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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/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 timespec *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] = kzalloc(PAGE_SIZE, GFP_KERNEL);
 208                         if(!areas[i][j]) {
 209                                 for(j--; j >=0 ; j--) {
 210                                         kfree(areas[i][j]);
 211                                 }
 212                                 kfree(areas[i]);
 213                                 goto fail_malloc_areas2;
 214                         }
 215                 }
 216         }
 217         return areas;
 218
 219 fail_malloc_areas2:
 220         for(i--; i >= 0; i--){
 221                 for(j=0; j < pages_per_area;j++){
 222                         kfree(areas[i][j]);
 223                 }
 224                 kfree(areas[i]);
 225         }
 226         kfree(areas);
 227 fail_malloc_areas:
 228         return NULL;
 229
 230 }
 231
 232
 233 /*
 234  * debug_info_alloc
 235  * - alloc new debug-info
 236  */
 237
 238 static debug_info_t*
 239 debug_info_alloc(char *name, int pages_per_area, int nr_areas, int buf_size,
 240                 int level, int mode)
 241 {
 242         debug_info_t* rc;
 243
 244         /* alloc everything */
 245
 246         rc = (debug_info_t*) kmalloc(sizeof(debug_info_t), GFP_KERNEL);
 247         if(!rc)
 248                 goto fail_malloc_rc;
 249         rc->active_entries = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
 250         if(!rc->active_entries)
 251                 goto fail_malloc_active_entries;
 252         rc->active_pages = kcalloc(nr_areas, sizeof(int), GFP_KERNEL);
 253         if(!rc->active_pages)
 254                 goto fail_malloc_active_pages;
 255         if((mode == ALL_AREAS) && (pages_per_area != 0)){
 256                 rc->areas = debug_areas_alloc(pages_per_area, nr_areas);
 257                 if(!rc->areas)
 258                         goto fail_malloc_areas;
 259         } else {
 260                 rc->areas = NULL;
 261         }
 262
 263         /* initialize members */
 264
 265         spin_lock_init(&rc->lock);
 266         rc->pages_per_area = pages_per_area;
 267         rc->nr_areas       = nr_areas;
 268         rc->active_area    = 0;
 269         rc->level          = level;
 270         rc->buf_size       = buf_size;
 271         rc->entry_size     = sizeof(debug_entry_t) + buf_size;
 272         strlcpy(rc->name, name, sizeof(rc->name)-1);
 273         memset(rc->views, 0, DEBUG_MAX_VIEWS * sizeof(struct debug_view *));
 274         memset(rc->debugfs_entries, 0 ,DEBUG_MAX_VIEWS *
 275                 sizeof(struct dentry*));
 276         atomic_set(&(rc->ref_count), 0);
 277
 278         return rc;
 279
 280 fail_malloc_areas:
 281         kfree(rc->active_pages);
 282 fail_malloc_active_pages:
 283         kfree(rc->active_entries);
 284 fail_malloc_active_entries:
 285         kfree(rc);
 286 fail_malloc_rc:
 287         return NULL;
 288 }
 289
 290 /*
 291  * debug_areas_free
 292  * - free all debug areas
 293  */
 294
 295 static void
 296 debug_areas_free(debug_info_t* db_info)
 297 {
 298         int i,j;
 299
 300         if(!db_info->areas)
 301                 return;
 302         for (i = 0; i < db_info->nr_areas; i++) {
 303                 for(j = 0; j < db_info->pages_per_area; j++) {
 304                         kfree(db_info->areas[i][j]);
 305                 }
 306                 kfree(db_info->areas[i]);
 307         }
 308         kfree(db_info->areas);
 309         db_info->areas = NULL;
 310 }
 311
 312 /*
 313  * debug_info_free
 314  * - free memory debug-info
 315  */
 316
 317 static void
 318 debug_info_free(debug_info_t* db_info){
 319         debug_areas_free(db_info);
 320         kfree(db_info->active_entries);
 321         kfree(db_info->active_pages);
 322         kfree(db_info);
 323 }
 324
 325 /*
 326  * debug_info_create
 327  * - create new debug-info
 328  */
 329
 330 static debug_info_t*
 331 debug_info_create(char *name, int pages_per_area, int nr_areas, int buf_size)
 332 {
 333         debug_info_t* rc;
 334
 335         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
 336                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
 337         if(!rc)
 338                 goto out;
 339
 340         /* create root directory */
 341         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
 342                                         debug_debugfs_root_entry);
 343
 344         /* append new element to linked list */
 345         if (!debug_area_first) {
 346                 /* first element in list */
 347                 debug_area_first = rc;
 348                 rc->prev = NULL;
 349         } else {
 350                 /* append element to end of list */
 351                 debug_area_last->next = rc;
 352                 rc->prev = debug_area_last;
 353         }
 354         debug_area_last = rc;
 355         rc->next = NULL;
 356
 357         debug_info_get(rc);
 358 out:
 359         return rc;
 360 }
 361
 362 /*
 363  * debug_info_copy
 364  * - copy debug-info
 365  */
 366
 367 static debug_info_t*
 368 debug_info_copy(debug_info_t* in, int mode)
 369 {
 370         int i,j;
 371         debug_info_t* rc;
 372         unsigned long flags;
 373
 374         /* get a consistent copy of the debug areas */
