| 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> |
| 11 | //ust// #include <linux/kref.h> |
| 12 | //ust// #include <linux/list.h> |
| 13 | #include <errno.h> |
| 14 | |
| 15 | #include "kernelcompat.h" |
| 16 | #include "kref.h" |
| 17 | #include "list.h" |
| 18 | |
| 19 | #define EVENTS_PER_CHANNEL 65536 |
| 20 | |
| 21 | struct ltt_trace_struct; |
| 22 | struct rchan_buf; |
| 23 | |
| 24 | struct ltt_channel_struct { |
| 25 | /* First 32 bytes cache-hot cacheline */ |
| 26 | struct ltt_trace_struct *trace; |
| 27 | void *buf; |
| 28 | void *trans_channel_data; |
| 29 | int overwrite:1; |
| 30 | int active:1; |
| 31 | unsigned int n_subbufs_order; |
| 32 | unsigned long commit_count_mask; /* |
| 33 | * Commit count mask, removing |
| 34 | * the MSBs corresponding to |
| 35 | * bits used to represent the |
| 36 | * subbuffer index. |
| 37 | */ |
| 38 | /* End of first 32 bytes cacheline */ |
| 39 | |
| 40 | /* |
| 41 | * buffer_begin - called on buffer-switch to a new sub-buffer |
| 42 | * @buf: the channel buffer containing the new sub-buffer |
| 43 | */ |
| 44 | void (*buffer_begin) (struct rchan_buf *buf, |
| 45 | u64 tsc, unsigned int subbuf_idx); |
| 46 | /* |
| 47 | * buffer_end - called on buffer-switch to a new sub-buffer |
| 48 | * @buf: the channel buffer containing the previous sub-buffer |
| 49 | */ |
| 50 | void (*buffer_end) (struct rchan_buf *buf, |
| 51 | u64 tsc, unsigned int offset, unsigned int subbuf_idx); |
| 52 | struct kref kref; /* Channel transport reference count */ |
| 53 | unsigned int subbuf_size; |
| 54 | unsigned int subbuf_cnt; |
| 55 | const char *channel_name; |
| 56 | |
| 57 | int buf_shmid; |
| 58 | } ____cacheline_aligned; |
| 59 | |
| 60 | struct ltt_channel_setting { |
| 61 | unsigned int subbuf_size; |
| 62 | unsigned int subbuf_cnt; |
| 63 | struct kref kref; /* Number of references to structure content */ |
| 64 | struct list_head list; |
| 65 | unsigned int index; /* index of channel in trace channel array */ |
| 66 | u16 free_event_id; /* Next event ID to allocate */ |
| 67 | char name[PATH_MAX]; |
| 68 | }; |
| 69 | |
| 70 | int ltt_channels_register(const char *name); |
| 71 | int ltt_channels_unregister(const char *name); |
| 72 | int ltt_channels_set_default(const char *name, |
| 73 | unsigned int subbuf_size, |
| 74 | unsigned int subbuf_cnt); |
| 75 | const char *ltt_channels_get_name_from_index(unsigned int index); |
| 76 | int ltt_channels_get_index_from_name(const char *name); |
| 77 | struct ltt_channel_struct *ltt_channels_trace_alloc(unsigned int *nr_channels, |
| 78 | int overwrite, |
| 79 | int active); |
| 80 | void ltt_channels_trace_free(struct ltt_channel_struct *channels); |
| 81 | int _ltt_channels_get_event_id(const char *channel, const char *name); |
| 82 | int ltt_channels_get_event_id(const char *channel, const char *name); |
| 83 | |
| 84 | #endif /* _LTT_CHANNELS_H */ |