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 #define KMSG_COMPONENT "s390dbf"
  14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/errno.h>
  19 #include <linux/slab.h>
  20 #include <linux/ctype.h>
  21 #include <linux/string.h>
  22 #include <linux/sysctl.h>
  23 #include <asm/uaccess.h>
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/fs.h>
  27 #include <linux/debugfs.h>
  28
  29 #include <asm/debug.h>
  30
  31 #define DEBUG_PROLOG_ENTRY -1
  32
  33 #define ALL_AREAS 0 /* copy all debug areas */
  34 #define NO_AREAS  1 /* copy no debug areas */
  35
  36 /* typedefs */
  37
  38 typedef struct file_private_info {
  39         loff_t offset;                  /* offset of last read in file */
  40         int    act_area;                /* number of last formated area */
  41         int    act_page;                /* act page in given area */
  42         int    act_entry;               /* last formated entry (offset */
  43                                         /* relative to beginning of last */
  44                                         /* formated page) */
  45         size_t act_entry_offset;        /* up to this offset we copied */
  46                                         /* in last read the last formated */
  47                                         /* entry to userland */
  48         char   temp_buf[2048];          /* buffer for output */
  49         debug_info_t *debug_info_org;   /* original debug information */
  50         debug_info_t *debug_info_snap;  /* snapshot of debug information */
  51         struct debug_view *view;        /* used view of debug info */
  52 } file_private_info_t;
  53
  54 typedef struct
  55 {
  56         char *string;
  57         /*
  58          * This assumes that all args are converted into longs
  59          * on L/390 this is the case for all types of parameter
  60          * except of floats, and long long (32 bit)
  61          *
  62          */
  63         long args[0];
  64 } debug_sprintf_entry_t;
  65
  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(const char *name, int pages_per_area,
  77                         int nr_areas, int buf_size, mode_t mode);
  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 static 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 static 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 static 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 /* used by dump analysis tools to determine version of debug feature */
 161 static unsigned int __used 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 static DEFINE_MUTEX(debug_mutex);
 168
 169 static int initialized;
 170
 171 static const 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 = 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] = 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(const char *name, int pages_per_area, int nr_areas,
 240                  int buf_size, int level, int mode)
 241 {
 242         debug_info_t* rc;
 243
 244         /* alloc everything */
 245
 246         rc = 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));
 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(const char *name, int pages_per_area, int nr_areas,
 332                   int buf_size, mode_t mode)
 333 {
 334         debug_info_t* rc;
 335
 336         rc = debug_info_alloc(name, pages_per_area, nr_areas, buf_size,
 337                                 DEBUG_DEFAULT_LEVEL, ALL_AREAS);
 338         if(!rc)
 339                 goto out;
 340
 341         rc->mode = mode & ~S_IFMT;
 342
 343         /* create root directory */
 344         rc->debugfs_root_entry = debugfs_create_dir(rc->name,
 345                                         debug_debugfs_root_entry);
 346
 347         /* append new element to linked list */
 348         if (!debug_area_first) {
 349                 /* first element in list */
 350                 debug_area_first = rc;
 351                 rc->prev = NULL;
 352         } else {
 353                 /* append element to end of list */
 354                 debug_area_last->next = rc;
 355                 rc->prev = debug_area_last;
 356         }
 357         debug_area_last = rc;
 358         rc->next = NULL;
 359
 360         debug_info_get(rc);
 361 out:
 362         return rc;
 363 }
 364
 365 /*
 366  * debug_info_copy
 367  * - copy debug-info
 368  */
 369
 370 static debug_info_t*
 371 debug_info_copy(debug_info_t* in, int mode)
 372 {
 373         int i,j;
 374         debug_info_t* rc;
 375         unsigned long flags;
 376
 377         /* get a consistent copy of the debug areas */
 378         do {
 379                 rc = debug_info_alloc(in->name, in->pages_per_area,
 380                         in->nr_areas, in->buf_size, in->level, mode);
 381                 spin_lock_irqsave(&in->lock, flags);
 382                 if(!rc)
 383                         goto out;
 384                 /* has something changed in the meantime ? */
 385                 if((rc->pages_per_area == in->pages_per_area) &&
 386                    (rc->nr_areas == in->nr_areas)) {
 387                         break;
 388                 }
 389                 spin_unlock_irqrestore(&in->lock, flags);
 390                 debug_info_free(rc);
 391         } while (1);
 392
 393         if (mode == NO_AREAS)
 394                 goto out;
 395
 396         for(i = 0; i < in->nr_areas; i++){
