git.oblomov.eu Git - linux-2.6/blob - arch/s390/kernel/debug.c

   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/config.h>
  14 #include <linux/stddef.h>
  15 #include <linux/kernel.h>
  16 #include <linux/errno.h>
  17 #include <linux/slab.h>
  18 #include <linux/ctype.h>
  19 #include <linux/sysctl.h>
  20 #include <asm/uaccess.h>
  21 #include <asm/semaphore.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/fs.h>
  25 #include <linux/debugfs.h>
  26
  27 #include <asm/debug.h>
  28
  29 #define DEBUG_PROLOG_ENTRY -1
  30
  31 #define ALL_AREAS 0 /* copy all debug areas */
  32 #define NO_AREAS  1 /* copy no debug areas */
  33
  34 /* typedefs */
  35
  36 typedef struct file_private_info {
  37         loff_t offset;                  /* offset of last read in file */
  38         int    act_area;                /* number of last formated area */
  39         int    act_page;                /* act page in given area */
  40         int    act_entry;               /* last formated entry (offset */
  41                                         /* relative to beginning of last */
  42                                         /* formated page) */
  43         size_t act_entry_offset;        /* up to this offset we copied */
  44                                         /* in last read the last formated */
  45                                         /* entry to userland */
  46         char   temp_buf[2048];          /* buffer for output */
  47         debug_info_t *debug_info_org;   /* original debug information */
  48         debug_info_t *debug_info_snap;  /* snapshot of debug information */
  49         struct debug_view *view;        /* used view of debug info */
  50 } file_private_info_t;
  51
  52 typedef struct
  53 {
  54         char *string;
  55         /*
  56          * This assumes that all args are converted into longs
  57          * on L/390 this is the case for all types of parameter
  58          * except of floats, and long long (32 bit)
  59          *
  60          */
  61         long args[0];
  62 } debug_sprintf_entry_t;
  63
  64
  65 extern void tod_to_timeval(uint64_t todval, struct timeval *xtime);
  66
  67 /* internal function prototyes */
  68
  69 static int debug_init(void);
  70 static ssize_t debug_output(struct file *file, char __user *user_buf,
  71                         size_t user_len, loff_t * offset);
  72 static ssize_t debug_input(struct file *file, const char __user *user_buf,
  73                         size_t user_len, loff_t * offset);
  74 static int debug_open(struct inode *inode, struct file *file);
  75 static int debug_close(struct inode *inode, struct file *file);
  76 static debug_info_t*  debug_info_create(char *name, int pages_per_area,
  77                         int nr_areas, int buf_size);
  78 static void debug_info_get(debug_info_t *);
  79 static void debug_info_put(debug_info_t *);
  80 static int debug_prolog_level_fn(debug_info_t * id,
  81                         struct debug_view *view, char *out_buf);
  82 static int debug_input_level_fn(debug_info_t * id, struct debug_view *view,
  83                         struct file *file, const char __user *user_buf,
  84                         size_t user_buf_size, loff_t * offset);
  85 static int debug_prolog_pages_fn(debug_info_t * id,
  86                         struct debug_view *view, char *out_buf);
  87 static int debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
  88                         struct file *file, const char __user *user_buf,
  89                         size_t user_buf_size, loff_t * offset);
  90 static int debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
  91                         struct file *file, const char __user *user_buf,
  92                         size_t user_buf_size, loff_t * offset);
  93 static int debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
  94                         char *out_buf, const char *in_buf);
  95 static int debug_raw_format_fn(debug_info_t * id,
  96                         struct debug_view *view, char *out_buf,
  97                         const char *in_buf);
  98 static int debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
  99                         int area, debug_entry_t * entry, char *out_buf);
 100
 101 static int debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
 102                         char *out_buf, debug_sprintf_entry_t *curr_event);
 103
 104 /* globals */
 105
 106 struct debug_view debug_raw_view = {
 107         "raw",
 108         NULL,
 109         &debug_raw_header_fn,
 110         &debug_raw_format_fn,
 111         NULL,
 112         NULL
 113 };
 114
 115 struct debug_view debug_hex_ascii_view = {
 116         "hex_ascii",
 117         NULL,
 118         &debug_dflt_header_fn,
 119         &debug_hex_ascii_format_fn,
 120         NULL,
 121         NULL
 122 };
 123
 124 struct debug_view debug_level_view = {
 125         "level",
 126         &debug_prolog_level_fn,
 127         NULL,
 128         NULL,
 129         &debug_input_level_fn,
 130         NULL
 131 };
 132
 133 struct debug_view debug_pages_view = {
 134         "pages",
 135         &debug_prolog_pages_fn,
 136         NULL,
 137         NULL,
 138         &debug_input_pages_fn,
 139         NULL
 140 };
 141
 142 struct debug_view debug_flush_view = {
 143         "flush",
 144         NULL,
 145         NULL,
 146         NULL,
 147         &debug_input_flush_fn,
 148         NULL
 149 };
 150
 151 struct debug_view debug_sprintf_view = {
 152         "sprintf",
 153         NULL,
 154         &debug_dflt_header_fn,
 155         (debug_format_proc_t*)&debug_sprintf_format_fn,
 156         NULL,
 157         NULL
 158 };
 159
 160
 161 unsigned int debug_feature_version = __DEBUG_FEATURE_VERSION;
 162
 163 /* static globals */
 164
 165 static debug_info_t *debug_area_first = NULL;
 166 static debug_info_t *debug_area_last = NULL;
 167 DECLARE_MUTEX(debug_lock);
 168
 169 static int initialized;
 170
 171 static struct file_operations debug_file_ops = {
 172         .owner   = THIS_MODULE,
 173         .read    = debug_output,
 174         .write   = debug_input,
 175         .open    = debug_open,
 176         .release = debug_close,
 177 };
 178
 179 static struct dentry *debug_debugfs_root_entry;
 180
 181 /* functions */
 182
 183 /*
 184  * debug_areas_alloc
