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  * $Revision: 1.39 $
   8  */
   9
  10 #include <linux/config.h>
  11 #include <linux/stddef.h>
  12 #include <linux/kernel.h>
  13 #include <asm/debug.h>
  14
  15 #include <linux/slab.h>
  16 #include <linux/hdreg.h>        /* HDIO_GETGEO                      */
  17 #include <linux/bio.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20
  21 #include <asm/idals.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/io.h>
  24 #include <asm/todclk.h>
  25 #include <asm/ccwdev.h>
  26
  27 #include "dasd_int.h"
  28 #include "dasd_fba.h"
  29
  30 #ifdef PRINTK_HEADER
  31 #undef PRINTK_HEADER
  32 #endif                          /* PRINTK_HEADER */
  33 #define PRINTK_HEADER "dasd(fba):"
  34
  35 #define DASD_FBA_CCW_WRITE 0x41
  36 #define DASD_FBA_CCW_READ 0x42
  37 #define DASD_FBA_CCW_LOCATE 0x43
  38 #define DASD_FBA_CCW_DEFINE_EXTENT 0x63
  39
  40 MODULE_LICENSE("GPL");
  41
  42 static struct dasd_discipline dasd_fba_discipline;
  43
  44 struct dasd_fba_private {
  45         struct dasd_fba_characteristics rdc_data;
  46 };
  47
  48 static struct ccw_device_id dasd_fba_ids[] = {
  49         { CCW_DEVICE_DEVTYPE (0x6310, 0, 0x9336, 0), driver_info: 0x1},
  50         { CCW_DEVICE_DEVTYPE (0x3880, 0, 0x3370, 0), driver_info: 0x2},
  51         { /* end of list */ },
  52 };
  53
  54 MODULE_DEVICE_TABLE(ccw, dasd_fba_ids);
  55
  56 static struct ccw_driver dasd_fba_driver; /* see below */
  57 static int
  58 dasd_fba_probe(struct ccw_device *cdev)
  59 {
  60         int ret;
  61
  62         ret = dasd_generic_probe (cdev, &dasd_fba_discipline);
  63         if (ret)
  64                 return ret;
  65         ccw_device_set_options(cdev, CCWDEV_DO_PATHGROUP);
  66         return 0;
  67 }
  68
  69 static int
  70 dasd_fba_set_online(struct ccw_device *cdev)
  71 {
  72         return dasd_generic_set_online (cdev, &dasd_fba_discipline);
  73 }
  74
  75 static struct ccw_driver dasd_fba_driver = {
  76         .name        = "dasd-fba",
  77         .owner       = THIS_MODULE,
  78         .ids         = dasd_fba_ids,
  79         .probe       = dasd_fba_probe,
  80         .remove      = dasd_generic_remove,
  81         .set_offline = dasd_generic_set_offline,
  82         .set_online  = dasd_fba_set_online,
  83         .notify      = dasd_generic_notify,
  84 };
  85
  86 static inline void
  87 define_extent(struct ccw1 * ccw, struct DE_fba_data *data, int rw,
  88               int blksize, int beg, int nr)
  89 {
  90         ccw->cmd_code = DASD_FBA_CCW_DEFINE_EXTENT;
  91         ccw->flags = 0;
  92         ccw->count = 16;
  93         ccw->cda = (__u32) __pa(data);
  94         memset(data, 0, sizeof (struct DE_fba_data));
  95         if (rw == WRITE)
  96                 (data->mask).perm = 0x0;
  97         else if (rw == READ)
  98                 (data->mask).perm = 0x1;
  99         else
 100                 data->mask.perm = 0x2;
 101         data->blk_size = blksize;
 102         data->ext_loc = beg;
 103         data->ext_end = nr - 1;
 104 }
 105
 106 static inline void
 107 locate_record(struct ccw1 * ccw, struct LO_fba_data *data, int rw,
 108               int block_nr, int block_ct)
 109 {
 110         ccw->cmd_code = DASD_FBA_CCW_LOCATE;
 111         ccw->flags = 0;
 112         ccw->count = 8;
 113         ccw->cda = (__u32) __pa(data);
 114         memset(data, 0, sizeof (struct LO_fba_data));
 115         if (rw == WRITE)