 397                 for(j = 0; j < in->pages_per_area; j++) {
 398                         memcpy(rc->areas[i][j], in->areas[i][j],PAGE_SIZE);
 399                 }
 400         }
 401 out:
 402         spin_unlock_irqrestore(&in->lock, flags);
 403         return rc;
 404 }
 405
 406 /*
 407  * debug_info_get
 408  * - increments reference count for debug-info
 409  */
 410
 411 static void
 412 debug_info_get(debug_info_t * db_info)
 413 {
 414         if (db_info)
 415                 atomic_inc(&db_info->ref_count);
 416 }
 417
 418 /*
 419  * debug_info_put:
 420  * - decreases reference count for debug-info and frees it if necessary
 421  */
 422
 423 static void
 424 debug_info_put(debug_info_t *db_info)
 425 {
 426         int i;
 427
 428         if (!db_info)
 429                 return;
 430         if (atomic_dec_and_test(&db_info->ref_count)) {
 431                 for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 432                         if (!db_info->views[i])
 433                                 continue;
 434                         debugfs_remove(db_info->debugfs_entries[i]);
 435                 }
 436                 debugfs_remove(db_info->debugfs_root_entry);
 437                 if(db_info == debug_area_first)
 438                         debug_area_first = db_info->next;
 439                 if(db_info == debug_area_last)
 440                         debug_area_last = db_info->prev;
 441                 if(db_info->prev) db_info->prev->next = db_info->next;
 442                 if(db_info->next) db_info->next->prev = db_info->prev;
 443                 debug_info_free(db_info);
 444         }
 445 }
 446
 447 /*
 448  * debug_format_entry:
 449  * - format one debug entry and return size of formated data
 450  */
 451
 452 static int
 453 debug_format_entry(file_private_info_t *p_info)
 454 {
 455         debug_info_t *id_snap   = p_info->debug_info_snap;
 456         struct debug_view *view = p_info->view;
 457         debug_entry_t *act_entry;
 458         size_t len = 0;
 459         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 460                 /* print prolog */
 461                 if (view->prolog_proc)
 462                         len += view->prolog_proc(id_snap,view,p_info->temp_buf);
 463                 goto out;
 464         }
 465         if (!id_snap->areas) /* this is true, if we have a prolog only view */
 466                 goto out;    /* or if 'pages_per_area' is 0 */
 467         act_entry = (debug_entry_t *) ((char*)id_snap->areas[p_info->act_area]
 468                                 [p_info->act_page] + p_info->act_entry);
 469
 470         if (act_entry->id.stck == 0LL)
 471                         goto out;  /* empty entry */
 472         if (view->header_proc)
 473                 len += view->header_proc(id_snap, view, p_info->act_area,
 474                                         act_entry, p_info->temp_buf + len);
 475         if (view->format_proc)
 476                 len += view->format_proc(id_snap, view, p_info->temp_buf + len,
 477                                                 DEBUG_DATA(act_entry));
 478 out:
 479         return len;
 480 }
 481
 482 /*
 483  * debug_next_entry:
 484  * - goto next entry in p_info
 485  */
 486
 487 static inline int
 488 debug_next_entry(file_private_info_t *p_info)
 489 {
 490         debug_info_t *id;
 491
 492         id = p_info->debug_info_snap;
 493         if(p_info->act_entry == DEBUG_PROLOG_ENTRY){
 494                 p_info->act_entry = 0;
 495                 p_info->act_page  = 0;
 496                 goto out;
 497         }
 498         if(!id->areas)
 499                 return 1;
 500         p_info->act_entry += id->entry_size;
 501         /* switch to next page, if we reached the end of the page  */
 502         if (p_info->act_entry > (PAGE_SIZE - id->entry_size)){
 503                 /* next page */
 504                 p_info->act_entry = 0;
 505                 p_info->act_page += 1;
 506                 if((p_info->act_page % id->pages_per_area) == 0) {
 507                         /* next area */
 508                         p_info->act_area++;
 509                         p_info->act_page=0;
 510                 }
 511                 if(p_info->act_area >= id->nr_areas)
 512                         return 1;
 513         }
 514 out:
 515         return 0;
 516 }
 517
 518 /*
 519  * debug_output:
 520  * - called for user read()
 521  * - copies formated debug entries to the user buffer
 522  */
 523
 524 static ssize_t
 525 debug_output(struct file *file,         /* file descriptor */
 526             char __user *user_buf,      /* user buffer */
 527             size_t  len,                /* length of buffer */
 528             loff_t *offset)             /* offset in the file */
 529 {
 530         size_t count = 0;
 531         size_t entry_offset;
 532         file_private_info_t *p_info;
 533
 534         p_info = ((file_private_info_t *) file->private_data);
 535         if (*offset != p_info->offset)
 536                 return -EPIPE;
 537         if(p_info->act_area >= p_info->debug_info_snap->nr_areas)
 538                 return 0;
 539         entry_offset = p_info->act_entry_offset;
 540         while(count < len){
 541                 int formatted_line_size;
 542                 int formatted_line_residue;
 543                 int user_buf_residue;
 544                 size_t copy_size;
 545
