE_SIZE);
3922         if (blk_noretry_request(req) ||
3923             block->base->features & DASD_FEATURE_FAILFAST)
3924                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
3925         cqr->startdev = startdev;
3926         cqr->memdev = startdev;
3927         cqr->block = block;
3928         cqr->expires = startdev->default_expires * HZ;
3929         cqr->lpm = dasd_path_get_ppm(startdev);
3930         cqr->retries = startdev->default_retries;
3931         cqr->buildclk = get_tod_clock();
3932         cqr->status = DASD_CQR_FILLED;
3933
3934         return cqr;
3935 }
3936
3937
3938 static int
3939 dasd_eckd_free_cp(struct dasd_ccw_req *cqr, struct request *req)
3940 {
3941         struct dasd_eckd_private *private;
3942         struct ccw1 *ccw;
3943         struct req_iterator iter;
3944         struct bio_vec bv;
3945         char *dst, *cda;
3946         unsigned int blksize, blk_per_trk, off;
3947         sector_t recid;
3948         int status;
3949
3950         if (!dasd_page_cache)
3951                 goto out;
3952         private = cqr->block->base->private;
3953         blksize = cqr->block->bp_block;
3954         blk_per_trk = recs_per_track(&private->rdc_data, 0, blksize);
3955         recid = blk_rq_pos(req) >> cqr->block->s2b_shift;
3956         ccw = cqr->cpaddr;
3957         /* Skip over define extent & locate record. */
3958         ccw++;
3959         if (private->uses_cdl == 0 || recid > 2*blk_per_trk)
3960                 ccw++;
3961         rq_for_each_segment(bv, req, iter) {
3962                 dst = page_address(bv.bv_page) + bv.bv_offset;
3963                 for (off = 0; off < bv.bv_len; off += blksize) {
3964                         /* Skip locate record. */
3965                         if (private->uses_cdl && recid <= 2*blk_per_trk)
3966                                 ccw++;
3967                         if (dst) {
3968                                 if (ccw->flags & CCW_FLAG_IDA)
3969                                         cda = *((char **)((addr_t) ccw->cda));
3970                                 else
3971                                         cda = (char *)((addr_t) ccw->cda);
3972                                 if (dst != cda) {
3973                                         if (rq_data_dir(req) == READ)
3974                                                 memcpy(dst, cda, bv.bv_len);
3975                                         kmem_cache_free(dasd_page_cache,
3976                                             (void *)((addr_t)cda & PAGE_MASK));
3977                                 }
3978                                 dst = NULL;
3979                         }
3980                         ccw++;
3981                         recid++;
3982                 }
3983         }
3984 out:
3985         status = cqr->status == DASD_CQR_DONE;
3986         dasd_sfree_request(cqr, cqr->memdev);
3987         return status;
3988 }
3989
3990 /*
3991  * Modify ccw/tcw in cqr so it can be started on a base device.
3992  *
3993  * Note that this is not enough to restart the cqr!
3994  * Either reset cqr->startdev as well (summary unit check handling)
3995  * or restart via separate cqr (as in ERP handling).
3996  */
3997 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *cqr)
3998 {
3999         struct ccw1 *ccw;
4000         struct PFX_eckd_data *pfxdata;
4001         struct tcw *tcw;
4002         struct tccb *tccb;
4003         struct dcw *dcw;
4004
4005         if (cqr->cpmode == 1) {
4006                 tcw = cqr->cpaddr;
4007                 tccb = tcw_get_tccb(tcw);
4008                 dcw = (struct dcw *)&tccb->tca[0];
4009                 pfxdata = (struct PFX_eckd_data *)&dcw->cd[0];
4010                 pfxdata->validity.verify_base = 0;
4011                 pfxdata->validity.hyper_pav = 0;
4012         } else {
4013                 ccw = cqr->cpaddr;
4014                 pfxdata = cqr->data;
4015                 if (ccw->cmd_code == DASD_ECKD_CCW_PFX) {
4016                         pfxdata->validity.verify_base = 0;
4017                         pfxdata->validity.hyper_pav = 0;
4018                 }
4019         }
4020 }
4021
4022 #define DASD_ECKD_CHANQ_MAX_SIZE 4
4023
4024 static struct dasd_ccw_req *dasd_eckd_build_alias_cp(struct dasd_device *base,
4025                                                      struct dasd_block *block,
4026                                                      struct request *req)
4027 {
4028         struct dasd_eckd_private *private;
4029         struct dasd_device *startdev;
4030         unsigned long flags;
4031         struct dasd_ccw_req *cqr;
4032
4033         startdev = dasd_alias_get_start_dev(base);
4034         if (!startdev)
4035                 startdev = base;
4036         private = startdev->private;
4037         if (private->count >= DASD_ECKD_CHANQ_MAX_SIZE)
4038                 return ERR_PTR(-EBUSY);
4039
4040         spin_lock_irqsave(get_ccwdev_lock(startdev->cdev), flags);
4041         private->count++;
4042         if ((base->features & DASD_FEATURE_USERAW))
4043                 cqr = dasd_eckd_build_cp_raw(startdev, block, req);
4044         else
4045                 cqr = dasd_eckd_build_cp(startdev, block, req);
4046         if (IS_ERR(cqr))
4047                 private->count--;
4048         spin_unlock_irqrestore(get_ccwdev_lock(startdev->cdev), flags);
4049         return cqr;
4050 }
4051
4052 static int dasd_eckd_free_alias_cp(struct dasd_ccw_req *cqr,
4053                                    struct request *req)
4054 {
4055         struct dasd_eckd_private *private;
4056         unsigned long flags;
4057
4058         spin_lock_irqsave(get_ccwdev_lock(cqr->memdev->cdev), flags);
4059         private = cqr->memdev->private;
4060         private->count--;
4061         spin_unlock_irqrestore(get_ccwdev_lock(cqr->memdev->cdev), flags);
4062         return dasd_eckd_free_cp(cqr, req);
4063 }
4064
4065 static int
4066 dasd_eckd_fill_info(struct dasd_device * device,
4067                     struct dasd_information2_t * info)
4068 {
4069         struct dasd_eckd_private *private = device->private;
4070
4071         info->label_block = 2;
4072         info->FBA_layout = private->uses_cdl ? 0 : 1;
4073         info->format = private->uses_cdl ? DASD_FORMAT_CDL : DASD_FORMAT_LDL;
4074         info->characteristics_size = sizeof(private->rdc_data);
4075         memcpy(info->characteristics, &private->rdc_data,
4076                sizeof(private->rdc_data));
4077         info->confdata_size = min((unsigned long)private->conf_len,
4078                                   sizeof(info->configuration_data));
4079         memcpy(info->configuration_data, private->conf_data,
4080                info->confdata_size);
4081         return 0;
4082 }
4083
4084 /*
4085  * SECTION: ioctl functions for eckd devices.
4086  */
4087
4088 /*
4089  * Release device ioctl.
4090  * Buils a channel programm to releases a prior reserved
4091  * (see dasd_eckd_reserve) device.
4092  */
4093 static int
4094 dasd_eckd_release(struct dasd_device *device)
4095 {
4096         struct dasd_ccw_req *cqr;
4097         int rc;
4098         struct ccw1 *ccw;
4099         int useglobal;
4100
4101         if (!capable(CAP_SYS_ADMIN))
4102                 return -EACCES;
4103
4104         useglobal = 0;
4105         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4106         if (IS_ERR(cqr)) {
4107                 mutex_lock(&dasd_reserve_mutex);
4108                 useglobal = 1;
4109                 cqr = &dasd_reserve_req->cqr;
4110                 memset(cqr, 0, sizeof(*cqr));
4111                 memset(&dasd_reserve_req->ccw, 0,
4112                        sizeof(dasd_reserve_req->ccw));
4113                 cqr->cpaddr = &dasd_reserve_req->ccw;
4114                 cqr->data = &dasd_reserve_req->data;
4115                 cqr->magic = DASD_ECKD_MAGIC;
4116         }
4117         ccw = cqr->cpaddr;
4118         ccw->cmd_code = DASD_ECKD_CCW_RELEASE;
4119         ccw->flags |= CCW_FLAG_SLI;
4120         ccw->count = 32;
4121         ccw->cda = (__u32)(addr_t) cqr->data;
4122         cqr->startdev = device;
4123         cqr->memdev = device;
4124         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4125         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4126         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4127         cqr->expires = 2 * HZ;
4128         cqr->buildclk = get_tod_clock();
4129         cqr->status = DASD_CQR_FILLED;
4130
4131         rc = dasd_sleep_on_immediatly(cqr);
4132         if (!rc)
4133                 clear_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4134
4135         if (useglobal)
4136                 mutex_unlock(&dasd_reserve_mutex);
4137         else
4138                 dasd_sfree_request(cqr, cqr->memdev);
4139         return rc;
4140 }
4141
4142 /*
4143  * Reserve device ioctl.
4144  * Options are set to 'synchronous wait for interrupt' and
4145  * 'timeout the request'. This leads to a terminate IO if
4146  * the interrupt is outstanding for a certain time.
