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 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 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 = dasd_generic_read_dev_chars(device, "FBA ", &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 req_iterator iter;
 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
 245         private = (struct dasd_fba_private *) device->private;
 246         if (rq_data_dir(req) == READ) {
 247                 cmd = DASD_FBA_CCW_READ;
 248         } else if (rq_data_dir(req) == WRITE) {
 249                 cmd = DASD_FBA_CCW_WRITE;
 250         } else
 251                 return ERR_PTR(-EINVAL);
 252         blksize = device->bp_block;
 253         /* Calculate record id of first and last block. */
 254         first_rec = req->sector >> device->s2b_shift;
 255         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
 256         /* Check struct bio and count the number of blocks for the request. */
 257         count = 0;
 258         cidaw = 0;
 259         rq_for_each_segment(bv, req, iter) {
 260                 if (bv->bv_len & (blksize - 1))
 261                         /* Fba can only do full blocks. */
 262                         return ERR_PTR(-EINVAL);
 263                 count += bv->bv_len >> (device->s2b_shift + 9);
 264 #if defined(CONFIG_64BIT)
 265                 if (idal_is_needed (page_address(bv->bv_page), bv->bv_len))
 266                         cidaw += bv->bv_len / blksize;
 267 #endif
 268         }
 269         /* Paranoia. */
 270         if (count != last_rec - first_rec + 1)
 271                 return ERR_PTR(-EINVAL);
 272         /* 1x define extent + 1x locate record + number of blocks */
 273         cplength = 2 + count;
 274         /* 1x define extent + 1x locate record */
 275         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 276                 cidaw * sizeof(unsigned long);
 277         /*
 278          * Find out number of additional locate record ccws if the device
 279          * can't do data chaining.
 280          */
 281         if (private->rdc_data.mode.bits.data_chain == 0) {
 282                 cplength += count - 1;
 283                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 284         }
 285         /* Allocate the ccw request. */
 286         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 287                                    cplength, datasize, device);
 288         if (IS_ERR(cqr))
 289                 return cqr;
 290         ccw = cqr->cpaddr;
 291         /* First ccw is define extent. */
 292         define_extent(ccw++, cqr->data, rq_data_dir(req),
 293                       device->bp_block, req->sector, req->nr_sectors);
 294         /* Build locate_record + read/write ccws. */
 295         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 296         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 297         /* Locate record for all blocks for smart devices. */
 298         if (private->rdc_data.mode.bits.data_chain != 0) {
 299                 ccw[-1].flags |= CCW_FLAG_CC;
 300                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 301         }
 302         recid = first_rec;
 303         rq_for_each_segment(bv, req, iter) {
 304                 dst = page_address(bv->bv_page) + bv->bv_offset;
 305                 if (dasd_page_cache) {
 306                         char *copy = kmem_cache_alloc(dasd_page_cache,
 307                                                       GFP_DMA | __GFP_NOWARN);
 308                         if (copy && rq_data_dir(req) == WRITE)
 309                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
 310                         if (copy)
 311                                 dst = copy + bv->bv_offset;
 312                 }
 313                 for (off = 0; off < bv->bv_len; off += blksize) {
 314                         /* Locate record for stupid devices. */
 315                         if (private->rdc_data.mode.bits.data_chain == 0) {
 316                                 ccw[-1].flags |= CCW_FLAG_CC;
 317                                 locate_record(ccw, LO_data++,
 318                                               rq_data_dir(req),
 319                                               recid - first_rec, 1);
 320                                 ccw->flags = CCW_FLAG_CC;
 321                                 ccw++;
 322                         } else {
 323                                 if (recid > first_rec)
 324                                         ccw[-1].flags |= CCW_FLAG_DC;
 325                                 else
 326                                         ccw[-1].flags |= CCW_FLAG_CC;
 327                         }
 328                         ccw->cmd_code = cmd;
 329                         ccw->count = device->bp_block;
 330                         if (idal_is_needed(dst, blksize)) {
 331                                 ccw->cda = (__u32)(addr_t) idaws;
 332                                 ccw->flags = CCW_FLAG_IDA;
 333                                 idaws = idal_create_words(idaws, dst, blksize);
 334                         } else {
 335                                 ccw->cda = (__u32)(addr_t) dst;