 546                 formatted_line_size = debug_format_entry(p_info);
 547                 formatted_line_residue = formatted_line_size - entry_offset;
 548                 user_buf_residue = len-count;
 549                 copy_size = min(user_buf_residue, formatted_line_residue);
 550                 if(copy_size){
 551                         if (copy_to_user(user_buf + count, p_info->temp_buf
 552                                         + entry_offset, copy_size))
 553                                 return -EFAULT;
 554                         count += copy_size;
 555                         entry_offset += copy_size;
 556                 }
 557                 if(copy_size == formatted_line_residue){
 558                         entry_offset = 0;
 559                         if(debug_next_entry(p_info))
 560                                 goto out;
 561                 }
 562         }
 563 out:
 564         p_info->offset           = *offset + count;
 565         p_info->act_entry_offset = entry_offset;
 566         *offset = p_info->offset;
 567         return count;
 568 }
 569
 570 /*
 571  * debug_input:
 572  * - called for user write()
 573  * - calls input function of view
 574  */
 575
 576 static ssize_t
 577 debug_input(struct file *file, const char __user *user_buf, size_t length,
 578                 loff_t *offset)
 579 {
 580         int rc = 0;
 581         file_private_info_t *p_info;
 582
 583         mutex_lock(&debug_mutex);
 584         p_info = ((file_private_info_t *) file->private_data);
 585         if (p_info->view->input_proc)
 586                 rc = p_info->view->input_proc(p_info->debug_info_org,
 587                                               p_info->view, file, user_buf,
 588                                               length, offset);
 589         else
 590                 rc = -EPERM;
 591         mutex_unlock(&debug_mutex);
 592         return rc;              /* number of input characters */
 593 }
 594
 595 /*
 596  * debug_open:
 597  * - called for user open()
 598  * - copies formated output to private_data area of the file
 599  *   handle
 600  */
 601
 602 static int
 603 debug_open(struct inode *inode, struct file *file)
 604 {
 605         int i, rc = 0;
 606         file_private_info_t *p_info;
 607         debug_info_t *debug_info, *debug_info_snapshot;
 608
 609         mutex_lock(&debug_mutex);
 610         debug_info = file->f_path.dentry->d_inode->i_private;
 611         /* find debug view */
 612         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
 613                 if (!debug_info->views[i])
 614                         continue;
 615                 else if (debug_info->debugfs_entries[i] ==
 616                          file->f_path.dentry) {
 617                         goto found;     /* found view ! */
 618                 }
 619         }
 620         /* no entry found */
 621         rc = -EINVAL;
 622         goto out;
 623
 624 found:
 625
 626         /* Make snapshot of current debug areas to get it consistent.     */
 627         /* To copy all the areas is only needed, if we have a view which  */
 628         /* formats the debug areas. */
 629
 630         if(!debug_info->views[i]->format_proc &&
 631                 !debug_info->views[i]->header_proc){
 632                 debug_info_snapshot = debug_info_copy(debug_info, NO_AREAS);
 633         } else {
 634                 debug_info_snapshot = debug_info_copy(debug_info, ALL_AREAS);
 635         }
 636
 637         if(!debug_info_snapshot){
 638                 rc = -ENOMEM;
 639                 goto out;
 640         }
 641         p_info = kmalloc(sizeof(file_private_info_t),
 642                                                 GFP_KERNEL);
 643         if(!p_info){
 644                 debug_info_free(debug_info_snapshot);
 645                 rc = -ENOMEM;
 646                 goto out;
 647         }
 648         p_info->offset = 0;
 649         p_info->debug_info_snap = debug_info_snapshot;
 650         p_info->debug_info_org  = debug_info;
 651         p_info->view = debug_info->views[i];
 652         p_info->act_area = 0;
 653         p_info->act_page = 0;
 654         p_info->act_entry = DEBUG_PROLOG_ENTRY;
 655         p_info->act_entry_offset = 0;
 656         file->private_data = p_info;
 657         debug_info_get(debug_info);
 658 out:
 659         mutex_unlock(&debug_mutex);
 660         return rc;
 661 }
 662
 663 /*
 664  * debug_close:
 665  * - called for user close()
 666  * - deletes  private_data area of the file handle
 667  */
 668
 669 static int
 670 debug_close(struct inode *inode, struct file *file)
 671 {
 672         file_private_info_t *p_info;
 673         p_info = (file_private_info_t *) file->private_data;
 674         if(p_info->debug_info_snap)
 675                 debug_info_free(p_info->debug_info_snap);
 676         debug_info_put(p_info->debug_info_org);
 677         kfree(file->private_data);
 678         return 0;               /* success */
 679 }
 680
 681 /*
 682  * debug_register_mode:
 683  * - Creates and initializes debug area for the caller
 684  *   The mode parameter allows to specify access rights for the s390dbf files
 685  * - Returns handle for debug area
 686  */
 687
 688 debug_info_t *debug_register_mode(const char *name, int pages_per_area,
 689                                   int nr_areas, int buf_size, mode_t mode,
 690                                   uid_t uid, gid_t gid)
