linux/arch/s390/kernel/debug.c
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   1/*
   2 *  arch/s390/kernel/debug.c
   3 *   S/390 debug facility
   4 *
   5 *    Copyright (C) 1999, 2000 IBM Deutschland Entwicklung GmbH,
   6 *                             IBM Corporation
   7 *    Author(s): Michael Holzheu (holzheu@de.ibm.com),
   8 *               Holger Smolinski (Holger.Smolinski@de.ibm.com)
   9 *
  10 *    Bugreports to: <Linux390@de.ibm.com>
  11 */
  12
  13#include <linux/stddef.h>
  14#include <linux/kernel.h>
  15#include <linux/errno.h>
  16#include <linux/slab.h>
  17#include <linux/ctype.h>
  18#include <linux/sysctl.h>
  19#include <asm/uaccess.h>
  20#include <linux/module.h>
  21#include <linux/init.h>
  22#include <linux/fs.h>
  23#include <linux/debugfs.h>
  24
  25#include <asm/debug.h>
  26
  27#define DEBUG_PROLOG_ENTRY -1
  28
  29#define ALL_AREAS 0 /* copy all debug areas */
  30#define NO_AREAS  1 /* copy no debug areas */
  31
  32/* typedefs */
  33
  34typedef struct file_private_info {
  35        loff_t offset;                  /* offset of last read in file */
  36        int    act_area;                /* number of last formated area */
  37        int    act_page;                /* act page in given area */
  38        int    act_entry;               /* last formated entry (offset */
  39                                        /* relative to beginning of last */
  40                                        /* formated page) */
  41        size_t act_entry_offset;        /* up to this offset we copied */
  42                                        /* in last read the last formated */
  43                                        /* entry to userland */
  44        char   temp_buf[2048];          /* buffer for output */
  45        debug_info_t *debug_info_org;   /* original debug information */
  46        debug_info_t *debug_info_snap;  /* snapshot of debug information */
  47        struct debug_view *view;        /* used view of debug info */
  48} file_private_info_t;
  49
  50typedef struct
  51{
  52        char *string;
  53        /* 
  54         * This assumes that all args are converted into longs 
  55         * on L/390 this is the case for all types of parameter 
  56         * except of floats, and long long (32 bit) 
  57         *
  58         */
  59        long args[0];
  60} debug_sprintf_entry_t;
  61
  62
  63extern void tod_to_timeval(uint64_t todval, struct timespec *xtime);
  64
  65/* internal function prototyes */
  66
  67static int debug_init(void);
  68static ssize_t debug_output(struct file *file, char __user *user_buf,
  69                        size_t user_len, loff_t * offset);
  70static ssize_t debug_input(struct file *file, const char __user *user_buf,
  71                        size_t user_len, loff_t * offset);
  72static int debug_open(struct inode *inode, struct file *file);
  73static int debug_close(struct inode *inode, struct file *file);
  74static debug_info_t *debug_info_create(const char *name, int pages_per_area,
  75                        int nr_areas, int buf_size, mode_t mode);
  76static void debug_info_get(debug_info_t *);
  77static void debug_info_put(debug_info_t *);
  78static int debug_prolog_level_fn(debug_info_t * id,
  79                        struct debug_view *view, char *out_buf);
  80static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
  81                        struct file *file, const char __user *user_buf,
  82                        size_t user_buf_size, loff_t * offset);
  83static int debug_prolog_pages_fn(debug_info_t * id,
  84                        struct debug_view *view, char *out_buf);
  85static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
  86                        struct file *file, const char __user *user_buf,
  87                        size_t user_buf_size, loff_t * offset);
  88static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
  89                        struct file *file, const char __user *user_buf,
  90                        size_t user_buf_size, loff_t * offset);
  91static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
  92                        char *out_buf, const char *in_buf);
  93static int debug_raw_format_fn(debug_info_t * id,
  94                        struct debug_view *view, char *out_buf,
  95                        const char *in_buf);
  96static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
  97                        int area, debug_entry_t * entry, char *out_buf);
  98
  99static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
 100                        char *out_buf, debug_sprintf_entry_t *curr_event);
 101
 102/* globals */
 103
 104struct debug_view debug_raw_view = {
 105        "raw",
 106        NULL,
 107        &debug_raw_header_fn,
 108        &debug_raw_format_fn,
 109        NULL,
 110        NULL
 111};
 112
 113struct debug_view debug_hex_ascii_view = {
 114        "hex_ascii",
 115        NULL,
 116        &debug_dflt_header_fn,
 117        &debug_hex_ascii_format_fn,
 118        NULL,
 119        NULL
 120};
 121
 122static struct debug_view debug_level_view = {
 123        "level",
 124        &debug_prolog_level_fn,
 125        NULL,
 126        NULL,
 127        &debug_input_level_fn,
 128        NULL
 129};
 130
 131static struct debug_view debug_pages_view = {
 132        "pages",
 133        &debug_prolog_pages_fn,
 134        NULL,
 135        NULL,
 136        &debug_input_pages_fn,
 137        NULL
 138};
 139
 140static struct debug_view debug_flush_view = {
 141        "flush",
 142        NULL,
 143        NULL,
 144        NULL,
 145        &debug_input_flush_fn,
 146        NULL
 147};
 148
 149struct debug_view debug_sprintf_view = {
 150        "sprintf",
 151        NULL,
 152        &debug_dflt_header_fn,
 153        (debug_format_proc_t*)&debug_sprintf_format_fn,
 154        NULL,
 155        NULL
 156};
 157
 158/* used by dump analysis tools to determine version of debug feature */
 159static unsigned int __used debug_feature_version = __DEBUG_FEATURE_VERSION;
 160
 161/* static globals */
 162
 163static debug_info_t *debug_area_first = NULL;
 164static debug_info_t *debug_area_last = NULL;
 165static DEFINE_MUTEX(debug_mutex);
 166
 167static int initialized;
 168
 169static const struct file_operations debug_file_ops = {
 170        .owner   = THIS_MODULE,