 185  * - Debug areas are implemented as a threedimensonal array:
 186  *   areas[areanumber][pagenumber][pageoffset]
 187  */
 188
 189 static debug_entry_t***
 190 debug_areas_alloc(int pages_per_area, int nr_areas)
 191 {
 192         debug_entry_t*** areas;
 193         int i,j;
 194
 195         areas = (debug_entry_t ***) kmalloc(nr_areas *
 196                                         sizeof(debug_entry_t**),
 197                                         GFP_KERNEL);
 198         if (!areas)
 199                 goto fail_malloc_areas;
 200         for (i = 0; i < nr_areas; i++) {
 201                 areas[i] = (debug_entry_t**) kmalloc(pages_per_area *
 202                                 sizeof(debug_entry_t*),GFP_KERNEL);
 203                 if (!areas[i]) {
 204                         goto fail_malloc_areas2;
 205                 }
 206                 for(j = 0; j < pages_per_area; j++) {
 207                         areas[i][j] = (debug_entry_t*)kmalloc(PAGE_SIZE,
 208                                                 GFP_KERNEL);
 209                         if(!areas[i][j]) {
 210                                 for(j--; j >=0 ; j--) {
 211                                         kfree(areas[i][j]);
 212                                 }
 213                                 kfree(areas[i]);
 214                                 goto fail_malloc_areas2;
 215                         } else {
 216                                 memset(areas[i][j],0,PAGE_SIZE);
 217                         }
 218                 }
 219         }
 220         return areas;
 221
 222 fail_malloc_areas2:
 223         for(i--; i >= 0; i--){
 224                 for(j=0; j < pages_per_area;j++){
 225                         kfree(areas[i][j]);
 226                 }
 227                 kfree(areas[i]);
 228         }
 229         kfree(areas);
 230 fail_malloc_areas:
 231         return NULL;
 232
 233 }
 234
 235
 236 /*
 237  * debug_info_alloc
 238  * - alloc new debug-info
 239  */
 240
 241 static debug_info_t*
 242 debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size,
 243                 int level, int mode)
 244 {
 245         debug_info_t* rc;
 246
 247         /* alloc everything */
 248
 249         rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_KERNEL);
 250         if(!rc)
 251                 goto fail_malloc_rc;
 252         rc->active_entries = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL);
 253         if(!rc->active_entries)
 254                 goto fail_malloc_active_entries;
 255         memset(rc->active_entries, 0, nr_areas * sizeof(int));
 256         rc->active_pages = (int*)kmalloc(nr_areas * sizeof(int), GFP_KERNEL);
 257         if(!rc->active_pages)
 258                 goto fail_malloc_active_pages;
 259         memset(rc->active_pages, 0, nr_areas * sizeof(int));
 260         if((mode == ALL_AREAS) && (pages_per_area != 0)){
 261                 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
 262                 if(!rc->areas)
 263                         goto fail_malloc_areas;
 264         } else {
 265                 rc->areas = NULL;
 266         }
 267
 268         /* initialize members */
 269
 270         spin_lock_init(&rc->lock);
 271         rc->pages_per_area = pages_per_area;
 272         rc->nr_areas       = nr_areas;
 273         rc->active_area    = 0;
 274         rc->level          = level;
 275         rc->buf_size       = buf_size;
 276         rc->entry_size     = sizeof(debug_entry_t) + buf_size;
 277         strlcpy(rc->name, name, sizeof(rc->name)-1);
 278         memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
 279         memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
 280                 sizeof(struct dentry*));
 281         atomic_set(&(rc->ref_count), 0);
 282
 283         return rc;
 284
 285 fail_malloc_areas:
 286         kfree(rc->active_pages);
 287 fail_malloc_active_pages:
 288         kfree(rc->active_entries);
 289 fail_malloc_active_entries:
 290         kfree(rc);
 291 fail_malloc_rc:
 292         return NULL;
 293 }
 294
 295 /*
 296  * debug_areas_free
 297  * - free all debug areas
 298  */
 299
 300 static void
 301 debug_areas_free(debug_info_t* db_info)
 302 {
 303         int i,j;
 304
 305         if(!db_info->areas)
 306                 return;
 307         for (i = 0; i < db_info->nr_areas; i++) {
 308                 for(j = 0; j < db_info->pages_per_area; j++) {
 309                         kfree(db_info->areas[i][j]);
 310                 }
 311                 kfree(db_info->areas[i]);
 312         }
 313         kfree(db_info->areas);
 314         db_info->areas = NULL;
 315 }
 316
 317 /*
 318  * debug_info_free
 319  * - free memory debug-info
 320  */
 321
 322 static void
 323 debug_info_free(debug_info_t* db_info){
 324         debug_areas_free(db_info);
 325         kfree(db_info->active_entries);
 326         kfree(db_info->active_pages);
 327         kfree(db_info);
 328 }
 329
 330 /*
 331  * debug_info_create
 332  * - create new debug-info
 333  */
 334
 335 static debug_info_t*
 336 debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size)
 337 {
 338         debug_info_t* rc;
 339
 340         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
 341                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
 342         if(!rc)
 343                 goto out;
 344
 345         /* create root directory */
 346         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
 347                                         debug_debugfs_root_entry);
 348
 349         /* append new element to linked list */
 350         if (!debug_area_first) {
 351                 /* first element in list */
 352                 debug_area_first = rc;
 353                 rc->prev = NULL;
 354         } else {
 355                 /* append element to end of list */
 356                 debug_area_last->next = rc;
 357                 rc->prev = debug_area_last;
 358         }
 359         debug_area_last = rc;
 360         rc->next = NULL;
 361
 362         debug_info_get(rc);
 363 out:
 364         return rc;
 365 }
 366
 367 /*
 368  * debug_info_copy
 369  * - copy debug-info
 370  */
 371
 372 static debug_info_t*
 373 debug_info_copy(debug_info_t* in, int mode)
 374 {
 375         int i,j;
 376         debug_info_t* rc;