 691 {
 692         debug_info_t *rc = NULL;
 693
 694         /* Since debugfs currently does not support uid/gid other than root, */
 695         /* we do not allow gid/uid != 0 until we get support for that. */
 696         if ((uid != 0) || (gid != 0))
 697                 pr_warning("Root becomes the owner of all s390dbf files "
 698                            "in sysfs\n");
 699         BUG_ON(!initialized);
 700         mutex_lock(&debug_mutex);
 701
 702         /* create new debug_info */
 703
 704         rc = debug_info_create(name, pages_per_area, nr_areas, buf_size, mode);
 705         if(!rc)
 706                 goto out;
 707         debug_register_view(rc, &debug_level_view);
 708         debug_register_view(rc, &debug_flush_view);
 709         debug_register_view(rc, &debug_pages_view);
 710 out:
 711         if (!rc){
 712                 pr_err("Registering debug feature %s failed\n", name);
 713         }
 714         mutex_unlock(&debug_mutex);
 715         return rc;
 716 }
 717 EXPORT_SYMBOL(debug_register_mode);
 718
 719 /*
 720  * debug_register:
 721  * - creates and initializes debug area for the caller
 722  * - returns handle for debug area
 723  */
 724
 725 debug_info_t *debug_register(const char *name, int pages_per_area,
 726                              int nr_areas, int buf_size)
 727 {
 728         return debug_register_mode(name, pages_per_area, nr_areas, buf_size,
 729                                    S_IRUSR | S_IWUSR, 0, 0);
 730 }
 731
 732 /*
 733  * debug_unregister:
 734  * - give back debug area
 735  */
 736
 737 void
 738 debug_unregister(debug_info_t * id)
 739 {
 740         if (!id)
 741                 goto out;
 742         mutex_lock(&debug_mutex);
 743         debug_info_put(id);
 744         mutex_unlock(&debug_mutex);
 745
 746 out:
 747         return;
 748 }
 749
 750 /*
 751  * debug_set_size:
 752  * - set area size (number of pages) and number of areas
 753  */
 754 static int
 755 debug_set_size(debug_info_t* id, int nr_areas, int pages_per_area)
 756 {
 757         unsigned long flags;
 758         debug_entry_t *** new_areas;
 759         int rc=0;
 760
 761         if(!id || (nr_areas <= 0) || (pages_per_area < 0))
 762                 return -EINVAL;
 763         if(pages_per_area > 0){
 764                 new_areas = debug_areas_alloc(pages_per_area, nr_areas);
 765                 if(!new_areas) {
 766                         pr_info("Allocating memory for %i pages failed\n",
 767                                 pages_per_area);
 768                         rc = -ENOMEM;
 769                         goto out;
 770                 }
 771         } else {
 772                 new_areas = NULL;
 773         }
 774         spin_lock_irqsave(&id->lock,flags);
 775         debug_areas_free(id);
 776         id->areas = new_areas;
 777         id->nr_areas = nr_areas;
 778         id->pages_per_area = pages_per_area;
 779         id->active_area = 0;
 780         memset(id->active_entries,0,sizeof(int)*id->nr_areas);
 781         memset(id->active_pages, 0, sizeof(int)*id->nr_areas);
 782         spin_unlock_irqrestore(&id->lock,flags);
 783         pr_info("%s: set new size (%i pages)\n" ,id->name, pages_per_area);
 784 out:
 785         return rc;
 786 }
 787
 788 /*
 789  * debug_set_level:
 790  * - set actual debug level
 791  */
 792
 793 void
 794 debug_set_level(debug_info_t* id, int new_level)
 795 {
 796         unsigned long flags;
 797         if(!id)
 798                 return;
 799         spin_lock_irqsave(&id->lock,flags);
 800         if(new_level == DEBUG_OFF_LEVEL){
 801                 id->level = DEBUG_OFF_LEVEL;
 802                 pr_info("%s: switched off\n",id->name);
 803         } else if ((new_level > DEBUG_MAX_LEVEL) || (new_level < 0)) {
 804                 pr_info("%s: level %i is out of range (%i - %i)\n",
 805                         id->name, new_level, 0, DEBUG_MAX_LEVEL);
 806         } else {
 807                 id->level = new_level;
 808         }
 809         spin_unlock_irqrestore(&id->lock,flags);
 810 }
 811
 812
 813 /*
 814  * proceed_active_entry:
 815  * - set active entry to next in the ring buffer
 816  */
 817
 818 static inline void
 819 proceed_active_entry(debug_info_t * id)
 820 {
 821         if ((id->active_entries[id->active_area] += id->entry_size)
 822             > (PAGE_SIZE - id->entry_size)){
 823                 id->active_entries[id->active_area] = 0;
 824                 id->active_pages[id->active_area] =
 825                         (id->active_pages[id->active_area] + 1) %
 826                         id->pages_per_area;
 827         }
 828 }
 829
 830 /*
 831  * proceed_active_area:
 832  * - set active area to next in the ring buffer
 833  */
 834
 835 static inline void
 836 proceed_active_area(debug_info_t * id)
 837 {
 838         id->active_area++;
 839         id->active_area = id->active_area % id->nr_areas;
 840 }
 841
 842 /*
 843  * get_active_entry:
 844  */
 845
 846 static inline debug_entry_t*
 847 get_active_entry(debug_info_t * id)
 848 {
 849         return (debug_entry_t *) (((char *) id->areas[id->active_area]
 850                                         [id->active_pages[id->active_area]]) +
 851                                         id->active_entries[id->active_area]);
 852 }
 853
 854 /*
 855  * debug_finish_entry:
 856  * - set timestamp, caller address, cpu number etc.
