driver/device_driver.c

   1 ////////////////////////////////////////////////////////////////////////////////////
   2 //
   3 //      FILE:           device_driver.c
   4 //
   5 //      DESCRIPTION:
   6 //      This file is C source for SWAP driver.
   7 //
   8 //      SEE ALSO:       device_driver.h
   9 //      AUTHOR:         L.Komkov, S.Dianov, S.Grekhov, A.Gerenkov
  10 //      COMPANY NAME:   Samsung Research Center in Moscow
  11 //      DEPT NAME:      Advanced Software Group
  12 //      CREATED:        2008.02.15
  13 //      VERSION:        1.0
  14 //      REVISION DATE:  2008.12.03
  15 //
  16 ////////////////////////////////////////////////////////////////////////////////////
  17
  18 #include "module.h"
  19 #include "device_driver.h"      // device driver
  20 #include "handlers_core.h"
  21 #include <linux/notifier.h>
  22 #include "sspt/sspt_procs.h"
  23
  24 #ifdef OVERHEAD_DEBUG
  25 extern unsigned long swap_sum_time;
  26 extern unsigned long swap_sum_hit;
  27 #endif
  28
  29
  30 extern unsigned long imi_sum_time;
  31 extern unsigned long imi_sum_hit;
  32
  33
  34 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
  35 static BLOCKING_NOTIFIER_HEAD(swap_notifier_list);
  36 #endif
  37 pid_t gl_nNotifyTgid;
  38 EXPORT_SYMBOL_GPL(gl_nNotifyTgid);
  39
  40 static DECLARE_WAIT_QUEUE_HEAD (notification_waiters_queue);
  41 static volatile unsigned notification_count;
  42
  43 static int device_mmap (struct file *filp, struct vm_area_struct *vma);
  44 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
  45 static int device_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg);
  46 #else
  47 static long device_ioctl (struct file *file, unsigned int cmd, unsigned long arg);
  48 #endif
  49 static int device_open(struct inode *, struct file *);
  50 static int device_release(struct inode *, struct file *);
  51 static ssize_t device_read(struct file *, char __user *, size_t, loff_t *);
  52 static ssize_t device_write(struct file *, const char __user *, size_t, loff_t *);
  53
  54 static int gl_nDeviceOpened = 0;
  55 static struct file_operations device_fops = {
  56         .owner = THIS_MODULE,
  57         .mmap = device_mmap,
  58 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
  59         .ioctl = device_ioctl,
  60 #else
  61         .unlocked_ioctl = device_ioctl,
  62 #endif
  63         .read = device_read,
  64         .write = device_write,
  65         .open = device_open,
  66         .release = device_release
  67 };
  68
  69 typedef void (* dbi_module_callback)(void);
  70
  71 int device_init (void)
  72 {
  73         int nReserved = 0;
  74         nReserved = register_chrdev(0, device_name, &device_fops);
  75         if(nReserved < 0)
  76         {
  77                 unregister_chrdev(nReserved, device_name);
  78                 EPRINTF("Cannot register character device!");
  79                 return -1;
  80         }
  81         EPRINTF("New device node with major number [%d], was created\n", nReserved);
  82         device_major = nReserved;
  83         return 0;
  84 }
  85
  86 void device_down (void)
  87 {
  88         unregister_chrdev(device_major, device_name);
  89 }
  90
  91 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
  92 void swap_register_notify (struct notifier_block *nb)
  93 {
  94         blocking_notifier_chain_register(&swap_notifier_list, nb);
  95 }
  96 EXPORT_SYMBOL_GPL(swap_register_notify);
  97
  98 void swap_unregister_notify (struct notifier_block *nb)
  99 {
 100         blocking_notifier_chain_unregister(&swap_notifier_list, nb);
 101 }
 102 EXPORT_SYMBOL_GPL(swap_unregister_notify);
 103 #endif
 104
 105 void notify_user (event_id_t event_id)
 106 {
 107         ec_info.events_counters[event_id] += 1;
 108
 109         if (EVENT_EC_PROBE_RECORD == event_id)
 110         {
 111                 // EC_PROBE_RECORD events happen to often. To reduce overhead user
 112                 // space will be notified only once per each EVENTS_AGGREGATION_USEC
 113                 static uint64_t timestamp_usec = 0;
 114
 115                 uint64_t current_usec;
 116                 uint64_t delta_usec;
 117
 118                 struct timeval tv;
 119
 120                 do_gettimeofday (&tv);
 121                 current_usec = 1000000ULL * (unsigned) tv.tv_sec + (unsigned) tv.tv_usec;
 122
 123                 if (current_usec < timestamp_usec)
 124                 {
 125                         // Note: time from do_gettimeofday() may go backward
 126                         EPRINTF ("current_usec=%llu timestamp_usec=%llu", current_usec, timestamp_usec);
 127                 }
 128                 else
 129                 {
 130                         delta_usec = current_usec - timestamp_usec;
 131                         if (EVENTS_AGGREGATION_USEC > delta_usec)
 132                         {
 133                                 // wait the time left
 134 #if defined(__DEBUG)
 135                                 unsigned UNUSED left_usec = EVENTS_AGGREGATION_USEC - delta_usec;
 136 #endif /* defined(__DEBUG) */
 137                                 return; // supress notification
 138                         }
 139                 }
