1 ////////////////////////////////////////////////////////////////////////////////////
3 // FILE: device_driver.c
6 // This file is C source for SWAP driver.
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
14 // REVISION DATE: 2008.12.03
16 ////////////////////////////////////////////////////////////////////////////////////
19 #include "device_driver.h" // device driver
20 #include "handlers_core.h"
21 #include <linux/notifier.h>
22 #include "sspt/sspt_procs.h"
25 extern unsigned long swap_sum_time;
26 extern unsigned long swap_sum_hit;
30 extern unsigned long imi_sum_time;
31 extern unsigned long imi_sum_hit;
34 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
35 static BLOCKING_NOTIFIER_HEAD(swap_notifier_list);
38 EXPORT_SYMBOL_GPL(gl_nNotifyTgid);
40 static DECLARE_WAIT_QUEUE_HEAD (notification_waiters_queue);
41 static volatile unsigned notification_count;
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);
47 static long device_ioctl (struct file *file, unsigned int cmd, unsigned long arg);
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 *);
54 static int gl_nDeviceOpened = 0;
55 static struct file_operations device_fops = {
58 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 36)
59 .ioctl = device_ioctl,
61 .unlocked_ioctl = device_ioctl,
64 .write = device_write,
66 .release = device_release
69 typedef void (* dbi_module_callback)(void);
71 int device_init (void)
74 nReserved = register_chrdev(0, device_name, &device_fops);
77 unregister_chrdev(nReserved, device_name);
78 EPRINTF("Cannot register character device!");
81 EPRINTF("New device node with major number [%d], was created\n", nReserved);
82 device_major = nReserved;
86 void device_down (void)
88 unregister_chrdev(device_major, device_name);
91 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 17)
92 void swap_register_notify (struct notifier_block *nb)
94 blocking_notifier_chain_register(&swap_notifier_list, nb);
96 EXPORT_SYMBOL_GPL(swap_register_notify);
98 void swap_unregister_notify (struct notifier_block *nb)
100 blocking_notifier_chain_unregister(&swap_notifier_list, nb);
102 EXPORT_SYMBOL_GPL(swap_unregister_notify);
105 void notify_user (event_id_t event_id)
107 ec_info.events_counters[event_id] += 1;
109 if (EVENT_EC_PROBE_RECORD == event_id)
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;
115 uint64_t current_usec;
120 do_gettimeofday (&tv);
121 current_usec = 1000000ULL * (unsigned) tv.tv_sec + (unsigned) tv.tv_usec;
123 if (current_usec < timestamp_usec)
125 // Note: time from do_gettimeofday() may go backward
126 EPRINTF ("current_usec=%llu timestamp_usec=%llu", current_usec, timestamp_usec);
130 delta_usec = current_usec - timestamp_usec;
131 if (EVENTS_AGGREGATION_USEC > delta_usec)
133 // wait the time left
135 unsigned UNUSED left_usec = EVENTS_AGGREGATION_USEC - delta_usec;
136 #endif /* defined(__DEBUG) */
137 return; // supress notification
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
147 ++notification_count;
148 wake_up_interruptible (¬ification_waiters_queue);
151 static int device_mmap (struct file *filp UNUSED, struct vm_area_struct *vma)
154 EPRINTF("Null pointer to buffer!");
157 return remap_vmalloc_range (vma, p_buffer, 0);
160 static int device_open(struct inode *inode, struct file *file)
162 /*if (gl_nDeviceOpened)
166 try_module_get(THIS_MODULE);
170 static int device_release(struct inode *inode, struct file *file)
173 module_put(THIS_MODULE);
177 static ssize_t device_read(struct file *filp, char __user *buffer, size_t length, loff_t * offset)
179 EPRINTF("Operation <<read>> not supported!");
183 static ssize_t device_write(struct file *filp, const char __user *buff, size_t len, loff_t * off)
185 EPRINTF("Operation <<write>> not supported!");
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)
