drivers/s390/block/dasd_fba.c

   1 /*
   2  * File...........: linux/drivers/s390/block/dasd_fba.c
   3  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
   4  * Bugreports.to..: <Linux390@de.ibm.com>
   5  * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999,2000
   6  *
   7  */
   8
   9 #include <linux/config.h>
  10 #include <linux/stddef.h>
  11 #include <linux/kernel.h>
  12 #include <asm/debug.h>
  13
  14 #include <linux/slab.h>
  15 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  16 #include <linux/bio.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19
  20 #include <asm/idals.h>
  21 #include <asm/ebcdic.h>
  22 #include <asm/io.h>
  23 #include <asm/todclk.h>
  24 #include <asm/ccwdev.h>
  25
  26 #include "dasd_int.h"
  27 #include "dasd_fba.h"
  28
  29 #ifdef PRINTK_HEADER
  30 #undef PRINTK_HEADER
  31 #endif                          /* PRINTK_HEADER */
  32 #define PRINTK_HEADER "dasd(fba):"
  33
  34 #define DASD_FBA_CCW_WRITE 0x41
  35 #define DASD_FBA_CCW_READ 0x42
  36 #define DASD_FBA_CCW_LOCATE 0x43
  37 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  38
  39 MODULE_LICENSE("GPL");
  40
  41 static struct dasd_discipline dasd_fba_discipline;
  42
  43 struct dasd_fba_private {
  44         struct dasd_fba_characteristics rdc_data;
  45 };
  46
  47 static struct ccw_device_id dasd_fba_ids[] = {
  48         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
  49         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
  50         { /* end of list */ },
  51 };
  52
  53 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  54
  55 static struct ccw_driver dasd_fba_driver; /* see below */
  56 static int
  57 dasd_fba_probe(struct ccw_device *cdev)
  58 {
  59         return dasd_generic_probe(cdev, &dasd_fba_discipline);
  60 }
  61
  62 static int
  63 dasd_fba_set_online(struct ccw_device *cdev)
  64 {
  65         return dasd_generic_set_online(cdev, &dasd_fba_discipline);
  66 }
  67
  68 static struct ccw_driver dasd_fba_driver = {
  69         .name        = "dasd-fba",
  70         .owner       = THIS_MODULE,
  71         .ids         = dasd_fba_ids,
  72         .probe       = dasd_fba_probe,
  73         .remove      = dasd_generic_remove,
  74         .set_offline = dasd_generic_set_offline,
  75         .set_online  = dasd_fba_set_online,
  76         .notify      = dasd_generic_notify,
  77 };
  78
  79 static inline void
  80 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  81               int blksize, int beg, int nr)
  82 {
  83         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  84         ccw->flags = 0;
  85         ccw->count = 16;
  86         ccw->cda = (__u32) __pa(data);
  87         memset(data, 0, sizeof (struct DE_fba_data));
  88         if (rw == WRITE)
  89                 (data->mask).perm = 0x0;
  90         else if (rw == READ)
  91                 (data->mask).perm = 0x1;
  92         else
  93                 data->mask.perm = 0x2;
  94         data->blk_size = blksize;
  95         data->ext_loc = beg;
  96         data->ext_end = nr - 1;
  97 }
  98
  99 static inline void
 100 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 101               int block_nr, int block_ct)
 102 {
 103         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 104         ccw->flags = 0;
 105         ccw->count = 8;
 106         ccw->cda = (__u32) __pa(data);
 107         memset(data, 0, sizeof (struct LO_fba_data));
 108         if (rw == WRITE)
 109                 data->operation.cmd = 0x5;
 110         else if (rw == READ)
 111                 data->operation.cmd = 0x6;
 112         else
 113                 data->operation.cmd = 0x8;
 114         data->blk_nr = block_nr;
 115         data->blk_ct = block_ct;
 116 }
 117
 118 static int
 119 dasd_fba_check_characteristics(struct dasd_device *device)
 120 {
 121         struct dasd_fba_private *private;
 122         struct ccw_device *cdev = device->cdev;
 123         void *rdc_data;
 124         int rc;
 125
 126         private = (struct dasd_fba_private *) device->private;
 127         if (private == NULL) {
 128                 private = kzalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
 129                 if (private == NULL) {
 130                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 131                                     "memory allocation failed for private "
 132                                     "data");
 133                         return -ENOMEM;
 134                 }
 135                 device->private = (void *) private;
 136         }
 137         /* Read Device Characteristics */
 138         rdc_data = (void *) &(private->rdc_data);
 139         rc = read_dev_chars(device->cdev, &rdc_data, 32);
 140         if (rc) {
 141                 DEV_MESSAGE(KERN_WARNING, device,
 142                             "Read device characteristics returned error %d",
 143                             rc);
 144                 return rc;
 145         }
 146
 147         DEV_MESSAGE(KERN_INFO, device,
 148                     "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
 149                     cdev->id.dev_type,