 171        .read    = debug_output,
 172        .write   = debug_input,
 173        .open    = debug_open,
 174        .release = debug_close,
 175};
 176
 177static struct dentry *debug_debugfs_root_entry;
 178
 179/* functions */
 180
 181/*
 182 * debug_areas_alloc
 183 * - Debug areas are implemented as a threedimensonal array:
 184 *   areas[areanumber][pagenumber][pageoffset]
 185 */
 186
 187static debug_entry_t***
 188debug_areas_alloc(int pages_per_area, int nr_areas)
 189{
 190        debug_entry_t*** areas;
 191        int i,j;
 192
 193        areas = kmalloc(nr_areas *
 194                                        sizeof(debug_entry_t**),
 195                                        GFP_KERNEL);
 196        if (!areas)
 197                goto fail_malloc_areas;
 198        for (i = 0; i < nr_areas; i++) {
 199                areas[i] = kmalloc(pages_per_area *
 200                                sizeof(debug_entry_t*),GFP_KERNEL);
 201                if (!areas[i]) {
 202                        goto fail_malloc_areas2;
 203                }
 204                for(j = 0; j < pages_per_area; j++) {
 205                        areas[i][j] = kzalloc(PAGE_SIZE, GFP_KERNEL);
 206                        if(!areas[i][j]) {
 207                                for(j--; j >=0 ; j--) {
 208                                        kfree(areas[i][j]);
 209                                }
 210                                kfree(areas[i]);
 211                                goto fail_malloc_areas2;
 212                        }
 213                }
 214        }
 215        return areas;
 216
 217fail_malloc_areas2:
 218        for(i--; i >= 0; i--){
 219                for(j=0; j < pages_per_area;j++){
 220                        kfree(areas[i][j]);
 221                }
 222                kfree(areas[i]);
 223        }
 224        kfree(areas);
 225fail_malloc_areas:
 226        return NULL;
 227
 228}
 229
 230
 231/*
 232 * debug_info_alloc
 233 * - alloc new debug-info
 234 */
 235
 236static debug_info_t*
 237debug_info_alloc(const char *name, int pages_per_area, int nr_areas,
 238                 int buf_size, int level, int mode)
 239{
 240        debug_info_t* rc;
 241
 242        /* alloc everything */
 243
 244        rc = kmalloc(sizeof(debug_info_t), GFP_KERNEL);
 245        if(!rc)
 246                goto fail_malloc_rc;
 247        rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
 248        if(!rc->active_entries)
 249                goto fail_malloc_active_entries;
 250        rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
 251        if(!rc->active_pages)
 252                goto fail_malloc_active_pages;
 253        if((mode == ALL_AREAS) && (pages_per_area != 0)){
 254                rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
 255                if(!rc->areas)
 256                        goto fail_malloc_areas;
 257        } else {
 258                rc->areas = NULL;
 259        }
 260
 261        /* initialize members */
 262
 263        spin_lock_init(&rc->lock);
 264        rc->pages_per_area = pages_per_area;
 265        rc->nr_areas       = nr_areas;
 266        rc->active_area    = 0;
 267        rc->level          = level;
 268        rc->buf_size       = buf_size;
 269        rc->entry_size     = sizeof(debug_entry_t) + buf_size;
 270        strlcpy(rc->name, name, sizeof(rc->name));
 271        memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
 272        memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
 273                sizeof(struct dentry*));
 274        atomic_set(&(rc->ref_count), 0);
 275
 276        return rc;
 277
 278fail_malloc_areas:
 279        kfree(rc->active_pages);
 280fail_malloc_active_pages:
 281        kfree(rc->active_entries);
 282fail_malloc_active_entries:
 283        kfree(rc);
 284fail_malloc_rc:
 285        return NULL;
 286}
 287
 288/*
 289 * debug_areas_free
 290 * - free all debug areas
 291 */
 292
 293static void
 294debug_areas_free(debug_info_t* db_info)
 295{
 296        int i,j;
 297
 298        if(!db_info->areas)
 299                return;
 300        for (i = 0; i < db_info->nr_areas; i++) {
 301                for(j = 0; j < db_info->pages_per_area; j++) {
 302                        kfree(db_info->areas[i][j]);
 303                }
 304                kfree(db_info->areas[i]);
 305        }
 306        kfree(db_info->areas);
 307        db_info->areas = NULL;
 308}
 309
 310/*
 311 * debug_info_free
 312 * - free memory debug-info
 313 */
 314
 315static void
 316debug_info_free(debug_info_t* db_info){
 317        debug_areas_free(db_info);
 318        kfree(db_info->active_entries);
 319        kfree(db_info->active_pages);
 320        kfree(db_info);
 321}
 322
 323/*
 324 * debug_info_create
 325 * - create new debug-info
 326 */
 327
 328static debug_info_t*
 329debug_info_create(const char *name, int pages_per_area, int nr_areas,
 330                  int buf_size, mode_t mode)
 331{
 332        debug_info_t* rc;
 333
 334        rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
 335                                DEBUG_DEFAULT_LEVEL, ALL_AREAS);
 336        if(!rc) 
 337                goto out;
 338
 339        rc->mode = mode & ~S_IFMT;
 340
 341        /* create root directory */
 342        rc->debugfs_root_entry = debugfs_create_dir(rc->name,
 343                                        debug_debugfs_root_entry);
 344
 345        /* append new element to linked list */
 346        if (!debug_area_first) {
 347                /* first element in list */
 348                debug_area_first = rc;
 349                rc->prev = NULL;
 350        } else {
 351                /* append element to end of list */
 352                debug_area_last->next = rc;
 353                rc->prev = debug_area_last;
 354        }
 355        debug_area_last = rc;
 356        rc->next = NULL;
 357
 358        debug_info_get(rc);
 359out:
 360        return rc;
 361}
 362
 363/*
 364 * debug_info_copy
 365 * - copy debug-info
 366 */
 367
 368static debug_info_t*
 369debug_info_copy(debug_info_t* in, int mode)
 370{
 371        int i,j;
 372        debug_info_t* rc;
 373        unsigned long flags;
 374
 375        /* get a consistent copy of the debug areas */
 376        do {
 377                rc = debug_info_alloc(in->name, in->pages_per_area,
 378                        in->nr_areas, in->buf_size, in->level, mode);