 375         do {
 376                 rc = debug_info_alloc(in->name, in->pages_per_area,
 377                         in->nr_areas, in->buf_size, in->level, mode);
 378                 spin_lock_irqsave(&in->lock, flags);
 379                 if(!rc)
 380                         goto out;
 381                 /* has something changed in the meantime ? */
 382                 if((rc->pages_per_area == in->pages_per_area) &&
 383                    (rc->nr_areas == in->nr_areas)) {
 384                         break;
 385                 }
 386                 spin_unlock_irqrestore(&in->lock, flags);
 387                 debug_info_free(rc);
 388         } while (1);
 389
 390         if(!rc || (mode == NO_AREAS))
 391                 goto out;
 392
 393         for(i = 0; i < in->nr_areas; i++){
 394                 for(j = 0; j < in->pages_per_area; j++) {
 395                         memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
 396                 }
 397         }
 398 out:
 399         spin_unlock_irqrestore(&in->lock, flags);
 400         return rc;
 401 }
 402
 403 /*
 404  * debug_info_get
 405  * - increments reference count for debug-info
 406  */
 407
 408 static void
 409 debug_info_get(debug_info_t * db_info)
 410 {
 411         if (db_info)
 412                 atomic_inc(&db_info->ref_count);
 413 }
 414
 415 /*
 416  * debug_info_put:
 417  * - decreases reference count for debug-info and frees it if necessary
 418  */
 419
 420 static void
 421 debug_info_put(debug_info_t *db_info)
 422 {
 423         int i;
 424
 425         if (!db_info)
 426                 return;
 427         if (atomic_dec_and_test(&db_info->ref_count)) {
 428                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 429                         if (!db_info->views[i])
 430                                 continue;
 431                         debugfs_remove(db_info->debugfs_entries[i]);
 432                 }
 433                 debugfs_remove(db_info->debugfs_root_entry);
 434                 if(db_info == debug_area_first)
 435                         debug_area_first = db_info->next;
 436                 if(db_info == debug_area_last)
 437                         debug_area_last = db_info->prev;
 438                 if(db_info->prev) db_info->prev->next = db_info->next;
 439                 if(db_info->next) db_info->next->prev = db_info->prev;
 440                 debug_info_free(db_info);
 441         }
 442 }
 443
 444 /*
 445  * debug_format_entry:
 446  * - format one debug entry and return size of formated data
 447  */
 448
 449 static int
 450 debug_format_entry(file_private_info_t *p_info)
 451 {
 452         debug_info_t *id_snap   = p_info->debug_info_snap;
 453         struct debug_view *view = p_info->view;
 454         debug_entry_t *act_entry;
 455         size_t len = 0;
 456         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 457                 /* print prolog */
 458                 if (view->prolog_proc)
 459                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
 460                 goto out;
 461         }
 462         if (!id_snap->areas) /* this is true, if we have a prolog only view */
 463                 goto out;    /* or if 'pages_per_area' is 0 */
 464         act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
 465                                 [p_info->act_page] + p_info->act_entry);
 466
 467         if (act_entry->id.stck == 0LL)
 468                         goto out;  /* empty entry */
 469         if (view->header_proc)
 470                 len += view->header_proc(id_snap, view, p_info->act_area,
 471                                         act_entry, p_info->temp_buf + len);
 472         if (view->format_proc)
 473                 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
 474                                                 DEBUG_DATA(act_entry));
 475 out:
 476         return len;
 477 }
 478
 479 /*
 480  * debug_next_entry:
 481  * - goto next entry in p_info
 482  */
 483
 484 static inline int
 485 debug_next_entry(file_private_info_t *p_info)
 486 {
 487         debug_info_t *id;
 488
 489         id = p_info->debug_info_snap;
 490         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 491                 p_info->act_entry = 0;
 492                 p_info->act_page  = 0;
 493                 goto out;
 494         }
 495         if(!id->areas)
 496                 return 1;
 497         p_info->act_entry += id->entry_size;
 498         /* switch to next page, if we reached the end of the page  */
 499         if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
 500                 /* next page */
 501                 p_info->act_entry = 0;
 502                 p_info->act_page += 1;
 503                 if((p_info->act_page % id->pages_per_area) == 0) {
 504                         /* next area */
 505                         p_info->act_area++;
 506                         p_info->act_page=0;
 507                 }
 508                 if(p_info->act_area >= id->nr_areas)
 509                         return 1;
 510         }
 511 out:
 512         return 0;
 513 }
 514
 515 /*
 516  * debug_output:
 517  * - called for user read()
 518  * - copies formated debug entries to the user buffer
 519  */
 520
 521 static ssize_t
 522 debug_output(struct file *file,         /* file descriptor */
