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