 336                                 ccw->flags = 0;
 337                         }
 338                         ccw++;
 339                         dst += blksize;
 340                         recid++;
 341                 }
 342         }
 343         if (req->cmd_flags & REQ_FAILFAST)
 344                 set_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags);
 345         cqr->device = device;
 346         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
 347         cqr->retries = 32;
 348         cqr->buildclk = get_clock();
 349         cqr->status = DASD_CQR_FILLED;
 350         return cqr;
 351 }
 352
 353 static int
 354 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 355 {
 356         struct dasd_fba_private *private;
 357         struct ccw1 *ccw;
 358         struct req_iterator iter;
 359         struct bio_vec *bv;
 360         char *dst, *cda;
 361         unsigned int blksize, off;
 362         int status;
 363
 364         if (!dasd_page_cache)
 365                 goto out;
 366         private = (struct dasd_fba_private *) cqr->device->private;
 367         blksize = cqr->device->bp_block;
 368         ccw = cqr->cpaddr;
 369         /* Skip over define extent & locate record. */
 370         ccw++;
 371         if (private->rdc_data.mode.bits.data_chain != 0)
 372                 ccw++;
 373         rq_for_each_segment(bv, req, iter) {
 374                 dst = page_address(bv->bv_page) + bv->bv_offset;
 375                 for (off = 0; off < bv->bv_len; off += blksize) {
 376                         /* Skip locate record. */
 377                         if (private->rdc_data.mode.bits.data_chain == 0)
 378                                 ccw++;
 379                         if (dst) {
 380                                 if (ccw->flags & CCW_FLAG_IDA)
 381                                         cda = *((char **)((addr_t) ccw->cda));
 382                                 else
 383                                         cda = (char *)((addr_t) ccw->cda);
 384                                 if (dst != cda) {
 385                                         if (rq_data_dir(req) == READ)
 386                                                 memcpy(dst, cda, bv->bv_len);
 387                                         kmem_cache_free(dasd_page_cache,
 388                                             (void *)((addr_t)cda & PAGE_MASK));
 389                                 }
 390                                 dst = NULL;
 391                         }
 392                         ccw++;
 393                 }
 394         }
 395 out:
 396         status = cqr->status == DASD_CQR_DONE;
 397         dasd_sfree_request(cqr, cqr->device);
 398         return status;
 399 }
 400
 401 static int
 402 dasd_fba_fill_info(struct dasd_device * device,
 403                    struct dasd_information2_t * info)
 404 {
 405         info->label_block = 1;
 406         info->FBA_layout = 1;
 407         info->format = DASD_FORMAT_LDL;
 408         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 409         memcpy(info->characteristics,
 410                &((struct dasd_fba_private *) device->private)->rdc_data,
 411                sizeof (struct dasd_fba_characteristics));
 412         info->confdata_size = 0;
 413         return 0;
 414 }
 415
 416 static void
 417 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 418                     struct irb *irb)
 419 {
 420         char *page;
 421         struct ccw1 *act, *end, *last;
 422         int len, sl, sct, count;
 423
 424         page = (char *) get_zeroed_page(GFP_ATOMIC);
 425         if (page == NULL) {
 426                 DEV_MESSAGE(KERN_ERR, device, " %s",
 427                             "No memory to dump sense data");
 428                 return;
 429         }
 430         len = sprintf(page, KERN_ERR PRINTK_HEADER
 431                       " I/O status report for device %s:\n",
 432                       device->cdev->dev.bus_id);
 433         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 434                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 435                        irb->scsw.cstat, irb->scsw.dstat);
 436         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 437                        " device %s: Failing CCW: %p\n",
 438                        device->cdev->dev.bus_id,
 439                        (void *) (addr_t) irb->scsw.cpa);
 440         if (irb->esw.esw0.erw.cons) {
 441                 for (sl = 0; sl < 4; sl++) {
 442                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 443                                        " Sense(hex) %2d-%2d:",
 444                                        (8 * sl), ((8 * sl) + 7));
 445
 446                         for (sct = 0; sct < 8; sct++) {
 447                                 len += sprintf(page + len, " %02x",
 448                                                irb->ecw[8 * sl + sct]);
 449                         }
 450                         len += sprintf(page + len, "\n");
 451                 }
 452         } else {
 453                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 454                                " SORRY - NO VALID SENSE AVAILABLE\n");
 455         }
