projects / lttng-ust.git / blame
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1 | #ifndef _LTT_CHANNELS_H |
| 2 | #define _LTT_CHANNELS_H | |
| 3 | ||
| 4 | /* | |
| 5 | * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
| 6 | * | |
| 7 | * Dynamic tracer channel allocation. | |
| 8 | */ | |
| 9 | ||
| 10 | #include <linux/limits.h> | |
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11 | //ust// #include <linux/kref.h> |
| 12 | //ust// #include <linux/list.h> | |
| b6bf28ec | 13 | #include <errno.h> |
| 59b161cd | 14 | |
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15 | #include "kernelcompat.h" |
| 16 | #include "kref.h" | |
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17 | |
| 18 | #define EVENTS_PER_CHANNEL 65536 | |
| 19 | ||
| 20 | struct ltt_trace_struct; | |
| 21 | struct rchan_buf; | |
| 22 | ||
| 23 | struct ltt_channel_struct { | |
| 24 | /* First 32 bytes cache-hot cacheline */ | |
| 25 | struct ltt_trace_struct *trace; | |
| 26 | void *buf; | |
| 27 | void *trans_channel_data; | |
| 28 | int overwrite:1; | |
| 29 | int active:1; | |
| 30 | unsigned int n_subbufs_order; | |
| 31 | unsigned long commit_count_mask; /* | |
| 32 | * Commit count mask, removing | |
| 33 | * the MSBs corresponding to | |
| 34 | * bits used to represent the | |
| 35 | * subbuffer index. | |
| 36 | */ | |
| 37 | /* End of first 32 bytes cacheline */ | |
| 38 | ||
| 39 | /* | |
| 40 | * buffer_begin - called on buffer-switch to a new sub-buffer | |
| 41 | * @buf: the channel buffer containing the new sub-buffer | |
| 42 | */ | |
| 43 | void (*buffer_begin) (struct rchan_buf *buf, | |
| 44 | u64 tsc, unsigned int subbuf_idx); | |
| 45 | /* | |
| 46 | * buffer_end - called on buffer-switch to a new sub-buffer | |
| 47 | * @buf: the channel buffer containing the previous sub-buffer | |
| 48 | */ | |
| 49 | void (*buffer_end) (struct rchan_buf *buf, | |
| 50 | u64 tsc, unsigned int offset, unsigned int subbuf_idx); | |
| 51 | struct kref kref; /* Channel transport reference count */ | |
| 52 | unsigned int subbuf_size; | |
| 53 | unsigned int subbuf_cnt; | |
| 54 | const char *channel_name; | |
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55 | |
| 56 | int buf_shmid; | |
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57 | } ____cacheline_aligned; |
| 58 | ||
| 59 | struct ltt_channel_setting { | |
| 60 | unsigned int subbuf_size; | |
| 61 | unsigned int subbuf_cnt; | |
| 62 | struct kref kref; /* Number of references to structure content */ | |
| 63 | struct list_head list; | |
| 64 | unsigned int index; /* index of channel in trace channel array */ | |
| 65 | u16 free_event_id; /* Next event ID to allocate */ | |
| 66 | char name[PATH_MAX]; | |
| 67 | }; | |
| 68 | ||
| 69 | int ltt_channels_register(const char *name); | |
| 70 | int ltt_channels_unregister(const char *name); | |
| 71 | int ltt_channels_set_default(const char *name, | |
| 72 | unsigned int subbuf_size, | |
| 73 | unsigned int subbuf_cnt); | |
| 74 | const char *ltt_channels_get_name_from_index(unsigned int index); | |
| 75 | int ltt_channels_get_index_from_name(const char *name); | |
| 76 | struct ltt_channel_struct *ltt_channels_trace_alloc(unsigned int *nr_channels, | |
| 77 | int overwrite, | |
| 78 | int active); | |
| 79 | void ltt_channels_trace_free(struct ltt_channel_struct *channels); | |
| 80 | int _ltt_channels_get_event_id(const char *channel, const char *name); | |
| 81 | int ltt_channels_get_event_id(const char *channel, const char *name); | |
| 82 | ||
| 83 | #endif /* _LTT_CHANNELS_H */ |