5 * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca)
7 * Dynamic tracer channel allocation.
9 * This library is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
14 * This library is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with this library; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 #include <linux/limits.h>
27 #include <ust/kernelcompat.h>
28 #include <kcompat/kref.h>
30 #define EVENTS_PER_CHANNEL 65536
32 struct ltt_trace_struct
;
37 /* First 32 bytes cache-hot cacheline */
38 struct ltt_trace_struct
*trace
;
42 unsigned int n_subbufs_order
;
43 unsigned long commit_count_mask
; /*
44 * Commit count mask, removing
45 * the MSBs corresponding to
46 * bits used to represent the
49 /* End of first 32 bytes cacheline */
52 * buffer_begin - called on buffer-switch to a new sub-buffer
53 * @buf: the channel buffer containing the new sub-buffer
55 void (*buffer_begin
) (struct ust_buffer
*buf
,
56 u64 tsc
, unsigned int subbuf_idx
);
58 * buffer_end - called on buffer-switch to a new sub-buffer
59 * @buf: the channel buffer containing the previous sub-buffer
61 void (*buffer_end
) (struct ust_buffer
*buf
,
62 u64 tsc
, unsigned int offset
, unsigned int subbuf_idx
);
63 struct kref kref
; /* Channel transport reference count */
65 int subbuf_size_order
;
66 unsigned int subbuf_cnt
;
67 const char *channel_name
;
73 struct list_head list
;
74 } ____cacheline_aligned
;
76 struct ltt_channel_setting
{
77 unsigned int subbuf_size
;
78 unsigned int subbuf_cnt
;
79 struct kref kref
; /* Number of references to structure content */
80 struct list_head list
;
81 unsigned int index
; /* index of channel in trace channel array */
82 u16 free_event_id
; /* Next event ID to allocate */
86 extern int ltt_channels_register(const char *name
);
87 extern int ltt_channels_unregister(const char *name
);
88 extern int ltt_channels_set_default(const char *name
,
89 unsigned int subbuf_size
,
90 unsigned int subbuf_cnt
);
91 extern const char *ltt_channels_get_name_from_index(unsigned int index
);
92 extern int ltt_channels_get_index_from_name(const char *name
);
93 extern struct ust_channel
*ltt_channels_trace_alloc(unsigned int *nr_channels
,
96 extern void ltt_channels_trace_free(struct ust_channel
*channels
);
97 extern int _ltt_channels_get_event_id(const char *channel
, const char *name
);
98 extern int ltt_channels_get_event_id(const char *channel
, const char *name
);
100 #endif /* UST_CHANNELS_H */
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