4147  */
4148 static int
4149 dasd_eckd_reserve(struct dasd_device *device)
4150 {
4151         struct dasd_ccw_req *cqr;
4152         int rc;
4153         struct ccw1 *ccw;
4154         int useglobal;
4155
4156         if (!capable(CAP_SYS_ADMIN))
4157                 return -EACCES;
4158
4159         useglobal = 0;
4160         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4161         if (IS_ERR(cqr)) {
4162                 mutex_lock(&dasd_reserve_mutex);
4163                 useglobal = 1;
4164                 cqr = &dasd_reserve_req->cqr;
4165                 memset(cqr, 0, sizeof(*cqr));
4166                 memset(&dasd_reserve_req->ccw, 0,
4167                        sizeof(dasd_reserve_req->ccw));
4168                 cqr->cpaddr = &dasd_reserve_req->ccw;
4169                 cqr->data = &dasd_reserve_req->data;
4170                 cqr->magic = DASD_ECKD_MAGIC;
4171         }
4172         ccw = cqr->cpaddr;
4173         ccw->cmd_code = DASD_ECKD_CCW_RESERVE;
4174         ccw->flags |= CCW_FLAG_SLI;
4175         ccw->count = 32;
4176         ccw->cda = (__u32)(addr_t) cqr->data;
4177         cqr->startdev = device;
4178         cqr->memdev = device;
4179         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4180         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4181         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4182         cqr->expires = 2 * HZ;
4183         cqr->buildclk = get_tod_clock();
4184         cqr->status = DASD_CQR_FILLED;
4185
4186         rc = dasd_sleep_on_immediatly(cqr);
4187         if (!rc)
4188                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4189
4190         if (useglobal)
4191                 mutex_unlock(&dasd_reserve_mutex);
4192         else
4193                 dasd_sfree_request(cqr, cqr->memdev);
4194         return rc;
4195 }
4196
4197 /*
4198  * Steal lock ioctl - unconditional reserve device.
4199  * Buils a channel programm to break a device's reservation.
4200  * (unconditional reserve)
4201  */
4202 static int
4203 dasd_eckd_steal_lock(struct dasd_device *device)
4204 {
4205         struct dasd_ccw_req *cqr;
4206         int rc;
4207         struct ccw1 *ccw;
4208         int useglobal;
4209
4210         if (!capable(CAP_SYS_ADMIN))
4211                 return -EACCES;
4212
4213         useglobal = 0;
4214         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
4215         if (IS_ERR(cqr)) {
4216                 mutex_lock(&dasd_reserve_mutex);
4217                 useglobal = 1;
4218                 cqr = &dasd_reserve_req->cqr;
4219                 memset(cqr, 0, sizeof(*cqr));
4220                 memset(&dasd_reserve_req->ccw, 0,
4221                        sizeof(dasd_reserve_req->ccw));
4222                 cqr->cpaddr = &dasd_reserve_req->ccw;
4223                 cqr->data = &dasd_reserve_req->data;
4224                 cqr->magic = DASD_ECKD_MAGIC;
4225         }
4226         ccw = cqr->cpaddr;
4227         ccw->cmd_code = DASD_ECKD_CCW_SLCK;
4228         ccw->flags |= CCW_FLAG_SLI;
4229         ccw->count = 32;
4230         ccw->cda = (__u32)(addr_t) cqr->data;
4231         cqr->startdev = device;
4232         cqr->memdev = device;
4233         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4234         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4235         cqr->retries = 2;       /* set retry counter to enable basic ERP */
4236         cqr->expires = 2 * HZ;
4237         cqr->buildclk = get_tod_clock();
4238         cqr->status = DASD_CQR_FILLED;
4239
4240         rc = dasd_sleep_on_immediatly(cqr);
4241         if (!rc)
4242                 set_bit(DASD_FLAG_IS_RESERVED, &device->flags);
4243
4244         if (useglobal)
4245                 mutex_unlock(&dasd_reserve_mutex);
4246         else
4247                 dasd_sfree_request(cqr, cqr->memdev);
4248         return rc;
4249 }
4250
4251 /*
4252  * SNID - Sense Path Group ID
4253  * This ioctl may be used in situations where I/O is stalled due to
4254  * a reserve, so if the normal dasd_smalloc_request fails, we use the
4255  * preallocated dasd_reserve_req.
4256  */
4257 static int dasd_eckd_snid(struct dasd_device *device,
4258                           void __user *argp)
4259 {
4260         struct dasd_ccw_req *cqr;
4261         int rc;
4262         struct ccw1 *ccw;
4263         int useglobal;
4264         struct dasd_snid_ioctl_data usrparm;
4265
4266         if (!capable(CAP_SYS_ADMIN))
4267                 return -EACCES;
4268
4269         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4270                 return -EFAULT;
4271
4272         useglobal = 0;
4273         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1,
4274                                    sizeof(struct dasd_snid_data), device);
4275         if (IS_ERR(cqr)) {
4276                 mutex_lock(&dasd_reserve_mutex);
4277                 useglobal = 1;
4278                 cqr = &dasd_reserve_req->cqr;
4279                 memset(cqr, 0, sizeof(*cqr));
4280                 memset(&dasd_reserve_req->ccw, 0,
4281                        sizeof(dasd_reserve_req->ccw));
4282                 cqr->cpaddr = &dasd_reserve_req->ccw;
4283                 cqr->data = &dasd_reserve_req->data;
4284                 cqr->magic = DASD_ECKD_MAGIC;
4285         }
4286         ccw = cqr->cpaddr;
4287         ccw->cmd_code = DASD_ECKD_CCW_SNID;
4288         ccw->flags |= CCW_FLAG_SLI;
4289         ccw->count = 12;
4290         ccw->cda = (__u32)(addr_t) cqr->data;
4291         cqr->startdev = device;
4292         cqr->memdev = device;
4293         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4294         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
4295         set_bit(DASD_CQR_ALLOW_SLOCK, &cqr->flags);
4296         cqr->retries = 5;
4297         cqr->expires = 10 * HZ;
4298         cqr->buildclk = get_tod_clock();
4299         cqr->status = DASD_CQR_FILLED;
4300         cqr->lpm = usrparm.path_mask;
4301
4302         rc = dasd_sleep_on_immediatly(cqr);
4303         /* verify that I/O processing didn't modify the path mask */
4304         if (!rc && usrparm.path_mask && (cqr->lpm != usrparm.path_mask))
4305                 rc = -EIO;
4306         if (!rc) {
4307                 usrparm.data = *((struct dasd_snid_data *)cqr->data);
4308                 if (copy_to_user(argp, &usrparm, sizeof(usrparm)))
4309                         rc = -EFAULT;
4310         }
4311
4312         if (useglobal)
4313                 mutex_unlock(&dasd_reserve_mutex);
4314         else
4315                 dasd_sfree_request(cqr, cqr->memdev);
4316         return rc;
4317 }
4318
4319 /*
4320  * Read performance statistics
4321  */
4322 static int
4323 dasd_eckd_performance(struct dasd_device *device, void __user *argp)
4324 {
4325         struct dasd_psf_prssd_data *prssdp;
4326         struct dasd_rssd_perf_stats_t *stats;
4327         struct dasd_ccw_req *cqr;
4328         struct ccw1 *ccw;
4329         int rc;
4330
4331         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
4332                                    (sizeof(struct dasd_psf_prssd_data) +
4333                                     sizeof(struct dasd_rssd_perf_stats_t)),
4334                                    device);
4335         if (IS_ERR(cqr)) {
4336                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4337                             "Could not allocate initialization request");
4338                 return PTR_ERR(cqr);
4339         }
4340         cqr->startdev = device;
4341         cqr->memdev = device;
4342         cqr->retries = 0;
4343         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
4344         cqr->expires = 10 * HZ;
4345
4346         /* Prepare for Read Subsystem Data */
4347         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4348         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
4349         prssdp->order = PSF_ORDER_PRSSD;
4350         prssdp->suborder = 0x01;        /* Performance Statistics */
4351         prssdp->varies[1] = 0x01;       /* Perf Statistics for the Subsystem */
4352
4353         ccw = cqr->cpaddr;
4354         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4355         ccw->count = sizeof(struct dasd_psf_prssd_data);
4356         ccw->flags |= CCW_FLAG_CC;
4357         ccw->cda = (__u32)(addr_t) prssdp;
4358
4359         /* Read Subsystem Data - Performance Statistics */
4360         stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4361         memset(stats, 0, sizeof(struct dasd_rssd_perf_stats_t));
4362
4363         ccw++;
4364         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4365         ccw->count = sizeof(struct dasd_rssd_perf_stats_t);
4366         ccw->cda = (__u32)(addr_t) stats;
4367
4368         cqr->buildclk = get_tod_clock();
4369         cqr->status = DASD_CQR_FILLED;
4370         rc = dasd_sleep_on(cqr);
4371         if (rc == 0) {
4372                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
4373                 stats = (struct dasd_rssd_perf_stats_t *) (prssdp + 1);
4374                 if (copy_to_user(argp, stats,
4375                                  sizeof(struct dasd_rssd_perf_stats_t)))
4376                         rc = -EFAULT;
4377         }
4378         dasd_sfree_request(cqr, cqr->memdev);
4379         return rc;
4380 }
4381
4382 /*
4383  * Get attributes (cache operations)
4384  * Returnes the cache attributes used in Define Extend (DE).
4385  */
4386 static int
4387 dasd_eckd_get_attrib(struct dasd_device *device, void __user *argp)
4388 {
4389         struct dasd_eckd_private *private = device->private;
4390         struct attrib_data_t attrib = private->attrib;
4391         int rc;
4392
4393         if (!capable(CAP_SYS_ADMIN))
4394                 return -EACCES;
4395         if (!argp)
4396                 return -EINVAL;
4397
4398         rc = 0;
4399         if (copy_to_user(argp, (long *) &attrib,
4400                          sizeof(struct attrib_data_t)))
4401                 rc = -EFAULT;
4402
4403         return rc;
4404 }
4405
4406 /*
4407  * Set attributes (cache operations)
4408  * Stores the attributes for cache operation to be used in Define Extend (DE).