 857  */
 858
 859 static inline void
 860 debug_finish_entry(debug_info_t * id, debug_entry_t* active, int level,
 861                         int exception)
 862 {
 863         active->id.stck = get_clock();
 864         active->id.fields.cpuid = smp_processor_id();
 865         active->caller = __builtin_return_address(0);
 866         active->id.fields.exception = exception;
 867         active->id.fields.level     = level;
 868         proceed_active_entry(id);
 869         if(exception)
 870                 proceed_active_area(id);
 871 }
 872
 873 static int debug_stoppable=1;
 874 static int debug_active=1;
 875
 876 #define CTL_S390DBF_STOPPABLE 5678
 877 #define CTL_S390DBF_ACTIVE 5679
 878
 879 /*
 880  * proc handler for the running debug_active sysctl
 881  * always allow read, allow write only if debug_stoppable is set or
 882  * if debug_active is already off
 883  */
 884 static int
 885 s390dbf_procactive(ctl_table *table, int write,
 886                      void __user *buffer, size_t *lenp, loff_t *ppos)
 887 {
 888         if (!write || debug_stoppable || !debug_active)
 889                 return proc_dointvec(table, write, buffer, lenp, ppos);
 890         else
 891                 return 0;
 892 }
 893
 894
 895 static struct ctl_table s390dbf_table[] = {
 896         {
 897                 .procname       = "debug_stoppable",
 898                 .data           = &debug_stoppable,
 899                 .maxlen         = sizeof(int),
 900                 .mode           = S_IRUGO | S_IWUSR,
 901                 .proc_handler   = proc_dointvec,
 902         },
 903          {
 904                 .procname       = "debug_active",
 905                 .data           = &debug_active,
 906                 .maxlen         = sizeof(int),
 907                 .mode           = S_IRUGO | S_IWUSR,
 908                 .proc_handler   = s390dbf_procactive,
 909         },
 910         { }
 911 };
 912
 913 static struct ctl_table s390dbf_dir_table[] = {
 914         {
 915                 .procname       = "s390dbf",
 916                 .maxlen         = 0,
 917                 .mode           = S_IRUGO | S_IXUGO,
 918                 .child          = s390dbf_table,
 919         },
 920         { }
 921 };
 922
 923 static struct ctl_table_header *s390dbf_sysctl_header;
 924
 925 void
 926 debug_stop_all(void)
 927 {
 928         if (debug_stoppable)
 929                 debug_active = 0;
 930 }
 931
 932
 933 /*
 934  * debug_event_common:
 935  * - write debug entry with given size
 936  */
 937
 938 debug_entry_t*
 939 debug_event_common(debug_info_t * id, int level, const void *buf, int len)
 940 {
 941         unsigned long flags;
 942         debug_entry_t *active;
 943
 944         if (!debug_active || !id->areas)
 945                 return NULL;
 946         spin_lock_irqsave(&id->lock, flags);
 947         active = get_active_entry(id);
 948         memset(DEBUG_DATA(active), 0, id->buf_size);
 949         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 950         debug_finish_entry(id, active, level, 0);
 951         spin_unlock_irqrestore(&id->lock, flags);
 952
 953         return active;
 954 }
 955
 956 /*
 957  * debug_exception_common:
 958  * - write debug entry with given size and switch to next debug area
 959  */
 960
 961 debug_entry_t
 962 *debug_exception_common(debug_info_t * id, int level, const void *buf, int len)
 963 {
 964         unsigned long flags;
 965         debug_entry_t *active;
 966
 967         if (!debug_active || !id->areas)
 968                 return NULL;
 969         spin_lock_irqsave(&id->lock, flags);
 970         active = get_active_entry(id);
 971         memset(DEBUG_DATA(active), 0, id->buf_size);
 972         memcpy(DEBUG_DATA(active), buf, min(len, id->buf_size));
 973         debug_finish_entry(id, active, level, 1);
 974         spin_unlock_irqrestore(&id->lock, flags);
 975
 976         return active;
 977 }
 978
 979 /*
 980  * counts arguments in format string for sprintf view
 981  */
 982
 983 static inline int
 984 debug_count_numargs(char *string)
 985 {
 986         int numargs=0;
 987
 988         while(*string) {
 989                 if(*string++=='%')
 990                         numargs++;
 991         }
 992         return(numargs);
 993 }
 994
 995 /*
 996  * debug_sprintf_event:
 997  */
 998
 999 debug_entry_t*
1000 debug_sprintf_event(debug_info_t* id, int level,char *string,...)