 150                     cdev->id.dev_model,
 151                     cdev->id.cu_type,
 152                     cdev->id.cu_model,
 153                     ((private->rdc_data.blk_bdsa *
 154                       (private->rdc_data.blk_size >> 9)) >> 11),
 155                     private->rdc_data.blk_size);
 156         return 0;
 157 }
 158
 159 static int
 160 dasd_fba_do_analysis(struct dasd_device *device)
 161 {
 162         struct dasd_fba_private *private;
 163         int sb, rc;
 164
 165         private = (struct dasd_fba_private *) device->private;
 166         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 167         if (rc) {
 168                 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
 169                             private->rdc_data.blk_size);
 170                 return rc;
 171         }
 172         device->blocks = private->rdc_data.blk_bdsa;
 173         device->bp_block = private->rdc_data.blk_size;
 174         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 175         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 176                 device->s2b_shift++;
 177         return 0;
 178 }
 179
 180 static int
 181 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 182 {
 183         if (dasd_check_blocksize(device->bp_block) != 0)
 184                 return -EINVAL;
 185         geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
 186         geo->heads = 16;
 187         geo->sectors = 128 >> device->s2b_shift;
 188         return 0;
 189 }
 190
 191 static dasd_era_t
 192 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
 193 {
 194         struct dasd_device *device;
 195         struct ccw_device *cdev;
 196
 197         device = (struct dasd_device *) cqr->device;
 198         if (irb->scsw.cstat == 0x00 &&
 199             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 200                 return dasd_era_none;
 201
 202         cdev = device->cdev;
 203         switch (cdev->id.dev_type) {
 204         case 0x3370:
 205                 return dasd_3370_erp_examine(cqr, irb);
 206         case 0x9336:
 207                 return dasd_9336_erp_examine(cqr, irb);
 208         default:
 209                 return dasd_era_recover;
 210         }
 211 }
 212
 213 static dasd_erp_fn_t
 214 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 215 {
 216         return dasd_default_erp_action;
 217 }
 218
 219 static dasd_erp_fn_t
 220 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 221 {
 222         if (cqr->function == dasd_default_erp_action)
 223                 return dasd_default_erp_postaction;
 224
 225         DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
 226                     cqr->function);
 227         return NULL;
 228 }
 229
 230 static struct dasd_ccw_req *
 231 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
 232 {
 233         struct dasd_fba_private *private;
 234         unsigned long *idaws;
 235         struct LO_fba_data *LO_data;
 236         struct dasd_ccw_req *cqr;
 237         struct ccw1 *ccw;
 238         struct bio *bio;
 239         struct bio_vec *bv;
 240         char *dst;
 241         int count, cidaw, cplength, datasize;
 242         sector_t recid, first_rec, last_rec;
 243         unsigned int blksize, off;
 244         unsigned char cmd;
 245         int i;
 246
 247         private = (struct dasd_fba_private *) device->private;
 248         if (rq_data_dir(req) == READ) {
 249                 cmd = DASD_FBA_CCW_READ;
 250         } else if (rq_data_dir(req) == WRITE) {
 251                 cmd = DASD_FBA_CCW_WRITE;
 252         } else
 253                 return ERR_PTR(-EINVAL);
 254         blksize = device->bp_block;
 255         /* Calculate record id of first and last block. */
 256         first_rec = req->sector >> device->s2b_shift;
 257         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
 258         /* Check struct bio and count the number of blocks for the request. */
 259         count = 0;
 260         cidaw = 0;
 261         rq_for_each_bio(bio, req) {
 262                 bio_for_each_segment(bv, bio, i) {
 263                         if (bv->bv_len & (blksize - 1))
 264                                 /* Fba can only do full blocks. */
 265                                 return ERR_PTR(-EINVAL);
 266                         count += bv->bv_len >> (device->s2b_shift + 9);
 267 #if defined(CONFIG_64BIT)
 268                         if (idal_is_needed (page_address(bv->bv_page),
 269                                             bv->bv_len))
 270                                 cidaw += bv->bv_len / blksize;
 271 #endif
 272                 }
 273         }
 274         /* Paranoia. */
 275         if (count != last_rec - first_rec + 1)
 276                 return ERR_PTR(-EINVAL);
 277         /* 1x define extent + 1x locate record + number of blocks */
 278         cplength = 2 + count;
 279         /* 1x define extent + 1x locate record */
 280         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 281                 cidaw * sizeof(unsigned long);
 282         /*
 283          * Find out number of additional locate record ccws if the device
 284          * can't do data chaining.
