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