 377
 378         rc = debug_info_alloc(in->name, in->pages_per_area, in->nr_areas,
 379                                 in->buf_size, in->level, mode);
 380         if(!rc || (mode == NO_AREAS))
 381                 goto out;
 382
 383         for(i = 0; i < in->nr_areas; i++){
 384                 for(j = 0; j < in->pages_per_area; j++) {
 385                         memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
 386                 }
 387         }
 388 out:
 389         return rc;
 390 }
 391
 392 /*
 393  * debug_info_get
 394  * - increments reference count for debug-info
 395  */
 396
 397 static void
 398 debug_info_get(debug_info_t * db_info)
 399 {
 400         if (db_info)
 401                 atomic_inc(&db_info->ref_count);
 402 }
 403
 404 /*
 405  * debug_info_put:
 406  * - decreases reference count for debug-info and frees it if necessary
 407  */
 408
 409 static void
 410 debug_info_put(debug_info_t *db_info)
 411 {
 412         int i;
 413
 414         if (!db_info)
 415                 return;
 416         if (atomic_dec_and_test(&db_info->ref_count)) {
 417                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 418                         if (!db_info->views[i])
 419                                 continue;
 420                         debugfs_remove(db_info->debugfs_entries[i]);
 421                 }
 422                 debugfs_remove(db_info->debugfs_root_entry);
 423                 if(db_info == debug_area_first)
 424                         debug_area_first = db_info->next;
 425                 if(db_info == debug_area_last)
 426                         debug_area_last = db_info->prev;
 427                 if(db_info->prev) db_info->prev->next = db_info->next;
 428                 if(db_info->next) db_info->next->prev = db_info->prev;
 429                 debug_info_free(db_info);
 430         }
 431 }
 432
 433 /*
 434  * debug_format_entry:
 435  * - format one debug entry and return size of formated data
 436  */
 437
 438 static int
 439 debug_format_entry(file_private_info_t *p_info)
 440 {
 441         debug_info_t *id_snap   = p_info->debug_info_snap;
 442         struct debug_view *view = p_info->view;
 443         debug_entry_t *act_entry;
 444         size_t len = 0;
 445         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 446                 /* print prolog */
 447                 if (view->prolog_proc)
 448                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
 449                 goto out;
 450         }
 451         if (!id_snap->areas) /* this is true, if we have a prolog only view */
 452                 goto out;    /* or if 'pages_per_area' is 0 */
 453         act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
 454                                 [p_info->act_page] + p_info->act_entry);
 455
 456         if (act_entry->id.stck == 0LL)
 457                         goto out;  /* empty entry */
 458         if (view->header_proc)
 459                 len += view->header_proc(id_snap, view, p_info->act_area,
 460                                         act_entry, p_info->temp_buf + len);
 461         if (view->format_proc)
 462                 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
 463                                                 DEBUG_DATA(act_entry));
 464 out:
 465         return len;
 466 }
 467
 468 /*
 469  * debug_next_entry:
 470  * - goto next entry in p_info
 471  */
 472
 473 extern inline int
 474 debug_next_entry(file_private_info_t *p_info)
 475 {
 476         debug_info_t *id;
 477
 478         id = p_info->debug_info_snap;
 479         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 480                 p_info->act_entry = 0;
 481                 p_info->act_page  = 0;
 482                 goto out;
 483         }
 484         if(!id->areas)
 485                 return 1;
 486         p_info->act_entry += id->entry_size;
 487         /* switch to next page, if we reached the end of the page  */
 488         if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
 489                 /* next page */
 490                 p_info->act_entry = 0;
 491                 p_info->act_page += 1;
 492                 if((p_info->act_page % id->pages_per_area) == 0) {
 493                         /* next area */
 494                         p_info->act_area++;
 495                         p_info->act_page=0;
 496                 }
 497                 if(p_info->act_area >= id->nr_areas)
 498                         return 1;
 499         }
 500 out:
 501         return 0;
 502 }
 503
 504 /*
 505  * debug_output:
 506  * - called for user read()
 507  * - copies formated debug entries to the user buffer
 508  */
 509
 510 static ssize_t
 511 debug_output(struct file *file,         /* file descriptor */
 512             char __user *user_buf,      /* user buffer */
 513             size_t  len,                /* length of buffer */
 514             loff_t *offset)             /* offset in the file */
 515 {
 516         size_t count = 0;
 517         size_t entry_offset;
 518         file_private_info_t *p_info;
 519
 520         p_info = ((file_private_info_t *) file->private_data);
 521         if (*offset != p_info->offset)
 522                 return -EPIPE;
 523         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
 524                 return 0;
 525         entry_offset = p_info->act_entry_offset;
 526         while(count < len){
 527                 int formatted_line_size;
 528                 int formatted_line_residue;
 529                 int user_buf_residue;
 530                 size_t copy_size;
 531
 532                 formatted_line_size = debug_format_entry(p_info);
 533                 formatted_line_residue = formatted_line_size - entry_offset;
 534                 user_buf_residue = len-count;
 535                 copy_size = min(user_buf_residue, formatted_line_residue);
 536                 if(copy_size){
 537                         if (copy_to_user(user_buf + count, p_info->temp_buf
 538                                         + entry_offset, copy_size))
 539                                 return -EFAULT;
 540                         count += copy_size;
 541                         entry_offset += copy_size;
 542                 }
 543                 if(copy_size == formatted_line_residue){
