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         module_put(THIS_MODULE);
 174         return 0;
 175 }
 176
 177 static ssize_t device_read(struct file *filp, char __user *buffer, size_t length, loff_t * offset)
 178 {
 179         EPRINTF("Operation <<read>> not supported!");
 180         return -1;
 181 }
 182
 183 static ssize_t device_write(struct file *filp, const char __user *buff, size_t len, loff_t * off)
 184 {
 185         EPRINTF("Operation <<write>> not supported!");
 186         return -1;
 187 }
 188
 189 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
 190 static int device_ioctl (struct inode *inode UNUSED, struct file *file UNUSED, unsigned int cmd, unsigned long arg)
 191 #else
 192 static long device_ioctl (struct file *file UNUSED, unsigned int cmd, unsigned long arg)
 193 #endif
 194 {
 195         unsigned long spinlock_flags = 0L;
 196         int result = -1;
 197     void __user * arg_pointer = (void __user *) arg;
 198 //      DPRINTF("Command=%d", cmd);
 199         switch (cmd)
 200         {
 201         case EC_IOCTL_SET_EC_MODE:
 202                 {
 203                         ioctl_general_t param;
 204                         unsigned long nIgnoredBytes = 0;
 205                         memset(&param, '0', sizeof(ioctl_general_t));
 206                         nIgnoredBytes = copy_from_user (&param, arg_pointer, sizeof(ioctl_general_t));
 207                         if (nIgnoredBytes > 0) {
 208                                 result = -1;
 209                                 break;
 210                         }
 211                         if(SetECMode(param.m_unsignedLong) == -1) {
 212                                 result = -1;
 213                                 break;
 214                         }
 215                         result = 0;
 216                         DPRINTF("Set EC Mode = %lu", param.m_unsignedLong);
 217                         break;
 218                 }
 219         case EC_IOCTL_GET_EC_MODE:
 220                 {
 221                         ioctl_general_t param;
 222                         unsigned long nIgnoredBytes = 0;
 223                         memset(&param, '0', sizeof(ioctl_general_t));
 224                         param.m_unsignedLong = GetECMode();
 225                         nIgnoredBytes = copy_to_user (arg_pointer, &param, sizeof (ioctl_general_t));
 226                         if (nIgnoredBytes > 0) {
 227                                 result = -1;
 228                                 break;
 229                         }
 230                         result = 0;
 231 //                      DPRINTF("Get EC Mode = %lu", param.m_unsignedLong);  // Frequent call
 232                         break;
 233                 }
 234         case EC_IOCTL_SET_BUFFER_SIZE:
 235                 {
 236                         ioctl_general_t param;
 237                         unsigned long nIgnoredBytes = 0;
 238                         memset(&param, '0', sizeof(ioctl_general_t));
 239                         nIgnoredBytes = copy_from_user (&param, arg_pointer, sizeof(ioctl_general_t));
 240                         if (nIgnoredBytes > 0) {
 241                                 result = -1;
 242                                 break;
 243                         }
 244                         if (SetBufferSize(param.m_unsignedLong) == -1) {
 245                                 result = -1;
 246                                 break;
 247                         }
 248                         result = 0;
 249                         DPRINTF("Set Buffer Size = %lu", param.m_unsignedLong);
 250                         break;
 251                 }
 252         case EC_IOCTL_GET_BUFFER_SIZE:
 253                 {
 254                         ioctl_general_t param;
 255                         unsigned long nIgnoredBytes = 0;
 256                         memset(&param, '0', sizeof(ioctl_general_t));
 257                         param.m_unsignedLong = GetBufferSize();
 258                         nIgnoredBytes = copy_to_user (arg_pointer, &param, sizeof (ioctl_general_t));
 259                         if (nIgnoredBytes > 0) {
 260                                 result = -1;
 261                                 break;
 262                         }
 263                         result = 0;
 264                         DPRINTF("Get Buffer Size = %lu", param.m_unsignedLong);
 265                         break;
 266                 }
 267         case EC_IOCTL_RESET_BUFFER:
 268                 {
 269                         if (ResetBuffer() == -1) {
 270                                 result = -1;
 271                                 break;
 272                         }
 273                         result = 0;
 274                         DPRINTF("Reset Buffer");
 275                         break;
 276                 }
 277         case EC_IOCTL_GET_EC_INFO:
 278                 {
