projects / ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 9dad1eb8 PMF |
1 | /* |
| 2 | * LTT core in-kernel infrastructure. | |
| 3 | * | |
| 4 | * Copyright 2006 - Mathieu Desnoyers mathieu.desnoyers@polymtl.ca | |
| 5 | * | |
| 6 | * Distributed under the GPL license | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/ltt-core.h> | |
| 10 | #include <linux/percpu.h> | |
| 11 | #include <linux/module.h> | |
| 12 | #include <linux/debugfs.h> | |
| 13 | ||
| 14 | /* Traces structures */ | |
| 15 | struct ltt_traces ltt_traces = { | |
| 16 | .setup_head = LIST_HEAD_INIT(ltt_traces.setup_head), | |
| 17 | .head = LIST_HEAD_INIT(ltt_traces.head), | |
| 18 | }; | |
| 19 | EXPORT_SYMBOL(ltt_traces); | |
| 20 | ||
| 21 | /* Traces list writer locking */ | |
| 22 | static DEFINE_MUTEX(ltt_traces_mutex); | |
| 23 | ||
| 24 | /* dentry of ltt's root dir */ | |
| 25 | static struct dentry *ltt_root_dentry; | |
| 26 | struct dentry *get_ltt_root(void) | |
| 27 | { | |
| 28 | if (!ltt_root_dentry) { | |
| 29 | ltt_root_dentry = debugfs_create_dir(LTT_ROOT, NULL); | |
| 30 | if (!ltt_root_dentry) | |
| 31 | printk(KERN_ERR "LTT : create ltt root dir failed\n"); | |
| 32 | } | |
| 33 | return ltt_root_dentry; | |
| 34 | } | |
| 35 | EXPORT_SYMBOL_GPL(get_ltt_root); | |
| 36 | ||
| 37 | void ltt_lock_traces(void) | |
| 38 | { | |
| 39 | mutex_lock(<t_traces_mutex); | |
| 40 | } | |
| 41 | EXPORT_SYMBOL_GPL(ltt_lock_traces); | |
| 42 | ||
| 43 | void ltt_unlock_traces(void) | |
| 44 | { | |
| 45 | mutex_unlock(<t_traces_mutex); | |
| 46 | } | |
| 47 | EXPORT_SYMBOL_GPL(ltt_unlock_traces); | |
| 48 | ||
| 49 | DEFINE_PER_CPU(unsigned int, ltt_nesting); | |
| 50 | EXPORT_PER_CPU_SYMBOL(ltt_nesting); | |
| 51 | ||
| 52 | int ltt_run_filter_default(void *trace, uint16_t eID) | |
| 53 | { | |
| 54 | return 1; | |
| 55 | } | |
| 56 | ||
| 57 | /* This function pointer is protected by a trace activation check */ | |
| 58 | ltt_run_filter_functor ltt_run_filter = ltt_run_filter_default; | |
| 59 | EXPORT_SYMBOL_GPL(ltt_run_filter); | |
| 60 | ||
| 61 | void ltt_filter_register(ltt_run_filter_functor func) | |
| 62 | { | |
| 63 | ltt_run_filter = func; | |
| 64 | } | |
| 65 | EXPORT_SYMBOL_GPL(ltt_filter_register); | |
| 66 | ||
| 67 | void ltt_filter_unregister(void) | |
| 68 | { | |
| 69 | ltt_run_filter = ltt_run_filter_default; | |
| 70 | } | |
| 71 | EXPORT_SYMBOL_GPL(ltt_filter_unregister); |