 544                         entry_offset = 0;
 545                         if(debug_next_entry(p_info))
 546                                 goto out;
 547                 }
 548         }
 549 out:
 550         p_info->offset           = *offset + count;
 551         p_info->act_entry_offset = entry_offset;
 552         *offset = p_info->offset;
 553         return count;
 554 }
 555
 556 /*
 557  * debug_input:
 558  * - called for user write()
 559  * - calls input function of view
 560  */
 561
 562 static ssize_t
 563 debug_input(struct file *file, const char __user *user_buf, size_t length,
 564                 loff_t *offset)
 565 {
 566         int rc = 0;
 567         file_private_info_t *p_info;
 568
 569         down(&debug_lock);
 570         p_info = ((file_private_info_t *) file->private_data);
 571         if (p_info->view->input_proc)
 572                 rc = p_info->view->input_proc(p_info->debug_info_org,
 573                                               p_info->view, file, user_buf,
 574                                               length, offset);
 575         else
 576                 rc = -EPERM;
 577         up(&debug_lock);
 578         return rc;              /* number of input characters */
 579 }
 580
 581 /*
 582  * debug_open:
 583  * - called for user open()
 584  * - copies formated output to private_data area of the file
 585  *   handle
 586  */
 587
 588 static int
 589 debug_open(struct inode *inode, struct file *file)
 590 {
 591         int i = 0, rc = 0;
 592         file_private_info_t *p_info;
 593         debug_info_t *debug_info, *debug_info_snapshot;
 594
 595         down(&debug_lock);
 596
 597         /* find debug log and view */
 598         debug_info = debug_area_first;
 599         while(debug_info != NULL){
 600                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 601                         if (!debug_info->views[i])
 602                                 continue;
 603                         else if (debug_info->debugfs_entries[i] ==
 604                                  file->f_dentry) {
 605                                 goto found;     /* found view ! */
 606                         }
 607                 }
 608                 debug_info = debug_info->next;
 609         }
 610         /* no entry found */
 611         rc = -EINVAL;
 612         goto out;
 613
 614 found:
 615
 616         /* Make snapshot of current debug areas to get it consistent.     */
 617         /* To copy all the areas is only needed, if we have a view which  */
 618         /* formats the debug areas. */
 619
 620         if(!debug_info->views[i]->format_proc &&
 621                 !debug_info->views[i]->header_proc){
 622                 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
 623         } else {
 624                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
 625         }
 626
 627         if(!debug_info_snapshot){
 628                 rc = -ENOMEM;
 629                 goto out;
 630         }
 631         p_info = (file_private_info_t *) kmalloc(sizeof(file_private_info_t),
 632                                                 GFP_KERNEL);
 633         if(!p_info){
 634                 if(debug_info_snapshot)
 635                         debug_info_free(debug_info_snapshot);
 636                 rc = -ENOMEM;
 637                 goto out;
 638         }
 639         p_info->offset = 0;
 640         p_info->debug_info_snap = debug_info_snapshot;
 641         p_info->debug_info_org  = debug_info;
 642         p_info->view = debug_info->views[i];
 643         p_info->act_area = 0;
 644         p_info->act_page = 0;
 645         p_info->act_entry = DEBUG_PROLOG_ENTRY;
 646         p_info->act_entry_offset = 0;
 647         file->private_data = p_info;
 648         debug_info_get(debug_info);
 649 out:
 650         up(&debug_lock);
 651         return rc;
 652 }
 653
 654 /*
 655  * debug_close:
 656  * - called for user close()
 657  * - deletes  private_data area of the file handle
 658  */
 659
 660 static int
 661 debug_close(struct inode *inode, struct file *file)
 662 {
 663         file_private_info_t *p_info;
 664         p_info = (file_private_info_t *) file->private_data;
 665         if(p_info->debug_info_snap)
 666                 debug_info_free(p_info->debug_info_snap);
 667         debug_info_put(p_info->debug_info_org);
 668         kfree(file->private_data);
 669         return 0;               /* success */
 670 }
 671
 672 /*
 673  * debug_register:
 674  * - creates and initializes debug area for the caller
 675  * - returns handle for debug area
 676  */
 677
 678 debug_info_t*
 679 debug_register (char *name, int pages_per_area, int nr_areas, int buf_size)
 680 {
 681         debug_info_t *rc = NULL;
 682
 683         if (!initialized)
 684                 BUG();
 685         down(&debug_lock);
 686
 687         /* create new debug_info */
 688
 689         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size);
 690         if(!rc)
 691                 goto out;
 692         debug_register_view(rc, &debug_level_view);
 693         debug_register_view(rc, &debug_flush_view);
 694         debug_register_view(rc, &debug_pages_view);
 695 out:
 696         if (!rc){
 697                 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
 698         }
 699         up(&debug_lock);
 700         return rc;
 701 }
 702
 703 /*
 704  * debug_unregister:
 705  * - give back debug area
 706  */
 707
 708 void
 709 debug_unregister(debug_info_t * id)
 710 {
 711         if (!id)
 712                 goto out;
 713         down(&debug_lock);
 714         debug_info_put(id);
 715         up(&debug_lock);
 716
 717 out:
 718         return;
 719 }
 720
 721 /*
 722  * debug_set_size:
 723  * - set area size (number of pages) and number of areas
 724  */
 725 static int
 726 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
 727 {
 728         unsigned long flags;
 729         debug_entry_t *** new_areas;
 730         int rc=0;
 731
 732         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
 733                 return -EINVAL;
 734         if(pages_per_area > 0){
 735                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
 736                 if(!new_areas) {
 737                         printk(KERN_WARNING "debug: could not allocate memory "\
