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); |