1001 {
1002         va_list   ap;
1003         int numargs,idx;
1004         unsigned long flags;
1005         debug_sprintf_entry_t *curr_event;
1006         debug_entry_t *active;
1007
1008         if((!id) || (level > id->level))
1009                 return NULL;
1010         if (!debug_active || !id->areas)
1011                 return NULL;
1012         numargs=debug_count_numargs(string);
1013
1014         spin_lock_irqsave(&id->lock, flags);
1015         active = get_active_entry(id);
1016         curr_event=(debug_sprintf_entry_t *) DEBUG_DATA(active);
1017         va_start(ap,string);
1018         curr_event->string=string;
1019         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1020                 curr_event->args[idx]=va_arg(ap,long);
1021         va_end(ap);
1022         debug_finish_entry(id, active, level, 0);
1023         spin_unlock_irqrestore(&id->lock, flags);
1024
1025         return active;
1026 }
1027
1028 /*
1029  * debug_sprintf_exception:
1030  */
1031
1032 debug_entry_t*
1033 debug_sprintf_exception(debug_info_t* id, int level,char *string,...)
1034 {
1035         va_list   ap;
1036         int numargs,idx;
1037         unsigned long flags;
1038         debug_sprintf_entry_t *curr_event;
1039         debug_entry_t *active;
1040
1041         if((!id) || (level > id->level))
1042                 return NULL;
1043         if (!debug_active || !id->areas)
1044                 return NULL;
1045
1046         numargs=debug_count_numargs(string);
1047
1048         spin_lock_irqsave(&id->lock, flags);
1049         active = get_active_entry(id);
1050         curr_event=(debug_sprintf_entry_t *)DEBUG_DATA(active);
1051         va_start(ap,string);
1052         curr_event->string=string;
1053         for(idx=0;idx<min(numargs,(int)(id->buf_size / sizeof(long))-1);idx++)
1054                 curr_event->args[idx]=va_arg(ap,long);
1055         va_end(ap);
1056         debug_finish_entry(id, active, level, 1);
1057         spin_unlock_irqrestore(&id->lock, flags);
1058
1059         return active;
1060 }
1061
1062 /*
1063  * debug_init:
1064  * - is called exactly once to initialize the debug feature
1065  */
1066
1067 static int
1068 __init debug_init(void)
1069 {
1070         int rc = 0;
1071
1072         s390dbf_sysctl_header = register_sysctl_table(s390dbf_dir_table);
1073         mutex_lock(&debug_mutex);
1074         debug_debugfs_root_entry = debugfs_create_dir(DEBUG_DIR_ROOT,NULL);
1075         initialized = 1;
1076         mutex_unlock(&debug_mutex);
1077
1078         return rc;
1079 }
1080
1081 /*
1082  * debug_register_view:
1083  */
1084
1085 int
1086 debug_register_view(debug_info_t * id, struct debug_view *view)
1087 {
1088         int rc = 0;
1089         int i;
1090         unsigned long flags;
1091         mode_t mode;
1092         struct dentry *pde;
1093
1094         if (!id)
1095                 goto out;
1096         mode = (id->mode | S_IFREG) & ~S_IXUGO;
1097         if (!(view->prolog_proc || view->format_proc || view->header_proc))
1098                 mode &= ~(S_IRUSR | S_IRGRP | S_IROTH);
1099         if (!view->input_proc)
1100                 mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
1101         pde = debugfs_create_file(view->name, mode, id->debugfs_root_entry,
1102                                 id , &debug_file_ops);
1103         if (!pde){
1104                 pr_err("Registering view %s/%s failed due to out of "
1105                        "memory\n", id->name,view->name);
1106                 rc = -1;
1107                 goto out;
1108         }
1109         spin_lock_irqsave(&id->lock, flags);
1110         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1111                 if (!id->views[i])
1112                         break;
1113         }
1114         if (i == DEBUG_MAX_VIEWS) {
1115                 pr_err("Registering view %s/%s would exceed the maximum "
1116                        "number of views %i\n", id->name, view->name, i);
1117                 debugfs_remove(pde);
1118                 rc = -1;
1119         } else {
1120                 id->views[i] = view;
1121                 id->debugfs_entries[i] = pde;
1122         }
1123         spin_unlock_irqrestore(&id->lock, flags);
1124 out:
1125         return rc;
1126 }
1127
1128 /*
1129  * debug_unregister_view:
1130  */
1131
1132 int
1133 debug_unregister_view(debug_info_t * id, struct debug_view *view)
1134 {
1135         int rc = 0;
1136         int i;
1137         unsigned long flags;
1138
1139         if (!id)
1140                 goto out;
1141         spin_lock_irqsave(&id->lock, flags);
1142         for (i = 0; i < DEBUG_MAX_VIEWS; i++) {
1143                 if (id->views[i] == view)
1144                         break;
1145         }
1146         if (i == DEBUG_MAX_VIEWS)
1147                 rc = -1;
1148         else {
1149                 debugfs_remove(id->debugfs_entries[i]);
1150                 id->views[i] = NULL;
1151         }
1152         spin_unlock_irqrestore(&id->lock, flags);
1153 out:
1154         return rc;
1155 }
1156
1157 static inline char *
1158 debug_get_user_string(const char __user *user_buf, size_t user_len)
1159 {
1160         char* buffer;
1161
1162         buffer = kmalloc(user_len + 1, GFP_KERNEL);
1163         if (!buffer)
1164                 return ERR_PTR(-ENOMEM);
1165         if (copy_from_user(buffer, user_buf, user_len) != 0) {
1166                 kfree(buffer);
1167                 return ERR_PTR(-EFAULT);
1168         }
1169         /* got the string, now strip linefeed. */
1170         if (buffer[user_len - 1] == '\n')
1171                 buffer[user_len - 1] = 0;
1172         else
1173                 buffer[user_len] = 0;
1174         return buffer;
1175 }
1176
1177 static inline int
1178 debug_get_uint(char *buf)
1179 {
1180         int rc;
1181
1182         buf = skip_spaces(buf);
1183         rc = simple_strtoul(buf, &buf, 10);
1184         if(*buf){
1185                 rc = -EINVAL;
1186         }
1187         return rc;
1188 }
1189
1190 /*
1191  * functions for debug-views
1192  ***********************************
1193 */
1194
1195 /*
1196  * prints out actual debug level
1197  */
1198
1199 static int
1200 debug_prolog_pages_fn(debug_info_t * id,
1201                                  struct debug_view *view, char *out_buf)
1202 {
1203         return sprintf(out_buf, "%i\n", id->pages_per_area);
1204 }
1205
1206 /*
1207  * reads new size (number of pages per debug area)
1208  */
1209
1210 static int
1211 debug_input_pages_fn(debug_info_t * id, struct debug_view *view,
1212                         struct file *file, const char __user *user_buf,
1213                         size_t user_len, loff_t * offset)
1214 {
1215         char *str;
1216         int rc,new_pages;
1217
1218         if (user_len > 0x10000)
1219                 user_len = 0x10000;
1220         if (*offset != 0){
1221                 rc = -EPIPE;
1222                 goto out;
1223         }
1224         str = debug_get_user_string(user_buf,user_len);
1225         if(IS_ERR(str)){
1226                 rc = PTR_ERR(str);
1227                 goto out;
1228         }
1229         new_pages = debug_get_uint(str);
1230         if(new_pages < 0){
1231                 rc = -EINVAL;
1232                 goto free_str;
1233         }
1234         rc = debug_set_size(id,id->nr_areas, new_pages);
1235         if(rc != 0){
1236                 rc = -EINVAL;
1237                 goto free_str;
1238         }
1239         rc = user_len;
1240 free_str:
1241         kfree(str);
1242 out:
1243         *offset += user_len;
1244         return rc;              /* number of input characters */
1245 }
1246
1247 /*
1248  * prints out actual debug level
1249  */
1250
1251 static int
1252 debug_prolog_level_fn(debug_info_t * id, struct debug_view *view, char *out_buf)
1253 {
1254         int rc = 0;
1255
1256         if(id->level == DEBUG_OFF_LEVEL) {
1257                 rc = sprintf(out_buf,"-\n");
1258         }
1259         else {
1260                 rc = sprintf(out_buf, "%i\n", id->level);
1261         }
1262         return rc;
1263 }
1264
1265 /*
1266  * reads new debug level
1267  */
1268
1269 static int
1270 debug_input_level_fn(debug_info_t * id, struct debug_view *view,
1271                         struct file *file, const char __user *user_buf,
1272                         size_t user_len, loff_t * offset)
1273 {
1274         char *str;
1275         int rc,new_level;
1276
1277         if (user_len > 0x10000)
1278                 user_len = 0x10000;
1279         if (*offset != 0){
1280                 rc = -EPIPE;
1281                 goto out;
1282         }
1283         str = debug_get_user_string(user_buf,user_len);
1284         if(IS_ERR(str)){
1285                 rc = PTR_ERR(str);
1286                 goto out;
1287         }
1288         if(str[0] == '-'){
1289                 debug_set_level(id, DEBUG_OFF_LEVEL);
1290                 rc = user_len;
1291                 goto free_str;
1292         } else {
1293                 new_level = debug_get_uint(str);
1294         }
1295         if(new_level < 0) {
1296                 pr_warning("%s is not a valid level for a debug "
1297                            "feature\n", str);
1298                 rc = -EINVAL;
1299         } else {
1300                 debug_set_level(id, new_level);
1301                 rc = user_len;
1302         }
1303 free_str:
1304         kfree(str);
1305 out:
1306         *offset += user_len;
1307         return rc;              /* number of input characters */
1308 }
1309
1310
1311 /*
1312  * flushes debug areas
1313  */
1314
1315 static void debug_flush(debug_info_t* id, int area)
1316 {
1317         unsigned long flags;
1318         int i,j;
1319
1320         if(!id || !id->areas)
1321                 return;
1322         spin_lock_irqsave(&id->lock,flags);
1323         if(area == DEBUG_FLUSH_ALL){
1324                 id->active_area = 0;
1325                 memset(id->active_entries, 0, id->nr_areas * sizeof(int));
1326                 for (i = 0; i < id->nr_areas; i++) {