 379                spin_lock_irqsave(&in->lock, flags);
 380                if(!rc)
 381                        goto out;
 382                /* has something changed in the meantime ? */
 383                if((rc->pages_per_area == in->pages_per_area) &&
 384                   (rc->nr_areas == in->nr_areas)) {
 385                        break;
 386                }
 387                spin_unlock_irqrestore(&in->lock, flags);
 388                debug_info_free(rc);
 389        } while (1);
 390
 391        if(!rc || (mode == NO_AREAS))
 392                goto out;
 393
 394        for(i = 0; i < in->nr_areas; i++){
 395                for(j = 0; j < in->pages_per_area; j++) {
 396                        memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
 397                }
 398        }
 399out:
 400        spin_unlock_irqrestore(&in->lock, flags);
 401        return rc;
 402}
 403
 404/*
 405 * debug_info_get
 406 * - increments reference count for debug-info
 407 */
 408
 409static void
 410debug_info_get(debug_info_t * db_info)
 411{
 412        if (db_info)
 413                atomic_inc(&db_info->ref_count);
 414}
 415
 416/*
 417 * debug_info_put:
 418 * - decreases reference count for debug-info and frees it if necessary
 419 */
 420
 421static void
 422debug_info_put(debug_info_t *db_info)
 423{
 424        int i;
 425
 426        if (!db_info)
 427                return;
 428        if (atomic_dec_and_test(&db_info->ref_count)) {
 429                for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 430                        if (!db_info->views[i])
 431                                continue;
 432                        debugfs_remove(db_info->debugfs_entries[i]);
 433                }
 434                debugfs_remove(db_info->debugfs_root_entry);
 435                if(db_info == debug_area_first)
 436                        debug_area_first = db_info->next;
 437                if(db_info == debug_area_last)
 438                        debug_area_last = db_info->prev;
 439                if(db_info->prev) db_info->prev->next = db_info->next;
 440                if(db_info->next) db_info->next->prev = db_info->prev;
 441                debug_info_free(db_info);
 442        }
 443}
 444
 445/*
 446 * debug_format_entry:
 447 * - format one debug entry and return size of formated data
 448 */
 449
 450static int
 451debug_format_entry(file_private_info_t *p_info)
 452{
 453        debug_info_t *id_snap   = p_info->debug_info_snap;
 454        struct debug_view *view = p_info->view;
 455        debug_entry_t *act_entry;
 456        size_t len = 0;
 457        if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 458                /* print prolog */
 459                if (view->prolog_proc)
 460                        len += view->prolog_proc(id_snap,view,p_info->temp_buf);
 461                goto out;
 462        }
 463        if (!id_snap->areas) /* this is true, if we have a prolog only view */
 464                goto out;    /* or if 'pages_per_area' is 0 */
 465        act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
 466                                [p_info->act_page] + p_info->act_entry);
 467                        
 468        if (act_entry->id.stck == 0LL)
 469                        goto out;  /* empty entry */
 470        if (view->header_proc)
 471                len += view->header_proc(id_snap, view, p_info->act_area,
 472                                        act_entry, p_info->temp_buf + len);
 473        if (view->format_proc)
 474                len += view->format_proc(id_snap, view, p_info->temp_buf + len,
 475                                                DEBUG_DATA(act_entry));
 476out:
 477        return len;
 478}
 479
 480/*
 481 * debug_next_entry:
 482 * - goto next entry in p_info
 483 */
 484
 485static inline int
 486debug_next_entry(file_private_info_t *p_info)
 487{
 488        debug_info_t *id;
 489
 490        id = p_info->debug_info_snap;
 491        if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 492                p_info->act_entry = 0;
 493                p_info->act_page  = 0;
 494                goto out;
 495        }
 496        if(!id->areas)
 497                return 1;
 498        p_info->act_entry += id->entry_size;
 499        /* switch to next page, if we reached the end of the page  */
 500        if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
 501                /* next page */
 502                p_info->act_entry = 0;
 503                p_info->act_page += 1;
 504                if((p_info->act_page % id->pages_per_area) == 0) {
 505                        /* next area */
 506                        p_info->act_area++;
 507                        p_info->act_page=0;
 508                }
 509                if(p_info->act_area >= id->nr_areas)
 510                        return 1;
 511        }
 512out:
 513        return 0;       
 514}
 515
 516/*
 517 * debug_output:
 518 * - called for user read()
 519 * - copies formated debug entries to the user buffer
 520 */
 521
 522static ssize_t
 523debug_output(struct file *file,         /* file descriptor */
 524            char __user *user_buf,      /* user buffer */
 525            size_t  len,                /* length of buffer */
 526            loff_t *offset)             /* offset in the file */
 527{
 528        size_t count = 0;
 529        size_t entry_offset;
 530        file_private_info_t *p_info;
 531
 532        p_info = ((file_private_info_t *) file->private_data);
 533        if (*offset != p_info->offset) 
 534                return -EPIPE;
 535        if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
 536                return 0;
 537        entry_offset = p_info->act_entry_offset;
 538        while(count < len){
 539                int formatted_line_size;
 540                int formatted_line_residue;
 541                int user_buf_residue;
 542                size_t copy_size;
 543
 544                formatted_line_size = debug_format_entry(p_info);
 545                formatted_line_residue = formatted_line_size - entry_offset;
 546                user_buf_residue = len-count;
 547                copy_size = min(user_buf_residue, formatted_line_residue);
 548                if(copy_size){
 549                        if (copy_to_user(user_buf + count, p_info->temp_buf