 523             char __user *user_buf,      /* user buffer */
 524             size_t  len,                /* length of buffer */
 525             loff_t *offset)             /* offset in the file */
 526 {
 527         size_t count = 0;
 528         size_t entry_offset;
 529         file_private_info_t *p_info;
 530
 531         p_info = ((file_private_info_t *) file->private_data);
 532         if (*offset != p_info->offset)
 533                 return -EPIPE;
 534         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
 535                 return 0;
 536         entry_offset = p_info->act_entry_offset;
 537         while(count < len){
 538                 int formatted_line_size;
 539                 int formatted_line_residue;
 540                 int user_buf_residue;
 541                 size_t copy_size;
 542
 543                 formatted_line_size = debug_format_entry(p_info);
 544                 formatted_line_residue = formatted_line_size - entry_offset;
 545                 user_buf_residue = len-count;
 546                 copy_size = min(user_buf_residue, formatted_line_residue);
 547                 if(copy_size){
 548                         if (copy_to_user(user_buf + count, p_info->temp_buf
 549                                         + entry_offset, copy_size))
 550                                 return -EFAULT;
 551                         count += copy_size;
 552                         entry_offset += copy_size;
 553                 }
 554                 if(copy_size == formatted_line_residue){
 555                         entry_offset = 0;
 556                         if(debug_next_entry(p_info))
 557                                 goto out;
 558                 }
 559         }
 560 out:
 561         p_info->offset           = *offset + count;
 562         p_info->act_entry_offset = entry_offset;
 563         *offset = p_info->offset;
 564         return count;
 565 }
 566
 567 /*
 568  * debug_input:
 569  * - called for user write()
 570  * - calls input function of view
 571  */
 572
 573 static ssize_t
 574 debug_input(struct file *file, const char __user *user_buf, size_t length,
 575                 loff_t *offset)
 576 {
 577         int rc = 0;
 578         file_private_info_t *p_info;
 579
 580         down(&debug_lock);
 581         p_info = ((file_private_info_t *) file->private_data);
 582         if (p_info->view->input_proc)
 583                 rc = p_info->view->input_proc(p_info->debug_info_org,
 584                                               p_info->view, file, user_buf,
 585                                               length, offset);
 586         else
 587                 rc = -EPERM;
 588         up(&debug_lock);
 589         return rc;              /* number of input characters */
 590 }
 591
 592 /*
 593  * debug_open:
 594  * - called for user open()
 595  * - copies formated output to private_data area of the file
 596  *   handle
 597  */
 598
 599 static int
 600 debug_open(struct inode *inode, struct file *file)
 601 {
 602         int i = 0, rc = 0;
 603         file_private_info_t *p_info;
 604         debug_info_t *debug_info, *debug_info_snapshot;
 605
 606         down(&debug_lock);
 607         debug_info = (struct debug_info*)file->f_dentry->d_inode->u.generic_ip;
 608         /* find debug view */
 609         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 610                 if (!debug_info->views[i])
 611                         continue;
 612                 else if (debug_info->debugfs_entries[i] ==
 613                          file->f_dentry) {
 614                         goto found;     /* found view ! */
 615                 }
 616         }
 617         /* no entry found */
 618         rc = -EINVAL;
 619         goto out;
 620
 621 found:
 622
 623         /* Make snapshot of current debug areas to get it consistent.     */
 624         /* To copy all the areas is only needed, if we have a view which  */
 625         /* formats the debug areas. */
 626
 627         if(!debug_info->views[i]->format_proc &&
 628                 !debug_info->views[i]->header_proc){
 629                 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
 630         } else {
 631                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
 632         }
 633
 634         if(!debug_info_snapshot){
 635                 rc = -ENOMEM;
 636                 goto out;
 637         }
 638         p_info = (file_private_info_t *) kmalloc(sizeof(file_private_info_t),
 639                                                 GFP_KERNEL);
 640         if(!p_info){
 641                 if(debug_info_snapshot)
 642                         debug_info_free(debug_info_snapshot);
 643                 rc = -ENOMEM;
 644                 goto out;
 645         }
 646         p_info->offset = 0;
 647         p_info->debug_info_snap = debug_info_snapshot;
 648         p_info->debug_info_org  = debug_info;
 649         p_info->view = debug_info->views[i];
 650         p_info->act_area = 0;
 651         p_info->act_page = 0;
 652         p_info->act_entry = DEBUG_PROLOG_ENTRY;
 653         p_info->act_entry_offset = 0;
 654         file->private_data = p_info;
 655         debug_info_get(debug_info);
 656 out:
 657         up(&debug_lock);
 658         return rc;
 659 }
 660
 661 /*
 662  * debug_close:
 663  * - called for user close()
 664  * - deletes  private_data area of the file handle