 140                 timestamp_usec = current_usec;  // remember new time for the future use
 141         } else if (EVENT_EC_START_CONDITION_SEEN == event_id) {
 142                 return;         // supress notification
 143         } else if (EVENT_EC_STOP_CONDITION_SEEN == event_id) {
 144                 return;         // supress notification
 145         }
 146
 147         ++notification_count;
 148         wake_up_interruptible (&notification_waiters_queue);
 149 }
 150
 151 static int device_mmap (struct file *filp UNUSED, struct vm_area_struct *vma)
 152 {
 153         if(!p_buffer) {
 154                 EPRINTF("Null pointer to buffer!");
 155                 return -1;
 156         }
 157         return remap_vmalloc_range (vma, p_buffer, 0);
 158 }
 159
 160 static int device_open(struct inode *inode, struct file *file)
 161 {
 162         /*if (gl_nDeviceOpened)
 163                 return -EBUSY;*/
 164         gl_nDeviceOpened++;
 165         // TODO
 166         try_module_get(THIS_MODULE);
 167         return 0;
 168 }
 169
 170 static int device_release(struct inode *inode, struct file *file)
 171 {
 172         gl_nDeviceOpened--;
 173         EPRINTF("++ pre module_put");
 174         module_put(THIS_MODULE);
 175         EPRINTF("++ aft module_put");
 176         return 0;
 177 }
 178
 179 static ssize_t device_read(struct file *filp, char __user *buffer, size_t length, loff_t * offset)
 180 {
 181         EPRINTF("Operation <<read>> not supported!");
 182         return -1;
 183 }
 184
 185 static ssize_t device_write(struct file *filp, const char __user *buff, size_t len, loff_t * off)
 186 {
 187         EPRINTF("Operation <<write>> not supported!");
 188         return -1;
 189 }
 190
 191 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
 192 static int device_ioctl (struct inode *inode UNUSED, struct file *file UNUSED, unsigned int cmd, unsigned long arg)
 193 #else
 194 static long device_ioctl (struct file *file UNUSED, unsigned int cmd, unsigned long arg)
 195 #endif
 196 {
 197         unsigned long spinlock_flags = 0L;
 198         int result = -1;
 199     void __user * arg_pointer = (void __user *) arg;
 200 //      DPRINTF("Command=%d", cmd);
 201         switch (cmd)
 202         {
 203         case EC_IOCTL_SET_EC_MODE:
 204                 {
 205                         ioctl_general_t param;
 206                         unsigned long nIgnoredBytes = 0;
 207                         memset(&param, '0', sizeof(ioctl_general_t));
 208                         nIgnoredBytes = copy_from_user (&param, arg_pointer, sizeof(ioctl_general_t));
 209                         if (nIgnoredBytes > 0) {
 210                                 result = -1;
 211                                 break;
 212                         }
 213                         if(SetECMode(param.m_unsignedLong) == -1) {
 214                                 result = -1;
 215                                 break;
 216                         }
 217                         result = 0;
 218                         DPRINTF("Set EC Mode = %lu", param.m_unsignedLong);
 219                         break;
 220                 }
 221         case EC_IOCTL_GET_EC_MODE:
 222                 {
 223                         ioctl_general_t param;
 224                         unsigned long nIgnoredBytes = 0;
 225                         memset(&param, '0', sizeof(ioctl_general_t));
 226                         param.m_unsignedLong = GetECMode();
 227                         nIgnoredBytes = copy_to_user (arg_pointer, &param, sizeof (ioctl_general_t));
 228                         if (nIgnoredBytes > 0) {
 229                                 result = -1;
 230                                 break;
 231                         }
 232                         result = 0;
 233 //                      DPRINTF("Get EC Mode = %lu", param.m_unsignedLong);  // Frequent call
 234                         break;
 235                 }
 236         case EC_IOCTL_SET_BUFFER_SIZE:
 237                 {
 238                         ioctl_general_t param;
 239                         unsigned long nIgnoredBytes = 0;
 240                         memset(&param, '0', sizeof(ioctl_general_t));
 241                         nIgnoredBytes = copy_from_user (&param, arg_pointer, sizeof(ioctl_general_t));
 242                         if (nIgnoredBytes > 0) {
 243                                 result = -1;
 244                                 break;
 245                         }
 246                         if (SetBufferSize(param.m_unsignedLong) == -1) {
 247                                 result = -1;
 248                                 break;
 249                         }
 250                         result = 0;
 251                         DPRINTF("Set Buffer Size = %lu", param.m_unsignedLong);
 252                         break;
 253                 }
 254         case EC_IOCTL_GET_BUFFER_SIZE:
 255                 {
 256                         ioctl_general_t param;
 257                         unsigned long nIgnoredBytes = 0;
 258                         memset(&param, '0', sizeof(ioctl_general_t));
 259                         param.m_unsignedLong = GetBufferSize();