 550                                        + entry_offset, copy_size))
 551                                return -EFAULT;
 552                        count += copy_size;
 553                        entry_offset += copy_size;
 554                }
 555                if(copy_size == formatted_line_residue){
 556                        entry_offset = 0;
 557                        if(debug_next_entry(p_info))
 558                                goto out;
 559                }
 560        }
 561out:
 562        p_info->offset           = *offset + count;
 563        p_info->act_entry_offset = entry_offset;
 564        *offset = p_info->offset;
 565        return count;
 566}
 567
 568/*
 569 * debug_input:
 570 * - called for user write()
 571 * - calls input function of view
 572 */
 573
 574static ssize_t
 575debug_input(struct file *file, const char __user *user_buf, size_t length,
 576                loff_t *offset)
 577{
 578        int rc = 0;
 579        file_private_info_t *p_info;
 580
 581        mutex_lock(&debug_mutex);
 582        p_info = ((file_private_info_t *) file->private_data);
 583        if (p_info->view->input_proc)
 584                rc = p_info->view->input_proc(p_info->debug_info_org,
 585                                              p_info->view, file, user_buf,
 586                                              length, offset);
 587        else
 588                rc = -EPERM;
 589        mutex_unlock(&debug_mutex);
 590        return rc;              /* number of input characters */
 591}
 592
 593/*
 594 * debug_open:
 595 * - called for user open()
 596 * - copies formated output to private_data area of the file
 597 *   handle
 598 */
 599
 600static int
 601debug_open(struct inode *inode, struct file *file)
 602{
 603        int i = 0, rc = 0;
 604        file_private_info_t *p_info;
 605        debug_info_t *debug_info, *debug_info_snapshot;
 606
 607        mutex_lock(&debug_mutex);
 608        debug_info = file->f_path.dentry->d_inode->i_private;
 609        /* find debug view */
 610        for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 611                if (!debug_info->views[i])
 612                        continue;
 613                else if (debug_info->debugfs_entries[i] ==
 614                         file->f_path.dentry) {
 615                        goto found;     /* found view ! */
 616                }
 617        }
 618        /* no entry found */
 619        rc = -EINVAL;
 620        goto out;
 621
 622found:
 623
 624        /* Make snapshot of current debug areas to get it consistent.     */
 625        /* To copy all the areas is only needed, if we have a view which  */
 626        /* formats the debug areas. */
 627
 628        if(!debug_info->views[i]->format_proc &&
 629                !debug_info->views[i]->header_proc){
 630                debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
 631        } else {
 632                debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
 633        }
 634
 635        if(!debug_info_snapshot){
 636                rc = -ENOMEM;
 637                goto out;
 638        }
 639        p_info = kmalloc(sizeof(file_private_info_t),
 640                                                GFP_KERNEL);
 641        if(!p_info){
 642                if(debug_info_snapshot)
 643                        debug_info_free(debug_info_snapshot);
 644                rc = -ENOMEM;
 645                goto out;
 646        }
 647        p_info->offset = 0;
 648        p_info->debug_info_snap = debug_info_snapshot;
 649        p_info->debug_info_org  = debug_info;
 650        p_info->view = debug_info->views[i];
 651        p_info->act_area = 0;
 652        p_info->act_page = 0;
 653        p_info->act_entry = DEBUG_PROLOG_ENTRY;
 654        p_info->act_entry_offset = 0;
 655        file->private_data = p_info;
 656        debug_info_get(debug_info);
 657out:
 658        mutex_unlock(&debug_mutex);
 659        return rc;
 660}
 661
 662/*
 663 * debug_close:
 664 * - called for user close()
 665 * - deletes  private_data area of the file handle
 666 */
 667
 668static int
 669debug_close(struct inode *inode, struct file *file)
 670{
 671        file_private_info_t *p_info;
 672        p_info = (file_private_info_t *) file->private_data;
 673        if(p_info->debug_info_snap)
 674                debug_info_free(p_info->debug_info_snap);
 675        debug_info_put(p_info->debug_info_org);
 676        kfree(file->private_data);
 677        return 0;               /* success */
 678}
 679
 680/*
 681 * debug_register_mode:
 682 * - Creates and initializes debug area for the caller
 683 *   The mode parameter allows to specify access rights for the s390dbf files
 684 * - Returns handle for debug area
 685 */
 686
 687debug_info_t *debug_register_mode(const char *name, int pages_per_area,
 688                                  int nr_areas, int buf_size, mode_t mode,
 689                                  uid_t uid, gid_t gid)
 690{
 691        debug_info_t *rc = NULL;
 692
 693        /* Since debugfs currently does not support uid/gid other than root, */
 694        /* we do not allow gid/uid != 0 until we get support for that. */
 695        if ((uid != 0) || (gid != 0))
 696                printk(KERN_WARNING "debug: Warning - Currently only uid/gid "
 697                       "= 0 are supported. Using root as owner now!");
 698        if (!initialized)
 699                BUG();
 700        mutex_lock(&debug_mutex);
 701
 702        /* create new debug_info */
 703
 704        rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
 705        if(!rc) 
 706                goto out;
 707        debug_register_view(rc, &debug_level_view);
 708        debug_register_view(rc, &debug_flush_view);
 709        debug_register_view(rc, &debug_pages_view);
 710out:
 711        if (!rc){
 712                printk(KERN_ERR "debug: debug_register failed for %s\n",name);
 713        }
 714        mutex_unlock(&debug_mutex);
 715        return rc;
 716}
 717EXPORT_SYMBOL(debug_register_mode);
 718
 719/*
 720 * debug_register:
 721 * - creates and initializes debug area for the caller
 722 * - returns handle for debug area
 723 */
 724
 725debug_info_t *debug_register(const char *name, int pages_per_area,
 726                             int nr_areas, int buf_size)
 727{
 728        return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