 665  */
 666
 667 static int
 668 debug_close(struct inode *inode, struct file *file)
 669 {
 670         file_private_info_t *p_info;
 671         p_info = (file_private_info_t *) file->private_data;
 672         if(p_info->debug_info_snap)
 673                 debug_info_free(p_info->debug_info_snap);
 674         debug_info_put(p_info->debug_info_org);
 675         kfree(file->private_data);
 676         return 0;               /* success */
 677 }
 678
 679 /*
 680  * debug_register:
 681  * - creates and initializes debug area for the caller
 682  * - returns handle for debug area
 683  */
 684
 685 debug_info_t*
 686 debug_register (char *name, int pages_per_area, int nr_areas, int buf_size)
 687 {
 688         debug_info_t *rc = NULL;
 689
 690         if (!initialized)
 691                 BUG();
 692         down(&debug_lock);
 693
 694         /* create new debug_info */
 695
 696         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size);
 697         if(!rc)
 698                 goto out;
 699         debug_register_view(rc, &debug_level_view);
 700         debug_register_view(rc, &debug_flush_view);
 701         debug_register_view(rc, &debug_pages_view);
 702 out:
 703         if (!rc){
 704                 printk(KERN_ERR "debug: debug_register failed for %s\n",name);
 705         }
 706         up(&debug_lock);
 707         return rc;
 708 }
 709
 710 /*
 711  * debug_unregister:
 712  * - give back debug area
 713  */
 714
 715 void
 716 debug_unregister(debug_info_t * id)
 717 {
 718         if (!id)
 719                 goto out;
 720         down(&debug_lock);
 721         debug_info_put(id);
 722         up(&debug_lock);
 723
 724 out:
 725         return;
 726 }
 727
 728 /*
 729  * debug_set_size:
 730  * - set area size (number of pages) and number of areas
 731  */
 732 static int
 733 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
 734 {
 735         unsigned long flags;
 736         debug_entry_t *** new_areas;
 737         int rc=0;
 738
 739         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
 740                 return -EINVAL;
 741         if(pages_per_area > 0){
 742                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
 743                 if(!new_areas) {
 744                         printk(KERN_WARNING "debug: could not allocate memory "\
 745                                          "for pagenumber: %i\n",pages_per_area);
 746                         rc = -ENOMEM;
 747                         goto out;
 748                 }
 749         } else {
 750                 new_areas = NULL;
 751         }
 752         spin_lock_irqsave(&id->lock,flags);
 753         debug_areas_free(id);
 754         id->areas = new_areas;
 755         id->nr_areas = nr_areas;
 756         id->pages_per_area = pages_per_area;
 757         id->active_area = 0;
 758         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
 759         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
 760         spin_unlock_irqrestore(&id->lock,flags);
 761         printk(KERN_INFO "debug: %s: set new size (%i pages)\n"\
 762                          ,id->name, pages_per_area);
 763 out:
 764         return rc;
 765 }
 766
 767 /*
 768  * debug_set_level:
 769  * - set actual debug level
 770  */
 771
 772 void
 773 debug_set_level(debug_info_t* id, int new_level)
 774 {
 775         unsigned long flags;
 776         if(!id)
 777                 return;
 778         spin_lock_irqsave(&id->lock,flags);
 779         if(new_level == DEBUG_OFF_LEVEL){
 780                 id->level = DEBUG_OFF_LEVEL;
 781                 printk(KERN_INFO "debug: %s: switched off\n",id->name);
 782         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
 783                 printk(KERN_INFO
 784                         "debug: %s: level %i is out of range (%i - %i)\n",
 785                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
 786         } else {
 787                 id->level = new_level;
 788         }
 789         spin_unlock_irqrestore(&id->lock,flags);
 790 }
 791
 792
 793 /*
 794  * proceed_active_entry:
 795  * - set active entry to next in the ring buffer
 796  */
 797
 798 static inline void
 799 proceed_active_entry(debug_info_t * id)
 800 {
 801         if ((id->active_entries[id->active_area] += id->entry_size)
 802             > (PAGE_SIZE - id->entry_size)){
 803                 id->active_entries[id->active_area] = 0;
 804                 id->active_pages[id->active_area] =
 805                         (id->active_pages[id->active_area] + 1) %
 806                         id->pages_per_area;
 807         }
 808 }
 809
 810 /*
 811  * proceed_active_area:
 812  * - set active area to next in the ring buffer
 813  */
 814
 815 static inline void
 816 proceed_active_area(debug_info_t * id)
 817 {
 818         id->active_area++;
 819         id->active_area = id->active_area % id->nr_areas;
 820 }
 821
 822 /*
 823  * get_active_entry:
 824  */
 825
 826 static inline debug_entry_t*
 827 get_active_entry(debug_info_t * id)
 828 {
 829         return (debug_entry_t *) (((char *) id->areas[id->active_area]
 830                                         [id->active_pages[id->active_area]]) +
 831                                         id->active_entries[id->active_area]);
 832 }
 833
 834 /*
 835  * debug_finish_entry:
 836  * - set timestamp, caller address, cpu number etc.