192 static long device_ioctl (struct file *file UNUSED, unsigned int cmd, unsigned long arg)
195 unsigned long spinlock_flags = 0L;
197 void __user * arg_pointer = (void __user *) arg;
198 // DPRINTF("Command=%d", cmd);
201 case EC_IOCTL_SET_EC_MODE:
203 ioctl_general_t param;
204 unsigned long nIgnoredBytes = 0;
205 memset(¶m, '0', sizeof(ioctl_general_t));
206 nIgnoredBytes = copy_from_user (¶m, arg_pointer, sizeof(ioctl_general_t));
207 if (nIgnoredBytes > 0) {
211 if(SetECMode(param.m_unsignedLong) == -1) {
216 DPRINTF("Set EC Mode = %lu", param.m_unsignedLong);
219 case EC_IOCTL_GET_EC_MODE:
221 ioctl_general_t param;
222 unsigned long nIgnoredBytes = 0;
223 memset(¶m, '0', sizeof(ioctl_general_t));
224 param.m_unsignedLong = GetECMode();
225 nIgnoredBytes = copy_to_user (arg_pointer, ¶m, sizeof (ioctl_general_t));
226 if (nIgnoredBytes > 0) {
231 // DPRINTF("Get EC Mode = %lu", param.m_unsignedLong); // Frequent call
234 case EC_IOCTL_SET_BUFFER_SIZE:
236 ioctl_general_t param;
237 unsigned long nIgnoredBytes = 0;
238 memset(¶m, '0', sizeof(ioctl_general_t));
239 nIgnoredBytes = copy_from_user (¶m, arg_pointer, sizeof(ioctl_general_t));
240 if (nIgnoredBytes > 0) {
244 if (SetBufferSize(param.m_unsignedLong) == -1) {
249 DPRINTF("Set Buffer Size = %lu", param.m_unsignedLong);
252 case EC_IOCTL_GET_BUFFER_SIZE:
254 ioctl_general_t param;
255 unsigned long nIgnoredBytes = 0;
256 memset(¶m, '0', sizeof(ioctl_general_t));
257 param.m_unsignedLong = GetBufferSize();
258 nIgnoredBytes = copy_to_user (arg_pointer, ¶m, sizeof (ioctl_general_t));
259 if (nIgnoredBytes > 0) {
264 DPRINTF("Get Buffer Size = %lu", param.m_unsignedLong);
267 case EC_IOCTL_RESET_BUFFER:
269 if (ResetBuffer() == -1) {
274 DPRINTF("Reset Buffer");
277 case EC_IOCTL_GET_EC_INFO:
279 if (copy_ec_info_to_user_space ((ec_info_t *) arg) != 0) {
284 // DPRINTF("Get Buffer Status"); // Frequent call
287 case EC_IOCTL_CONSUME_BUFFER:
289 static ec_info_t ec_info_copy;
290 int nIgnoredBytes = 0;
292 nIgnoredBytes = copy_from_user (&ec_info_copy, (const void __user *) arg, sizeof (ec_info_t));
293 if(nIgnoredBytes > 0)
295 EPRINTF ("copy_from_user(%08X,%08X)=%d", (unsigned) arg, (unsigned) &ec_info_copy, nIgnoredBytes);
300 spin_lock_irqsave (&ec_spinlock, spinlock_flags);
303 if(ec_info.after_last > ec_info.first) {
304 ec_info.buffer_effect = ec_info.buffer_size;
306 if (ec_info.after_last == ec_info.buffer_effect) {
309 ec_info.first = ec_info_copy.after_last;
311 ec_info.trace_size = ec_info.trace_size - ec_info_copy.trace_size;
313 spin_unlock_irqrestore (&ec_spinlock, spinlock_flags);
315 // DPRINTF("Consume Buffer"); // Frequent call
318 case EC_IOCTL_ADD_PROBE:
320 unsigned long addr = arg;
321 result = add_probe(addr);
325 //@AGv: remove_probe expects probe address instead of name
326 /*case EC_IOCTL_REMOVE_PROBE:
328 char *probe_name = (char *) arg;
329 result = remove_probe (probe_name);
333 case EC_IOCTL_SET_APPDEPS:
336 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
338 EPRINTF("Cannot copy deps size!");
342 DPRINTF("Deps size has been copied (%d)", size);
345 DPRINTF("Deps are size of 0");
349 deps = vmalloc(size);
351 EPRINTF("Cannot alloc mem for deps!");
355 DPRINTF("Mem for deps has been allocated");
357 result = copy_from_user(deps, arg_pointer, size);
359 EPRINTF("Cannot copy deps!");
363 DPRINTF("Deps has been copied successfully");
367 case EC_IOCTL_SET_PID:
371 result = copy_from_user(&_pid, arg_pointer, sizeof(unsigned int));
373 EPRINTF("Cannot copy pid!");
380 DPRINTF("EC_IOCTL_SET_PID pid:%d", inst_pid);
384 case EC_IOCTL_SET_PROFILEBUNDLE:
388 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
390 EPRINTF("Cannot copy bundle size!");
394 DPRINTF("Bundle size has been copied");
396 bundle = vmalloc(size);
397 if (bundle == NULL) {
398 EPRINTF("Cannot alloc mem for bundle!");