 260                         nIgnoredBytes = copy_to_user (arg_pointer, &param, sizeof (ioctl_general_t));
 261                         if (nIgnoredBytes > 0) {
 262                                 result = -1;
 263                                 break;
 264                         }
 265                         result = 0;
 266                         DPRINTF("Get Buffer Size = %lu", param.m_unsignedLong);
 267                         break;
 268                 }
 269         case EC_IOCTL_RESET_BUFFER:
 270                 {
 271                         if (ResetBuffer() == -1) {
 272                                 result = -1;
 273                                 break;
 274                         }
 275                         result = 0;
 276                         DPRINTF("Reset Buffer");
 277                         break;
 278                 }
 279         case EC_IOCTL_GET_EC_INFO:
 280                 {
 281                         if (copy_ec_info_to_user_space ((ec_info_t *) arg) != 0) {
 282                                 result = -1;
 283                                 break;
 284                         }
 285                         result = 0;
 286 //                      DPRINTF("Get Buffer Status"); // Frequent call
 287                         break;
 288                 }
 289         case EC_IOCTL_CONSUME_BUFFER:
 290                 {
 291                         static ec_info_t ec_info_copy;
 292                         int nIgnoredBytes = 0;
 293
 294                         nIgnoredBytes = copy_from_user (&ec_info_copy, (const void __user *) arg, sizeof (ec_info_t));
 295                         if(nIgnoredBytes > 0)
 296                         {
 297                                 EPRINTF ("copy_from_user(%08X,%08X)=%d", (unsigned) arg, (unsigned) &ec_info_copy, nIgnoredBytes);
 298                                 result = -1;
 299                                 break;
 300                         }
 301
 302                         spin_lock_irqsave (&ec_spinlock, spinlock_flags);
 303
 304                         // Original buffer
 305                         if(ec_info.after_last > ec_info.first) {
 306                                 ec_info.buffer_effect = ec_info.buffer_size;
 307                         }
 308                         if (ec_info.after_last == ec_info.buffer_effect) {
 309                                  ec_info.first = 0;
 310                         } else {
 311                                  ec_info.first = ec_info_copy.after_last;
 312                         }
 313                         ec_info.trace_size = ec_info.trace_size - ec_info_copy.trace_size;
 314
 315                         spin_unlock_irqrestore (&ec_spinlock, spinlock_flags);
 316                         result = 0;
 317 //                      DPRINTF("Consume Buffer"); // Frequent call
 318                         break;
 319                 }
 320         case EC_IOCTL_ADD_PROBE:
 321                 {
 322                         unsigned long addr = arg;
 323                         result = add_probe(addr);
 324
 325                         break;
 326                 }
 327         //@AGv: remove_probe expects probe address instead of name
 328         /*case EC_IOCTL_REMOVE_PROBE:
 329                 {
 330                         char *probe_name = (char *) arg;
 331                         result = remove_probe (probe_name);
 332
 333                         break;
 334                 }*/
 335         case EC_IOCTL_SET_APPDEPS:
 336         {
 337                 size_t size;
 338                 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
 339                 if (result) {
 340                         EPRINTF("Cannot copy deps size!");
 341                         result = -1;
 342                         break;
 343                 }
 344                 DPRINTF("Deps size has been copied (%d)", size);
 345
 346                 if (size == 0) {
 347                         DPRINTF("Deps are size of 0");
 348                         break;
 349                 }
 350
 351                 deps = vmalloc(size);
 352                 if (deps == NULL) {
 353                         EPRINTF("Cannot alloc mem for deps!");
 354                         result = -1;
 355                         break;
 356                 }
 357                 DPRINTF("Mem for deps has been allocated");
 358
 359                 result = copy_from_user(deps, arg_pointer, size);
 360                 if (result) {
 361                         EPRINTF("Cannot copy deps!");
 362                         result = -1;
 363                         break;
 364                 }
 365                 DPRINTF("Deps has been copied successfully");
 366
 367                 break;
 368         }
 369         case EC_IOCTL_SET_PID:
 370         {
 371                 unsigned int _pid;
 372
 373                 result = copy_from_user(&_pid, arg_pointer, sizeof(unsigned int));
 374                 if (result) {
 375                         EPRINTF("Cannot copy pid!");
 376                         result = -1;
 377                         break;
 378                 }
 379
 380                 inst_pid = _pid;
 381
 382                 DPRINTF("EC_IOCTL_SET_PID pid:%d", inst_pid);