 837  */
 838
 839 static inline void
 840 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
 841                         int exception)
 842 {
 843         active->id.stck = get_clock();
 844         active->id.fields.cpuid = smp_processor_id();
 845         active->caller = __builtin_return_address(0);
 846         active->id.fields.exception = exception;
 847         active->id.fields.level     = level;
 848         proceed_active_entry(id);
 849         if(exception)
 850                 proceed_active_area(id);
 851 }
 852
 853 static int debug_stoppable=1;
 854 static int debug_active=1;
 855
 856 #define CTL_S390DBF 5677
 857 #define CTL_S390DBF_STOPPABLE 5678
 858 #define CTL_S390DBF_ACTIVE 5679
 859
 860 /*
 861  * proc handler for the running debug_active sysctl
 862  * always allow read, allow write only if debug_stoppable is set or
 863  * if debug_active is already off
 864  */
 865 static int
 866 s390dbf_procactive(ctl_table *table, int write, struct file *filp,
 867                      void __user *buffer, size_t *lenp, loff_t *ppos)
 868 {
 869         if (!write || debug_stoppable || !debug_active)
 870                 return proc_dointvec(table, write, filp, buffer, lenp, ppos);
 871         else
 872                 return 0;
 873 }
 874
 875
 876 static struct ctl_table s390dbf_table[] = {
 877         {
 878                 .ctl_name       = CTL_S390DBF_STOPPABLE,
 879                 .procname       = "debug_stoppable",
 880                 .data           = &debug_stoppable,
 881                 .maxlen         = sizeof(int),
 882                 .mode           = S_IRUGO | S_IWUSR,
 883                 .proc_handler   = &proc_dointvec,
 884                 .strategy       = &sysctl_intvec,
 885         },
 886          {
 887                 .ctl_name       = CTL_S390DBF_ACTIVE,
 888                 .procname       = "debug_active",
 889                 .data           = &debug_active,
 890                 .maxlen         = sizeof(int),
 891                 .mode           = S_IRUGO | S_IWUSR,
 892                 .proc_handler   = &s390dbf_procactive,
 893                 .strategy       = &sysctl_intvec,
 894         },
 895         { .ctl_name = 0 }
 896 };
 897
 898 static struct ctl_table s390dbf_dir_table[] = {
 899         {
 900                 .ctl_name       = CTL_S390DBF,
 901                 .procname       = "s390dbf",
 902                 .maxlen         = 0,
 903                 .mode           = S_IRUGO | S_IXUGO,
 904                 .child          = s390dbf_table,
 905         },
 906         { .ctl_name = 0 }
 907 };
 908
 909 struct ctl_table_header *s390dbf_sysctl_header;
 910
 911 void
 912 debug_stop_all(void)
 913 {
 914         if (debug_stoppable)
 915                 debug_active = 0;
 916 }
 917
 918
 919 /*
 920  * debug_event_common:
 921  * - write debug entry with given size
 922  */
 923
 924 debug_entry_t*
 925 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
 926 {
 927         unsigned long flags;
 928         debug_entry_t *active;
 929
 930         if (!debug_active || !id->areas)
 931                 return NULL;
 932         spin_lock_irqsave(&id->lock, flags);
 933         active = get_active_entry(id);
 934         memset(DEBUG_DATA(active), 0, id->buf_size);
 935         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 936         debug_finish_entry(id, active, level, 0);
 937         spin_unlock_irqrestore(&id->lock, flags);
 938
 939         return active;
 940 }
 941
 942 /*
 943  * debug_exception_common:
 944  * - write debug entry with given size and switch to next debug area
 945  */
 946
 947 debug_entry_t
 948 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
 949 {
 950         unsigned long flags;
 951         debug_entry_t *active;
 952
 953         if (!debug_active || !id->areas)
 954                 return NULL;
 955         spin_lock_irqsave(&id->lock, flags);
 956         active = get_active_entry(id);
 957         memset(DEBUG_DATA(active), 0, id->buf_size);
 958         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 959         debug_finish_entry(id, active, level, 1);
 960         spin_unlock_irqrestore(&id->lock, flags);
 961
 962         return active;
 963 }
 964
 965 /*
 966  * counts arguments in format string for sprintf view
 967  */
 968
 969 static inline int
 970 debug_count_numargs(char *string)
 971 {
 972         int numargs=0;
 973
 974         while(*string) {
 975                 if(*string++=='%')
 976                         numargs++;
 977         }
 978         return(numargs);
 979 }
 980
 981 /*
 982  * debug_sprintf_event:
 983  */
 984
 985 debug_entry_t*
 986 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
 987 {
 988         va_list   ap;
 989         int numargs,idx;
 990         unsigned long flags;
 991         debug_sprintf_entry_t *curr_event;
 992         debug_entry_t *active;
 993
 994         if((!id) || (level > id->level))
 995                 return NULL;
 996         if (!debug_active || !id->areas)
 997                 return NULL;
 998         numargs=debug_count_numargs(string);
 999
1000         spin_lock_irqsave(&id->lock, flags);
1001         active = get_active_entry(id);
1002         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1003         va_start(ap,string);
1004         curr_event->string=string;
1005         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1006                 curr_event->args[idx]=va_arg(ap,long);
1007         va_end(ap);
1008         debug_finish_entry(id, active, level, 0);
1009         spin_unlock_irqrestore(&id->lock, flags);
1010
1011         return active;