 456         MESSAGE_LOG(KERN_ERR, "%s",
 457                     page + sizeof(KERN_ERR PRINTK_HEADER));
 458
 459         /* dump the Channel Program */
 460         /* print first CCWs (maximum 8) */
 461         act = req->cpaddr;
 462         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 463         end = min(act + 8, last);
 464         len = sprintf(page, KERN_ERR PRINTK_HEADER
 465                       " Related CP in req: %p\n", req);
 466         while (act <= end) {
 467                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 468                                " CCW %p: %08X %08X DAT:",
 469                                act, ((int *) act)[0], ((int *) act)[1]);
 470                 for (count = 0; count < 32 && count < act->count;
 471                      count += sizeof(int))
 472                         len += sprintf(page + len, " %08X",
 473                                        ((int *) (addr_t) act->cda)
 474                                        [(count>>2)]);
 475                 len += sprintf(page + len, "\n");
 476                 act++;
 477         }
 478         MESSAGE_LOG(KERN_ERR, "%s",
 479                     page + sizeof(KERN_ERR PRINTK_HEADER));
 480
 481
 482         /* print failing CCW area */
 483         len = 0;
 484         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
 485                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
 486                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 487         }
 488         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
 489         while (act <= end) {
 490                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 491                                " CCW %p: %08X %08X DAT:",
 492                                act, ((int *) act)[0], ((int *) act)[1]);
 493                 for (count = 0; count < 32 && count < act->count;
 494                      count += sizeof(int))
 495                         len += sprintf(page + len, " %08X",
 496                                        ((int *) (addr_t) act->cda)
 497                                        [(count>>2)]);
 498                 len += sprintf(page + len, "\n");
 499                 act++;
 500         }
 501
 502         /* print last CCWs */
 503         if (act <  last - 2) {
 504                 act = last - 2;
 505                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 506         }
 507         while (act <= last) {
 508                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 509                                " CCW %p: %08X %08X DAT:",
 510                                act, ((int *) act)[0], ((int *) act)[1]);
 511                 for (count = 0; count < 32 && count < act->count;
 512                      count += sizeof(int))
 513                         len += sprintf(page + len, " %08X",
 514                                        ((int *) (addr_t) act->cda)
 515                                        [(count>>2)]);
 516                 len += sprintf(page + len, "\n");
 517                 act++;
 518         }
 519         if (len > 0)
 520                 MESSAGE_LOG(KERN_ERR, "%s",
 521                             page + sizeof(KERN_ERR PRINTK_HEADER));
 522         free_page((unsigned long) page);
 523 }
 524
 525 /*
 526  * max_blocks is dependent on the amount of storage that is available
 527  * in the static io buffer for each device. Currently each device has
 528  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 529  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 530  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 531  * addition we have one define extent ccw + 16 bytes of data and a
 532  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 533  * That makes:
 534  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 535  * We want to fit two into the available memory so that we can immediately
 536  * start the next request if one finishes off. That makes 100.1 blocks
 537  * for one request. Give a little safety and the result is 96.
 538  */
 539 static struct dasd_discipline dasd_fba_discipline = {
 540         .owner = THIS_MODULE,
 541         .name = "FBA ",
 542         .ebcname = "FBA ",
 543         .max_blocks = 96,
 544         .check_device = dasd_fba_check_characteristics,
 545         .do_analysis = dasd_fba_do_analysis,
 546         .fill_geometry = dasd_fba_fill_geometry,
 547         .start_IO = dasd_start_IO,
 548         .term_IO = dasd_term_IO,
 549         .examine_error = dasd_fba_examine_error,
 550         .erp_action = dasd_fba_erp_action,
 551         .erp_postaction = dasd_fba_erp_postaction,
 552         .build_cp = dasd_fba_build_cp,
 553         .free_cp = dasd_fba_free_cp,
 554         .dump_sense = dasd_fba_dump_sense,
 555         .fill_info = dasd_fba_fill_info,
 556 };
 557
 558 static int __init
 559 dasd_fba_init(void)
 560 {
 561         ASCEBC(dasd_fba_discipline.ebcname, 4);
 562         return ccw_driver_register(&dasd_fba_driver);
 563 }
 564
 565 static void __exit
 566 dasd_fba_cleanup(void)
 567 {
 568         ccw_driver_unregister(&dasd_fba_driver);
 569 }
 570
 571 module_init(dasd_fba_init);
 572 module_exit(dasd_fba_cleanup);