 383
 384                 break;
 385         }
 386         case EC_IOCTL_SET_PROFILEBUNDLE:
 387         {
 388                 size_t size;
 389
 390                 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
 391                 if (result) {
 392                         EPRINTF("Cannot copy bundle size!");
 393                         result = -1;
 394                         break;
 395                 }
 396                 DPRINTF("Bundle size has been copied");
 397
 398                 bundle = vmalloc(size);
 399                 if (bundle == NULL) {
 400                         EPRINTF("Cannot alloc mem for bundle!");
 401                         result = -1;
 402                         break;
 403                 }
 404                 DPRINTF("Mem for bundle has been alloced");
 405
 406                 result = copy_from_user(bundle, arg_pointer, size);
 407                 if (result) {
 408                         EPRINTF("Cannot copy bundle!");
 409                         result = -1;
 410                         break;
 411                 }
 412                 DPRINTF("Bundle has been copied successfully");
 413
 414 //              last_error_buffer_initialize();
 415
 416 //              printk(" --++@@ bef lb\n");
 417                 if (link_bundle() == -1 || has_last_error() == -1) {
 418                         EPRINTF("Cannot link profile bundle!");
 419                         result = -1;
 420                         break;
 421                 }
 422 //              printk(" --++@@ bef has_last_error\n");
 423 //              if (has_last_error() == -1) {
 424 //                      printk(" --++@@ in if\n");
 425 //                      DPRINTF("last_error_buffer != NULL");
 426 //                      result = -1;
 427 //              }
 428 //              printk(" --++@@ aft has_last_error\n");
 429
 430                 break;
 431         }
 432         case EC_IOCTL_RESET_PROBES:
 433                 {
 434                         result = reset_probes();
 435
 436                         break;
 437                 }
 438         case EC_IOCTL_UPDATE_CONDS:
 439                 {
 440                         int args_cnt, i;
 441                         struct cond *c, *c_tmp, *p_cond;
 442                         unsigned char *p_data;
 443                         int err;
 444                         result = 0;
 445                         err = copy_from_user(&args_cnt, arg_pointer, sizeof(int));
 446                         if (err) {
 447                                 result = -1;
 448                                 break;
 449                         }
 450                         /* first, delete all the conds */
 451                         list_for_each_entry_safe(c, c_tmp, &cond_list.list, list) {
 452                                 list_del(&c->list);
 453                                 kfree(c);
 454                         }
 455                         /* second, add new conds */
 456                         p_data = (unsigned char *)(arg + sizeof(int));
 457                         for (i = 0; i < args_cnt; i++) {
 458                                 p_cond = kmalloc(sizeof(struct cond), GFP_KERNEL);
 459                                 if (!p_cond) {
 460                                         DPRINTF("Cannot alloc cond!");
 461                                         result = -1;
 462                                         break;
 463                                 }
 464                                 err = copy_from_user(&p_cond->tmpl, (const void __user *)p_data,
 465                                                 sizeof(struct event_tmpl));
 466                                 if (err) {
 467                                         DPRINTF("Cannot copy cond from user!");
 468                                         result = -1;
 469                                         break;
 470                                 }
 471                                 p_cond->applied = 0;
 472                                 list_add(&(p_cond->list), &(cond_list.list));
 473                                 p_data += sizeof(struct event_tmpl);
 474                         }
 475                         break;
 476                 }
 477         case EC_IOCTL_ATTACH:
 478                 {
 479                         unsigned long dbi_flags;
 480                         struct dbi_modules_handlers *local_mh;
 481                         struct dbi_modules_handlers_info *local_mhi;
 482                         int j;
 483                         dbi_module_callback dmc_start;
 484
 485                         // call "start"-callback for all modules according module priority
 486                         local_mh = get_dbi_modules_handlers();
 487                         spin_lock_irqsave(&local_mh->lock, dbi_flags);
 488                         for (j = 0; j <= MAX_PRIORITY; j++) {
 489                                 list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 490                                         if (local_mhi->dbi_module_priority_start == j) {
 491                                                 if (local_mhi->dbi_module_callback_start != NULL) {