1012 }
1013
1014 /*
1015  * debug_sprintf_exception:
1016  */
1017
1018 debug_entry_t*
1019 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1020 {
1021         va_list   ap;
1022         int numargs,idx;
1023         unsigned long flags;
1024         debug_sprintf_entry_t *curr_event;
1025         debug_entry_t *active;
1026
1027         if((!id) || (level > id->level))
1028                 return NULL;
1029         if (!debug_active || !id->areas)
1030                 return NULL;
1031
1032         numargs=debug_count_numargs(string);
1033
1034         spin_lock_irqsave(&id->lock, flags);
1035         active = get_active_entry(id);
1036         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1037         va_start(ap,string);
1038         curr_event->string=string;
1039         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1040                 curr_event->args[idx]=va_arg(ap,long);
1041         va_end(ap);
1042         debug_finish_entry(id, active, level, 1);
1043         spin_unlock_irqrestore(&id->lock, flags);
1044
1045         return active;
1046 }
1047
1048 /*
1049  * debug_init:
1050  * - is called exactly once to initialize the debug feature
1051  */
1052
1053 static int
1054 __init debug_init(void)
1055 {
1056         int rc = 0;
1057
1058         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table, 1);
1059         down(&debug_lock);
1060         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1061         printk(KERN_INFO "debug: Initialization complete\n");
1062         initialized = 1;
1063         up(&debug_lock);
1064
1065         return rc;
1066 }
1067
1068 /*
1069  * debug_register_view:
1070  */
1071
1072 int
1073 debug_register_view(debug_info_t * id, struct debug_view *view)
1074 {
1075         int rc = 0;
1076         int i;
1077         unsigned long flags;
1078         mode_t mode = S_IFREG;
1079         struct dentry *pde;
1080
1081         if (!id)
1082                 goto out;
1083         if (view->prolog_proc || view->format_proc || view->header_proc)
1084                 mode |= S_IRUSR;
1085         if (view->input_proc)
1086                 mode |= S_IWUSR;
1087         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1088                                 id , &debug_file_ops);
1089         if (!pde){
1090                 printk(KERN_WARNING "debug: debugfs_create_file() failed!"\
1091                         " Cannot register view %s/%s\n", id->name,view->name);
1092                 rc = -1;
1093                 goto out;
1094         }
1095         spin_lock_irqsave(&id->lock, flags);
1096         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1097                 if (!id->views[i])
1098                         break;
1099         }
1100         if (i == DEBUG_MAX_VIEWS) {
1101                 printk(KERN_WARNING "debug: cannot register view %s/%s\n",
1102                         id->name,view->name);
1103                 printk(KERN_WARNING
1104                         "debug: maximum number of views reached (%i)!\n", i);
1105                 debugfs_remove(pde);
1106                 rc = -1;
1107         } else {
1108                 id->views[i] = view;
1109                 id->debugfs_entries[i] = pde;
1110         }
1111         spin_unlock_irqrestore(&id->lock, flags);
1112 out:
1113         return rc;
1114 }
1115
1116 /*
1117  * debug_unregister_view:
1118  */
1119
1120 int
1121 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1122 {
1123         int rc = 0;
1124         int i;
1125         unsigned long flags;
1126
1127         if (!id)
1128                 goto out;
1129         spin_lock_irqsave(&id->lock, flags);
1130         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1131                 if (id->views[i] == view)
1132                         break;
1133         }
1134         if (i == DEBUG_MAX_VIEWS)
1135                 rc = -1;
1136         else {
1137                 debugfs_remove(id->debugfs_entries[i]);
1138                 id->views[i] = NULL;
1139                 rc = 0;
1140         }
1141         spin_unlock_irqrestore(&id->lock, flags);
1142 out:
1143         return rc;
1144 }
1145
1146 static inline char *
1147 debug_get_user_string(const char __user *user_buf, size_t user_len)
1148 {
1149         char* buffer;
1150
1151         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1152         if (!buffer)
1153                 return ERR_PTR(-ENOMEM);
1154         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1155                 kfree(buffer);
1156                 return ERR_PTR(-EFAULT);
1157         }
1158         /* got the string, now strip linefeed. */
1159         if (buffer[user_len - 1] == '\n')
1160                 buffer[user_len - 1] = 0;
1161         else
1162                 buffer[user_len] = 0;
1163         return buffer;
1164 }
1165
1166 static inline int
1167 debug_get_uint(char *buf)
1168 {
1169         int rc;
1170
1171         for(; isspace(*buf); buf++);
1172         rc = simple_strtoul(buf, &buf, 10);
1173         if(*buf){
1174                 printk("debug: no integer specified!\n");
1175                 rc = -EINVAL;
1176         }
1177         return rc;
1178 }
1179
1180 /*
1181  * functions for debug-views
1182  ***********************************
1183 */
1184
1185 /*
1186  * prints out actual debug level
1187  */
1188
1189 static int
1190 debug_prolog_pages_fn(debug_info_t * id,
1191                                  struct debug_view *view, char *out_buf)
1192 {
1193         return sprintf(out_buf, "%i\n", id->pages_per_area);
1194 }
1195
1196 /*
1197  * reads new size (number of pages per debug area)
