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1 | #ifndef UST_CHANNELS_H |
2 | #define UST_CHANNELS_H | |
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3 | |
4 | /* | |
5 | * Copyright (C) 2008 Mathieu Desnoyers (mathieu.desnoyers@polymtl.ca) | |
6 | * | |
7 | * Dynamic tracer channel allocation. | |
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8 | * |
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. | |
13 | * | |
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. | |
18 | * | |
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 | |
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22 | */ |
23 | ||
24 | #include <linux/limits.h> | |
b6bf28ec | 25 | #include <errno.h> |
59b161cd | 26 | |
fbca6b62 | 27 | #include <ust/kernelcompat.h> |
79d4d545 | 28 | #include <kcompat/kref.h> |
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29 | |
30 | #define EVENTS_PER_CHANNEL 65536 | |
204141ee | 31 | #define MAX_CPUS 32 |
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32 | |
33 | struct ltt_trace_struct; | |
99054cee | 34 | |
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35 | struct ust_buffer; |
36 | ||
37 | struct ust_channel { | |
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38 | /* First 32 bytes cache-hot cacheline */ |
39 | struct ltt_trace_struct *trace; | |
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40 | int *buf_struct_shmids; |
41 | struct ust_buffer **buf; | |
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42 | int overwrite:1; |
43 | int active:1; | |
44 | unsigned int n_subbufs_order; | |
45 | unsigned long commit_count_mask; /* | |
46 | * Commit count mask, removing | |
47 | * the MSBs corresponding to | |
48 | * bits used to represent the | |
49 | * subbuffer index. | |
50 | */ | |
51 | /* End of first 32 bytes cacheline */ | |
52 | ||
53 | /* | |
54 | * buffer_begin - called on buffer-switch to a new sub-buffer | |
55 | * @buf: the channel buffer containing the new sub-buffer | |
56 | */ | |
b5b073e2 | 57 | void (*buffer_begin) (struct ust_buffer *buf, |
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58 | u64 tsc, unsigned int subbuf_idx); |
59 | /* | |
60 | * buffer_end - called on buffer-switch to a new sub-buffer | |
61 | * @buf: the channel buffer containing the previous sub-buffer | |
62 | */ | |
b5b073e2 | 63 | void (*buffer_end) (struct ust_buffer *buf, |
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64 | u64 tsc, unsigned int offset, unsigned int subbuf_idx); |
65 | struct kref kref; /* Channel transport reference count */ | |
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66 | size_t subbuf_size; |
67 | int subbuf_size_order; | |
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68 | unsigned int subbuf_cnt; |
69 | const char *channel_name; | |
204141ee | 70 | int n_cpus; |
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71 | |
72 | u32 version; | |
73 | size_t alloc_size; | |
74 | struct list_head list; | |
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75 | } ____cacheline_aligned; |
76 | ||
77 | struct ltt_channel_setting { | |
78 | unsigned int subbuf_size; | |
79 | unsigned int subbuf_cnt; | |
80 | struct kref kref; /* Number of references to structure content */ | |
81 | struct list_head list; | |
82 | unsigned int index; /* index of channel in trace channel array */ | |
83 | u16 free_event_id; /* Next event ID to allocate */ | |
84 | char name[PATH_MAX]; | |
85 | }; | |
86 | ||
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87 | extern int ltt_channels_register(const char *name); |
88 | extern int ltt_channels_unregister(const char *name); | |
89 | extern int ltt_channels_set_default(const char *name, | |
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90 | unsigned int subbuf_size, |
91 | unsigned int subbuf_cnt); | |
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92 | extern const char *ltt_channels_get_name_from_index(unsigned int index); |
93 | extern int ltt_channels_get_index_from_name(const char *name); | |
b5b073e2 | 94 | extern struct ust_channel *ltt_channels_trace_alloc(unsigned int *nr_channels, |
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95 | int overwrite, |
96 | int active); | |
b5b073e2 | 97 | extern void ltt_channels_trace_free(struct ust_channel *channels); |
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98 | extern int _ltt_channels_get_event_id(const char *channel, const char *name); |
99 | extern int ltt_channels_get_event_id(const char *channel, const char *name); | |
99054cee | 100 | |
23e47a47 | 101 | #endif /* UST_CHANNELS_H */ |