402 DPRINTF("Mem for bundle has been alloced");
404 result = copy_from_user(bundle, arg_pointer, size);
406 EPRINTF("Cannot copy bundle!");
410 DPRINTF("Bundle has been copied successfully");
412 last_error_buffer_initialize();
414 if (link_bundle() == -1) {
415 EPRINTF("Cannot link profile bundle!");
419 if (has_last_error() == -1) {
420 EPRINTF("last_error_buffer != NULL");
426 case EC_IOCTL_RESET_PROBES:
428 result = reset_probes();
432 case EC_IOCTL_UPDATE_CONDS:
435 struct cond *c, *c_tmp, *p_cond;
436 unsigned char *p_data;
439 err = copy_from_user(&args_cnt, arg_pointer, sizeof(int));
444 /* first, delete all the conds */
445 list_for_each_entry_safe(c, c_tmp, &cond_list.list, list) {
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);
454 DPRINTF("Cannot alloc cond!");
458 err = copy_from_user(&p_cond->tmpl, (const void __user *)p_data,
459 sizeof(struct event_tmpl));
461 DPRINTF("Cannot copy cond from user!");
466 list_add(&(p_cond->list), &(cond_list.list));
467 p_data += sizeof(struct event_tmpl);
471 case EC_IOCTL_ATTACH:
473 unsigned long dbi_flags;
474 struct dbi_modules_handlers *local_mh;
475 struct dbi_modules_handlers_info *local_mhi;
477 dbi_module_callback dmc_start;
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;
493 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
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);
500 DPRINTF("Attach Probes");
503 case EC_IOCTL_ACTIVATE:
504 result = ec_user_activate ();
505 DPRINTF("Activate Probes");
507 case EC_IOCTL_STOP_AND_DETACH:
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;
515 dbi_module_callback dmc_stop;
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);
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);
527 if (imi_sum_hit != 0) {
528 printk("### time = %ld in install_mapped_ips()\n", imi_sum_time/imi_sum_hit);
534 local_mh = get_dbi_modules_handlers();
535 if(ec_user_stop() != 0) {
539 nIgnoredBytes = copy_ec_info_to_user_space ((ec_info_t*)arg);
540 if(nIgnoredBytes > 0) {
545 sspt_procs_free_all();
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);
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;
567 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
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);
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);
581 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
584 case EC_IOCTL_US_EVENT:
586 ioctl_us_event_t ioctl_args;
587 result = copy_from_user (&ioctl_args, (const void __user *) arg, sizeof (ioctl_args));
591 EPRINTF ("copy_from_user() failure");
595 if(ioctl_args.len == 0){
597 EPRINTF ("invalid event length!");
600 char *buf = kmalloc(ioctl_args.len, GFP_KERNEL);
603 EPRINTF ("failed to alloc mem for event!");
606 result = copy_from_user (buf, (const void __user *) ioctl_args.data, ioctl_args.len);
609 EPRINTF ("failed to copy event from user space!");
612 result = put_us_event(buf, ioctl_args.len);
617 // DPRINTF("User Space Event"); // Frequent call
621 case EC_IOCTL_SET_EVENT_MASK:
624 result = copy_from_user (&mask, arg_pointer, sizeof (mask));
631 result = set_event_mask (mask);
636 DPRINTF("Set Event Mask = %d", mask);
640 case EC_IOCTL_GET_EVENT_MASK:
643 result = get_event_mask(&mask);
648 result = copy_to_user (arg_pointer, &mask, sizeof (mask));
653 DPRINTF("Get Event Mask = %d", mask);
657 case EC_IOCTL_GET_PREDEF_UPROBES:
659 result = get_predef_uprobes((ioctl_predef_uprobes_info_t *)arg);
664 DPRINTF("Get Predefined User Space Probes");
668 case EC_IOCTL_GET_PREDEF_UPROBES_SIZE:
671 result = get_predef_uprobes_size(&size);
676 result = copy_to_user (arg_pointer, &size, sizeof (size));
681 DPRINTF("Get Size of Predefined User Space Probes");
684 case EC_IOCTL_GET_LAST_ERROR:
686 result = get_last_error((void*)arg);
690 EPRINTF ("Unknown driver command = %u", cmd);