4409  */
4410 static int
4411 dasd_eckd_set_attrib(struct dasd_device *device, void __user *argp)
4412 {
4413         struct dasd_eckd_private *private = device->private;
4414         struct attrib_data_t attrib;
4415
4416         if (!capable(CAP_SYS_ADMIN))
4417                 return -EACCES;
4418         if (!argp)
4419                 return -EINVAL;
4420
4421         if (copy_from_user(&attrib, argp, sizeof(struct attrib_data_t)))
4422                 return -EFAULT;
4423         private->attrib = attrib;
4424
4425         dev_info(&device->cdev->dev,
4426                  "The DASD cache mode was set to %x (%i cylinder prestage)\n",
4427                  private->attrib.operation, private->attrib.nr_cyl);
4428         return 0;
4429 }
4430
4431 /*
4432  * Issue syscall I/O to EMC Symmetrix array.
4433  * CCWs are PSF and RSSD
4434  */
4435 static int dasd_symm_io(struct dasd_device *device, void __user *argp)
4436 {
4437         struct dasd_symmio_parms usrparm;
4438         char *psf_data, *rssd_result;
4439         struct dasd_ccw_req *cqr;
4440         struct ccw1 *ccw;
4441         char psf0, psf1;
4442         int rc;
4443
4444         if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
4445                 return -EACCES;
4446         psf0 = psf1 = 0;
4447
4448         /* Copy parms from caller */
4449         rc = -EFAULT;
4450         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
4451                 goto out;
4452         if (is_compat_task()) {
4453                 /* Make sure pointers are sane even on 31 bit. */
4454                 rc = -EINVAL;
4455                 if ((usrparm.psf_data >> 32) != 0)
4456                         goto out;
4457                 if ((usrparm.rssd_result >> 32) != 0)
4458                         goto out;
4459                 usrparm.psf_data &= 0x7fffffffULL;
4460                 usrparm.rssd_result &= 0x7fffffffULL;
4461         }
4462         /* alloc I/O data area */
4463         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
4464         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);
4465         if (!psf_data || !rssd_result) {
4466                 rc = -ENOMEM;
4467                 goto out_free;
4468         }
4469
4470         /* get syscall header from user space */
4471         rc = -EFAULT;
4472         if (copy_from_user(psf_data,
4473                            (void __user *)(unsigned long) usrparm.psf_data,
4474                            usrparm.psf_data_len))
4475                 goto out_free;
4476         psf0 = psf_data[0];
4477         psf1 = psf_data[1];
4478
4479         /* setup CCWs for PSF + RSSD */
4480         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
4481         if (IS_ERR(cqr)) {
4482                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4483                         "Could not allocate initialization request");
4484                 rc = PTR_ERR(cqr);
4485                 goto out_free;
4486         }
4487
4488         cqr->startdev = device;
4489         cqr->memdev = device;
4490         cqr->retries = 3;
4491         cqr->expires = 10 * HZ;
4492         cqr->buildclk = get_tod_clock();
4493         cqr->status = DASD_CQR_FILLED;
4494
4495         /* Build the ccws */
4496         ccw = cqr->cpaddr;
4497
4498         /* PSF ccw */
4499         ccw->cmd_code = DASD_ECKD_CCW_PSF;
4500         ccw->count = usrparm.psf_data_len;
4501         ccw->flags |= CCW_FLAG_CC;
4502         ccw->cda = (__u32)(addr_t) psf_data;
4503
4504         ccw++;
4505
4506         /* RSSD ccw  */
4507         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
4508         ccw->count = usrparm.rssd_result_len;
4509         ccw->flags = CCW_FLAG_SLI ;
4510         ccw->cda = (__u32)(addr_t) rssd_result;
4511
4512         rc = dasd_sleep_on(cqr);
4513         if (rc)
4514                 goto out_sfree;
4515
4516         rc = -EFAULT;
4517         if (copy_to_user((void __user *)(unsigned long) usrparm.rssd_result,
4518                            rssd_result, usrparm.rssd_result_len))
4519                 goto out_sfree;
4520         rc = 0;
4521
4522 out_sfree:
4523         dasd_sfree_request(cqr, cqr->memdev);
4524 out_free:
4525         kfree(rssd_result);
4526         kfree(psf_data);
4527 out:
4528         DBF_DEV_EVENT(DBF_WARNING, device,
4529                       "Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
4530                       (int) psf0, (int) psf1, rc);
4531         return rc;
4532 }
4533
4534 static int
4535 dasd_eckd_ioctl(struct dasd_block *block, unsigned int cmd, void __user *argp)
4536 {
4537         struct dasd_device *device = block->base;
4538
4539         switch (cmd) {
4540         case BIODASDGATTR:
4541                 return dasd_eckd_get_attrib(device, argp);
4542         case BIODASDSATTR:
4543                 return dasd_eckd_set_attrib(device, argp);
4544         case BIODASDPSRD:
4545                 return dasd_eckd_performance(device, argp);
4546         case BIODASDRLSE:
4547                 return dasd_eckd_release(device);
4548         case BIODASDRSRV:
4549                 return dasd_eckd_reserve(device);
4550         case BIODASDSLCK:
4551                 return dasd_eckd_steal_lock(device);
4552         case BIODASDSNID:
4553                 return dasd_eckd_snid(device, argp);
4554         case BIODASDSYMMIO:
4555                 return dasd_symm_io(device, argp);
4556         default:
4557                 return -ENOTTY;
4558         }
4559 }
4560
4561 /*
4562  * Dump the range of CCWs into 'page' buffer
4563  * and return number of printed chars.
4564  */
4565 static int
4566 dasd_eckd_dump_ccw_range(struct ccw1 *from, struct ccw1 *to, char *page)
4567 {
4568         int len, count;
4569         char *datap;
4570
4571         len = 0;
4572         while (from <= to) {
4573                 len += sprintf(page + len, PRINTK_HEADER
4574                                " CCW %p: %08X %08X DAT:",
4575                                from, ((int *) from)[0], ((int *) from)[1]);
4576
4577                 /* get pointer to data (consider IDALs) */
4578                 if (from->flags & CCW_FLAG_IDA)
4579                         datap = (char *) *((addr_t *) (addr_t) from->cda);
4580                 else
4581                         datap = (char *) ((addr_t) from->cda);
4582
4583                 /* dump data (max 32 bytes) */
4584                 for (count = 0; count < from->count && count < 32; count++) {
4585                         if (count % 8 == 0) len += sprintf(page + len, " ");
4586                         if (count % 4 == 0) len += sprintf(page + len, " ");
4587                         len += sprintf(page + len, "%02x", datap[count]);
4588                 }
4589                 len += sprintf(page + len, "\n");
4590                 from++;
4591         }
4592         return len;
4593 }
4594
4595 static void
4596 dasd_eckd_dump_sense_dbf(struct dasd_device *device, struct irb *irb,
4597                          char *reason)
4598 {
4599         u64 *sense;
4600         u64 *stat;
4601
4602         sense = (u64 *) dasd_get_sense(irb);
4603         stat = (u64 *) &irb->scsw;
4604         if (sense) {
4605                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : "
4606                               "%016llx %016llx %016llx %016llx",
4607                               reason, *stat, *((u32 *) (stat + 1)),
4608                               sense[0], sense[1], sense[2], sense[3]);
4609         } else {
4610                 DBF_DEV_EVENT(DBF_EMERG, device, "%s: %016llx %08x : %s",
4611                               reason, *stat, *((u32 *) (stat + 1)),
4612                               "NO VALID SENSE");
4613         }
4614 }
4615
4616 /*
4617  * Print sense data and related channel program.
4618  * Parts are printed because printk buffer is only 1024 bytes.