1198  */
1199
1200 static int
1201 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1202                         struct file *file, const char __user *user_buf,
1203                         size_t user_len, loff_t * offset)
1204 {
1205         char *str;
1206         int rc,new_pages;
1207
1208         if (user_len > 0x10000)
1209                 user_len = 0x10000;
1210         if (*offset != 0){
1211                 rc = -EPIPE;
1212                 goto out;
1213         }
1214         str = debug_get_user_string(user_buf,user_len);
1215         if(IS_ERR(str)){
1216                 rc = PTR_ERR(str);
1217                 goto out;
1218         }
1219         new_pages = debug_get_uint(str);
1220         if(new_pages < 0){
1221                 rc = -EINVAL;
1222                 goto free_str;
1223         }
1224         rc = debug_set_size(id,id->nr_areas, new_pages);
1225         if(rc != 0){
1226                 rc = -EINVAL;
1227                 goto free_str;
1228         }
1229         rc = user_len;
1230 free_str:
1231         kfree(str);
1232 out:
1233         *offset += user_len;
1234         return rc;              /* number of input characters */
1235 }
1236
1237 /*
1238  * prints out actual debug level
1239  */
1240
1241 static int
1242 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1243 {
1244         int rc = 0;
1245
1246         if(id->level == DEBUG_OFF_LEVEL) {
1247                 rc = sprintf(out_buf,"-\n");
1248         }
1249         else {
1250                 rc = sprintf(out_buf, "%i\n", id->level);
1251         }
1252         return rc;
1253 }
1254
1255 /*
1256  * reads new debug level
1257  */
1258
1259 static int
1260 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1261                         struct file *file, const char __user *user_buf,
1262                         size_t user_len, loff_t * offset)
1263 {
1264         char *str;
1265         int rc,new_level;
1266
1267         if (user_len > 0x10000)
1268                 user_len = 0x10000;
1269         if (*offset != 0){
1270                 rc = -EPIPE;
1271                 goto out;
1272         }
1273         str = debug_get_user_string(user_buf,user_len);
1274         if(IS_ERR(str)){
1275                 rc = PTR_ERR(str);
1276                 goto out;
1277         }
1278         if(str[0] == '-'){
1279                 debug_set_level(id, DEBUG_OFF_LEVEL);
1280                 rc = user_len;
1281                 goto free_str;
1282         } else {
1283                 new_level = debug_get_uint(str);
1284         }
1285         if(new_level < 0) {
1286                 printk(KERN_INFO "debug: level `%s` is not valid\n", str);
1287                 rc = -EINVAL;
1288         } else {
1289                 debug_set_level(id, new_level);
1290                 rc = user_len;
1291         }
1292 free_str:
1293         kfree(str);
1294 out:
1295         *offset += user_len;
1296         return rc;              /* number of input characters */
1297 }
1298
1299
1300 /*
1301  * flushes debug areas
1302  */
1303
1304 void
1305 debug_flush(debug_info_t* id, int area)
1306 {
1307         unsigned long flags;
1308         int i,j;
1309
1310         if(!id || !id->areas)
1311                 return;
1312         spin_lock_irqsave(&id->lock,flags);
1313         if(area == DEBUG_FLUSH_ALL){
1314                 id->active_area = 0;
1315                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1316                 for (i = 0; i < id->nr_areas; i++) {
1317                         id->active_pages[i] = 0;
1318                         for(j = 0; j < id->pages_per_area; j++) {
1319                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1320                         }
1321                 }
1322                 printk(KERN_INFO "debug: %s: all areas flushed\n",id->name);
1323         } else if(area >= 0 && area < id->nr_areas) {
1324                 id->active_entries[area] = 0;
1325                 id->active_pages[area] = 0;
1326                 for(i = 0; i < id->pages_per_area; i++) {
1327                         memset(id->areas[area][i],0,PAGE_SIZE);
1328                 }
1329                 printk(KERN_INFO "debug: %s: area %i has been flushed\n",
1330                         id->name, area);
1331         } else {
1332                 printk(KERN_INFO
1333                       "debug: %s: area %i cannot be flushed (range: %i - %i)\n",
1334                         id->name, area, 0, id->nr_areas-1);
1335         }
1336         spin_unlock_irqrestore(&id->lock,flags);
1337 }
1338
1339 /*
1340  * view function: flushes debug areas
1341  */
1342
1343 static int
1344 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1345                         struct file *file, const char __user *user_buf,
1346                         size_t user_len, loff_t * offset)
1347 {
1348         char input_buf[1];
1349         int rc = user_len;
1350
1351         if (user_len > 0x10000)
1352                 user_len = 0x10000;
1353         if (*offset != 0){
1354                 rc = -EPIPE;
1355                 goto out;
1356         }
1357         if (copy_from_user(input_buf, user_buf, 1)){
1358                 rc = -EFAULT;
1359                 goto out;
1360         }
1361         if(input_buf[0] == '-') {
1362                 debug_flush(id, DEBUG_FLUSH_ALL);
1363                 goto out;
1364         }
1365         if (isdigit(input_buf[0])) {
1366                 int area = ((int) input_buf[0] - (int) '0');
1367                 debug_flush(id, area);
1368                 goto out;
1369         }
1370
1371         printk(KERN_INFO "debug: area `%c` is not valid\n", input_buf[0]);