 285          */
 286         if (private->rdc_data.mode.bits.data_chain == 0) {
 287                 cplength += count - 1;
 288                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 289         }
 290         /* Allocate the ccw request. */
 291         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 292                                    cplength, datasize, device);
 293         if (IS_ERR(cqr))
 294                 return cqr;
 295         ccw = cqr->cpaddr;
 296         /* First ccw is define extent. */
 297         define_extent(ccw++, cqr->data, rq_data_dir(req),
 298                       device->bp_block, req->sector, req->nr_sectors);
 299         /* Build locate_record + read/write ccws. */
 300         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 301         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 302         /* Locate record for all blocks for smart devices. */
 303         if (private->rdc_data.mode.bits.data_chain != 0) {
 304                 ccw[-1].flags |= CCW_FLAG_CC;
 305                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 306         }
 307         recid = first_rec;
 308         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 309                 dst = page_address(bv->bv_page) + bv->bv_offset;
 310                 if (dasd_page_cache) {
 311                         char *copy = kmem_cache_alloc(dasd_page_cache,
 312                                                       SLAB_DMA | __GFP_NOWARN);
 313                         if (copy && rq_data_dir(req) == WRITE)
 314                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
 315                         if (copy)
 316                                 dst = copy + bv->bv_offset;
 317                 }
 318                 for (off = 0; off < bv->bv_len; off += blksize) {
 319                         /* Locate record for stupid devices. */
 320                         if (private->rdc_data.mode.bits.data_chain == 0) {
 321                                 ccw[-1].flags |= CCW_FLAG_CC;
 322                                 locate_record(ccw, LO_data++,
 323                                               rq_data_dir(req),
 324                                               recid - first_rec, 1);
 325                                 ccw->flags = CCW_FLAG_CC;
 326                                 ccw++;
 327                         } else {
 328                                 if (recid > first_rec)
 329                                         ccw[-1].flags |= CCW_FLAG_DC;
 330                                 else
 331                                         ccw[-1].flags |= CCW_FLAG_CC;
 332                         }
 333                         ccw->cmd_code = cmd;
 334                         ccw->count = device->bp_block;
 335                         if (idal_is_needed(dst, blksize)) {
 336                                 ccw->cda = (__u32)(addr_t) idaws;
 337                                 ccw->flags = CCW_FLAG_IDA;
 338                                 idaws = idal_create_words(idaws, dst, blksize);
 339                         } else {
 340                                 ccw->cda = (__u32)(addr_t) dst;
 341                                 ccw->flags = 0;
 342                         }
 343                         ccw++;
 344                         dst += blksize;
 345                         recid++;
 346                 }
 347         }
 348         if (req->flags & REQ_FAILFAST)
 349                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 350         cqr->device = device;
 351         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
 352         cqr->retries = 32;
 353         cqr->buildclk = get_clock();
 354         cqr->status = DASD_CQR_FILLED;
 355         return cqr;
 356 }
 357
 358 static int
 359 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 360 {
 361         struct dasd_fba_private *private;
 362         struct ccw1 *ccw;
 363         struct bio *bio;
 364         struct bio_vec *bv;
 365         char *dst, *cda;
 366         unsigned int blksize, off;
 367         int i, status;
 368
 369         if (!dasd_page_cache)
 370                 goto out;
 371         private = (struct dasd_fba_private *) cqr->device->private;
 372         blksize = cqr->device->bp_block;
 373         ccw = cqr->cpaddr;
 374         /* Skip over define extent & locate record. */
 375         ccw++;
 376         if (private->rdc_data.mode.bits.data_chain != 0)
 377                 ccw++;
