| 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 | #include "kernelcompat.h" |
| 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); |
| 38 | extern unsigned int ltt_nesting; |
| 39 | |
| 40 | typedef int (*ltt_run_filter_functor)(void *trace, uint16_t eID); |
| 41 | |
| 42 | extern ltt_run_filter_functor ltt_run_filter; |
| 43 | |
| 44 | extern void ltt_filter_register(ltt_run_filter_functor func); |
| 45 | extern void ltt_filter_unregister(void); |
| 46 | |
| 47 | #if defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT) |
| 48 | |
| 49 | /* |
| 50 | * Calculate the offset needed to align the type. |
| 51 | * size_of_type must be non-zero. |
| 52 | */ |
| 53 | static inline unsigned int ltt_align(size_t align_drift, size_t size_of_type) |
| 54 | { |
| 55 | size_t alignment = min(sizeof(void *), size_of_type); |
| 56 | return (alignment - align_drift) & (alignment - 1); |
| 57 | } |
| 58 | /* Default arch alignment */ |
| 59 | #define LTT_ALIGN |
| 60 | |
| 61 | static inline int ltt_get_alignment(void) |
| 62 | { |
| 63 | return sizeof(void *); |
| 64 | } |
| 65 | |
| 66 | #else |
| 67 | |
| 68 | static inline unsigned int ltt_align(size_t align_drift, |
| 69 | size_t size_of_type) |
| 70 | { |
| 71 | return 0; |
| 72 | } |
| 73 | |
| 74 | #define LTT_ALIGN __attribute__((packed)) |
| 75 | |
| 76 | static inline int ltt_get_alignment(void) |
| 77 | { |
| 78 | return 0; |
| 79 | } |
| 80 | #endif /* defined(CONFIG_LTT) && defined(CONFIG_LTT_ALIGNMENT) */ |
| 81 | |
| 82 | #endif /* LTT_CORE_H */ |