1327                         id->active_pages[i] = 0;
1328                         for(j = 0; j < id->pages_per_area; j++) {
1329                                 memset(id->areas[i][j], 0, PAGE_SIZE);
1330                         }
1331                 }
1332         } else if(area >= 0 && area < id->nr_areas) {
1333                 id->active_entries[area] = 0;
1334                 id->active_pages[area] = 0;
1335                 for(i = 0; i < id->pages_per_area; i++) {
1336                         memset(id->areas[area][i],0,PAGE_SIZE);
1337                 }
1338         }
1339         spin_unlock_irqrestore(&id->lock,flags);
1340 }
1341
1342 /*
1343  * view function: flushes debug areas
1344  */
1345
1346 static int
1347 debug_input_flush_fn(debug_info_t * id, struct debug_view *view,
1348                         struct file *file, const char __user *user_buf,
1349                         size_t user_len, loff_t * offset)
1350 {
1351         char input_buf[1];
1352         int rc = user_len;
1353
1354         if (user_len > 0x10000)
1355                 user_len = 0x10000;
1356         if (*offset != 0){
1357                 rc = -EPIPE;
1358                 goto out;
1359         }
1360         if (copy_from_user(input_buf, user_buf, 1)){
1361                 rc = -EFAULT;
1362                 goto out;
1363         }
1364         if(input_buf[0] == '-') {
1365                 debug_flush(id, DEBUG_FLUSH_ALL);
1366                 goto out;
1367         }
1368         if (isdigit(input_buf[0])) {
1369                 int area = ((int) input_buf[0] - (int) '0');
1370                 debug_flush(id, area);
1371                 goto out;
1372         }
1373
1374         pr_info("Flushing debug data failed because %c is not a valid "
1375                  "area\n", input_buf[0]);
1376
1377 out:
1378         *offset += user_len;
1379         return rc;              /* number of input characters */
1380 }
1381
1382 /*
1383  * prints debug header in raw format
1384  */
1385
1386 static int
1387 debug_raw_header_fn(debug_info_t * id, struct debug_view *view,
1388                         int area, debug_entry_t * entry, char *out_buf)
1389 {
1390         int rc;
1391
1392         rc = sizeof(debug_entry_t);
1393         memcpy(out_buf,entry,sizeof(debug_entry_t));
1394         return rc;
1395 }
1396
1397 /*
1398  * prints debug data in raw format
1399  */
1400
1401 static int
1402 debug_raw_format_fn(debug_info_t * id, struct debug_view *view,
1403                                char *out_buf, const char *in_buf)
1404 {
1405         int rc;
1406
1407         rc = id->buf_size;
1408         memcpy(out_buf, in_buf, id->buf_size);
1409         return rc;
1410 }
1411
1412 /*
1413  * prints debug data in hex/ascii format
1414  */
1415
1416 static int
1417 debug_hex_ascii_format_fn(debug_info_t * id, struct debug_view *view,
1418                           char *out_buf, const char *in_buf)
1419 {
1420         int i, rc = 0;
1421
1422         for (i = 0; i < id->buf_size; i++) {
1423                 rc += sprintf(out_buf + rc, "%02x ",
1424                               ((unsigned char *) in_buf)[i]);
1425         }
1426         rc += sprintf(out_buf + rc, "| ");
1427         for (i = 0; i < id->buf_size; i++) {
1428                 unsigned char c = in_buf[i];
1429                 if (!isprint(c))
1430                         rc += sprintf(out_buf + rc, ".");
1431                 else
1432                         rc += sprintf(out_buf + rc, "%c", c);
1433         }
1434         rc += sprintf(out_buf + rc, "\n");
1435         return rc;
1436 }
1437
1438 /*
1439  * prints header for debug entry
1440  */
1441
1442 int
1443 debug_dflt_header_fn(debug_info_t * id, struct debug_view *view,
1444                          int area, debug_entry_t * entry, char *out_buf)
1445 {
1446         struct timespec time_spec;
1447         char *except_str;
1448         unsigned long caller;
1449         int rc = 0;
1450         unsigned int level;
1451
1452         level = entry->id.fields.level;
1453         stck_to_timespec(entry->id.stck, &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 static void __exit debug_exit(void)
1516 {
1517         debugfs_remove(debug_debugfs_root_entry);
1518         unregister_sysctl_table(s390dbf_sysctl_header);
1519         return;
1520 }
1521
1522 /*
1523  * module definitions
1524  */
1525 postcore_initcall(debug_init);
1526 module_exit(debug_exit);
1527 MODULE_LICENSE("GPL");
1528
1529 EXPORT_SYMBOL(debug_register);
1530 EXPORT_SYMBOL(debug_unregister);
1531 EXPORT_SYMBOL(debug_set_level);
1532 EXPORT_SYMBOL(debug_stop_all);
1533 EXPORT_SYMBOL(debug_register_view);
1534 EXPORT_SYMBOL(debug_unregister_view);
1535 EXPORT_SYMBOL(debug_event_common);
1536 EXPORT_SYMBOL(debug_exception_common);
1537 EXPORT_SYMBOL(debug_hex_ascii_view);
1538 EXPORT_SYMBOL(debug_raw_view);
1539 EXPORT_SYMBOL(debug_dflt_header_fn);
1540 EXPORT_SYMBOL(debug_sprintf_view);
1541 EXPORT_SYMBOL(debug_sprintf_exception);
1542 EXPORT_SYMBOL(debug_sprintf_event);