 492                                                         printk("Started module callback (start) %s\n", local_mhi->dbi_module->name);
 493                                                         dmc_start = (dbi_module_callback )local_mhi->dbi_module_callback_start;
 494                                                         dmc_start();
 495                                                 }
 496                                         }
 497                                 }
 498                         }
 499                         spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 500
 501                         result = ec_user_attach ();
 502 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
 503                         DPRINTF("EC_IOCTL_ATTACH calling notification chain");
 504                         blocking_notifier_call_chain(&swap_notifier_list, EC_IOCTL_ATTACH, (void*)NULL);
 505 #endif
 506                         DPRINTF("Attach Probes");
 507                         break;
 508                 }
 509         case EC_IOCTL_ACTIVATE:
 510                 result = ec_user_activate ();
 511                 DPRINTF("Activate Probes");
 512                 break;
 513         case EC_IOCTL_STOP_AND_DETACH:
 514         {
 515                 unsigned long nIgnoredBytes = 0;
 516                 unsigned long dbi_flags;
 517                 struct dbi_modules_handlers *local_mh;
 518                 struct dbi_modules_handlers_info *local_mhi;
 519                 unsigned int local_module_refcount = 0;
 520                 int j;
 521                 dbi_module_callback dmc_stop;
 522
 523 #ifdef OVERHEAD_DEBUG
 524                 printk("\nswap_sum_time = %ld in kprobe_handler()\n", swap_sum_time);
 525                 printk("swap_sum_hit = %ld in kprobe_handler()\n", swap_sum_hit);
 526                 swap_sum_time = 0;
 527                 swap_sum_hit = 0;
 528 #endif
 529
 530                 printk("\n### imi_sum_time = %ld in install_mapped_ips()\n", imi_sum_time);
 531                 printk("### imi_sum_hit = %ld in install_mapped_ips()\n", imi_sum_hit);
 532
 533                 if (imi_sum_hit != 0) {
 534                         printk("### time = %ld in install_mapped_ips()\n", imi_sum_time/imi_sum_hit);
 535                 }
 536
 537                 imi_sum_time = 0;
 538                 imi_sum_hit = 0;
 539
 540                 local_mh = get_dbi_modules_handlers();
 541                 if(ec_user_stop() != 0) {
 542                         result = -1;
 543                         goto sad_cleanup;
 544                 }
 545                 nIgnoredBytes = copy_ec_info_to_user_space ((ec_info_t*)arg);
 546                 if(nIgnoredBytes > 0) {
 547                         result = -1;
 548                         goto sad_cleanup;
 549                 }
 550
 551                 sspt_procs_free_all();
 552
 553                 vfree(bundle);
 554                 result = 0;
 555                 DPRINTF("Stop and Detach Probes");
 556 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
 557                 DPRINTF("EC_IOCTL_STOP_AND_DETACH calling notification chain");
 558                 blocking_notifier_call_chain(&swap_notifier_list, EC_IOCTL_STOP_AND_DETACH, (void*)&gl_nNotifyTgid);
 559 #endif
 560                 // call "stop"-callback for all modules according module priority
 561                 spin_lock_irqsave(&local_mh->lock, dbi_flags);
 562                 for (j = 0; j <= MAX_PRIORITY; j++) {
 563                         list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 564                                 if (local_mhi->dbi_module_priority_stop == j) {
 565                                         if (local_mhi->dbi_module_callback_stop != NULL) {
 566                                                 printk("Started module callback (stop) %s\n", local_mhi->dbi_module->name);
 567                                                 dmc_stop = (dbi_module_callback )local_mhi->dbi_module_callback_stop;
 568                                                 dmc_stop();
 569                                         }
 570                                 }
 571                         }
 572                 }
 573                 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 574 sad_cleanup:
 575                 spin_lock_irqsave(&local_mh->lock, dbi_flags);
 576                 list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 577                         local_module_refcount = module_refcount(local_mhi->dbi_module);
 578                         if (local_module_refcount == 1) {
 579                                 module_put(local_mhi->dbi_module);
 580                         }
 581                         else if (local_module_refcount > 1) {
 582                                 printk("local_module_refcount too much - force set refcount to zero\n");
 583                                 while (local_module_refcount--)
 584                                         module_put(local_mhi->dbi_module);
 585                         }
 586                 }
 587                 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 588                 break;
 589         }
