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183646e6 PMF |
1 | /* |
2 | * Copyright (C) 2005,2006 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
3 | * | |
4 | * This contains the core definitions for the Linux Trace Toolkit. | |
5 | */ | |
6 | ||
7 | #ifndef LTT_CORE_H | |
8 | #define LTT_CORE_H | |
9 | ||
10 | #include "list.h" | |
b6bf28ec | 11 | #include "kernelcompat.h" |
183646e6 PMF |
12 | //ust// #include <linux/percpu.h> |
13 | ||
14 | /* ltt's root dir in debugfs */ | |
15 | #define LTT_ROOT "ltt" | |
16 | ||
17 | /* | |
18 | * All modifications of ltt_traces must be done by ltt-tracer.c, while holding | |
19 | * the semaphore. Only reading of this information can be done elsewhere, with | |
20 | * the RCU mechanism : the preemption must be disabled while reading the | |
21 | * list. | |
22 | */ | |
23 | struct ltt_traces { | |
24 | struct list_head setup_head; /* Pre-allocated traces list */ | |
25 | struct list_head head; /* Allocated Traces list */ | |
26 | unsigned int num_active_traces; /* Number of active traces */ | |
27 | } ____cacheline_aligned; | |
28 | ||
29 | extern struct ltt_traces ltt_traces; | |
30 | ||
31 | /* | |
32 | * get dentry of ltt's root dir | |
33 | */ | |
34 | struct dentry *get_ltt_root(void); | |
35 | ||
36 | /* Keep track of trap nesting inside LTT */ | |
37 | //ust// DECLARE_PER_CPU(unsigned int, ltt_nesting); | |
bb07823d | 38 | extern unsigned int ltt_nesting; |
183646e6 PMF |
39 | |
40 | typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID); | |
1ae7f074 | 41 | //typedef int (*ltt_run_filter_functor)(void *, __u16); |
183646e6 PMF |
42 | |
43 | extern ltt_run_filter_functor ltt_run_filter; | |
44 | ||
45 | extern void ltt_filter_register(ltt_run_filter_functor func); | |
46 | extern void ltt_filter_unregister(void); | |
47 | ||
48 | #if defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT) | |
49 | ||
50 | /* | |
51 | * Calculate the offset needed to align the type. | |
52 | * size_of_type must be non-zero. | |
53 | */ | |
54 | static inline unsigned int ltt_align(size_t align_drift, size_t size_of_type) | |
55 | { | |
56 | size_t alignment = min(sizeof(void *), size_of_type); | |
57 | return (alignment - align_drift) & (alignment - 1); | |
58 | } | |
59 | /* Default arch alignment */ | |
60 | #define LTT_ALIGN | |
61 | ||
62 | static inline int ltt_get_alignment(void) | |
63 | { | |
64 | return sizeof(void *); | |
65 | } | |
66 | ||
67 | #else | |
68 | ||
69 | static inline unsigned int ltt_align(size_t align_drift, | |
70 | size_t size_of_type) | |
71 | { | |
72 | return 0; | |
73 | } | |
74 | ||
75 | #define LTT_ALIGN __attribute__((packed)) | |
76 | ||
77 | static inline int ltt_get_alignment(void) | |
78 | { | |
79 | return 0; | |
80 | } | |
81 | #endif /* defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT) */ | |
82 | ||
83 | #endif /* LTT_CORE_H */ |