 279                         if (copy_ec_info_to_user_space ((ec_info_t *) arg) != 0) {
 280                                 result = -1;
 281                                 break;
 282                         }
 283                         result = 0;
 284 //                      DPRINTF("Get Buffer Status"); // Frequent call
 285                         break;
 286                 }
 287         case EC_IOCTL_CONSUME_BUFFER:
 288                 {
 289                         static ec_info_t ec_info_copy;
 290                         int nIgnoredBytes = 0;
 291
 292                         nIgnoredBytes = copy_from_user (&ec_info_copy, (const void __user *) arg, sizeof (ec_info_t));
 293                         if(nIgnoredBytes > 0)
 294                         {
 295                                 EPRINTF ("copy_from_user(%08X,%08X)=%d", (unsigned) arg, (unsigned) &ec_info_copy, nIgnoredBytes);
 296                                 result = -1;
 297                                 break;
 298                         }
 299
 300                         spin_lock_irqsave (&ec_spinlock, spinlock_flags);
 301
 302                         // Original buffer
 303                         if(ec_info.after_last > ec_info.first) {
 304                                 ec_info.buffer_effect = ec_info.buffer_size;
 305                         }
 306                         if (ec_info.after_last == ec_info.buffer_effect) {
 307                                  ec_info.first = 0;
 308                         } else {
 309                                  ec_info.first = ec_info_copy.after_last;
 310                         }
 311                         ec_info.trace_size = ec_info.trace_size - ec_info_copy.trace_size;
 312
 313                         spin_unlock_irqrestore (&ec_spinlock, spinlock_flags);
 314                         result = 0;
 315 //                      DPRINTF("Consume Buffer"); // Frequent call
 316                         break;
 317                 }
 318         case EC_IOCTL_ADD_PROBE:
 319                 {
 320                         unsigned long addr = arg;
 321                         result = add_probe(addr);
 322
 323                         break;
 324                 }
 325         //@AGv: remove_probe expects probe address instead of name
 326         /*case EC_IOCTL_REMOVE_PROBE:
 327                 {
 328                         char *probe_name = (char *) arg;
 329                         result = remove_probe (probe_name);
 330
 331                         break;
 332                 }*/
 333         case EC_IOCTL_SET_APPDEPS:
 334         {
 335                 size_t size;
 336                 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
 337                 if (result) {
 338                         EPRINTF("Cannot copy deps size!");
 339                         result = -1;
 340                         break;
 341                 }
 342                 DPRINTF("Deps size has been copied (%d)", size);
 343
 344                 if (size == 0) {
 345                         DPRINTF("Deps are size of 0");
 346                         break;
 347                 }
 348
 349                 deps = vmalloc(size);
 350                 if (deps == NULL) {
 351                         EPRINTF("Cannot alloc mem for deps!");
 352                         result = -1;
 353                         break;
 354                 }
 355                 DPRINTF("Mem for deps has been allocated");
 356
 357                 result = copy_from_user(deps, arg_pointer, size);
 358                 if (result) {
 359                         EPRINTF("Cannot copy deps!");
 360                         result = -1;
 361                         break;
 362                 }
 363                 DPRINTF("Deps has been copied successfully");
 364
 365                 break;
 366         }
 367         case EC_IOCTL_SET_PID:
 368         {
 369                 unsigned int _pid;
 370
 371                 result = copy_from_user(&_pid, arg_pointer, sizeof(unsigned int));
 372                 if (result) {
 373                         EPRINTF("Cannot copy pid!");
 374                         result = -1;
 375                         break;
 376                 }
 377
 378                 inst_pid = _pid;
 379
 380                 DPRINTF("EC_IOCTL_SET_PID pid:%d", inst_pid);
 381
 382                 break;
 383         }
 384         case EC_IOCTL_SET_PROFILEBUNDLE:
 385         {
 386                 size_t size;
 387
 388                 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
 389                 if (result) {
 390                         EPRINTF("Cannot copy bundle size!");
 391                         result = -1;
 392                         break;
 393                 }
 394                 DPRINTF("Bundle size has been copied");
 395
 396                 bundle = vmalloc(size);
 397                 if (bundle == NULL) {