4619  */
4620 static void dasd_eckd_dump_sense_ccw(struct dasd_device *device,
4621                                  struct dasd_ccw_req *req, struct irb *irb)
4622 {
4623         char *page;
4624         struct ccw1 *first, *last, *fail, *from, *to;
4625         int len, sl, sct;
4626
4627         page = (char *) get_zeroed_page(GFP_ATOMIC);
4628         if (page == NULL) {
4629                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
4630                               "No memory to dump sense data\n");
4631                 return;
4632         }
4633         /* dump the sense data */
4634         len = sprintf(page, PRINTK_HEADER
4635                       " I/O status report for device %s:\n",
4636                       dev_name(&device->cdev->dev));
4637         len += sprintf(page + len, PRINTK_HEADER
4638                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4639                        "CS:%02X RC:%d\n",
4640                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4641                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4642                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4643                        req ? req->intrc : 0);
4644         len += sprintf(page + len, PRINTK_HEADER
4645                        " device %s: Failing CCW: %p\n",
4646                        dev_name(&device->cdev->dev),
4647                        (void *) (addr_t) irb->scsw.cmd.cpa);
4648         if (irb->esw.esw0.erw.cons) {
4649                 for (sl = 0; sl < 4; sl++) {
4650                         len += sprintf(page + len, PRINTK_HEADER
4651                                        " Sense(hex) %2d-%2d:",
4652                                        (8 * sl), ((8 * sl) + 7));
4653
4654                         for (sct = 0; sct < 8; sct++) {
4655                                 len += sprintf(page + len, " %02x",
4656                                                irb->ecw[8 * sl + sct]);
4657                         }
4658                         len += sprintf(page + len, "\n");
4659                 }
4660
4661                 if (irb->ecw[27] & DASD_SENSE_BIT_0) {
4662                         /* 24 Byte Sense Data */
4663                         sprintf(page + len, PRINTK_HEADER
4664                                 " 24 Byte: %x MSG %x, "
4665                                 "%s MSGb to SYSOP\n",
4666                                 irb->ecw[7] >> 4, irb->ecw[7] & 0x0f,
4667                                 irb->ecw[1] & 0x10 ? "" : "no");
4668                 } else {
4669                         /* 32 Byte Sense Data */
4670                         sprintf(page + len, PRINTK_HEADER
4671                                 " 32 Byte: Format: %x "
4672                                 "Exception class %x\n",
4673                                 irb->ecw[6] & 0x0f, irb->ecw[22] >> 4);
4674                 }
4675         } else {
4676                 sprintf(page + len, PRINTK_HEADER
4677                         " SORRY - NO VALID SENSE AVAILABLE\n");
4678         }
4679         printk(KERN_ERR "%s", page);
4680
4681         if (req) {
4682                 /* req == NULL for unsolicited interrupts */
4683                 /* dump the Channel Program (max 140 Bytes per line) */
4684                 /* Count CCW and print first CCWs (maximum 1024 % 140 = 7) */
4685                 first = req->cpaddr;
4686                 for (last = first; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
4687                 to = min(first + 6, last);
4688                 len = sprintf(page, PRINTK_HEADER
4689                               " Related CP in req: %p\n", req);
4690                 dasd_eckd_dump_ccw_range(first, to, page + len);
4691                 printk(KERN_ERR "%s", page);
4692
4693                 /* print failing CCW area (maximum 4) */
4694                 /* scsw->cda is either valid or zero  */
4695                 len = 0;
4696                 from = ++to;
4697                 fail = (struct ccw1 *)(addr_t)
4698                                 irb->scsw.cmd.cpa; /* failing CCW */
4699                 if (from <  fail - 2) {
4700                         from = fail - 2;     /* there is a gap - print header */
4701                         len += sprintf(page, PRINTK_HEADER "......\n");
4702                 }
4703                 to = min(fail + 1, last);
4704                 len += dasd_eckd_dump_ccw_range(from, to, page + len);
4705
4706                 /* print last CCWs (maximum 2) */
4707                 from = max(from, ++to);
4708                 if (from < last - 1) {
4709                         from = last - 1;     /* there is a gap - print header */
4710                         len += sprintf(page + len, PRINTK_HEADER "......\n");
4711                 }
4712                 len += dasd_eckd_dump_ccw_range(from, last, page + len);
4713                 if (len > 0)
4714                         printk(KERN_ERR "%s", page);
4715         }
4716         free_page((unsigned long) page);
4717 }
4718
4719
4720 /*
4721  * Print sense data from a tcw.
4722  */
4723 static void dasd_eckd_dump_sense_tcw(struct dasd_device *device,
4724                                  struct dasd_ccw_req *req, struct irb *irb)
4725 {
4726         char *page;
4727         int len, sl, sct, residual;
4728         struct tsb *tsb;
4729         u8 *sense, *rcq;
4730
4731         page = (char *) get_zeroed_page(GFP_ATOMIC);
4732         if (page == NULL) {
4733                 DBF_DEV_EVENT(DBF_WARNING, device, " %s",
4734                             "No memory to dump sense data");
4735                 return;
4736         }
4737         /* dump the sense data */
4738         len = sprintf(page, PRINTK_HEADER
4739                       " I/O status report for device %s:\n",
4740                       dev_name(&device->cdev->dev));
4741         len += sprintf(page + len, PRINTK_HEADER
4742                        " in req: %p CC:%02X FC:%02X AC:%02X SC:%02X DS:%02X "
4743                        "CS:%02X fcxs:%02X schxs:%02X RC:%d\n",
4744                        req, scsw_cc(&irb->scsw), scsw_fctl(&irb->scsw),
4745                        scsw_actl(&irb->scsw), scsw_stctl(&irb->scsw),
4746                        scsw_dstat(&irb->scsw), scsw_cstat(&irb->scsw),
4747                        irb->scsw.tm.fcxs,
4748                        (irb->scsw.tm.ifob << 7) | irb->scsw.tm.sesq,
4749                        req ? req->intrc : 0);
4750         len += sprintf(page + len, PRINTK_HEADER
4751                        " device %s: Failing TCW: %p\n",
4752                        dev_name(&device->cdev->dev),
4753                        (void *) (addr_t) irb->scsw.tm.tcw);
4754
4755         tsb = NULL;
4756         sense = NULL;
4757         if (irb->scsw.tm.tcw && (irb->scsw.tm.fcxs & 0x01))
4758                 tsb = tcw_get_tsb(
4759                         (struct tcw *)(unsigned long)irb->scsw.tm.tcw);
4760
4761         if (tsb) {
4762                 len += sprintf(page + len, PRINTK_HEADER
4763                                " tsb->length %d\n", tsb->length);
4764                 len += sprintf(page + len, PRINTK_HEADER
4765                                " tsb->flags %x\n", tsb->flags);
4766                 len += sprintf(page + len, PRINTK_HEADER
4767                                " tsb->dcw_offset %d\n", tsb->dcw_offset);
4768                 len += sprintf(page + len, PRINTK_HEADER
4769                                " tsb->count %d\n", tsb->count);
4770                 residual = tsb->count - 28;
4771                 len += sprintf(page + len, PRINTK_HEADER
4772                                " residual %d\n", residual);
4773
4774                 switch (tsb->flags & 0x07) {
4775                 case 1: /* tsa_iostat */
4776                         len += sprintf(page + len, PRINTK_HEADER
4777                                " tsb->tsa.iostat.dev_time %d\n",
4778                                        tsb->tsa.iostat.dev_time);
4779                         len += sprintf(page + len, PRINTK_HEADER
4780                                " tsb->tsa.iostat.def_time %d\n",
4781                                        tsb->tsa.iostat.def_time);
4782                         len += sprintf(page + len, PRINTK_HEADER
4783                                " tsb->tsa.iostat.queue_time %d\n",
4784                                        tsb->tsa.iostat.queue_time);
4785                         len += sprintf(page + len, PRINTK_HEADER
4786                                " tsb->tsa.iostat.dev_busy_time %d\n",
4787                                        tsb->tsa.iostat.dev_busy_time);
4788                         len += sprintf(page + len, PRINTK_HEADER
4789                                " tsb->tsa.iostat.dev_act_time %d\n",
4790                                        tsb->tsa.iostat.dev_act_time);
4791                         sense = tsb->tsa.iostat.sense;
4792                         break;
4793                 case 2: /* ts_ddpc */
4794                         len += sprintf(page + len, PRINTK_HEADER
4795                                " tsb->tsa.ddpc.rc %d\n", tsb->tsa.ddpc.rc);
4796                         for (sl = 0; sl < 2; sl++) {
4797                                 len += sprintf(page + len, PRINTK_HEADER
4798                                                " tsb->tsa.ddpc.rcq %2d-%2d: ",
4799                                                (8 * sl), ((8 * sl) + 7));
4800                                 rcq = tsb->tsa.ddpc.rcq;
4801                                 for (sct = 0; sct < 8; sct++) {
4802                                         len += sprintf(page + len, " %02x",
4803                                                        rcq[8 * sl + sct]);
4804                                 }
4805                                 len += sprintf(page + len, "\n");
4806                         }
4807                         sense = tsb->tsa.ddpc.sense;
4808                         break;
4809                 case 3: /* tsa_intrg */
4810                         len += sprintf(page + len, PRINTK_HEADER
4811                                       " tsb->tsa.intrg.: not supported yet\n");
4812                         break;
4813                 }
4814
4815                 if (sense) {
4816                         for (sl = 0; sl < 4; sl++) {
4817                                 len += sprintf(page + len, PRINTK_HEADER
4818                                                " Sense(hex) %2d-%2d:",
4819                                                (8 * sl), ((8 * sl) + 7));
4820                                 for (sct = 0; sct < 8; sct++) {
4821                                         len += sprintf(page + len, " %02x",
4822                                                        sense[8 * sl + sct]);
4823                                 }
4824                                 len += sprintf(page + len, "\n");
4825                         }
4826
4827                         if (sense[27] & DASD_SENSE_BIT_0) {
4828                                 /* 24 Byte Sense Data */
4829                                 sprintf(page + len, PRINTK_HEADER
4830                                         " 24 Byte: %x MSG %x, "
4831                                         "%s MSGb to SYSOP\n",
4832                                         sense[7] >> 4, sense[7] & 0x0f,
4833                                         sense[1] & 0x10 ? "" : "no");
4834                         } else {
4835                                 /* 32 Byte Sense Data */
4836                                 sprintf(page + len, PRINTK_HEADER
4837                                         " 32 Byte: Format: %x "
4838                                         "Exception class %x\n",
4839                                         sense[6] & 0x0f, sense[22] >> 4);
4840                         }
4841                 } else {
4842                         sprintf(page + len, PRINTK_HEADER
4843                                 " SORRY - NO VALID SENSE AVAILABLE\n");
4844                 }
4845         } else {
4846                 sprintf(page + len, PRINTK_HEADER
4847                         " SORRY - NO TSB DATA AVAILABLE\n");
4848         }
4849         printk(KERN_ERR "%s", page);
4850         free_page((unsigned long) page);
4851 }
4852
4853 static void dasd_eckd_dump_sense(struct dasd_device *device,
4854                                  struct dasd_ccw_req *req, struct irb *irb)
4855 {
4856         u8 *sense = dasd_get_sense(irb);
4857
4858         if (scsw_is_tm(&irb->scsw)) {
4859                 /*
4860                  * In some cases the 'File Protected' or 'Incorrect Length'
4861                  * error might be expected and log messages shouldn't be written
4862                  * then. Check if the according suppress bit is set.