1372
1373 out:
1374         *offset += user_len;
1375         return rc;              /* number of input characters */
1376 }
1377
1378 /*
1379  * prints debug header in raw format
1380  */
1381
1382 static int
1383 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1384                         int area, debug_entry_t * entry, char *out_buf)
1385 {
1386         int rc;
1387
1388         rc = sizeof(debug_entry_t);
1389         memcpy(out_buf,entry,sizeof(debug_entry_t));
1390         return rc;
1391 }
1392
1393 /*
1394  * prints debug data in raw format
1395  */
1396
1397 static int
1398 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1399                                char *out_buf, const char *in_buf)
1400 {
1401         int rc;
1402
1403         rc = id->buf_size;
1404         memcpy(out_buf, in_buf, id->buf_size);
1405         return rc;
1406 }
1407
1408 /*
1409  * prints debug data in hex/ascii format
1410  */
1411
1412 static int
1413 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1414                           char *out_buf, const char *in_buf)
1415 {
1416         int i, rc = 0;
1417
1418         for (i = 0; i < id->buf_size; i++) {
1419                 rc += sprintf(out_buf + rc, "%02x ",
1420                               ((unsigned char *) in_buf)[i]);
1421         }
1422         rc += sprintf(out_buf + rc, "| ");
1423         for (i = 0; i < id->buf_size; i++) {
1424                 unsigned char c = in_buf[i];
1425                 if (!isprint(c))
1426                         rc += sprintf(out_buf + rc, ".");
1427                 else
1428                         rc += sprintf(out_buf + rc, "%c", c);
1429         }
1430         rc += sprintf(out_buf + rc, "\n");
1431         return rc;
1432 }
1433
1434 /*
1435  * prints header for debug entry
1436  */
1437
1438 int
1439 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1440                          int area, debug_entry_t * entry, char *out_buf)
1441 {
1442         struct timespec time_spec;
1443         unsigned long long time;
1444         char *except_str;
1445         unsigned long caller;
1446         int rc = 0;
1447         unsigned int level;
1448
1449         level = entry->id.fields.level;
1450         time = entry->id.stck;
1451         /* adjust todclock to 1970 */
1452         time -= 0x8126d60e46000000LL - (0x3c26700LL * 1000000 * 4096);
1453         tod_to_timeval(time, &time_spec);
1454
1455         if (entry->id.fields.exception)
1456                 except_str = "*";
1457         else
1458                 except_str = "-";
1459         caller = ((unsigned long) entry->caller) & PSW_ADDR_INSN;
1460         rc += sprintf(out_buf, "%02i %011lu:%06lu %1u %1s %02i %p  ",
1461                       area, time_spec.tv_sec, time_spec.tv_nsec / 1000, level,
1462                       except_str, entry->id.fields.cpuid, (void *) caller);
1463         return rc;
1464 }
1465
1466 /*
1467  * prints debug data sprintf-formated:
1468  * debug_sprinf_event/exception calls must be used together with this view
1469  */
1470
1471 #define DEBUG_SPRINTF_MAX_ARGS 10
1472
1473 static int
1474 debug_sprintf_format_fn(debug_info_t * id, struct debug_view *view,
1475                         char *out_buf, debug_sprintf_entry_t *curr_event)
1476 {
1477         int num_longs, num_used_args = 0,i, rc = 0;
1478         int index[DEBUG_SPRINTF_MAX_ARGS];
1479
1480         /* count of longs fit into one entry */
1481         num_longs = id->buf_size /  sizeof(long);
1482
1483         if(num_longs < 1)
1484                 goto out; /* bufsize of entry too small */
1485         if(num_longs == 1) {
1486                 /* no args, we use only the string */
1487                 strcpy(out_buf, curr_event->string);
1488                 rc = strlen(curr_event->string);
1489                 goto out;
1490         }
1491
1492         /* number of arguments used for sprintf (without the format string) */
1493         num_used_args   = min(DEBUG_SPRINTF_MAX_ARGS, (num_longs - 1));
1494
1495         memset(index,0, DEBUG_SPRINTF_MAX_ARGS * sizeof(int));
1496
1497         for(i = 0; i < num_used_args; i++)
1498                 index[i] = i;
1499
1500         rc =  sprintf(out_buf, curr_event->string, curr_event->args[index[0]],
1501                 curr_event->args[index[1]], curr_event->args[index[2]],
1502                 curr_event->args[index[3]], curr_event->args[index[4]],
1503                 curr_event->args[index[5]], curr_event->args[index[6]],
1504                 curr_event->args[index[7]], curr_event->args[index[8]],
1505                 curr_event->args[index[9]]);
1506
1507 out:
1508
1509         return rc;
1510 }
1511
1512 /*
1513  * clean up module
1514  */
1515 void
1516 __exit debug_exit(void)
1517 {
1518         debugfs_remove(debug_debugfs_root_entry);
1519         unregister_sysctl_table(s390dbf_sysctl_header);
1520         return;
1521 }
1522
1523 /*
1524  * module definitions
1525  */
1526 postcore_initcall(debug_init);
1527 module_exit(debug_exit);
1528 MODULE_LICENSE("GPL");
1529
1530 EXPORT_SYMBOL(debug_register);
1531 EXPORT_SYMBOL(debug_unregister);
1532 EXPORT_SYMBOL(debug_set_level);
1533 EXPORT_SYMBOL(debug_stop_all);
1534 EXPORT_SYMBOL(debug_register_view);
1535 EXPORT_SYMBOL(debug_unregister_view);
1536 EXPORT_SYMBOL(debug_event_common);
1537 EXPORT_SYMBOL(debug_exception_common);
1538 EXPORT_SYMBOL(debug_hex_ascii_view);
1539 EXPORT_SYMBOL(debug_raw_view);
1540 EXPORT_SYMBOL(debug_dflt_header_fn);
1541 EXPORT_SYMBOL(debug_sprintf_view);
1542 EXPORT_SYMBOL(debug_sprintf_exception);
1543 EXPORT_SYMBOL(debug_sprintf_event);