 729                                   S_IRUSR | S_IWUSR, 0, 0);
 730}
 731
 732/*
 733 * debug_unregister:
 734 * - give back debug area
 735 */
 736
 737void
 738debug_unregister(debug_info_t * id)
 739{
 740        if (!id)
 741                goto out;
 742        mutex_lock(&debug_mutex);
 743        debug_info_put(id);
 744        mutex_unlock(&debug_mutex);
 745
 746out:
 747        return;
 748}
 749
 750/*
 751 * debug_set_size:
 752 * - set area size (number of pages) and number of areas
 753 */
 754static int
 755debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
 756{
 757        unsigned long flags;
 758        debug_entry_t *** new_areas;
 759        int rc=0;
 760
 761        if(!id || (nr_areas <= 0) || (pages_per_area < 0))
 762                return -EINVAL;
 763        if(pages_per_area > 0){
 764                new_areas = debug_areas_alloc(pages_per_area, nr_areas);
 765                if(!new_areas) {
 766                        printk(KERN_WARNING "debug: could not allocate memory "\
 767                                         "for pagenumber: %i\n",pages_per_area);
 768                        rc = -ENOMEM;
 769                        goto out;
 770                }
 771        } else {
 772                new_areas = NULL;
 773        }
 774        spin_lock_irqsave(&id->lock,flags);
 775        debug_areas_free(id);
 776        id->areas = new_areas;
 777        id->nr_areas = nr_areas;
 778        id->pages_per_area = pages_per_area;
 779        id->active_area = 0;
 780        memset(id->active_entries,0,sizeof(int)*id->nr_areas);
 781        memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
 782        spin_unlock_irqrestore(&id->lock,flags);
 783        printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
 784                         ,id->name, pages_per_area);
 785out:
 786        return rc;
 787}
 788
 789/*
 790 * debug_set_level:
 791 * - set actual debug level
 792 */
 793
 794void
 795debug_set_level(debug_info_t* id, int new_level)
 796{
 797        unsigned long flags;
 798        if(!id)
 799                return; 
 800        spin_lock_irqsave(&id->lock,flags);
 801        if(new_level == DEBUG_OFF_LEVEL){
 802                id->level = DEBUG_OFF_LEVEL;
 803                printk(KERN_INFO "debug: %s: switched off\n",id->name);
 804        } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
 805                printk(KERN_INFO
 806                        "debug: %s: level %i is out of range (%i - %i)\n",
 807                        id->name, new_level, 0, DEBUG_MAX_LEVEL);
 808        } else {
 809                id->level = new_level;
 810        }
 811        spin_unlock_irqrestore(&id->lock,flags);
 812}
 813
 814
 815/*
 816 * proceed_active_entry:
 817 * - set active entry to next in the ring buffer
 818 */
 819
 820static inline void
 821proceed_active_entry(debug_info_t * id)
 822{
 823        if ((id->active_entries[id->active_area] += id->entry_size)
 824            > (PAGE_SIZE - id->entry_size)){
 825                id->active_entries[id->active_area] = 0;
 826                id->active_pages[id->active_area] =
 827                        (id->active_pages[id->active_area] + 1) %
 828                        id->pages_per_area;
 829        }
 830}
 831
 832/*
 833 * proceed_active_area:
 834 * - set active area to next in the ring buffer
 835 */
 836
 837static inline void
 838proceed_active_area(debug_info_t * id)
 839{
 840        id->active_area++;
 841        id->active_area = id->active_area % id->nr_areas;
 842}
 843
 844/*
 845 * get_active_entry:
 846 */
 847
 848static inline debug_entry_t*
 849get_active_entry(debug_info_t * id)
 850{
 851        return (debug_entry_t *) (((char *) id->areas[id->active_area]
 852                                        [id->active_pages[id->active_area]]) +
 853                                        id->active_entries[id->active_area]);
 854}
 855
 856/*
 857 * debug_finish_entry:
 858 * - set timestamp, caller address, cpu number etc.
 859 */
 860
 861static inline void
 862debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
 863                        int exception)
 864{
 865        active->id.stck = get_clock();
 866        active->id.fields.cpuid = smp_processor_id();
 867        active->caller = __builtin_return_address(0);
 868        active->id.fields.exception = exception;
 869        active->id.fields.level     = level;
 870        proceed_active_entry(id);
 871        if(exception)
 872                proceed_active_area(id);
 873}
 874
 875static int debug_stoppable=1;
 876static int debug_active=1;
 877
 878#define CTL_S390DBF_STOPPABLE 5678
 879#define CTL_S390DBF_ACTIVE 5679
 880
 881/*
 882 * proc handler for the running debug_active sysctl
 883 * always allow read, allow write only if debug_stoppable is set or
 884 * if debug_active is already off
 885 */
 886static int
 887s390dbf_procactive(ctl_table *table, int write, struct file *filp,
 888                     void __user *buffer, size_t *lenp, loff_t *ppos)
 889{
 890        if (!write || debug_stoppable || !debug_active)
 891                return proc_dointvec(table, write, filp, buffer, lenp, ppos);
 892        else
 893                return 0;
 894}
 895
 896
 897static struct ctl_table s390dbf_table[] = {
 898        {
 899                .ctl_name       = CTL_S390DBF_STOPPABLE,
 900                .procname       = "debug_stoppable",
 901                .data           = &debug_stoppable,
 902                .maxlen         = sizeof(int),
 903                .mode           = S_IRUGO | S_IWUSR,
 904                .proc_handler   = &proc_dointvec,
 905                .strategy       = &sysctl_intvec,
 906        },
 907         {
 908                .ctl_name       = CTL_S390DBF_ACTIVE,
 909                .procname       = "debug_active",
 910                .data           = &debug_active,
 911                .maxlen         = sizeof(int),
 912                .mode           = S_IRUGO | S_IWUSR,
 913                .proc_handler   = &s390dbf_procactive,
 914                .strategy       = &sysctl_intvec,
 915        },
 916        { .ctl_name = 0 }
 917};
 918
 919static struct ctl_table s390dbf_dir_table[] = {
 920        {
 921                .ctl_name       = CTL_S390DBF,
 922                .procname       = "s390dbf",
 923                .maxlen         = 0,