4863                  */
4864                 if (sense && (sense[1] & SNS1_FILE_PROTECTED) &&
4865                     test_bit(DASD_CQR_SUPPRESS_FP, &req->flags))
4866                         return;
4867                 if (scsw_cstat(&irb->scsw) == 0x40 &&
4868                     test_bit(DASD_CQR_SUPPRESS_IL, &req->flags))
4869                         return;
4870
4871                 dasd_eckd_dump_sense_tcw(device, req, irb);
4872         } else {
4873                 /*
4874                  * In some cases the 'Command Reject' or 'No Record Found'
4875                  * error might be expected and log messages shouldn't be
4876                  * written then. Check if the according suppress bit is set.
4877                  */
4878                 if (sense && sense[0] & SNS0_CMD_REJECT &&
4879                     test_bit(DASD_CQR_SUPPRESS_CR, &req->flags))
4880                         return;
4881
4882                 if (sense && sense[1] & SNS1_NO_REC_FOUND &&
4883                     test_bit(DASD_CQR_SUPPRESS_NRF, &req->flags))
4884                         return;
4885
4886                 dasd_eckd_dump_sense_ccw(device, req, irb);
4887         }
4888 }
4889
4890 static int dasd_eckd_pm_freeze(struct dasd_device *device)
4891 {
4892         /*
4893          * the device should be disconnected from our LCU structure
4894          * on restore we will reconnect it and reread LCU specific
4895          * information like PAV support that might have changed
4896          */
4897         dasd_alias_remove_device(device);
4898         dasd_alias_disconnect_device_from_lcu(device);
4899
4900         return 0;
4901 }
4902
4903 static int dasd_eckd_restore_device(struct dasd_device *device)
4904 {
4905         struct dasd_eckd_private *private = device->private;
4906         struct dasd_eckd_characteristics temp_rdc_data;
4907         int rc;
4908         struct dasd_uid temp_uid;
4909         unsigned long flags;
4910         unsigned long cqr_flags = 0;
4911
4912         /* Read Configuration Data */
4913         rc = dasd_eckd_read_conf(device);
4914         if (rc) {
4915                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4916                                 "Read configuration data failed, rc=%d", rc);
4917                 goto out_err;
4918         }
4919
4920         dasd_eckd_get_uid(device, &temp_uid);
4921         /* Generate device unique id */
4922         rc = dasd_eckd_generate_uid(device);
4923         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4924         if (memcmp(&private->uid, &temp_uid, sizeof(struct dasd_uid)) != 0)
4925                 dev_err(&device->cdev->dev, "The UID of the DASD has "
4926                         "changed\n");
4927         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4928         if (rc)
4929                 goto out_err;
4930
4931         /* register lcu with alias handling, enable PAV if this is a new lcu */
4932         rc = dasd_alias_make_device_known_to_lcu(device);
4933         if (rc)
4934                 goto out_err;
4935
4936         set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr_flags);
4937         dasd_eckd_validate_server(device, cqr_flags);
4938
4939         /* RE-Read Configuration Data */
4940         rc = dasd_eckd_read_conf(device);
4941         if (rc) {
4942                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4943                         "Read configuration data failed, rc=%d", rc);
4944                 goto out_err2;
4945         }
4946
4947         /* Read Feature Codes */
4948         dasd_eckd_read_features(device);
4949
4950         /* Read Device Characteristics */
4951         rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
4952                                          &temp_rdc_data, 64);
4953         if (rc) {
4954                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
4955                                 "Read device characteristic failed, rc=%d", rc);
4956                 goto out_err2;
4957         }
4958         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4959         memcpy(&private->rdc_data, &temp_rdc_data, sizeof(temp_rdc_data));
4960         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4961
4962         /* add device to alias management */
4963         dasd_alias_add_device(device);
4964
4965         return 0;
4966
4967 out_err2:
4968         dasd_alias_disconnect_device_from_lcu(device);
4969 out_err:
4970         return -1;
4971 }
4972
4973 static int dasd_eckd_reload_device(struct dasd_device *device)
4974 {
4975         struct dasd_eckd_private *private = device->private;
4976         int rc, old_base;
4977         char print_uid[60];
4978         struct dasd_uid uid;
4979         unsigned long flags;
4980
4981         /*
4982          * remove device from alias handling to prevent new requests
4983          * from being scheduled on the wrong alias device
4984          */
4985         dasd_alias_remove_device(device);
4986
4987         spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
4988         old_base = private->uid.base_unit_addr;
4989         spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
4990
4991         /* Read Configuration Data */
4992         rc = dasd_eckd_read_conf(device);
4993         if (rc)
4994                 goto out_err;
4995
4996         rc = dasd_eckd_generate_uid(device);
4997         if (rc)
4998                 goto out_err;
4999         /*
5000          * update unit address configuration and
5001          * add device to alias management
5002          */
5003         dasd_alias_update_add_device(device);
5004
5005         dasd_eckd_get_uid(device, &uid);
5006
5007         if (old_base != uid.base_unit_addr) {
5008                 if (strlen(uid.vduit) > 0)
5009                         snprintf(print_uid, sizeof(print_uid),
5010                                  "%s.%s.%04x.%02x.%s", uid.vendor, uid.serial,
5011                                  uid.ssid, uid.base_unit_addr, uid.vduit);
5012                 else
5013                         snprintf(print_uid, sizeof(print_uid),
5014                                  "%s.%s.%04x.%02x", uid.vendor, uid.serial,
5015                                  uid.ssid, uid.base_unit_addr);
5016
5017                 dev_info(&device->cdev->dev,
5018                          "An Alias device was reassigned to a new base device "
5019                          "with UID: %s\n", print_uid);
5020         }
5021         return 0;
5022
5023 out_err:
5024         return -1;
5025 }
5026
5027 static int dasd_eckd_read_message_buffer(struct dasd_device *device,
5028                                          struct dasd_rssd_messages *messages,
5029                                          __u8 lpum)
5030 {
5031         struct dasd_rssd_messages *message_buf;
5032         struct dasd_psf_prssd_data *prssdp;
5033         struct dasd_ccw_req *cqr;
5034         struct ccw1 *ccw;
5035         int rc;
5036
5037         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5038                                    (sizeof(struct dasd_psf_prssd_data) +
5039                                     sizeof(struct dasd_rssd_messages)),
5040                                    device);
5041         if (IS_ERR(cqr)) {
5042                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5043                                 "Could not allocate read message buffer request");
5044                 return PTR_ERR(cqr);
5045         }
5046
5047         cqr->lpm = lpum;
5048 retry:
5049         cqr->startdev = device;
5050         cqr->memdev = device;
5051         cqr->block = NULL;
5052         cqr->expires = 10 * HZ;
5053         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5054         /* dasd_sleep_on_immediatly does not do complex error
5055          * recovery so clear erp flag and set retry counter to
5056          * do basic erp */
5057         clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
5058         cqr->retries = 256;
5059
5060         /* Prepare for Read Subsystem Data */
5061         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5062         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5063         prssdp->order = PSF_ORDER_PRSSD;
5064         prssdp->suborder = 0x03;        /* Message Buffer */
5065         /* all other bytes of prssdp must be zero */
5066
5067         ccw = cqr->cpaddr;
5068         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5069         ccw->count = sizeof(struct dasd_psf_prssd_data);
5070         ccw->flags |= CCW_FLAG_CC;
5071         ccw->flags |= CCW_FLAG_SLI;
5072         ccw->cda = (__u32)(addr_t) prssdp;
5073
5074         /* Read Subsystem Data - message buffer */
5075         message_buf = (struct dasd_rssd_messages *) (prssdp + 1);
5076         memset(message_buf, 0, sizeof(struct dasd_rssd_messages));
5077
5078         ccw++;
5079         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5080         ccw->count = sizeof(struct dasd_rssd_messages);
5081         ccw->flags |= CCW_FLAG_SLI;
5082         ccw->cda = (__u32)(addr_t) message_buf;
5083
5084         cqr->buildclk = get_tod_clock();
5085         cqr->status = DASD_CQR_FILLED;
5086         rc = dasd_sleep_on_immediatly(cqr);
5087         if (rc == 0) {
5088                 prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5089                 message_buf = (struct dasd_rssd_messages *)
5090                         (prssdp + 1);
5091                 memcpy(messages, message_buf,
5092                        sizeof(struct dasd_rssd_messages));
5093         } else if (cqr->lpm) {
5094                 /*
5095                  * on z/VM we might not be able to do I/O on the requested path
5096                  * but instead we get the required information on any path
5097                  * so retry with open path mask
5098                  */
5099                 cqr->lpm = 0;
5100                 goto retry;
5101         } else
5102                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5103                                 "Reading messages failed with rc=%d\n"
5104                                 , rc);
5105         dasd_sfree_request(cqr, cqr->memdev);
5106         return rc;
5107 }
5108
