1c5c34fc786894d306a10f80ab14c2ade94de7fb
1 #ifndef _LTT_CHANNELS_H
2 #define _LTT_CHANNELS_H
5 * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
7 * Dynamic tracer channel allocation.
10 #include <linux/limits.h>
11 //ust// #include <linux/kref.h>
12 //ust// #include <linux/list.h>
15 #include "kernelcompat.h"
19 #define EVENTS_PER_CHANNEL 65536
21 struct ltt_trace_struct
;
24 struct ltt_channel_struct
{
25 /* First 32 bytes cache-hot cacheline */
26 struct ltt_trace_struct
*trace
;
28 void *trans_channel_data
;
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
38 /* End of first 32 bytes cacheline */
41 * buffer_begin - called on buffer-switch to a new sub-buffer
42 * @buf: the channel buffer containing the new sub-buffer
44 void (*buffer_begin
) (struct rchan_buf
*buf
,
45 u64 tsc
, unsigned int subbuf_idx
);
47 * buffer_end - called on buffer-switch to a new sub-buffer
48 * @buf: the channel buffer containing the previous sub-buffer
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 } ____cacheline_aligned
;
58 struct ltt_channel_setting
{
59 unsigned int subbuf_size
;
60 unsigned int subbuf_cnt
;
61 struct kref kref
; /* Number of references to structure content */
62 struct list_head list
;
63 unsigned int index
; /* index of channel in trace channel array */
64 u16 free_event_id
; /* Next event ID to allocate */
68 int ltt_channels_register(const char *name
);
69 int ltt_channels_unregister(const char *name
);
70 int ltt_channels_set_default(const char *name
,
71 unsigned int subbuf_size
,
72 unsigned int subbuf_cnt
);
73 const char *ltt_channels_get_name_from_index(unsigned int index
);
74 int ltt_channels_get_index_from_name(const char *name
);
75 struct ltt_channel_struct
*ltt_channels_trace_alloc(unsigned int *nr_channels
,
78 void ltt_channels_trace_free(struct ltt_channel_struct
*channels
);
79 int _ltt_channels_get_event_id(const char *channel
, const char *name
);
80 int ltt_channels_get_event_id(const char *channel
, const char *name
);
82 #endif /* _LTT_CHANNELS_H */
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