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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> |
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26 | #include <ust/kcompat/kcompat.h> |
27 | #include <urcu/list.h> | |
28 | #include <ust/core.h> | |
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29 | |
30 | #define EVENTS_PER_CHANNEL 65536 | |
204141ee | 31 | #define MAX_CPUS 32 |
99054cee | 32 | |
b73a4c47 | 33 | struct ust_trace; |
99054cee | 34 | |
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35 | struct ust_buffer; |
36 | ||
37 | struct ust_channel { | |
99054cee | 38 | /* First 32 bytes cache-hot cacheline */ |
b73a4c47 | 39 | struct ust_trace *trace; |
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40 | int *buf_struct_shmids; |
41 | struct ust_buffer **buf; | |
99054cee | 42 | int overwrite:1; |
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43 | /* whether collection is requested upon trace start */ |
44 | int request_collection:1; | |
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45 | int active:1; |
46 | unsigned int n_subbufs_order; | |
47 | unsigned long commit_count_mask; /* | |
48 | * Commit count mask, removing | |
49 | * the MSBs corresponding to | |
50 | * bits used to represent the | |
51 | * subbuffer index. | |
52 | */ | |
53 | /* End of first 32 bytes cacheline */ | |
54 | ||
99054cee | 55 | struct kref kref; /* Channel transport reference count */ |
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56 | size_t subbuf_size; |
57 | int subbuf_size_order; | |
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58 | unsigned int subbuf_cnt; |
59 | const char *channel_name; | |
204141ee | 60 | int n_cpus; |
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61 | |
62 | u32 version; | |
63 | size_t alloc_size; | |
64 | struct list_head list; | |
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65 | } ____cacheline_aligned; |
66 | ||
67 | struct ltt_channel_setting { | |
68 | unsigned int subbuf_size; | |
69 | unsigned int subbuf_cnt; | |
70 | struct kref kref; /* Number of references to structure content */ | |
71 | struct list_head list; | |
72 | unsigned int index; /* index of channel in trace channel array */ | |
73 | u16 free_event_id; /* Next event ID to allocate */ | |
74 | char name[PATH_MAX]; | |
75 | }; | |
76 | ||
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77 | extern int ltt_channels_register(const char *name); |
78 | extern int ltt_channels_unregister(const char *name); | |
79 | extern int ltt_channels_set_default(const char *name, | |
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80 | unsigned int subbuf_size, |
81 | unsigned int subbuf_cnt); | |
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82 | extern const char *ltt_channels_get_name_from_index(unsigned int index); |
83 | extern int ltt_channels_get_index_from_name(const char *name); | |
b5b073e2 | 84 | extern struct ust_channel *ltt_channels_trace_alloc(unsigned int *nr_channels, |
99054cee | 85 | int overwrite, |
8649cd59 | 86 | int request_collection, |
99054cee | 87 | int active); |
b5b073e2 | 88 | extern void ltt_channels_trace_free(struct ust_channel *channels); |
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89 | extern int _ltt_channels_get_event_id(const char *channel, const char *name); |
90 | extern int ltt_channels_get_event_id(const char *channel, const char *name); | |
99054cee | 91 | |
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92 | extern int ust_channels_overwrite_by_default; |
93 | extern int ust_channels_request_collection_by_default; | |
94 | ||
23e47a47 | 95 | #endif /* UST_CHANNELS_H */ |