5109 static int dasd_eckd_query_host_access(struct dasd_device *device,
5110                                        struct dasd_psf_query_host_access *data)
5111 {
5112         struct dasd_eckd_private *private = device->private;
5113         struct dasd_psf_query_host_access *host_access;
5114         struct dasd_psf_prssd_data *prssdp;
5115         struct dasd_ccw_req *cqr;
5116         struct ccw1 *ccw;
5117         int rc;
5118
5119         /* not available for HYPER PAV alias devices */
5120         if (!device->block && private->lcu->pav == HYPER_PAV)
5121                 return -EOPNOTSUPP;
5122
5123         /* may not be supported by the storage server */
5124         if (!(private->features.feature[14] & 0x80))
5125                 return -EOPNOTSUPP;
5126
5127         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
5128                                    sizeof(struct dasd_psf_prssd_data) + 1,
5129                                    device);
5130         if (IS_ERR(cqr)) {
5131                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5132                                 "Could not allocate read message buffer request");
5133                 return PTR_ERR(cqr);
5134         }
5135         host_access = kzalloc(sizeof(*host_access), GFP_KERNEL | GFP_DMA);
5136         if (!host_access) {
5137                 dasd_sfree_request(cqr, device);
5138                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5139                                 "Could not allocate host_access buffer");
5140                 return -ENOMEM;
5141         }
5142         cqr->startdev = device;
5143         cqr->memdev = device;
5144         cqr->block = NULL;
5145         cqr->retries = 256;
5146         cqr->expires = 10 * HZ;
5147
5148         /* Prepare for Read Subsystem Data */
5149         prssdp = (struct dasd_psf_prssd_data *) cqr->data;
5150         memset(prssdp, 0, sizeof(struct dasd_psf_prssd_data));
5151         prssdp->order = PSF_ORDER_PRSSD;
5152         prssdp->suborder = PSF_SUBORDER_QHA;    /* query host access */
5153         /* LSS and Volume that will be queried */
5154         prssdp->lss = private->ned->ID;
5155         prssdp->volume = private->ned->unit_addr;
5156         /* all other bytes of prssdp must be zero */
5157
5158         ccw = cqr->cpaddr;
5159         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5160         ccw->count = sizeof(struct dasd_psf_prssd_data);
5161         ccw->flags |= CCW_FLAG_CC;
5162         ccw->flags |= CCW_FLAG_SLI;
5163         ccw->cda = (__u32)(addr_t) prssdp;
5164
5165         /* Read Subsystem Data - query host access */
5166         ccw++;
5167         ccw->cmd_code = DASD_ECKD_CCW_RSSD;
5168         ccw->count = sizeof(struct dasd_psf_query_host_access);
5169         ccw->flags |= CCW_FLAG_SLI;
5170         ccw->cda = (__u32)(addr_t) host_access;
5171
5172         cqr->buildclk = get_tod_clock();
5173         cqr->status = DASD_CQR_FILLED;
5174         /* the command might not be supported, suppress error message */
5175         __set_bit(DASD_CQR_SUPPRESS_CR, &cqr->flags);
5176         rc = dasd_sleep_on_interruptible(cqr);
5177         if (rc == 0) {
5178                 *data = *host_access;
5179         } else {
5180                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev,
5181                                 "Reading host access data failed with rc=%d\n",
5182                                 rc);
5183                 rc = -EOPNOTSUPP;
5184         }
5185
5186         dasd_sfree_request(cqr, cqr->memdev);
5187         kfree(host_access);
5188         return rc;
5189 }
5190 /*
5191  * return number of grouped devices
5192  */
5193 static int dasd_eckd_host_access_count(struct dasd_device *device)
5194 {
5195         struct dasd_psf_query_host_access *access;
5196         struct dasd_ckd_path_group_entry *entry;
5197         struct dasd_ckd_host_information *info;
5198         int count = 0;
5199         int rc, i;
5200
5201         access = kzalloc(sizeof(*access), GFP_NOIO);
5202         if (!access) {
5203                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5204                                 "Could not allocate access buffer");
5205                 return -ENOMEM;
5206         }
5207         rc = dasd_eckd_query_host_access(device, access);
5208         if (rc) {
5209                 kfree(access);
5210                 return rc;
5211         }
5212
5213         info = (struct dasd_ckd_host_information *)
5214                 access->host_access_information;
5215         for (i = 0; i < info->entry_count; i++) {
5216                 entry = (struct dasd_ckd_path_group_entry *)
5217                         (info->entry + i * info->entry_size);
5218                 if (entry->status_flags & DASD_ECKD_PG_GROUPED)
5219                         count++;
5220         }
5221
5222         kfree(access);
5223         return count;
5224 }
5225
5226 /*
5227  * write host access information to a sequential file
5228  */
5229 static int dasd_hosts_print(struct dasd_device *device, struct seq_file *m)
5230 {
5231         struct dasd_psf_query_host_access *access;
5232         struct dasd_ckd_path_group_entry *entry;
5233         struct dasd_ckd_host_information *info;
5234         char sysplex[9] = "";
5235         int rc, i;
5236
5237         access = kzalloc(sizeof(*access), GFP_NOIO);
5238         if (!access) {
5239                 DBF_EVENT_DEVID(DBF_WARNING, device->cdev, "%s",
5240                                 "Could not allocate access buffer");
5241                 return -ENOMEM;
5242         }
5243         rc = dasd_eckd_query_host_access(device, access);
5244         if (rc) {
5245                 kfree(access);
5246                 return rc;
5247         }
5248
5249         info = (struct dasd_ckd_host_information *)
5250                 access->host_access_information;
5251         for (i = 0; i < info->entry_count; i++) {
5252                 entry = (struct dasd_ckd_path_group_entry *)
5253                         (info->entry + i * info->entry_size);
5254                 /* PGID */
5255                 seq_printf(m, "pgid %*phN\n", 11, entry->pgid);
5256                 /* FLAGS */
5257                 seq_printf(m, "status_flags %02x\n", entry->status_flags);
5258                 /* SYSPLEX NAME */
5259                 memcpy(&sysplex, &entry->sysplex_name, sizeof(sysplex) - 1);
5260                 EBCASC(sysplex, sizeof(sysplex));
5261                 seq_printf(m, "sysplex_name %8s\n", sysplex);
5262                 /* SUPPORTED CYLINDER */
5263                 seq_printf(m, "supported_cylinder %d\n", entry->cylinder);
5264                 /* TIMESTAMP */
5265                 seq_printf(m, "timestamp %lu\n", (unsigned long)
5266                            entry->timestamp);
5267         }
5268         kfree(access);
5269
5270         return 0;
5271 }
5272
5273 /*
5274  * Perform Subsystem Function - CUIR response
5275  */
5276 static int
5277 dasd_eckd_psf_cuir_response(struct dasd_device *device, int response,
5278                             __u32 message_id, __u8 lpum)
5279 {
5280         struct dasd_psf_cuir_response *psf_cuir;
5281         int pos = pathmask_to_pos(lpum);
5282         struct dasd_ccw_req *cqr;
5283         struct ccw1 *ccw;
5284         int rc;
5285
5286         cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
5287                                   sizeof(struct dasd_psf_cuir_response),
5288                                   device);
5289
5290         if (IS_ERR(cqr)) {
5291                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5292                            "Could not allocate PSF-CUIR request");
5293                 return PTR_ERR(cqr);
5294         }
5295
5296         psf_cuir = (struct dasd_psf_cuir_response *)cqr->data;
5297         psf_cuir->order = PSF_ORDER_CUIR_RESPONSE;
5298         psf_cuir->cc = response;
5299         psf_cuir->chpid = device->path[pos].chpid;
5300         psf_cuir->message_id = message_id;
5301         psf_cuir->cssid = device->path[pos].cssid;
5302         psf_cuir->ssid = device->path[pos].ssid;
5303         ccw = cqr->cpaddr;
5304         ccw->cmd_code = DASD_ECKD_CCW_PSF;
5305         ccw->cda = (__u32)(addr_t)psf_cuir;
5306         ccw->flags = CCW_FLAG_SLI;
5307         ccw->count = sizeof(struct dasd_psf_cuir_response);
5308
5309         cqr->startdev = device;
5310         cqr->memdev = device;
5311         cqr->block = NULL;
5312         cqr->retries = 256;
5313         cqr->expires = 10*HZ;
5314         cqr->buildclk = get_tod_clock();
5315         cqr->status = DASD_CQR_FILLED;
5316         set_bit(DASD_CQR_VERIFY_PATH, &cqr->flags);
5317
5318         rc = dasd_sleep_on(cqr);
5319
5320         dasd_sfree_request(cqr, cqr->memdev);
5321         return rc;
5322 }
5323
5324 /*
5325  * return configuration data that is referenced by record selector
5326  * if a record selector is specified or per default return the
5327  * conf_data pointer for the path specified by lpum
5328  */
5329 static struct dasd_conf_data *dasd_eckd_get_ref_conf(struct dasd_device *device,
5330                                                      __u8 lpum,
5331                                                      struct dasd_cuir_message *cuir)
5332 {
5333         struct dasd_conf_data *conf_data;
5334         int path, pos;
5335
5336         if (cuir->record_selector == 0)
5337                 goto out;
5338         for (path = 0x80, pos = 0; path; path >>= 1, pos++) {
5339                 conf_data = device->path[pos].conf_data;
5340                 if (conf_data->gneq.record_selector ==
5341                     cuir->record_selector)
5342                         return conf_data;
5343         }
5344 out:
5345         return device->path[pathmask_to_pos(lpum)].conf_data;
5346 }
5347
5348 /*
5349  * This function determines the scope of a reconfiguration request by
5350  * analysing the path and device selection data provided in the CUIR request.
5351  * Returns a path mask containing CUIR affected paths for the give device.
5352  *
5353  * If the CUIR request does not contain the required information return the
5354  * path mask of the path the attention message for the CUIR request was reveived
5355  * on.
