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 EPRINTF("++ pre module_put");
174 module_put(THIS_MODULE);
175 EPRINTF("++ aft module_put");
179 static ssize_t device_read(struct file *filp, char __user *buffer, size_t length, loff_t * offset)
181 EPRINTF("Operation <<read>> not supported!");
185 static ssize_t device_write(struct file *filp, const char __user *buff, size_t len, loff_t * off)
187 EPRINTF("Operation <<write>> not supported!");
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)
194 static long device_ioctl (struct file *file UNUSED, unsigned int cmd, unsigned long arg)
197 unsigned long spinlock_flags = 0L;
199 void __user * arg_pointer = (void __user *) arg;
200 // DPRINTF("Command=%d", cmd);
203 case EC_IOCTL_SET_EC_MODE:
205 ioctl_general_t param;
206 unsigned long nIgnoredBytes = 0;
207 memset(¶m, '0', sizeof(ioctl_general_t));
208 nIgnoredBytes = copy_from_user (¶m, arg_pointer, sizeof(ioctl_general_t));
209 if (nIgnoredBytes > 0) {
213 if(SetECMode(param.m_unsignedLong) == -1) {
218 DPRINTF("Set EC Mode = %lu", param.m_unsignedLong);
221 case EC_IOCTL_GET_EC_MODE:
223 ioctl_general_t param;
224 unsigned long nIgnoredBytes = 0;
225 memset(¶m, '0', sizeof(ioctl_general_t));
226 param.m_unsignedLong = GetECMode();
227 nIgnoredBytes = copy_to_user (arg_pointer, ¶m, sizeof (ioctl_general_t));
228 if (nIgnoredBytes > 0) {
233 // DPRINTF("Get EC Mode = %lu", param.m_unsignedLong); // Frequent call
236 case EC_IOCTL_SET_BUFFER_SIZE:
238 ioctl_general_t param;
239 unsigned long nIgnoredBytes = 0;
240 memset(¶m, '0', sizeof(ioctl_general_t));
241 nIgnoredBytes = copy_from_user (¶m, arg_pointer, sizeof(ioctl_general_t));
242 if (nIgnoredBytes > 0) {
246 if (SetBufferSize(param.m_unsignedLong) == -1) {
251 DPRINTF("Set Buffer Size = %lu", param.m_unsignedLong);
254 case EC_IOCTL_GET_BUFFER_SIZE:
256 ioctl_general_t param;
257 unsigned long nIgnoredBytes = 0;
258 memset(¶m, '0', sizeof(ioctl_general_t));
259 param.m_unsignedLong = GetBufferSize();
260 nIgnoredBytes = copy_to_user (arg_pointer, ¶m, sizeof (ioctl_general_t));
261 if (nIgnoredBytes > 0) {
266 DPRINTF("Get Buffer Size = %lu", param.m_unsignedLong);
269 case EC_IOCTL_RESET_BUFFER:
271 if (ResetBuffer() == -1) {
276 DPRINTF("Reset Buffer");
279 case EC_IOCTL_GET_EC_INFO:
281 if (copy_ec_info_to_user_space ((ec_info_t *) arg) != 0) {
286 // DPRINTF("Get Buffer Status"); // Frequent call
289 case EC_IOCTL_CONSUME_BUFFER:
291 static ec_info_t ec_info_copy;
292 int nIgnoredBytes = 0;
294 nIgnoredBytes = copy_from_user (&ec_info_copy, (const void __user *) arg, sizeof (ec_info_t));
295 if(nIgnoredBytes > 0)
297 EPRINTF ("copy_from_user(%08X,%08X)=%d", (unsigned) arg, (unsigned) &ec_info_copy, nIgnoredBytes);
302 spin_lock_irqsave (&ec_spinlock, spinlock_flags);
305 if(ec_info.after_last > ec_info.first) {
306 ec_info.buffer_effect = ec_info.buffer_size;
308 if (ec_info.after_last == ec_info.buffer_effect) {
311 ec_info.first = ec_info_copy.after_last;
313 ec_info.trace_size = ec_info.trace_size - ec_info_copy.trace_size;
315 spin_unlock_irqrestore (&ec_spinlock, spinlock_flags);
317 // DPRINTF("Consume Buffer"); // Frequent call
320 case EC_IOCTL_ADD_PROBE:
322 unsigned long addr = arg;
323 result = add_probe(addr);
327 //@AGv: remove_probe expects probe address instead of name
328 /*case EC_IOCTL_REMOVE_PROBE:
330 char *probe_name = (char *) arg;
331 result = remove_probe (probe_name);
335 case EC_IOCTL_SET_APPDEPS:
338 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
340 EPRINTF("Cannot copy deps size!");
344 DPRINTF("Deps size has been copied (%d)", size);
347 DPRINTF("Deps are size of 0");
351 deps = vmalloc(size);
353 EPRINTF("Cannot alloc mem for deps!");
357 DPRINTF("Mem for deps has been allocated");
359 result = copy_from_user(deps, arg_pointer, size);
361 EPRINTF("Cannot copy deps!");
365 DPRINTF("Deps has been copied successfully");
369 case EC_IOCTL_SET_PID:
373 result = copy_from_user(&_pid, arg_pointer, sizeof(unsigned int));
375 EPRINTF("Cannot copy pid!");
382 DPRINTF("EC_IOCTL_SET_PID pid:%d", inst_pid);
386 case EC_IOCTL_SET_PROFILEBUNDLE:
390 result = copy_from_user(&size, arg_pointer, sizeof(size_t));
392 EPRINTF("Cannot copy bundle size!");