 378         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 379                 dst = page_address(bv->bv_page) + bv->bv_offset;
 380                 for (off = 0; off < bv->bv_len; off += blksize) {
 381                         /* Skip locate record. */
 382                         if (private->rdc_data.mode.bits.data_chain == 0)
 383                                 ccw++;
 384                         if (dst) {
 385                                 if (ccw->flags & CCW_FLAG_IDA)
 386                                         cda = *((char **)((addr_t) ccw->cda));
 387                                 else
 388                                         cda = (char *)((addr_t) ccw->cda);
 389                                 if (dst != cda) {
 390                                         if (rq_data_dir(req) == READ)
 391                                                 memcpy(dst, cda, bv->bv_len);
 392                                         kmem_cache_free(dasd_page_cache,
 393                                             (void *)((addr_t)cda & PAGE_MASK));
 394                                 }
 395                                 dst = NULL;
 396                         }
 397                         ccw++;
 398                 }
 399         }
 400 out:
 401         status = cqr->status == DASD_CQR_DONE;
 402         dasd_sfree_request(cqr, cqr->device);
 403         return status;
 404 }
 405
 406 static int
 407 dasd_fba_fill_info(struct dasd_device * device,
 408                    struct dasd_information2_t * info)
 409 {
 410         info->label_block = 1;
 411         info->FBA_layout = 1;
 412         info->format = DASD_FORMAT_LDL;
 413         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 414         memcpy(info->characteristics,
 415                &((struct dasd_fba_private *) device->private)->rdc_data,
 416                sizeof (struct dasd_fba_characteristics));
 417         info->confdata_size = 0;
 418         return 0;
 419 }
 420
 421 static void
 422 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 423                     struct irb *irb)
 424 {
 425         char *page;
 426         struct ccw1 *act, *end, *last;
 427         int len, sl, sct, count;
 428
 429         page = (char *) get_zeroed_page(GFP_ATOMIC);
 430         if (page == NULL) {
 431                 DEV_MESSAGE(KERN_ERR, device, " %s",
 432                             "No memory to dump sense data");
 433                 return;
 434         }
 435         len = sprintf(page, KERN_ERR PRINTK_HEADER
 436                       " I/O status report for device %s:\n",
 437                       device->cdev->dev.bus_id);
 438         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 439                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 440                        irb->scsw.cstat, irb->scsw.dstat);
 441         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 442                        " device %s: Failing CCW: %p\n",
 443                        device->cdev->dev.bus_id,
 444                        (void *) (addr_t) irb->scsw.cpa);
 445         if (irb->esw.esw0.erw.cons) {
 446                 for (sl = 0; sl < 4; sl++) {
 447                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 448                                        " Sense(hex) %2d-%2d:",
 449                                        (8 * sl), ((8 * sl) + 7));
 450
 451                         for (sct = 0; sct < 8; sct++) {
 452                                 len += sprintf(page + len, " %02x",
 453                                                irb->ecw[8 * sl + sct]);
 454                         }
 455                         len += sprintf(page + len, "\n");
 456                 }
 457         } else {
 458                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 459                                " SORRY - NO VALID SENSE AVAILABLE\n");
 460         }
 461         MESSAGE_LOG(KERN_ERR, "%s",
 462                     page + sizeof(KERN_ERR PRINTK_HEADER));
 463
 464         /* dump the Channel Program */
 465         /* print first CCWs (maximum 8) */
 466         act = req->cpaddr;
 467         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 468         end = min(act + 8, last);
 469         len = sprintf(page, KERN_ERR PRINTK_HEADER
 470                       " Related CP in req: %p\n", req);
 471         while (act <= end) {
 472                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 473                                " CCW %p: %08X %08X DAT:",
 474                                act, ((int *) act)[0], ((int *) act)[1]);