 924                .mode           = S_IRUGO | S_IXUGO,
 925                .child          = s390dbf_table,
 926        },
 927        { .ctl_name = 0 }
 928};
 929
 930static struct ctl_table_header *s390dbf_sysctl_header;
 931
 932void
 933debug_stop_all(void)
 934{
 935        if (debug_stoppable)
 936                debug_active = 0;
 937}
 938
 939
 940/*
 941 * debug_event_common:
 942 * - write debug entry with given size
 943 */
 944
 945debug_entry_t*
 946debug_event_common(debug_info_t * id, int level, const void *buf, int len)
 947{
 948        unsigned long flags;
 949        debug_entry_t *active;
 950
 951        if (!debug_active || !id->areas)
 952                return NULL;
 953        spin_lock_irqsave(&id->lock, flags);
 954        active = get_active_entry(id);
 955        memset(DEBUG_DATA(active), 0, id->buf_size);
 956        memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 957        debug_finish_entry(id, active, level, 0);
 958        spin_unlock_irqrestore(&id->lock, flags);
 959
 960        return active;
 961}
 962
 963/*
 964 * debug_exception_common:
 965 * - write debug entry with given size and switch to next debug area
 966 */
 967
 968debug_entry_t
 969*debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
 970{
 971        unsigned long flags;
 972        debug_entry_t *active;
 973
 974        if (!debug_active || !id->areas)
 975                return NULL;
 976        spin_lock_irqsave(&id->lock, flags);
 977        active = get_active_entry(id);
 978        memset(DEBUG_DATA(active), 0, id->buf_size);
 979        memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 980        debug_finish_entry(id, active, level, 1);
 981        spin_unlock_irqrestore(&id->lock, flags);
 982
 983        return active;
 984}
 985
 986/*
 987 * counts arguments in format string for sprintf view
 988 */
 989
 990static inline int
 991debug_count_numargs(char *string)
 992{
 993        int numargs=0;
 994
 995        while(*string) {
 996                if(*string++=='%')
 997                        numargs++;
 998        }
 999        return(numargs);
1000}
1001
1002/*
1003 * debug_sprintf_event:
1004 */
1005
1006debug_entry_t*
1007debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1008{
1009        va_list   ap;
1010        int numargs,idx;
1011        unsigned long flags;
1012        debug_sprintf_entry_t *curr_event;
1013        debug_entry_t *active;
1014
1015        if((!id) || (level > id->level))
1016                return NULL;
1017        if (!debug_active || !id->areas)
1018                return NULL;
1019        numargs=debug_count_numargs(string);
1020
1021        spin_lock_irqsave(&id->lock, flags);
1022        active = get_active_entry(id);
1023        curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1024        va_start(ap,string);
1025        curr_event->string=string;
1026        for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1027                curr_event->args[idx]=va_arg(ap,long);
1028        va_end(ap);
1029        debug_finish_entry(id, active, level, 0);
1030        spin_unlock_irqrestore(&id->lock, flags);
1031
1032        return active;
1033}
1034
1035/*
1036 * debug_sprintf_exception:
1037 */
1038
1039debug_entry_t*
1040debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1041{
1042        va_list   ap;
1043        int numargs,idx;
1044        unsigned long flags;
1045        debug_sprintf_entry_t *curr_event;
1046        debug_entry_t *active;
1047
1048        if((!id) || (level > id->level))
1049                return NULL;
1050        if (!debug_active || !id->areas)
1051                return NULL;
1052
1053        numargs=debug_count_numargs(string);
1054
1055        spin_lock_irqsave(&id->lock, flags);
1056        active = get_active_entry(id);
1057        curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1058        va_start(ap,string);
1059        curr_event->string=string;
1060        for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1061                curr_event->args[idx]=va_arg(ap,long);
1062        va_end(ap);
1063        debug_finish_entry(id, active, level, 1);
1064        spin_unlock_irqrestore(&id->lock, flags);
1065
1066        return active;
1067}
1068
1069/*
1070 * debug_init:
1071 * - is called exactly once to initialize the debug feature
1072 */
1073
1074static int
1075__init debug_init(void)
1076{
1077        int rc = 0;
1078
1079        s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1080        mutex_lock(&debug_mutex);
1081        debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1082        initialized = 1;
1083        mutex_unlock(&debug_mutex);
1084
1085        return rc;
1086}
1087
1088/*
1089 * debug_register_view:
1090 */
1091
1092int
1093debug_register_view(debug_info_t * id, struct debug_view *view)
1094{
1095        int rc = 0;
1096        int i;
1097        unsigned long flags;
1098        mode_t mode;
1099        struct dentry *pde;
1100
1101        if (!id)
1102                goto out;
1103        mode = (id->mode | S_IFREG) & ~S_IXUGO;
1104        if (!(view->prolog_proc || view->format_proc || view->header_proc))
1105                mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1106        if (!view->input_proc)
1107                mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1108        pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1109                                id , &debug_file_ops);
1110        if (!pde){
1111                printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1112                        " Cannot register view %s/%s\n", id->name,view->name);
1113                rc = -1;
1114                goto out;
1115        }
1116        spin_lock_irqsave(&id->lock, flags);
1117        for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1118                if (!id->views[i])
1119                        break;
1120        }
1121        if (i == DEBUG_MAX_VIEWS) {
1122                printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1123                        id->name,view->name);
1124                printk(KERN_WARNING 
1125                        "debug: maximum number of views reached (%i)!\n", i);
1126                debugfs_remove(pde);
1127                rc = -1;
1128        } else {
1129                id->views[i] = view;
1130                id->debugfs_entries[i] = pde;
1131        }