5356  */
5357 static int dasd_eckd_cuir_scope(struct dasd_device *device, __u8 lpum,
5358                                 struct dasd_cuir_message *cuir)
5359 {
5360         struct dasd_conf_data *ref_conf_data;
5361         unsigned long bitmask = 0, mask = 0;
5362         struct dasd_conf_data *conf_data;
5363         unsigned int pos, path;
5364         char *ref_gneq, *gneq;
5365         char *ref_ned, *ned;
5366         int tbcpm = 0;
5367
5368         /* if CUIR request does not specify the scope use the path
5369            the attention message was presented on */
5370         if (!cuir->ned_map ||
5371             !(cuir->neq_map[0] | cuir->neq_map[1] | cuir->neq_map[2]))
5372                 return lpum;
5373
5374         /* get reference conf data */
5375         ref_conf_data = dasd_eckd_get_ref_conf(device, lpum, cuir);
5376         /* reference ned is determined by ned_map field */
5377         pos = 8 - ffs(cuir->ned_map);
5378         ref_ned = (char *)&ref_conf_data->neds[pos];
5379         ref_gneq = (char *)&ref_conf_data->gneq;
5380         /* transfer 24 bit neq_map to mask */
5381         mask = cuir->neq_map[2];
5382         mask |= cuir->neq_map[1] << 8;
5383         mask |= cuir->neq_map[0] << 16;
5384
5385         for (path = 0; path < 8; path++) {
5386                 /* initialise data per path */
5387                 bitmask = mask;
5388                 conf_data = device->path[path].conf_data;
5389                 pos = 8 - ffs(cuir->ned_map);
5390                 ned = (char *) &conf_data->neds[pos];
5391                 /* compare reference ned and per path ned */
5392                 if (memcmp(ref_ned, ned, sizeof(*ned)) != 0)
5393                         continue;
5394                 gneq = (char *)&conf_data->gneq;
5395                 /* compare reference gneq and per_path gneq under
5396                    24 bit mask where mask bit 0 equals byte 7 of
5397                    the gneq and mask bit 24 equals byte 31 */
5398                 while (bitmask) {
5399                         pos = ffs(bitmask) - 1;
5400                         if (memcmp(&ref_gneq[31 - pos], &gneq[31 - pos], 1)
5401                             != 0)
5402                                 break;
5403                         clear_bit(pos, &bitmask);
5404                 }
5405                 if (bitmask)
5406                         continue;
5407                 /* device and path match the reference values
5408                    add path to CUIR scope */
5409                 tbcpm |= 0x80 >> path;
5410         }
5411         return tbcpm;
5412 }
5413
5414 static void dasd_eckd_cuir_notify_user(struct dasd_device *device,
5415                                        unsigned long paths, int action)
5416 {
5417         int pos;
5418
5419         while (paths) {
5420                 /* get position of bit in mask */
5421                 pos = 8 - ffs(paths);
5422                 /* get channel path descriptor from this position */
5423                 if (action == CUIR_QUIESCE)
5424                         pr_warn("Service on the storage server caused path %x.%02x to go offline",
5425                                 device->path[pos].cssid,
5426                                 device->path[pos].chpid);
5427                 else if (action == CUIR_RESUME)
5428                         pr_info("Path %x.%02x is back online after service on the storage server",
5429                                 device->path[pos].cssid,
5430                                 device->path[pos].chpid);
5431                 clear_bit(7 - pos, &paths);
5432         }
5433 }
5434
5435 static int dasd_eckd_cuir_remove_path(struct dasd_device *device, __u8 lpum,
5436                                       struct dasd_cuir_message *cuir)
5437 {
5438         unsigned long tbcpm;
5439
5440         tbcpm = dasd_eckd_cuir_scope(device, lpum, cuir);
5441         /* nothing to do if path is not in use */
5442         if (!(dasd_path_get_opm(device) & tbcpm))
5443                 return 0;
5444         if (!(dasd_path_get_opm(device) & ~tbcpm)) {
5445                 /* no path would be left if the CUIR action is taken
5446                    return error */
5447                 return -EINVAL;
5448         }
5449         /* remove device from operational path mask */
5450         dasd_path_remove_opm(device, tbcpm);
5451         dasd_path_add_cuirpm(device, tbcpm);
5452         return tbcpm;
5453 }
5454
5455 /*
5456  * walk through all devices and build a path mask to quiesce them
5457  * return an error if the last path to a device would be removed
5458  *
5459  * if only part of the devices are quiesced and an error
5460  * occurs no onlining necessary, the storage server will
5461  * notify the already set offline devices again
5462  */
5463 static int dasd_eckd_cuir_quiesce(struct dasd_device *device, __u8 lpum,
5464                                   struct dasd_cuir_message *cuir)
5465 {
5466         struct dasd_eckd_private *private = device->private;
5467         struct alias_pav_group *pavgroup, *tempgroup;
5468         struct dasd_device *dev, *n;
5469         unsigned long paths = 0;
5470         unsigned long flags;
5471         int tbcpm;
5472
5473         /* active devices */
5474         list_for_each_entry_safe(dev, n, &private->lcu->active_devices,
5475                                  alias_list) {
5476                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5477                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5478                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5479                 if (tbcpm < 0)
5480                         goto out_err;
5481                 paths |= tbcpm;
5482         }
5483         /* inactive devices */
5484         list_for_each_entry_safe(dev, n, &private->lcu->inactive_devices,
5485                                  alias_list) {
5486                 spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5487                 tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5488                 spin_unlock_irqrestore(get_ccwdev_lock(dev->cdev), flags);
5489                 if (tbcpm < 0)
5490                         goto out_err;
5491                 paths |= tbcpm;
5492         }
5493         /* devices in PAV groups */
5494         list_for_each_entry_safe(pavgroup, tempgroup,
5495                                  &private->lcu->grouplist, group) {
5496                 list_for_each_entry_safe(dev, n, &pavgroup->baselist,
5497                                          alias_list) {
5498                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5499                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5500                         spin_unlock_irqrestore(
5501                                 get_ccwdev_lock(dev->cdev), flags);
5502                         if (tbcpm < 0)
5503                                 goto out_err;
5504                         paths |= tbcpm;
5505                 }
5506                 list_for_each_entry_safe(dev, n, &pavgroup->aliaslist,
5507                                          alias_list) {
5508                         spin_lock_irqsave(get_ccwdev_lock(dev->cdev), flags);
5509                         tbcpm = dasd_eckd_cuir_remove_path(dev, lpum, cuir);
5510                         spin_unlock_irqrestore(
5511                                 get_ccwdev_lock(dev->cdev), flags);
5512                         if (tbcpm < 0)
5513                                 goto out_err;
5514                         paths |= tbcpm;
5515                 }
5516         }
5517         /* notify user about all paths affected by CUIR action */
5518         dasd_eckd_cuir_notify_user(device, paths, CUIR_QUIESCE);
5519         return 0;
5520 out_err:
5521         return tbcpm;
5522 }
5523
5524 static int dasd_eckd_cuir_resume(struct dasd_device *device, __u8 lpum,
5525                                  struct dasd_cuir_message *cuir)
5526 {
5527         struct dasd_eckd_private *private = device->private;
5528         struct alias_pav_group *pavgroup, *tempgroup;
5529         struct dasd_device *dev, *n;
5530         unsigned long paths = 0;
5531         int tbcpm;
5532
5533         /*
5534          * the path may have been added through a generic path event before
5535          * only trigger path verification if the path is not already in use
5536          */
5537         list_for_each_entry_safe(dev, n,
5538                                  &private->lcu->active_devices,
5539                                  alias_list) {
5540                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5541                 paths |= tbcpm;
5542                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5543                         dasd_path_add_tbvpm(dev, tbcpm);
5544                         dasd_schedule_device_bh(dev);
5545                 }
5546         }
5547         list_for_each_entry_safe(dev, n,
5548                                  &private->lcu->inactive_devices,
5549                                  alias_list) {
5550                 tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5551                 paths |= tbcpm;
5552                 if (!(dasd_path_get_opm(dev) & tbcpm)) {
5553                         dasd_path_add_tbvpm(dev, tbcpm);
5554                         dasd_schedule_device_bh(dev);
5555                 }
5556         }
5557         /* devices in PAV groups */
5558         list_for_each_entry_safe(pavgroup, tempgroup,
5559                                  &private->lcu->grouplist,
5560                                  group) {
5561                 list_for_each_entry_safe(dev, n,
5562                                          &pavgroup->baselist,
5563                                          alias_list) {
5564                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5565                         paths |= tbcpm;
5566                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5567                                 dasd_path_add_tbvpm(dev, tbcpm);
5568                                 dasd_schedule_device_bh(dev);
5569                         }
5570                 }
5571                 list_for_each_entry_safe(dev, n,
5572                                          &pavgroup->aliaslist,
5573                                          alias_list) {
5574                         tbcpm = dasd_eckd_cuir_scope(dev, lpum, cuir);
5575                         paths |= tbcpm;
5576                         if (!(dasd_path_get_opm(dev) & tbcpm)) {
5577                                 dasd_path_add_tbvpm(dev, tbcpm);
5578                                 dasd_schedule_device_bh(dev);
5579                         }
5580                 }
5581         }
5582         /* notify user about all paths affected by CUIR action */