 398                         EPRINTF("Cannot alloc mem for bundle!");
 399                         result = -1;
 400                         break;
 401                 }
 402                 DPRINTF("Mem for bundle has been alloced");
 403
 404                 result = copy_from_user(bundle, arg_pointer, size);
 405                 if (result) {
 406                         EPRINTF("Cannot copy bundle!");
 407                         result = -1;
 408                         break;
 409                 }
 410                 DPRINTF("Bundle has been copied successfully");
 411
 412                 last_error_buffer_initialize();
 413
 414                 if (link_bundle() == -1) {
 415                         EPRINTF("Cannot link profile bundle!");
 416                         result = -1;
 417                         break;
 418                 }
 419                 if (has_last_error() == -1) {
 420                         EPRINTF("last_error_buffer != NULL");
 421                         result = -1;
 422                 }
 423
 424                 break;
 425         }
 426         case EC_IOCTL_RESET_PROBES:
 427                 {
 428                         result = reset_probes();
 429
 430                         break;
 431                 }
 432         case EC_IOCTL_UPDATE_CONDS:
 433                 {
 434                         int args_cnt, i;
 435                         struct cond *c, *c_tmp, *p_cond;
 436                         unsigned char *p_data;
 437                         int err;
 438                         result = 0;
 439                         err = copy_from_user(&args_cnt, arg_pointer, sizeof(int));
 440                         if (err) {
 441                                 result = -1;
 442                                 break;
 443                         }
 444                         /* first, delete all the conds */
 445                         list_for_each_entry_safe(c, c_tmp, &cond_list.list, list) {
 446                                 list_del(&c->list);
 447                                 kfree(c);
 448                         }
 449                         /* second, add new conds */
 450                         p_data = (unsigned char *)(arg + sizeof(int));
 451                         for (i = 0; i < args_cnt; i++) {
 452                                 p_cond = kmalloc(sizeof(struct cond), GFP_KERNEL);
 453                                 if (!p_cond) {
 454                                         DPRINTF("Cannot alloc cond!");
 455                                         result = -1;
 456                                         break;
 457                                 }
 458                                 err = copy_from_user(&p_cond->tmpl, (const void __user *)p_data,
 459                                                 sizeof(struct event_tmpl));
 460                                 if (err) {
 461                                         DPRINTF("Cannot copy cond from user!");
 462                                         result = -1;
 463                                         break;
 464                                 }
 465                                 p_cond->applied = 0;
 466                                 list_add(&(p_cond->list), &(cond_list.list));
 467                                 p_data += sizeof(struct event_tmpl);
 468                         }
 469                         break;
 470                 }
 471         case EC_IOCTL_ATTACH:
 472                 {
 473                         unsigned long dbi_flags;
 474                         struct dbi_modules_handlers *local_mh;
 475                         struct dbi_modules_handlers_info *local_mhi;
 476                         int j;
 477                         dbi_module_callback dmc_start;
 478
 479                         // call "start"-callback for all modules according module priority
 480                         local_mh = get_dbi_modules_handlers();
 481                         spin_lock_irqsave(&local_mh->lock, dbi_flags);
 482                         for (j = 0; j <= MAX_PRIORITY; j++) {
 483                                 list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 484                                         if (local_mhi->dbi_module_priority_start == j) {
 485                                                 if (local_mhi->dbi_module_callback_start != NULL) {
 486                                                         printk("Started module callback (start) %s\n", local_mhi->dbi_module->name);
 487                                                         dmc_start = (dbi_module_callback )local_mhi->dbi_module_callback_start;
 488                                                         dmc_start();
 489                                                 }
 490                                         }
 491                                 }
 492                         }