 116                 data->operation.cmd = 0x5;
 117         else if (rw == READ)
 118                 data->operation.cmd = 0x6;
 119         else
 120                 data->operation.cmd = 0x8;
 121         data->blk_nr = block_nr;
 122         data->blk_ct = block_ct;
 123 }
 124
 125 static int
 126 dasd_fba_check_characteristics(struct dasd_device *device)
 127 {
 128         struct dasd_fba_private *private;
 129         struct ccw_device *cdev = device->cdev;
 130         void *rdc_data;
 131         int rc;
 132
 133         private = (struct dasd_fba_private *) device->private;
 134         if (private == NULL) {
 135                 private = kmalloc(sizeof(struct dasd_fba_private), GFP_KERNEL);
 136                 if (private == NULL) {
 137                         DEV_MESSAGE(KERN_WARNING, device, "%s",
 138                                     "memory allocation failed for private "
 139                                     "data");
 140                         return -ENOMEM;
 141                 }
 142                 device->private = (void *) private;
 143         }
 144         /* Read Device Characteristics */
 145         rdc_data = (void *) &(private->rdc_data);
 146         rc = read_dev_chars(device->cdev, &rdc_data, 32);
 147         if (rc) {
 148                 DEV_MESSAGE(KERN_WARNING, device,
 149                             "Read device characteristics returned error %d",
 150                             rc);
 151                 return rc;
 152         }
 153
 154         DEV_MESSAGE(KERN_INFO, device,
 155                     "%04X/%02X(CU:%04X/%02X) %dMB at(%d B/blk)",
 156                     cdev->id.dev_type,
 157                     cdev->id.dev_model,
 158                     cdev->id.cu_type,
 159                     cdev->id.cu_model,
 160                     ((private->rdc_data.blk_bdsa *
 161                       (private->rdc_data.blk_size >> 9)) >> 11),
 162                     private->rdc_data.blk_size);
 163         return 0;
 164 }
 165
 166 static int
 167 dasd_fba_do_analysis(struct dasd_device *device)
 168 {
 169         struct dasd_fba_private *private;
 170         int sb, rc;
 171
 172         private = (struct dasd_fba_private *) device->private;
 173         rc = dasd_check_blocksize(private->rdc_data.blk_size);
 174         if (rc) {
 175                 DEV_MESSAGE(KERN_INFO, device, "unknown blocksize %d",
 176                             private->rdc_data.blk_size);
 177                 return rc;
 178         }
 179         device->blocks = private->rdc_data.blk_bdsa;
 180         device->bp_block = private->rdc_data.blk_size;
 181         device->s2b_shift = 0;  /* bits to shift 512 to get a block */
 182         for (sb = 512; sb < private->rdc_data.blk_size; sb = sb << 1)
 183                 device->s2b_shift++;
 184         return 0;
 185 }
 186
 187 static int
 188 dasd_fba_fill_geometry(struct dasd_device *device, struct hd_geometry *geo)
 189 {
 190         if (dasd_check_blocksize(device->bp_block) != 0)
 191                 return -EINVAL;
 192         geo->cylinders = (device->blocks << device->s2b_shift) >> 10;
 193         geo->heads = 16;
 194         geo->sectors = 128 >> device->s2b_shift;
 195         return 0;
 196 }
 197
 198 static dasd_era_t
 199 dasd_fba_examine_error(struct dasd_ccw_req * cqr, struct irb * irb)
 200 {
 201         struct dasd_device *device;
 202         struct ccw_device *cdev;
 203
 204         device = (struct dasd_device *) cqr->device;
 205         if (irb->scsw.cstat == 0x00 &&