396 DPRINTF("Bundle size has been copied");
398 bundle = vmalloc(size);
399 if (bundle == NULL) {
400 EPRINTF("Cannot alloc mem for bundle!");
404 DPRINTF("Mem for bundle has been alloced");
406 result = copy_from_user(bundle, arg_pointer, size);
408 EPRINTF("Cannot copy bundle!");
412 DPRINTF("Bundle has been copied successfully");
414 // last_error_buffer_initialize();
416 // printk(" --++@@ bef lb\n");
417 if (link_bundle() == -1 || has_last_error() == -1) {
418 EPRINTF("Cannot link profile bundle!");
422 // printk(" --++@@ bef has_last_error\n");
423 // if (has_last_error() == -1) {
424 // printk(" --++@@ in if\n");
425 // DPRINTF("last_error_buffer != NULL");
428 // printk(" --++@@ aft has_last_error\n");
432 case EC_IOCTL_RESET_PROBES:
434 result = reset_probes();
438 case EC_IOCTL_UPDATE_CONDS:
441 struct cond *c, *c_tmp, *p_cond;
442 unsigned char *p_data;
445 err = copy_from_user(&args_cnt, arg_pointer, sizeof(int));
450 /* first, delete all the conds */
451 list_for_each_entry_safe(c, c_tmp, &cond_list.list, list) {
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);
460 DPRINTF("Cannot alloc cond!");
464 err = copy_from_user(&p_cond->tmpl, (const void __user *)p_data,
465 sizeof(struct event_tmpl));
467 DPRINTF("Cannot copy cond from user!");
472 list_add(&(p_cond->list), &(cond_list.list));
473 p_data += sizeof(struct event_tmpl);
477 case EC_IOCTL_ATTACH:
479 unsigned long dbi_flags;
480 struct dbi_modules_handlers *local_mh;
481 struct dbi_modules_handlers_info *local_mhi;
483 dbi_module_callback dmc_start;
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;
499 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
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);
506 DPRINTF("Attach Probes");
509 case EC_IOCTL_ACTIVATE:
510 result = ec_user_activate ();
511 DPRINTF("Activate Probes");
513 case EC_IOCTL_STOP_AND_DETACH:
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;
521 dbi_module_callback dmc_stop;
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);
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);
533 if (imi_sum_hit != 0) {
534 printk("### time = %ld in install_mapped_ips()\n", imi_sum_time/imi_sum_hit);
540 local_mh = get_dbi_modules_handlers();
541 if(ec_user_stop() != 0) {
545 nIgnoredBytes = copy_ec_info_to_user_space ((ec_info_t*)arg);
546 if(nIgnoredBytes > 0) {
551 sspt_procs_free_all();
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);
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;
573 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
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);
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);
587 spin_unlock_irqrestore(&local_mh->lock, dbi_flags);
590 case EC_IOCTL_US_EVENT:
592 ioctl_us_event_t ioctl_args;
593 result = copy_from_user (&ioctl_args, (const void __user *) arg, sizeof (ioctl_args));
597 EPRINTF ("copy_from_user() failure");
601 if(ioctl_args.len == 0){
603 EPRINTF ("invalid event length!");
606 char *buf = kmalloc(ioctl_args.len, GFP_KERNEL);
609 EPRINTF ("failed to alloc mem for event!");
612 result = copy_from_user (buf, (const void __user *) ioctl_args.data, ioctl_args.len);
615 EPRINTF ("failed to copy event from user space!");
618 result = put_us_event(buf, ioctl_args.len);
623 // DPRINTF("User Space Event"); // Frequent call
627 case EC_IOCTL_SET_EVENT_MASK:
630 result = copy_from_user (&mask, arg_pointer, sizeof (mask));
637 result = set_event_mask (mask);
642 DPRINTF("Set Event Mask = %d", mask);
646 case EC_IOCTL_GET_EVENT_MASK:
649 result = get_event_mask(&mask);
654 result = copy_to_user (arg_pointer, &mask, sizeof (mask));
659 DPRINTF("Get Event Mask = %d", mask);
663 case EC_IOCTL_GET_PREDEF_UPROBES:
665 result = get_predef_uprobes((ioctl_predef_uprobes_info_t *)arg);
670 DPRINTF("Get Predefined User Space Probes");
674 case EC_IOCTL_GET_PREDEF_UPROBES_SIZE:
677 result = get_predef_uprobes_size(&size);
682 result = copy_to_user (arg_pointer, &size, sizeof (size));
687 DPRINTF("Get Size of Predefined User Space Probes");
690 case EC_IOCTL_GET_LAST_ERROR:
692 result = get_last_error((void*)arg);
693 DPRINTF("Get last error buffer");
697 EPRINTF ("Unknown driver command = %u", cmd);