 493                         spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 494
 495                         result = ec_user_attach ();
 496 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
 497                         DPRINTF("EC_IOCTL_ATTACH calling notification chain");
 498                         blocking_notifier_call_chain(&swap_notifier_list, EC_IOCTL_ATTACH, (void*)NULL);
 499 #endif
 500                         DPRINTF("Attach Probes");
 501                         break;
 502                 }
 503         case EC_IOCTL_ACTIVATE:
 504                 result = ec_user_activate ();
 505                 DPRINTF("Activate Probes");
 506                 break;
 507         case EC_IOCTL_STOP_AND_DETACH:
 508         {
 509                 unsigned long nIgnoredBytes = 0;
 510                 unsigned long dbi_flags;
 511                 struct dbi_modules_handlers *local_mh;
 512                 struct dbi_modules_handlers_info *local_mhi;
 513                 unsigned int local_module_refcount = 0;
 514                 int j;
 515                 dbi_module_callback dmc_stop;
 516
 517 #ifdef OVERHEAD_DEBUG
 518                 printk("\nswap_sum_time = %ld in kprobe_handler()\n", swap_sum_time);
 519                 printk("swap_sum_hit = %ld in kprobe_handler()\n", swap_sum_hit);
 520                 swap_sum_time = 0;
 521                 swap_sum_hit = 0;
 522 #endif
 523
 524                 printk("\n### imi_sum_time = %ld in install_mapped_ips()\n", imi_sum_time);
 525                 printk("### imi_sum_hit = %ld in install_mapped_ips()\n", imi_sum_hit);
 526
 527                 if (imi_sum_hit != 0) {
 528                         printk("### time = %ld in install_mapped_ips()\n", imi_sum_time/imi_sum_hit);
 529                 }
 530
 531                 imi_sum_time = 0;
 532                 imi_sum_hit = 0;
 533
 534                 local_mh = get_dbi_modules_handlers();
 535                 if(ec_user_stop() != 0) {
 536                         result = -1;
 537                         goto sad_cleanup;
 538                 }
 539                 nIgnoredBytes = copy_ec_info_to_user_space ((ec_info_t*)arg);
 540                 if(nIgnoredBytes > 0) {
 541                         result = -1;
 542                         goto sad_cleanup;
 543                 }
 544
 545                 sspt_procs_free_all();
 546
 547                 vfree(bundle);
 548                 result = 0;
 549                 DPRINTF("Stop and Detach Probes");
 550 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
 551                 DPRINTF("EC_IOCTL_STOP_AND_DETACH calling notification chain");
 552                 blocking_notifier_call_chain(&swap_notifier_list, EC_IOCTL_STOP_AND_DETACH, (void*)&gl_nNotifyTgid);
 553 #endif
 554                 // call "stop"-callback for all modules according module priority
 555                 spin_lock_irqsave(&local_mh->lock, dbi_flags);
 556                 for (j = 0; j <= MAX_PRIORITY; j++) {
 557                         list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 558                                 if (local_mhi->dbi_module_priority_stop == j) {
 559                                         if (local_mhi->dbi_module_callback_stop != NULL) {
 560                                                 printk("Started module callback (stop) %s\n", local_mhi->dbi_module->name);
 561                                                 dmc_stop = (dbi_module_callback )local_mhi->dbi_module_callback_stop;
 562                                                 dmc_stop();
 563                                         }
 564                                 }
 565                         }
 566                 }
 567                 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 568 sad_cleanup:
 569                 spin_lock_irqsave(&local_mh->lock, dbi_flags);
 570                 list_for_each_entry_rcu(local_mhi, &local_mh->modules_handlers, dbi_list_head) {
 571                         local_module_refcount = module_refcount(local_mhi->dbi_module);
 572                         if (local_module_refcount == 1) {
 573                                 module_put(local_mhi->dbi_module);
 574                         }
 575                         else if (local_module_refcount > 1) {
 576                                 printk("local_module_refcount too much - force set refcount to zero\n");
 577                                 while (local_module_refcount--)
 578                                         module_put(local_mhi->dbi_module);
 579                         }
 580                 }
 581                 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
 582                 break;
 583         }
 584         case EC_IOCTL_US_EVENT:
 585                 {
 586                         ioctl_us_event_t ioctl_args;
 587                         result = copy_from_user (&ioctl_args, (const void __user *) arg, sizeof (ioctl_args));