 206             irb->scsw.dstat == (DEV_STAT_CHN_END | DEV_STAT_DEV_END))
 207                 return dasd_era_none;
 208
 209         cdev = device->cdev;
 210         switch (cdev->id.dev_type) {
 211         case 0x3370:
 212                 return dasd_3370_erp_examine(cqr, irb);
 213         case 0x9336:
 214                 return dasd_9336_erp_examine(cqr, irb);
 215         default:
 216                 return dasd_era_recover;
 217         }
 218 }
 219
 220 static dasd_erp_fn_t
 221 dasd_fba_erp_action(struct dasd_ccw_req * cqr)
 222 {
 223         return dasd_default_erp_action;
 224 }
 225
 226 static dasd_erp_fn_t
 227 dasd_fba_erp_postaction(struct dasd_ccw_req * cqr)
 228 {
 229         if (cqr->function == dasd_default_erp_action)
 230                 return dasd_default_erp_postaction;
 231
 232         DEV_MESSAGE(KERN_WARNING, cqr->device, "unknown ERP action %p",
 233                     cqr->function);
 234         return NULL;
 235 }
 236
 237 static struct dasd_ccw_req *
 238 dasd_fba_build_cp(struct dasd_device * device, struct request *req)
 239 {
 240         struct dasd_fba_private *private;
 241         unsigned long *idaws;
 242         struct LO_fba_data *LO_data;
 243         struct dasd_ccw_req *cqr;
 244         struct ccw1 *ccw;
 245         struct bio *bio;
 246         struct bio_vec *bv;
 247         char *dst;
 248         int count, cidaw, cplength, datasize;
 249         sector_t recid, first_rec, last_rec;
 250         unsigned int blksize, off;
 251         unsigned char cmd;
 252         int i;
 253
 254         private = (struct dasd_fba_private *) device->private;
 255         if (rq_data_dir(req) == READ) {
 256                 cmd = DASD_FBA_CCW_READ;
 257         } else if (rq_data_dir(req) == WRITE) {
 258                 cmd = DASD_FBA_CCW_WRITE;
 259         } else
 260                 return ERR_PTR(-EINVAL);
 261         blksize = device->bp_block;
 262         /* Calculate record id of first and last block. */
 263         first_rec = req->sector >> device->s2b_shift;
 264         last_rec = (req->sector + req->nr_sectors - 1) >> device->s2b_shift;
 265         /* Check struct bio and count the number of blocks for the request. */
 266         count = 0;
 267         cidaw = 0;
 268         rq_for_each_bio(bio, req) {
 269                 bio_for_each_segment(bv, bio, i) {
 270                         if (bv->bv_len & (blksize - 1))
 271                                 /* Fba can only do full blocks. */
 272                                 return ERR_PTR(-EINVAL);
 273                         count += bv->bv_len >> (device->s2b_shift + 9);
 274 #if defined(CONFIG_ARCH_S390X)
 275                         if (idal_is_needed (page_address(bv->bv_page),
 276                                             bv->bv_len))
 277                                 cidaw += bv->bv_len / blksize;
 278 #endif
 279                 }
 280         }
 281         /* Paranoia. */
 282         if (count != last_rec - first_rec + 1)
 283                 return ERR_PTR(-EINVAL);
 284         /* 1x define extent + 1x locate record + number of blocks */
 285         cplength = 2 + count;
 286         /* 1x define extent + 1x locate record */
 287         datasize = sizeof(struct DE_fba_data) + sizeof(struct LO_fba_data) +
 288                 cidaw * sizeof(unsigned long);
 289         /*
 290          * Find out number of additional locate record ccws if the device
 291          * can't do data chaining.