 738                                          "for pagenumber: %i\n",pages_per_area);
 739                         rc = -ENOMEM;
 740                         goto out;
 741                 }
 742         } else {
 743                 new_areas = NULL;
 744         }
 745         spin_lock_irqsave(&id->lock,flags);
 746         debug_areas_free(id);
 747         id->areas = new_areas;
 748         id->nr_areas = nr_areas;
 749         id->pages_per_area = pages_per_area;
 750         id->active_area = 0;
 751         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
 752         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
 753         spin_unlock_irqrestore(&id->lock,flags);
 754         printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
 755                          ,id->name, pages_per_area);
 756 out:
 757         return rc;
 758 }
 759
 760 /*
 761  * debug_set_level:
 762  * - set actual debug level
 763  */
 764
 765 void
 766 debug_set_level(debug_info_t* id, int new_level)
 767 {
 768         unsigned long flags;
 769         if(!id)
 770                 return;
 771         spin_lock_irqsave(&id->lock,flags);
 772         if(new_level == DEBUG_OFF_LEVEL){
 773                 id->level = DEBUG_OFF_LEVEL;
 774                 printk(KERN_INFO "debug: %s: switched off\n",id->name);
 775         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
 776                 printk(KERN_INFO
 777                         "debug: %s: level %i is out of range (%i - %i)\n",
 778                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
 779         } else {
 780                 id->level = new_level;
 781         }
 782         spin_unlock_irqrestore(&id->lock,flags);
 783 }
 784
 785
 786 /*
 787  * proceed_active_entry:
 788  * - set active entry to next in the ring buffer
 789  */
 790
 791 extern inline void
 792 proceed_active_entry(debug_info_t * id)
 793 {
 794         if ((id->active_entries[id->active_area] += id->entry_size)
 795             > (PAGE_SIZE - id->entry_size)){
 796                 id->active_entries[id->active_area] = 0;
 797                 id->active_pages[id->active_area] =
 798                         (id->active_pages[id->active_area] + 1) %
 799                         id->pages_per_area;
 800         }
 801 }
 802
 803 /*
 804  * proceed_active_area:
 805  * - set active area to next in the ring buffer
 806  */
 807
 808 extern inline void
 809 proceed_active_area(debug_info_t * id)
 810 {
 811         id->active_area++;
 812         id->active_area = id->active_area % id->nr_areas;
 813 }
 814
 815 /*
 816  * get_active_entry:
 817  */
 818
 819 extern inline debug_entry_t*
 820 get_active_entry(debug_info_t * id)
 821 {
 822         return (debug_entry_t *) (((char *) id->areas[id->active_area]
 823                                         [id->active_pages[id->active_area]]) +
 824                                         id->active_entries[id->active_area]);
 825 }
 826
 827 /*
 828  * debug_finish_entry:
 829  * - set timestamp, caller address, cpu number etc.
 830  */
 831
 832 extern inline void
 833 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
 834                         int exception)
 835 {
 836         STCK(active->id.stck);
 837         active->id.fields.cpuid = smp_processor_id();
 838         active->caller = __builtin_return_address(0);
 839         active->id.fields.exception = exception;
 840         active->id.fields.level     = level;
 841         proceed_active_entry(id);
 842         if(exception)
 843                 proceed_active_area(id);
 844 }
 845
 846 static int debug_stoppable=1;
 847 static int debug_active=1;
 848
 849 #define CTL_S390DBF 5677
 850 #define CTL_S390DBF_STOPPABLE 5678
 851 #define CTL_S390DBF_ACTIVE 5679
 852
 853 /*
 854  * proc handler for the running debug_active sysctl
 855  * always allow read, allow write only if debug_stoppable is set or
 856  * if debug_active is already off
 857  */
 858 static int
 859 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
 860                      void __user *buffer, size_t *lenp, loff_t *ppos)
 861 {
 862         if (!write || debug_stoppable || !debug_active)
 863                 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
 864         else
 865                 return 0;
 866 }
 867
 868
 869 static struct ctl_table s390dbf_table[] = {
 870         {
 871                 .ctl_name       = CTL_S390DBF_STOPPABLE,
 872                 .procname       = "debug_stoppable",
 873                 .data           = &debug_stoppable,
 874                 .maxlen         = sizeof(int),
 875                 .mode           = S_IRUGO | S_IWUSR,
 876                 .proc_handler   = &proc_dointvec,
 877                 .strategy       = &sysctl_intvec,
 878         },
 879          {
 880                 .ctl_name       = CTL_S390DBF_ACTIVE,
 881                 .procname       = "debug_active",
 882                 .data           = &debug_active,
 883                 .maxlen         = sizeof(int),
 884                 .mode           = S_IRUGO | S_IWUSR,
 885                 .proc_handler   = &s390dbf_procactive,
 886                 .strategy       = &sysctl_intvec,
 887         },
 888         { .ctl_name = 0 }
 889 };
 890
 891 static struct ctl_table s390dbf_dir_table[] = {
 892         {
 893                 .ctl_name       = CTL_S390DBF,
 894                 .procname       = "s390dbf",
 895                 .maxlen         = 0,
 896                 .mode           = S_IRUGO | S_IXUGO,
 897                 .child          = s390dbf_table,
 898         },
 899         { .ctl_name = 0 }
 900 };
 901
 902 struct ctl_table_header *s390dbf_sysctl_header;
 903
 904 void
 905 debug_stop_all(void)
 906 {
 907         if (debug_stoppable)
 908                 debug_active = 0;
 909 }
 910
 911
 912 /*
 913  * debug_event_common:
 914  * - write debug entry with given size
 915  */
 916
 917 debug_entry_t*
 918 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
 919 {
 920         unsigned long flags;
 921         debug_entry_t *active;
 922
 923         if (!debug_active || !id->areas)
 924                 return NULL;
 925         spin_lock_irqsave(&id->lock, flags);
 926         active = get_active_entry(id);
 927         memset(DEBUG_DATA(active), 0, id->buf_size);