 588                         if (result)
 589                         {
 590                                 result = -1;
 591                                 EPRINTF ("copy_from_user() failure");
 592                         }
 593                         else
 594                         {
 595                                 if(ioctl_args.len == 0){
 596                                         result = -EINVAL;
 597                                         EPRINTF ("invalid event length!");
 598                                 }
 599                                 else {
 600                                         char *buf = kmalloc(ioctl_args.len, GFP_KERNEL);
 601                                         if(!buf){
 602                                                 result = -ENOMEM;
 603                                                 EPRINTF ("failed to alloc mem for event!");
 604                                         }
 605                                         else {
 606                                                 result = copy_from_user (buf, (const void __user *) ioctl_args.data, ioctl_args.len);
 607                                                 if (result){
 608                                                         result = -1;
 609                                                         EPRINTF ("failed to copy event from user space!");
 610                                                 }
 611                                                 else
 612                                                         result = put_us_event(buf, ioctl_args.len);
 613                                                 kfree(buf);
 614                                         }
 615                                 }
 616                         }
 617 //                      DPRINTF("User Space Event"); // Frequent call
 618                         break;
 619                 }
 620
 621         case EC_IOCTL_SET_EVENT_MASK:
 622                 {
 623                         int mask;
 624                         result = copy_from_user (&mask, arg_pointer, sizeof (mask));
 625                         if (result)
 626                         {
 627                                 result = -EFAULT;
 628                                 break;
 629                         }
 630
 631                         result = set_event_mask (mask);
 632                         if (result)
 633                         {
 634                                 break;
 635                         }
 636                         DPRINTF("Set Event Mask = %d", mask);
 637                         break;
 638                 }
 639
 640         case EC_IOCTL_GET_EVENT_MASK:
 641                 {
 642                         int mask = 0;
 643                         result = get_event_mask(&mask);
 644                         if (result)
 645                         {
 646                                 result = -EFAULT;
 647                         }
 648                         result = copy_to_user (arg_pointer, &mask, sizeof (mask));
 649                         if (result)
 650                         {
 651                                 result = -EFAULT;
 652                         }
 653                         DPRINTF("Get Event Mask = %d", mask);
 654                         break;
 655                 }
 656
 657         case EC_IOCTL_GET_PREDEF_UPROBES:
 658                 {
 659                         result = get_predef_uprobes((ioctl_predef_uprobes_info_t *)arg);
 660                         if (result)
 661                         {
 662                                 result = -EFAULT;
 663                         }
 664                         DPRINTF("Get Predefined User Space Probes");
 665                         break;
 666                 }
 667
 668         case EC_IOCTL_GET_PREDEF_UPROBES_SIZE:
 669                 {
 670                         int size = 0;
 671                         result = get_predef_uprobes_size(&size);
 672                         if (result)
 673                         {
 674                                 result = -EFAULT;
 675                         }
 676                         result = copy_to_user (arg_pointer, &size, sizeof (size));
 677                         if (result)
 678                         {
 679                                 result = -EFAULT;
 680                         }
 681                         DPRINTF("Get Size of Predefined User Space Probes");
 682                         break;
 683                 }
 684         case EC_IOCTL_GET_LAST_ERROR:
 685                 {
 686                         result = get_last_error((void*)arg);
 687                         break;
 688                 }
 689         default:
 690                 EPRINTF ("Unknown driver command = %u", cmd);
 691                 result = -EINVAL;
 692                 break;
 693         }
 694
 695         return result;
 696 }