 292          */
 293         if (private->rdc_data.mode.bits.data_chain == 0) {
 294                 cplength += count - 1;
 295                 datasize += (count - 1)*sizeof(struct LO_fba_data);
 296         }
 297         /* Allocate the ccw request. */
 298         cqr = dasd_smalloc_request(dasd_fba_discipline.name,
 299                                    cplength, datasize, device);
 300         if (IS_ERR(cqr))
 301                 return cqr;
 302         ccw = cqr->cpaddr;
 303         /* First ccw is define extent. */
 304         define_extent(ccw++, cqr->data, rq_data_dir(req),
 305                       device->bp_block, req->sector, req->nr_sectors);
 306         /* Build locate_record + read/write ccws. */
 307         idaws = (unsigned long *) (cqr->data + sizeof(struct DE_fba_data));
 308         LO_data = (struct LO_fba_data *) (idaws + cidaw);
 309         /* Locate record for all blocks for smart devices. */
 310         if (private->rdc_data.mode.bits.data_chain != 0) {
 311                 ccw[-1].flags |= CCW_FLAG_CC;
 312                 locate_record(ccw++, LO_data++, rq_data_dir(req), 0, count);
 313         }
 314         recid = first_rec;
 315         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 316                 dst = page_address(bv->bv_page) + bv->bv_offset;
 317                 if (dasd_page_cache) {
 318                         char *copy = kmem_cache_alloc(dasd_page_cache,
 319                                                       SLAB_DMA | __GFP_NOWARN);
 320                         if (copy && rq_data_dir(req) == WRITE)
 321                                 memcpy(copy + bv->bv_offset, dst, bv->bv_len);
 322                         if (copy)
 323                                 dst = copy + bv->bv_offset;
 324                 }
 325                 for (off = 0; off < bv->bv_len; off += blksize) {
 326                         /* Locate record for stupid devices. */
 327                         if (private->rdc_data.mode.bits.data_chain == 0) {
 328                                 ccw[-1].flags |= CCW_FLAG_CC;
 329                                 locate_record(ccw, LO_data++,
 330                                               rq_data_dir(req),
 331                                               recid - first_rec, 1);
 332                                 ccw->flags = CCW_FLAG_CC;
 333                                 ccw++;
 334                         } else {
 335                                 if (recid > first_rec)
 336                                         ccw[-1].flags |= CCW_FLAG_DC;
 337                                 else
 338                                         ccw[-1].flags |= CCW_FLAG_CC;
 339                         }
 340                         ccw->cmd_code = cmd;
 341                         ccw->count = device->bp_block;
 342                         if (idal_is_needed(dst, blksize)) {
 343                                 ccw->cda = (__u32)(addr_t) idaws;
 344                                 ccw->flags = CCW_FLAG_IDA;
 345                                 idaws = idal_create_words(idaws, dst, blksize);
 346                         } else {
 347                                 ccw->cda = (__u32)(addr_t) dst;
 348                                 ccw->flags = 0;
 349                         }
 350                         ccw++;
 351                         dst += blksize;
 352                         recid++;
 353                 }
 354         }
 355         cqr->device = device;
 356         cqr->expires = 5 * 60 * HZ;     /* 5 minutes */
 357         cqr->status = DASD_CQR_FILLED;
 358         return cqr;
 359 }
 360
 361 static int
 362 dasd_fba_free_cp(struct dasd_ccw_req *cqr, struct request *req)
 363 {
 364         struct dasd_fba_private *private;
 365         struct ccw1 *ccw;
 366         struct bio *bio;
 367         struct bio_vec *bv;
 368         char *dst, *cda;
 369         unsigned int blksize, off;
 370         int i, status;
 371
 372         if (!dasd_page_cache)
 373                 goto out;
 374         private = (struct dasd_fba_private *) cqr->device->private;
 375         blksize = cqr->device->bp_block;
 376         ccw = cqr->cpaddr;
 377         /* Skip over define extent & locate record. */
 378         ccw++;
 379         if (private->rdc_data.mode.bits.data_chain != 0)
 380                 ccw++;
 381         rq_for_each_bio(bio, req) bio_for_each_segment(bv, bio, i) {
 382                 dst = page_address(bv->bv_page) + bv->bv_offset;
 383                 for (off = 0; off < bv->bv_len; off += blksize) {
 384                         /* Skip locate record. */
 385                         if (private->rdc_data.mode.bits.data_chain == 0)
 386                                 ccw++;
 387                         if (dst) {
 388                                 if (ccw->flags & CCW_FLAG_IDA)