 928         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 929         debug_finish_entry(id, active, level, 0);
 930         spin_unlock_irqrestore(&id->lock, flags);
 931
 932         return active;
 933 }
 934
 935 /*
 936  * debug_exception_common:
 937  * - write debug entry with given size and switch to next debug area
 938  */
 939
 940 debug_entry_t
 941 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
 942 {
 943         unsigned long flags;
 944         debug_entry_t *active;
 945
 946         if (!debug_active || !id->areas)
 947                 return NULL;
 948         spin_lock_irqsave(&id->lock, flags);
 949         active = get_active_entry(id);
 950         memset(DEBUG_DATA(active), 0, id->buf_size);
 951         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 952         debug_finish_entry(id, active, level, 1);
 953         spin_unlock_irqrestore(&id->lock, flags);
 954
 955         return active;
 956 }
 957
 958 /*
 959  * counts arguments in format string for sprintf view
 960  */
 961
 962 extern inline int
 963 debug_count_numargs(char *string)
 964 {
 965         int numargs=0;
 966
 967         while(*string) {
 968                 if(*string++=='%')
 969                         numargs++;
 970         }
 971         return(numargs);
 972 }
 973
 974 /*
 975  * debug_sprintf_event:
 976  */
 977
 978 debug_entry_t*
 979 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
 980 {
 981         va_list   ap;
 982         int numargs,idx;
 983         unsigned long flags;
 984         debug_sprintf_entry_t *curr_event;
 985         debug_entry_t *active;
 986
 987         if((!id) || (level > id->level))
 988                 return NULL;
 989         if (!debug_active || !id->areas)
 990                 return NULL;
 991         numargs=debug_count_numargs(string);
 992
 993         spin_lock_irqsave(&id->lock, flags);
 994         active = get_active_entry(id);
 995         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
 996         va_start(ap,string);
 997         curr_event->string=string;
 998         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
 999                 curr_event->args[idx]=va_arg(ap,long);
1000         va_end(ap);
1001         debug_finish_entry(id, active, level, 0);
1002         spin_unlock_irqrestore(&id->lock, flags);
1003
1004         return active;
1005 }
1006
1007 /*
1008  * debug_sprintf_exception:
1009  */
1010
1011 debug_entry_t*
1012 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1013 {
1014         va_list   ap;
1015         int numargs,idx;
1016         unsigned long flags;
1017         debug_sprintf_entry_t *curr_event;
1018         debug_entry_t *active;
1019
1020         if((!id) || (level > id->level))
1021                 return NULL;
1022         if (!debug_active || !id->areas)
1023                 return NULL;
1024
1025         numargs=debug_count_numargs(string);
1026
1027         spin_lock_irqsave(&id->lock, flags);
1028         active = get_active_entry(id);
1029         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1030         va_start(ap,string);
1031         curr_event->string=string;
1032         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1033                 curr_event->args[idx]=va_arg(ap,long);
1034         va_end(ap);
1035         debug_finish_entry(id, active, level, 1);
1036         spin_unlock_irqrestore(&id->lock, flags);
1037
1038         return active;
1039 }
1040
1041 /*
1042  * debug_init:
1043  * - is called exactly once to initialize the debug feature
1044  */
1045
1046 static int
1047 __init debug_init(void)
1048 {
1049         int rc = 0;
1050
1051         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 1);
1052         down(&debug_lock);
1053         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1054         printk(KERN_INFO "debug: Initialization complete\n");
1055         initialized = 1;
1056         up(&debug_lock);
1057
1058         return rc;
1059 }
1060
1061 /*
1062  * debug_register_view:
1063  */
1064
1065 int
1066 debug_register_view(debug_info_t * id, struct debug_view *view)
1067 {
1068         int rc = 0;
1069         int i;
1070         unsigned long flags;
1071         mode_t mode = S_IFREG;
1072         struct dentry *pde;
1073
1074         if (!id)
1075                 goto out;
1076         if (view->prolog_proc || view->format_proc || view->header_proc)
1077                 mode |= S_IRUSR;
1078         if (view->input_proc)
1079                 mode |= S_IWUSR;
1080         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1081                                 NULL, &debug_file_ops);
1082         if (!pde){
1083                 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1084                         " Cannot register view %s/%s\n", id->name,view->name);
1085                 rc = -1;
1086                 goto out;
1087         }
1088         spin_lock_irqsave(&id->lock, flags);
1089         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1090                 if (!id->views[i])
1091                         break;
1092         }
1093         if (i == DEBUG_MAX_VIEWS) {
1094                 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1095                         id->name,view->name);
1096                 printk(KERN_WARNING
1097                         "debug: maximum number of views reached (%i)!\n", i);
1098                 debugfs_remove(pde);
1099                 rc = -1;
1100         } else {
1101                 id->views[i] = view;
1102                 id->debugfs_entries[i] = pde;
1103         }
1104         spin_unlock_irqrestore(&id->lock, flags);
1105 out:
1106         return rc;
1107 }
1108
1109 /*
1110  * debug_unregister_view:
1111  */
1112
1113 int
1114 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1115 {
1116         int rc = 0;
1117         int i;
1118         unsigned long flags;
1119
1120         if (!id)
1121                 goto out;
1122         spin_lock_irqsave(&id->lock, flags);
1123         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1124                 if (id->views[i] == view)
1125                         break;
1126         }
1127         if (i == DEBUG_MAX_VIEWS)
1128                 rc = -1;
1129         else {
1130                 debugfs_remove(id->debugfs_entries[i]);
1131                 id->views[i] = NULL;
1132                 rc = 0;
1133         }
