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