 389                                         cda = *((char **)((addr_t) ccw->cda));
 390                                 else
 391                                         cda = (char *)((addr_t) ccw->cda);
 392                                 if (dst != cda) {
 393                                         if (rq_data_dir(req) == READ)
 394                                                 memcpy(dst, cda, bv->bv_len);
 395                                         kmem_cache_free(dasd_page_cache,
 396                                             (void *)((addr_t)cda & PAGE_MASK));
 397                                 }
 398                                 dst = NULL;
 399                         }
 400                         ccw++;
 401                 }
 402         }
 403 out:
 404         status = cqr->status == DASD_CQR_DONE;
 405         dasd_sfree_request(cqr, cqr->device);
 406         return status;
 407 }
 408
 409 static int
 410 dasd_fba_fill_info(struct dasd_device * device,
 411                    struct dasd_information2_t * info)
 412 {
 413         info->label_block = 1;
 414         info->FBA_layout = 1;
 415         info->format = DASD_FORMAT_LDL;
 416         info->characteristics_size = sizeof(struct dasd_fba_characteristics);
 417         memcpy(info->characteristics,
 418                &((struct dasd_fba_private *) device->private)->rdc_data,
 419                sizeof (struct dasd_fba_characteristics));
 420         info->confdata_size = 0;
 421         return 0;
 422 }
 423
 424 static void
 425 dasd_fba_dump_sense(struct dasd_device *device, struct dasd_ccw_req * req,
 426                     struct irb *irb)
 427 {
 428         char *page;
 429         struct ccw1 *act, *end, *last;
 430         int len, sl, sct, count;
 431
 432         page = (char *) get_zeroed_page(GFP_ATOMIC);
 433         if (page == NULL) {
 434                 DEV_MESSAGE(KERN_ERR, device, " %s",
 435                             "No memory to dump sense data");
 436                 return;
 437         }
 438         len = sprintf(page, KERN_ERR PRINTK_HEADER
 439                       " I/O status report for device %s:\n",
 440                       device->cdev->dev.bus_id);
 441         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 442                        " in req: %p CS: 0x%02X DS: 0x%02X\n", req,
 443                        irb->scsw.cstat, irb->scsw.dstat);
 444         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 445                        " device %s: Failing CCW: %p\n",
 446                        device->cdev->dev.bus_id,
 447                        (void *) (addr_t) irb->scsw.cpa);
 448         if (irb->esw.esw0.erw.cons) {
 449                 for (sl = 0; sl < 4; sl++) {
 450                         len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 451                                        " Sense(hex) %2d-%2d:",
 452                                        (8 * sl), ((8 * sl) + 7));
 453
 454                         for (sct = 0; sct < 8; sct++) {
 455                                 len += sprintf(page + len, " %02x",
 456                                                irb->ecw[8 * sl + sct]);
 457                         }
 458                         len += sprintf(page + len, "\n");
 459                 }
 460         } else {
 461                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 462                                " SORRY - NO VALID SENSE AVAILABLE\n");
 463         }
 464         MESSAGE_LOG(KERN_ERR, "%s",
 465                     page + sizeof(KERN_ERR PRINTK_HEADER));
 466
 467         /* dump the Channel Program */
 468         /* print first CCWs (maximum 8) */
 469         act = req->cpaddr;
 470         for (last = act; last->flags & (CCW_FLAG_CC | CCW_FLAG_DC); last++);
 471         end = min(act + 8, last);
 472         len = sprintf(page, KERN_ERR PRINTK_HEADER
 473                       " Related CP in req: %p\n", req);
 474         while (act <= end) {
 475                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 476                                " CCW %p: %08X %08X DAT:",
 477                                act, ((int *) act)[0], ((int *) act)[1]);
 478                 for (count = 0; count < 32 && count < act->count;
 479                      count += sizeof(int))
 480                         len += sprintf(page + len, " %08X",
 481                                        ((int *) (addr_t) act->cda)
 482                                        [(count>>2)]);
 483                 len += sprintf(page + len, "\n");
 484                 act++;
 485         }
 486         MESSAGE_LOG(KERN_ERR, "%s",
 487                     page + sizeof(KERN_ERR PRINTK_HEADER));
 488
 489
 490         /* print failing CCW area */
 491         len = 0;