1134         spin_unlock_irqrestore(&id->lock, flags);
1135 out:
1136         return rc;
1137 }
1138
1139 static inline char *
1140 debug_get_user_string(const char __user *user_buf, size_t user_len)
1141 {
1142         char* buffer;
1143
1144         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1145         if (!buffer)
1146                 return ERR_PTR(-ENOMEM);
1147         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1148                 kfree(buffer);
1149                 return ERR_PTR(-EFAULT);
1150         }
1151         /* got the string, now strip linefeed. */
1152         if (buffer[user_len - 1] == '\n')
1153                 buffer[user_len - 1] = 0;
1154         else
1155                 buffer[user_len] = 0;
1156         return buffer;
1157 }
1158
1159 static inline int
1160 debug_get_uint(char *buf)
1161 {
1162         int rc;
1163
1164         for(; isspace(*buf); buf++);
1165         rc = simple_strtoul(buf, &buf, 10);
1166         if(*buf){
1167                 printk("debug: no integer specified!\n");
1168                 rc = -EINVAL;
1169         }
1170         return rc;
1171 }
1172
1173 /*
1174  * functions for debug-views
1175  ***********************************
1176 */
1177
1178 /*
1179  * prints out actual debug level
1180  */
1181
1182 static int
1183 debug_prolog_pages_fn(debug_info_t * id,
1184                                  struct debug_view *view, char *out_buf)
1185 {
1186         return sprintf(out_buf, "%i\n", id->pages_per_area);
1187 }
1188
1189 /*
1190  * reads new size (number of pages per debug area)
1191  */
1192
1193 static int
1194 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1195                         struct file *file, const char __user *user_buf,
1196                         size_t user_len, loff_t * offset)
1197 {
1198         char *str;
1199         int rc,new_pages;
1200
1201         if (user_len > 0x10000)
1202                 user_len = 0x10000;
1203         if (*offset != 0){
1204                 rc = -EPIPE;
1205                 goto out;
1206         }
1207         str = debug_get_user_string(user_buf,user_len);
1208         if(IS_ERR(str)){
1209                 rc = PTR_ERR(str);
1210                 goto out;
1211         }
1212         new_pages = debug_get_uint(str);
1213         if(new_pages < 0){
1214                 rc = -EINVAL;
1215                 goto free_str;
1216         }
1217         rc = debug_set_size(id,id->nr_areas, new_pages);
1218         if(rc != 0){
1219                 rc = -EINVAL;
1220                 goto free_str;
1221         }
1222         rc = user_len;
1223 free_str:
1224         kfree(str);
1225 out:
1226         *offset += user_len;
1227         return rc;              /* number of input characters */
1228 }
1229
1230 /*
1231  * prints out actual debug level
1232  */
1233
1234 static int
1235 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1236 {
1237         int rc = 0;
1238
1239         if(id->level == DEBUG_OFF_LEVEL) {
1240                 rc = sprintf(out_buf,"-\n");
1241         }
1242         else {
1243                 rc = sprintf(out_buf, "%i\n", id->level);
1244         }
1245         return rc;
1246 }
1247
1248 /*
1249  * reads new debug level
1250  */
1251
1252 static int
1253 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1254                         struct file *file, const char __user *user_buf,
1255                         size_t user_len, loff_t * offset)
1256 {
1257         char *str;
1258         int rc,new_level;
1259
1260         if (user_len > 0x10000)
1261                 user_len = 0x10000;
1262         if (*offset != 0){
1263                 rc = -EPIPE;
1264                 goto out;
1265         }
1266         str = debug_get_user_string(user_buf,user_len);
1267         if(IS_ERR(str)){
1268                 rc = PTR_ERR(str);
1269                 goto out;
1270         }
1271         if(str[0] == '-'){
1272                 debug_set_level(id, DEBUG_OFF_LEVEL);
1273                 rc = user_len;
1274                 goto free_str;
1275         } else {
1276                 new_level = debug_get_uint(str);
1277         }
1278         if(new_level < 0) {
1279                 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1280                 rc = -EINVAL;
1281         } else {
1282                 debug_set_level(id, new_level);
1283                 rc = user_len;
1284         }
1285 free_str:
1286         kfree(str);
1287 out:
1288         *offset += user_len;
1289         return rc;              /* number of input characters */
1290 }
1291
1292
1293 /*
1294  * flushes debug areas
1295  */
1296
1297 void
1298 debug_flush(debug_info_t* id, int area)
1299 {
1300         unsigned long flags;
1301         int i,j;
1302
1303         if(!id || !id->areas)
1304                 return;
1305         spin_lock_irqsave(&id->lock,flags);
1306         if(area == DEBUG_FLUSH_ALL){
1307                 id->active_area = 0;
1308                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1309                 for (i = 0; i < id->nr_areas; i++) {
1310                         id->active_pages[i] = 0;
1311                         for(j = 0; j < id->pages_per_area; j++) {
1312                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1313                         }
1314                 }
1315                 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1316         } else if(area >= 0 && area < id->nr_areas) {
1317                 id->active_entries[area] = 0;
1318                 id->active_pages[area] = 0;
1319                 for(i = 0; i < id->pages_per_area; i++) {
1320                         memset(id->areas[area][i],0,PAGE_SIZE);
1321                 }
1322                 printk(KERN_INFO "debug: %s: area %i has been flushed\n",
1323                         id->name, area);
1324         } else {
1325                 printk(KERN_INFO
1326                       "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1327                         id->name, area, 0, id->nr_areas-1);
1328         }
1329         spin_unlock_irqrestore(&id->lock,flags);
1330 }
1331
1332 /*
1333  * view function: flushes debug areas
1334  */
1335
1336 static int
1337 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1338                         struct file *file, const char __user *user_buf,
1339                         size_t user_len, loff_t * offset)