 590         case EC_IOCTL_US_EVENT:
 591                 {
 592                         ioctl_us_event_t ioctl_args;
 593                         result = copy_from_user (&ioctl_args, (const void __user *) arg, sizeof (ioctl_args));
 594                         if (result)
 595                         {
 596                                 result = -1;
 597                                 EPRINTF ("copy_from_user() failure");
 598                         }
 599                         else
 600                         {
 601                                 if(ioctl_args.len == 0){
 602                                         result = -EINVAL;
 603                                         EPRINTF ("invalid event length!");
 604                                 }
 605                                 else {
 606                                         char *buf = kmalloc(ioctl_args.len, GFP_KERNEL);
 607                                         if(!buf){
 608                                                 result = -ENOMEM;
 609                                                 EPRINTF ("failed to alloc mem for event!");
 610                                         }
 611                                         else {
 612                                                 result = copy_from_user (buf, (const void __user *) ioctl_args.data, ioctl_args.len);
 613                                                 if (result){
 614                                                         result = -1;
 615                                                         EPRINTF ("failed to copy event from user space!");
 616                                                 }
 617                                                 else
 618                                                         result = put_us_event(buf, ioctl_args.len);
 619                                                 kfree(buf);
 620                                         }
 621                                 }
 622                         }
 623 //                      DPRINTF("User Space Event"); // Frequent call
 624                         break;
 625                 }
 626
 627         case EC_IOCTL_SET_EVENT_MASK:
 628                 {
 629                         int mask;
 630                         result = copy_from_user (&mask, arg_pointer, sizeof (mask));
 631                         if (result)
 632                         {
 633                                 result = -EFAULT;
 634                                 break;
 635                         }
 636
 637                         result = set_event_mask (mask);
 638                         if (result)
 639                         {
 640                                 break;
 641                         }
 642                         DPRINTF("Set Event Mask = %d", mask);
 643                         break;
 644                 }
 645
 646         case EC_IOCTL_GET_EVENT_MASK:
 647                 {
 648                         int mask = 0;
 649                         result = get_event_mask(&mask);
 650                         if (result)
 651                         {
 652                                 result = -EFAULT;
 653                         }
 654                         result = copy_to_user (arg_pointer, &mask, sizeof (mask));
 655                         if (result)
 656                         {
 657                                 result = -EFAULT;
 658                         }
 659                         DPRINTF("Get Event Mask = %d", mask);
 660                         break;
 661                 }
 662
 663         case EC_IOCTL_GET_PREDEF_UPROBES:
 664                 {
 665                         result = get_predef_uprobes((ioctl_predef_uprobes_info_t *)arg);
 666                         if (result)
 667                         {
 668                                 result = -EFAULT;
 669                         }
 670                         DPRINTF("Get Predefined User Space Probes");
 671                         break;
 672                 }
 673
 674         case EC_IOCTL_GET_PREDEF_UPROBES_SIZE:
 675                 {
 676                         int size = 0;
 677                         result = get_predef_uprobes_size(&size);
 678                         if (result)
 679                         {
 680                                 result = -EFAULT;
 681                         }
 682                         result = copy_to_user (arg_pointer, &size, sizeof (size));
 683                         if (result)
 684                         {
 685                                 result = -EFAULT;
 686                         }
 687                         DPRINTF("Get Size of Predefined User Space Probes");
 688                         break;
 689                 }
 690         case EC_IOCTL_GET_LAST_ERROR:
 691                 {
 692                         result = get_last_error((void*)arg);
 693                         DPRINTF("Get last error buffer");
 694                         break;
 695                 }
 696         default:
 697                 EPRINTF ("Unknown driver command = %u", cmd);
 698                 result = -EINVAL;
 699                 break;
 700         }
 701
 702         return result;
 703 }