 492         if (act <  ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2) {
 493                 act = ((struct ccw1 *)(addr_t) irb->scsw.cpa) - 2;
 494                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 495         }
 496         end = min((struct ccw1 *)(addr_t) irb->scsw.cpa + 2, last);
 497         while (act <= end) {
 498                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 499                                " CCW %p: %08X %08X DAT:",
 500                                act, ((int *) act)[0], ((int *) act)[1]);
 501                 for (count = 0; count < 32 && count < act->count;
 502                      count += sizeof(int))
 503                         len += sprintf(page + len, " %08X",
 504                                        ((int *) (addr_t) act->cda)
 505                                        [(count>>2)]);
 506                 len += sprintf(page + len, "\n");
 507                 act++;
 508         }
 509
 510         /* print last CCWs */
 511         if (act <  last - 2) {
 512                 act = last - 2;
 513                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER "......\n");
 514         }
 515         while (act <= last) {
 516                 len += sprintf(page + len, KERN_ERR PRINTK_HEADER
 517                                " CCW %p: %08X %08X DAT:",
 518                                act, ((int *) act)[0], ((int *) act)[1]);
 519                 for (count = 0; count < 32 && count < act->count;
 520                      count += sizeof(int))
 521                         len += sprintf(page + len, " %08X",
 522                                        ((int *) (addr_t) act->cda)
 523                                        [(count>>2)]);
 524                 len += sprintf(page + len, "\n");
 525                 act++;
 526         }
 527         if (len > 0)
 528                 MESSAGE_LOG(KERN_ERR, "%s",
 529                             page + sizeof(KERN_ERR PRINTK_HEADER));
 530         free_page((unsigned long) page);
 531 }
 532
 533 /*
 534  * max_blocks is dependent on the amount of storage that is available
 535  * in the static io buffer for each device. Currently each device has
 536  * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has
 537  * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use
 538  * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In
 539  * addition we have one define extent ccw + 16 bytes of data and a
 540  * locate record ccw for each block (stupid devices!) + 16 bytes of data.
 541  * That makes:
 542  * (8192 - 24 - 136 - 8 - 16) / 40 = 200.2 blocks at maximum.
 543  * We want to fit two into the available memory so that we can immediately
 544  * start the next request if one finishes off. That makes 100.1 blocks
 545  * for one request. Give a little safety and the result is 96.
 546  */
 547 static struct dasd_discipline dasd_fba_discipline = {
 548         .owner = THIS_MODULE,
 549         .name = "FBA ",
 550         .ebcname = "FBA ",
 551         .max_blocks = 96,
 552         .check_device = dasd_fba_check_characteristics,
 553         .do_analysis = dasd_fba_do_analysis,
 554         .fill_geometry = dasd_fba_fill_geometry,
 555         .start_IO = dasd_start_IO,
 556         .term_IO = dasd_term_IO,
 557         .examine_error = dasd_fba_examine_error,
 558         .erp_action = dasd_fba_erp_action,
 559         .erp_postaction = dasd_fba_erp_postaction,
 560         .build_cp = dasd_fba_build_cp,
 561         .free_cp = dasd_fba_free_cp,
 562         .dump_sense = dasd_fba_dump_sense,
 563         .fill_info = dasd_fba_fill_info,
 564 };
 565
 566 static int __init
 567 dasd_fba_init(void)
 568 {
 569         int ret;
 570
 571         ASCEBC(dasd_fba_discipline.ebcname, 4);
 572
 573         ret = ccw_driver_register(&dasd_fba_driver);
 574         if (ret)
 575                 return ret;
 576
 577         dasd_generic_auto_online(&dasd_fba_driver);
 578         return 0;
 579 }
 580
 581 static void __exit
 582 dasd_fba_cleanup(void)
 583 {
 584         ccw_driver_unregister(&dasd_fba_driver);
 585 }
 586
 587 module_init(dasd_fba_init);
 588 module_exit(dasd_fba_cleanup);
 589
 590 /*
 591  * Overrides for Emacs so that we follow Linus's tabbing style.
 592  * Emacs will notice this stuff at the end of the file and automatically
 593  * adjust the settings for this buffer only.  This must remain at the end
 594  * of the file.
 595  * ---------------------------------------------------------------------------
 596  * Local variables:
 597  * c-indent-level: 4
 598  * c-brace-imaginary-offset: 0
 599  * c-brace-offset: -4
 600  * c-argdecl-indent: 4
 601  * c-label-offset: -4
 602  * c-continued-statement-offset: 4
 603  * c-continued-brace-offset: 0
 604  * indent-tabs-mode: 1
 605  * tab-width: 8
 606  * End:
 607  */