1132        spin_unlock_irqrestore(&id->lock, flags);
1133out:
1134        return rc;
1135}
1136
1137/*
1138 * debug_unregister_view:
1139 */
1140
1141int
1142debug_unregister_view(debug_info_t * id, struct debug_view *view)
1143{
1144        int rc = 0;
1145        int i;
1146        unsigned long flags;
1147
1148        if (!id)
1149                goto out;
1150        spin_lock_irqsave(&id->lock, flags);
1151        for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1152                if (id->views[i] == view)
1153                        break;
1154        }
1155        if (i == DEBUG_MAX_VIEWS)
1156                rc = -1;
1157        else {
1158                debugfs_remove(id->debugfs_entries[i]);
1159                id->views[i] = NULL;
1160                rc = 0;
1161        }
1162        spin_unlock_irqrestore(&id->lock, flags);
1163out:
1164        return rc;
1165}
1166
1167static inline char *
1168debug_get_user_string(const char __user *user_buf, size_t user_len)
1169{
1170        char* buffer;
1171
1172        buffer = kmalloc(user_len + 1, GFP_KERNEL);
1173        if (!buffer)
1174                return ERR_PTR(-ENOMEM);
1175        if (copy_from_user(buffer, user_buf, user_len) != 0) {
1176                kfree(buffer);
1177                return ERR_PTR(-EFAULT);
1178        }
1179        /* got the string, now strip linefeed. */
1180        if (buffer[user_len - 1] == '\n')
1181                buffer[user_len - 1] = 0;
1182        else
1183                buffer[user_len] = 0;
1184        return buffer;
1185}
1186
1187static inline int
1188debug_get_uint(char *buf)
1189{
1190        int rc;
1191
1192        for(; isspace(*buf); buf++);
1193        rc = simple_strtoul(buf, &buf, 10);
1194        if(*buf){
1195                rc = -EINVAL;
1196        }
1197        return rc;
1198}
1199
1200/*
1201 * functions for debug-views
1202 ***********************************
1203*/
1204
1205/*
1206 * prints out actual debug level
1207 */
1208
1209static int
1210debug_prolog_pages_fn(debug_info_t * id,
1211                                 struct debug_view *view, char *out_buf)
1212{
1213        return sprintf(out_buf, "%i\n", id->pages_per_area);
1214}
1215
1216/*
1217 * reads new size (number of pages per debug area)
1218 */
1219
1220static int
1221debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1222                        struct file *file, const char __user *user_buf,
1223                        size_t user_len, loff_t * offset)
1224{
1225        char *str;
1226        int rc,new_pages;
1227
1228        if (user_len > 0x10000)
1229                user_len = 0x10000;
1230        if (*offset != 0){
1231                rc = -EPIPE;
1232                goto out;
1233        }
1234        str = debug_get_user_string(user_buf,user_len);
1235        if(IS_ERR(str)){
1236                rc = PTR_ERR(str);
1237                goto out;
1238        }
1239        new_pages = debug_get_uint(str);
1240        if(new_pages < 0){
1241                rc = -EINVAL;
1242                goto free_str;
1243        }
1244        rc = debug_set_size(id,id->nr_areas, new_pages);
1245        if(rc != 0){
1246                rc = -EINVAL;
1247                goto free_str;
1248        }
1249        rc = user_len;
1250free_str:
1251        kfree(str);
1252out:
1253        *offset += user_len;
1254        return rc;              /* number of input characters */
1255}
1256
1257/*
1258 * prints out actual debug level
1259 */
1260
1261static int
1262debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1263{
1264        int rc = 0;
1265
1266        if(id->level == DEBUG_OFF_LEVEL) {
1267                rc = sprintf(out_buf,"-\n");
1268        }
1269        else {
1270                rc = sprintf(out_buf, "%i\n", id->level);
1271        }
1272        return rc;
1273}
1274
1275/*
1276 * reads new debug level
1277 */
1278
1279static int
1280debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1281                        struct file *file, const char __user *user_buf,
1282                        size_t user_len, loff_t * offset)
1283{
1284        char *str;
1285        int rc,new_level;
1286
1287        if (user_len > 0x10000)
1288                user_len = 0x10000;
1289        if (*offset != 0){
1290                rc = -EPIPE;
1291                goto out;
1292        }
1293        str = debug_get_user_string(user_buf,user_len);
1294        if(IS_ERR(str)){
1295                rc = PTR_ERR(str);
1296                goto out;
1297        }
1298        if(str[0] == '-'){
1299                debug_set_level(id, DEBUG_OFF_LEVEL);
1300                rc = user_len;
1301                goto free_str;
1302        } else {
1303                new_level = debug_get_uint(str);
1304        }
1305        if(new_level < 0) {
1306                printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1307                rc = -EINVAL;
1308        } else {
1309                debug_set_level(id, new_level);
1310                rc = user_len;
1311        }
1312free_str:
1313        kfree(str);
1314out:
1315        *offset += user_len;
1316        return rc;              /* number of input characters */
1317}
1318
1319
1320/*
1321 * flushes debug areas
1322 */
1323 
1324static void debug_flush(debug_info_t* id, int area)
1325{
1326        unsigned long flags;
1327        int i,j;
1328
1329        if(!id || !id->areas)
1330                return;
1331        spin_lock_irqsave(&id->lock,flags);
1332        if(area == DEBUG_FLUSH_ALL){
1333                id->active_area = 0;
1334                memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1335                for (i = 0; i < id->nr_areas; i++) {
1336                        id->active_pages[i] = 0;
1337                        for(j = 0; j < id->pages_per_area; j++) {
1338                                memset(id->areas[i][j], 0, PAGE_SIZE);
1339                        }
1340                }
1341        } else if(area >= 0 && area < id->nr_areas) {
1342                id->active_entries[area] = 0;
1343                id->active_pages[area] = 0;
1344                for(i = 0; i < id->pages_per_area; i++) {
1345                        memset(id->areas[area][i],0,PAGE_SIZE);
1346                }
1347        }
1348        spin_unlock_irqrestore(&id->lock,flags);
1349}
1350
1351/*
1352 * view function: flushes debug areas 
1353 */
1354
1355static int