5583         dasd_eckd_cuir_notify_user(device, paths, CUIR_RESUME);
5584         return 0;
5585 }
5586
5587 static void dasd_eckd_handle_cuir(struct dasd_device *device, void *messages,
5588                                  __u8 lpum)
5589 {
5590         struct dasd_cuir_message *cuir = messages;
5591         int response;
5592
5593         DBF_DEV_EVENT(DBF_WARNING, device,
5594                       "CUIR request: %016llx %016llx %016llx %08x",
5595                       ((u64 *)cuir)[0], ((u64 *)cuir)[1], ((u64 *)cuir)[2],
5596                       ((u32 *)cuir)[3]);
5597
5598         if (cuir->code == CUIR_QUIESCE) {
5599                 /* quiesce */
5600                 if (dasd_eckd_cuir_quiesce(device, lpum, cuir))
5601                         response = PSF_CUIR_LAST_PATH;
5602                 else
5603                         response = PSF_CUIR_COMPLETED;
5604         } else if (cuir->code == CUIR_RESUME) {
5605                 /* resume */
5606                 dasd_eckd_cuir_resume(device, lpum, cuir);
5607                 response = PSF_CUIR_COMPLETED;
5608         } else
5609                 response = PSF_CUIR_NOT_SUPPORTED;
5610
5611         dasd_eckd_psf_cuir_response(device, response,
5612                                     cuir->message_id, lpum);
5613         DBF_DEV_EVENT(DBF_WARNING, device,
5614                       "CUIR response: %d on message ID %08x", response,
5615                       cuir->message_id);
5616         /* to make sure there is no attention left schedule work again */
5617         device->discipline->check_attention(device, lpum);
5618 }
5619
5620 static void dasd_eckd_check_attention_work(struct work_struct *work)
5621 {
5622         struct check_attention_work_data *data;
5623         struct dasd_rssd_messages *messages;
5624         struct dasd_device *device;
5625         int rc;
5626
5627         data = container_of(work, struct check_attention_work_data, worker);
5628         device = data->device;
5629         messages = kzalloc(sizeof(*messages), GFP_KERNEL);
5630         if (!messages) {
5631                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5632                               "Could not allocate attention message buffer");
5633                 goto out;
5634         }
5635         rc = dasd_eckd_read_message_buffer(device, messages, data->lpum);
5636         if (rc)
5637                 goto out;
5638         if (messages->length == ATTENTION_LENGTH_CUIR &&
5639             messages->format == ATTENTION_FORMAT_CUIR)
5640                 dasd_eckd_handle_cuir(device, messages, data->lpum);
5641 out:
5642         dasd_put_device(device);
5643         kfree(messages);
5644         kfree(data);
5645 }
5646
5647 static int dasd_eckd_check_attention(struct dasd_device *device, __u8 lpum)
5648 {
5649         struct check_attention_work_data *data;
5650
5651         data = kzalloc(sizeof(*data), GFP_ATOMIC);
5652         if (!data)
5653                 return -ENOMEM;
5654         INIT_WORK(&data->worker, dasd_eckd_check_attention_work);
5655         dasd_get_device(device);
5656         data->device = device;
5657         data->lpum = lpum;
5658         schedule_work(&data->worker);
5659         return 0;
5660 }
5661
5662 static int dasd_eckd_disable_hpf_path(struct dasd_device *device, __u8 lpum)
5663 {
5664         if (~lpum & dasd_path_get_opm(device)) {
5665                 dasd_path_add_nohpfpm(device, lpum);
5666                 dasd_path_remove_opm(device, lpum);
5667                 dev_err(&device->cdev->dev,
5668                         "Channel path %02X lost HPF functionality and is disabled\n",
5669                         lpum);
5670                 return 1;
5671         }
5672         return 0;
5673 }
5674
5675 static void dasd_eckd_disable_hpf_device(struct dasd_device *device)
5676 {
5677         struct dasd_eckd_private *private = device->private;
5678
5679         dev_err(&device->cdev->dev,
5680                 "High Performance FICON disabled\n");
5681         private->fcx_max_data = 0;
5682 }
5683
5684 static int dasd_eckd_hpf_enabled(struct dasd_device *device)
5685 {
5686         struct dasd_eckd_private *private = device->private;
5687
5688         return private->fcx_max_data ? 1 : 0;
5689 }
5690
5691 static void dasd_eckd_handle_hpf_error(struct dasd_device *device,
5692                                        struct irb *irb)
5693 {
5694         struct dasd_eckd_private *private = device->private;
5695
5696         if (!private->fcx_max_data) {
5697                 /* sanity check for no HPF, the error makes no sense */
5698                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
5699                               "Trying to disable HPF for a non HPF device");
5700                 return;
5701         }
5702         if (irb->scsw.tm.sesq == SCSW_SESQ_DEV_NOFCX) {
5703                 dasd_eckd_disable_hpf_device(device);
5704         } else if (irb->scsw.tm.sesq == SCSW_SESQ_PATH_NOFCX) {
5705                 if (dasd_eckd_disable_hpf_path(device, irb->esw.esw1.lpum))
5706                         return;
5707                 dasd_eckd_disable_hpf_device(device);
5708                 dasd_path_set_tbvpm(device,
5709                                   dasd_path_get_hpfpm(device));
5710         }
5711         /*
5712          * prevent that any new I/O ist started on the device and schedule a
5713          * requeue of existing requests
5714          */
5715         dasd_device_set_stop_bits(device, DASD_STOPPED_NOT_ACC);
5716         dasd_schedule_requeue(device);
5717 }
5718
5719 static struct ccw_driver dasd_eckd_driver = {
5720         .driver = {
5721                 .name   = "dasd-eckd",
5722                 .owner  = THIS_MODULE,
5723         },
5724         .ids         = dasd_eckd_ids,
5725         .probe       = dasd_eckd_probe,
5726         .remove      = dasd_generic_remove,
5727         .set_offline = dasd_generic_set_offline,
5728         .set_online  = dasd_eckd_set_online,
5729         .notify      = dasd_generic_notify,
5730         .path_event  = dasd_generic_path_event,
5731         .shutdown    = dasd_generic_shutdown,
5732         .freeze      = dasd_generic_pm_freeze,
5733         .thaw        = dasd_generic_restore_device,
5734         .restore     = dasd_generic_restore_device,
5735         .uc_handler  = dasd_generic_uc_handler,
5736         .int_class   = IRQIO_DAS,
5737 };
5738
5739 /*
5740  * max_blocks is dependent on the amount of storage that is available
5741  * in the static io buffer for each device. Currently each device has
5742  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
5743  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
5744  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
5745  * addition we have one define extent ccw + 16 bytes of data and one
5746  * locate record ccw + 16 bytes of data. That makes:
5747  * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum.
5748  * We want to fit two into the available memory so that we can immediately
5749  * start the next request if one finishes off. That makes 249.5 blocks
5750  * for one request. Give a little safety and the result is 240.
5751  */
5752 static struct dasd_discipline dasd_eckd_discipline = {
5753         .owner = THIS_MODULE,
5754         .name = "ECKD",
5755         .ebcname = "ECKD",
5756         .max_blocks = 190,
5757         .check_device = dasd_eckd_check_characteristics,
5758         .uncheck_device = dasd_eckd_uncheck_device,
5759         .do_analysis = dasd_eckd_do_analysis,
5760         .verify_path = dasd_eckd_verify_path,
5761         .basic_to_ready = dasd_eckd_basic_to_ready,
5762         .online_to_ready = dasd_eckd_online_to_ready,
5763         .basic_to_known = dasd_eckd_basic_to_known,
5764         .fill_geometry = dasd_eckd_fill_geometry,
5765         .start_IO = dasd_start_IO,
5766         .term_IO = dasd_term_IO,
5767         .handle_terminated_request = dasd_eckd_handle_terminated_request,
5768         .format_device = dasd_eckd_format_device,
5769         .check_device_format = dasd_eckd_check_device_format,
5770         .erp_action = dasd_eckd_erp_action,
5771         .erp_postaction = dasd_eckd_erp_postaction,
5772         .check_for_device_change = dasd_eckd_check_for_device_change,
5773         .build_cp = dasd_eckd_build_alias_cp,
5774         .free_cp = dasd_eckd_free_alias_cp,
5775         .dump_sense = dasd_eckd_dump_sense,
5776         .dump_sense_dbf = dasd_eckd_dump_sense_dbf,
5777         .fill_info = dasd_eckd_fill_info,
5778         .ioctl = dasd_eckd_ioctl,
5779         .freeze = dasd_eckd_pm_freeze,
5780         .restore = dasd_eckd_restore_device,
5781         .reload = dasd_eckd_reload_device,
5782         .get_uid = dasd_eckd_get_uid,
5783         .kick_validate = dasd_eckd_kick_validate_server,
5784         .check_attention = dasd_eckd_check_attention,
5785         .host_access_count = dasd_eckd_host_access_count,
5786         .hosts_print = dasd_hosts_print,
5787         .handle_hpf_error = dasd_eckd_handle_hpf_error,
5788         .disable_hpf = dasd_eckd_disable_hpf_device,
5789         .hpf_enabled = dasd_eckd_hpf_enabled,
5790         .reset_path = dasd_eckd_reset_path,
5791 };
5792
5793 static int __init
5794 dasd_eckd_init(void)
5795 {
5796         int ret;
5797
5798         ASCEBC(dasd_eckd_discipline.ebcname, 4);
5799         dasd_reserve_req = kmalloc(sizeof(*dasd_reserve_req),
5800                                    GFP_KERNEL | GFP_DMA);
5801         if (!dasd_reserve_req)
5802                 return -ENOMEM;
5803         path_verification_worker = kmalloc(sizeof(*path_verification_worker),
5804                                    GFP_KERNEL | GFP_DMA);
5805         if (!path_verification_worker) {
5806                 kfree(dasd_reserve_req);
5807                 return -ENOMEM;
5808         }
5809         rawpadpage = (void *)__get_free_page(GFP_KERNEL);
5810         if (!rawpadpage) {
5811                 kfree(path_verification_worker);
5812                 kfree(dasd_reserve_req);
5813                 return -ENOMEM;
5814         }
5815         ret = ccw_driver_register(&dasd_eckd_driver);
5816         if (!ret)
5817                 wait_for_device_probe();
5818         else {
5819                 kfree(path_verification_worker);
5820                 kfree(dasd_reserve_req);
5821                 free_page((unsigned long)rawpadpage);
5822         }
5823         return ret;
5824 }
5825
5826 static void __exit
5827 dasd_eckd_cleanup(void)
5828 {
5829         ccw_driver_unregister(&dasd_eckd_driver);
5830         kfree(path_verification_worker);
5831         kfree(dasd_reserve_req);
5832         free_page((unsigned long)rawpadpage);
5833 }
5834
5835 module_init(dasd_eckd_init);
5836 module_exit(dasd_eckd_cleanup);