 475                 for (count = 0; count < 32 && count < act->count;
 476                      count += sizeof(int))
 477                         len += sprintf(page + len, " %08X",
 478                                        ((int *) (addr_t) act->cda)
 479                                        [(count>>2)]);
 480                 len += sprintf(page + len, "\n");
 481                 act++;
 482         }
 483         MESSAGE_LOG(KERN_ERR, "%s",
 484                     page + sizeof(KERN_ERR PRINTK_HEADER));
 485
 486
 487         /* print failing CCW area */
 488         len = 0;
 489         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
 490                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
 491                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 492         }
 493         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
 494         while (act <= end) {
 495                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 496                                " CCW %p: %08X %08X DAT:",
 497                                act, ((int *) act)[0], ((int *) act)[1]);
 498                 for (count = 0; count < 32 && count < act->count;
 499                      count += sizeof(int))
 500                         len += sprintf(page + len, " %08X",
 501                                        ((int *) (addr_t) act->cda)
 502                                        [(count>>2)]);
 503                 len += sprintf(page + len, "\n");
 504                 act++;
 505         }
 506
 507         /* print last CCWs */
 508         if (act <  last - 2) {
 509                 act = last - 2;
 510                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 511         }
 512         while (act <= last) {
 513                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 514                                " CCW %p: %08X %08X DAT:",
 515                                act, ((int *) act)[0], ((int *) act)[1]);
 516                 for (count = 0; count < 32 && count < act->count;
 517                      count += sizeof(int))
 518                         len += sprintf(page + len, " %08X",
 519                                        ((int *) (addr_t) act->cda)
 520                                        [(count>>2)]);
 521                 len += sprintf(page + len, "\n");
 522                 act++;
 523         }
 524         if (len > 0)
 525                 MESSAGE_LOG(KERN_ERR, "%s",
 526                             page + sizeof(KERN_ERR PRINTK_HEADER));
 527         free_page((unsigned long) page);
 528 }
 529
 530 /*
 531  * max_blocks is dependent on the amount of storage that is available
 532  * in the static io buffer for each device. Currently each device has
 533  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 534  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 535  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 536  * addition we have one define extent ccw + 16 bytes of data and a
 537  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 538  * That makes:
 539  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 540  * We want to fit two into the available memory so that we can immediately
 541  * start the next request if one finishes off. That makes 100.1 blocks
 542  * for one request. Give a little safety and the result is 96.
 543  */
 544 static struct dasd_discipline dasd_fba_discipline = {
 545         .owner = THIS_MODULE,
 546         .name = "FBA ",
 547         .ebcname = "FBA ",
 548         .max_blocks = 96,
 549         .check_device = dasd_fba_check_characteristics,
 550         .do_analysis = dasd_fba_do_analysis,
 551         .fill_geometry = dasd_fba_fill_geometry,
 552         .start_IO = dasd_start_IO,
 553         .term_IO = dasd_term_IO,
 554         .examine_error = dasd_fba_examine_error,
 555         .erp_action = dasd_fba_erp_action,
 556         .erp_postaction = dasd_fba_erp_postaction,
 557         .build_cp = dasd_fba_build_cp,
 558         .free_cp = dasd_fba_free_cp,
 559         .dump_sense = dasd_fba_dump_sense,
 560         .fill_info = dasd_fba_fill_info,
 561 };
 562
 563 static int __init
 564 dasd_fba_init(void)
 565 {
 566         ASCEBC(dasd_fba_discipline.ebcname, 4);
 567         return ccw_driver_register(&dasd_fba_driver);
 568 }
 569
 570 static void __exit
 571 dasd_fba_cleanup(void)
 572 {
 573         ccw_driver_unregister(&dasd_fba_driver);
 574 }
 575
 576 module_init(dasd_fba_init);
 577 module_exit(dasd_fba_cleanup);