1356debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1357                        struct file *file, const char __user *user_buf,
1358                        size_t user_len, loff_t * offset)
1359{
1360        char input_buf[1];
1361        int rc = user_len;
1362
1363        if (user_len > 0x10000)
1364                user_len = 0x10000;
1365        if (*offset != 0){
1366                rc = -EPIPE;
1367                goto out;
1368        }
1369        if (copy_from_user(input_buf, user_buf, 1)){
1370                rc = -EFAULT;
1371                goto out;
1372        }
1373        if(input_buf[0] == '-') { 
1374                debug_flush(id, DEBUG_FLUSH_ALL);
1375                goto out;
1376        }
1377        if (isdigit(input_buf[0])) {
1378                int area = ((int) input_buf[0] - (int) '0');
1379                debug_flush(id, area);
1380                goto out;
1381        }
1382
1383        printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1384
1385out:
1386        *offset += user_len;
1387        return rc;              /* number of input characters */
1388}
1389
1390/*
1391 * prints debug header in raw format
1392 */
1393
1394static int
1395debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1396                        int area, debug_entry_t * entry, char *out_buf)
1397{
1398        int rc;
1399
1400        rc = sizeof(debug_entry_t);
1401        memcpy(out_buf,entry,sizeof(debug_entry_t));
1402        return rc;
1403}
1404
1405/*
1406 * prints debug data in raw format
1407 */
1408
1409static int
1410debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1411                               char *out_buf, const char *in_buf)
1412{
1413        int rc;
1414
1415        rc = id->buf_size;
1416        memcpy(out_buf, in_buf, id->buf_size);
1417        return rc;
1418}
1419
1420/*
1421 * prints debug data in hex/ascii format
1422 */
1423
1424static int
1425debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1426                          char *out_buf, const char *in_buf)
1427{
1428        int i, rc = 0;
1429
1430        for (i = 0; i < id->buf_size; i++) {
1431                rc += sprintf(out_buf + rc, "%02x ",
1432                              ((unsigned char *) in_buf)[i]);
1433        }
1434        rc += sprintf(out_buf + rc, "| ");
1435        for (i = 0; i < id->buf_size; i++) {
1436                unsigned char c = in_buf[i];
1437                if (!isprint(c))
1438                        rc += sprintf(out_buf + rc, ".");
1439                else
1440                        rc += sprintf(out_buf + rc, "%c", c);
1441        }
1442        rc += sprintf(out_buf + rc, "\n");
1443        return rc;
1444}
1445
1446/*
1447 * prints header for debug entry
1448 */
1449
1450int
1451debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1452                         int area, debug_entry_t * entry, char *out_buf)
1453{
1454        struct timespec time_spec;
1455        unsigned long long time;
1456        char *except_str;
1457        unsigned long caller;
1458        int rc = 0;
1459        unsigned int level;
1460
1461        level = entry->id.fields.level;
1462        time = entry->id.stck;
1463        /* adjust todclock to 1970 */
1464        time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1465        tod_to_timeval(time, &time_spec);
1466
1467        if (entry->id.fields.exception)
1468                except_str = "*";
1469        else
1470                except_str = "-";
1471        caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1472        rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1473                      area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1474                      except_str, entry->id.fields.cpuid, (void *) caller);
1475        return rc;
1476}
1477
1478/*
1479 * prints debug data sprintf-formated:
1480 * debug_sprinf_event/exception calls must be used together with this view
1481 */
1482
1483#define DEBUG_SPRINTF_MAX_ARGS 10
1484
1485static int
1486debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1487                        char *out_buf, debug_sprintf_entry_t *curr_event)
1488{
1489        int num_longs, num_used_args = 0,i, rc = 0;
1490        int index[DEBUG_SPRINTF_MAX_ARGS];
1491
1492        /* count of longs fit into one entry */
1493        num_longs = id->buf_size /  sizeof(long); 
1494
1495        if(num_longs < 1)
1496                goto out; /* bufsize of entry too small */
1497        if(num_longs == 1) {
1498                /* no args, we use only the string */
1499                strcpy(out_buf, curr_event->string);
1500                rc = strlen(curr_event->string);
1501                goto out;
1502        }
1503
1504        /* number of arguments used for sprintf (without the format string) */
1505        num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1506
1507        memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1508
1509        for(i = 0; i < num_used_args; i++)
1510                index[i] = i;
1511
1512        rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1513                curr_event->args[index[1]], curr_event->args[index[2]],
1514                curr_event->args[index[3]], curr_event->args[index[4]],
1515                curr_event->args[index[5]], curr_event->args[index[6]],
1516                curr_event->args[index[7]], curr_event->args[index[8]],
1517                curr_event->args[index[9]]);
1518
1519out:
1520
1521        return rc;
1522}
1523
1524/*
1525 * clean up module
1526 */
1527static void __exit debug_exit(void)
1528{
1529        debugfs_remove(debug_debugfs_root_entry);
1530        unregister_sysctl_table(s390dbf_sysctl_header);
1531        return;
1532}
1533
1534/*
1535 * module definitions
1536 */
1537postcore_initcall(debug_init);
1538module_exit(debug_exit);
1539MODULE_LICENSE("GPL");
1540
1541EXPORT_SYMBOL(debug_register);
1542EXPORT_SYMBOL(debug_unregister); 
1543EXPORT_SYMBOL(debug_set_level);
1544EXPORT_SYMBOL(debug_stop_all);
1545EXPORT_SYMBOL(debug_register_view);
1546EXPORT_SYMBOL(debug_unregister_view);
1547EXPORT_SYMBOL(debug_event_common);
1548EXPORT_SYMBOL(debug_exception_common);
1549EXPORT_SYMBOL(debug_hex_ascii_view);
1550EXPORT_SYMBOL(debug_raw_view);
1551EXPORT_SYMBOL(debug_dflt_header_fn);
1552EXPORT_SYMBOL(debug_sprintf_view);
1553EXPORT_SYMBOL(debug_sprintf_exception);
1554EXPORT_SYMBOL(debug_sprintf_event);
1555