1340 {
1341         char input_buf[1];
1342         int rc = user_len;
1343
1344         if (user_len > 0x10000)
1345                 user_len = 0x10000;
1346         if (*offset != 0){
1347                 rc = -EPIPE;
1348                 goto out;
1349         }
1350         if (copy_from_user(input_buf, user_buf, 1)){
1351                 rc = -EFAULT;
1352                 goto out;
1353         }
1354         if(input_buf[0] == '-') {
1355                 debug_flush(id, DEBUG_FLUSH_ALL);
1356                 goto out;
1357         }
1358         if (isdigit(input_buf[0])) {
1359                 int area = ((int) input_buf[0] - (int) '0');
1360                 debug_flush(id, area);
1361                 goto out;
1362         }
1363
1364         printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1365
1366 out:
1367         *offset += user_len;
1368         return rc;              /* number of input characters */
1369 }
1370
1371 /*
1372  * prints debug header in raw format
1373  */
1374
1375 static int
1376 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1377                         int area, debug_entry_t * entry, char *out_buf)
1378 {
1379         int rc;
1380
1381         rc = sizeof(debug_entry_t);
1382         memcpy(out_buf,entry,sizeof(debug_entry_t));
1383         return rc;
1384 }
1385
1386 /*
1387  * prints debug data in raw format
1388  */
1389
1390 static int
1391 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1392                                char *out_buf, const char *in_buf)
1393 {
1394         int rc;
1395
1396         rc = id->buf_size;
1397         memcpy(out_buf, in_buf, id->buf_size);
1398         return rc;
1399 }
1400
1401 /*
1402  * prints debug data in hex/ascii format
1403  */
1404
1405 static int
1406 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1407                           char *out_buf, const char *in_buf)
1408 {
1409         int i, rc = 0;
1410
1411         for (i = 0; i < id->buf_size; i++) {
1412                 rc += sprintf(out_buf + rc, "%02x ",
1413                               ((unsigned char *) in_buf)[i]);
1414         }
1415         rc += sprintf(out_buf + rc, "| ");
1416         for (i = 0; i < id->buf_size; i++) {
1417                 unsigned char c = in_buf[i];
1418                 if (!isprint(c))
1419                         rc += sprintf(out_buf + rc, ".");
1420                 else
1421                         rc += sprintf(out_buf + rc, "%c", c);
1422         }
1423         rc += sprintf(out_buf + rc, "\n");
1424         return rc;
1425 }
1426
1427 /*
1428  * prints header for debug entry
1429  */
1430
1431 int
1432 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1433                          int area, debug_entry_t * entry, char *out_buf)
1434 {
1435         struct timeval time_val;
1436         unsigned long long time;
1437         char *except_str;
1438         unsigned long caller;
1439         int rc = 0;
1440         unsigned int level;
1441
1442         level = entry->id.fields.level;
1443         time = entry->id.stck;
1444         /* adjust todclock to 1970 */
1445         time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1446         tod_to_timeval(time, &time_val);
1447
1448         if (entry->id.fields.exception)
1449                 except_str = "*";
1450         else
1451                 except_str = "-";
1452         caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1453         rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1454                       area, time_val.tv_sec, time_val.tv_usec, level,
1455                       except_str, entry->id.fields.cpuid, (void *) caller);
1456         return rc;
1457 }
1458
1459 /*
1460  * prints debug data sprintf-formated:
1461  * debug_sprinf_event/exception calls must be used together with this view
1462  */
1463
1464 #define DEBUG_SPRINTF_MAX_ARGS 10
1465
1466 static int
1467 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1468                         char *out_buf, debug_sprintf_entry_t *curr_event)
1469 {
1470         int num_longs, num_used_args = 0,i, rc = 0;
1471         int index[DEBUG_SPRINTF_MAX_ARGS];
1472
1473         /* count of longs fit into one entry */
1474         num_longs = id->buf_size /  sizeof(long);
1475
1476         if(num_longs < 1)
1477                 goto out; /* bufsize of entry too small */
1478         if(num_longs == 1) {
1479                 /* no args, we use only the string */
1480                 strcpy(out_buf, curr_event->string);
1481                 rc = strlen(curr_event->string);
1482                 goto out;
1483         }
1484
1485         /* number of arguments used for sprintf (without the format string) */
1486         num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1487
1488         memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1489
1490         for(i = 0; i < num_used_args; i++)
1491                 index[i] = i;
1492
1493         rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1494                 curr_event->args[index[1]], curr_event->args[index[2]],
1495                 curr_event->args[index[3]], curr_event->args[index[4]],
1496                 curr_event->args[index[5]], curr_event->args[index[6]],
1497                 curr_event->args[index[7]], curr_event->args[index[8]],
1498                 curr_event->args[index[9]]);
1499
1500 out:
1501
1502         return rc;
1503 }
1504
1505 /*
1506  * clean up module
1507  */
1508 void
1509 __exit debug_exit(void)
1510 {
1511         debugfs_remove(debug_debugfs_root_entry);
1512         unregister_sysctl_table(s390dbf_sysctl_header);
1513         return;
1514 }
1515
1516 /*
1517  * module definitions
1518  */
1519 postcore_initcall(debug_init);
1520 module_exit(debug_exit);
1521 MODULE_LICENSE("GPL");
1522
1523 EXPORT_SYMBOL(debug_register);
1524 EXPORT_SYMBOL(debug_unregister);
1525 EXPORT_SYMBOL(debug_set_level);
1526 EXPORT_SYMBOL(debug_stop_all);
1527 EXPORT_SYMBOL(debug_register_view);
1528 EXPORT_SYMBOL(debug_unregister_view);
1529 EXPORT_SYMBOL(debug_event_common);
1530 EXPORT_SYMBOL(debug_exception_common);
1531 EXPORT_SYMBOL(debug_hex_ascii_view);
1532 EXPORT_SYMBOL(debug_raw_view);
1533 EXPORT_SYMBOL(debug_dflt_header_fn);
1534 EXPORT_SYMBOL(debug_sprintf_view);
1535 EXPORT_SYMBOL(debug_sprintf_exception);
1536 EXPORT_SYMBOL(debug_sprintf_event);