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852c2936 MD |
1 | #ifndef _LINUX_RING_BUFFER_BACKEND_TYPES_H |
2 | #define _LINUX_RING_BUFFER_BACKEND_TYPES_H | |
3 | ||
4 | /* | |
5 | * linux/ringbuffer/backend_types.h | |
6 | * | |
7 | * Copyright (C) 2008-2010 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
8 | * | |
9 | * Ring buffer backend (types). | |
10 | * | |
11 | * Dual LGPL v2.1/GPL v2 license. | |
12 | */ | |
13 | ||
2fed87ae | 14 | #include <limits.h> |
1d498196 | 15 | #include "shm_internal.h" |
a3bb4b27 | 16 | #include "vatomic.h" |
852c2936 | 17 | |
4cfec15c | 18 | struct lttng_ust_lib_ring_buffer_backend_pages { |
852c2936 MD |
19 | unsigned long mmap_offset; /* offset of the subbuffer in mmap */ |
20 | union v_atomic records_commit; /* current records committed count */ | |
21 | union v_atomic records_unread; /* records to read */ | |
22 | unsigned long data_size; /* Amount of data to read from subbuf */ | |
a6352fd4 | 23 | DECLARE_SHMP(char, p); /* Backing memory map */ |
852c2936 MD |
24 | }; |
25 | ||
4cfec15c | 26 | struct lttng_ust_lib_ring_buffer_backend_subbuffer { |
852c2936 MD |
27 | /* Identifier for subbuf backend pages. Exchanged atomically. */ |
28 | unsigned long id; /* backend subbuffer identifier */ | |
29 | }; | |
30 | ||
31 | /* | |
32 | * Forward declaration of frontend-specific channel and ring_buffer. | |
33 | */ | |
34 | struct channel; | |
4cfec15c | 35 | struct lttng_ust_lib_ring_buffer; |
852c2936 | 36 | |
4cfec15c MD |
37 | struct lttng_ust_lib_ring_buffer_backend_pages_shmp { |
38 | DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_pages, shmp); | |
1d498196 MD |
39 | }; |
40 | ||
4cfec15c | 41 | struct lttng_ust_lib_ring_buffer_backend { |
852c2936 | 42 | /* Array of ring_buffer_backend_subbuffer for writer */ |
4cfec15c | 43 | DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_subbuffer, buf_wsb); |
852c2936 | 44 | /* ring_buffer_backend_subbuffer for reader */ |
4cfec15c | 45 | struct lttng_ust_lib_ring_buffer_backend_subbuffer buf_rsb; |
852c2936 MD |
46 | /* |
47 | * Pointer array of backend pages, for whole buffer. | |
48 | * Indexed by ring_buffer_backend_subbuffer identifier (id) index. | |
49 | */ | |
4cfec15c | 50 | DECLARE_SHMP(struct lttng_ust_lib_ring_buffer_backend_pages_shmp, array); |
a6352fd4 | 51 | DECLARE_SHMP(char, memory_map); /* memory mapping */ |
852c2936 | 52 | |
a6352fd4 | 53 | DECLARE_SHMP(struct channel, chan); /* Associated channel */ |
852c2936 MD |
54 | int cpu; /* This buffer's cpu. -1 if global. */ |
55 | union v_atomic records_read; /* Number of records read */ | |
7c2caf2b | 56 | unsigned int allocated:1; /* is buffer allocated ? */ |
852c2936 MD |
57 | }; |
58 | ||
4cfec15c MD |
59 | struct lttng_ust_lib_ring_buffer_shmp { |
60 | DECLARE_SHMP(struct lttng_ust_lib_ring_buffer, shmp); /* Channel per-cpu buffers */ | |
1d498196 MD |
61 | }; |
62 | ||
852c2936 MD |
63 | struct channel_backend { |
64 | unsigned long buf_size; /* Size of the buffer */ | |
65 | unsigned long subbuf_size; /* Sub-buffer size */ | |
66 | unsigned int subbuf_size_order; /* Order of sub-buffer size */ | |
67 | unsigned int num_subbuf_order; /* | |
68 | * Order of number of sub-buffers/buffer | |
69 | * for writer. | |
70 | */ | |
71 | unsigned int buf_size_order; /* Order of buffer size */ | |
7c2caf2b | 72 | unsigned int extra_reader_sb:1; /* has extra reader subbuffer ? */ |
852c2936 | 73 | unsigned long num_subbuf; /* Number of sub-buffers for writer */ |
2fed87ae | 74 | uint64_t start_tsc; /* Channel creation TSC value */ |
a3f61e7f | 75 | DECLARE_SHMP(void *, priv_data);/* Client-specific information */ |
4cfec15c | 76 | struct lttng_ust_lib_ring_buffer_config config; /* Ring buffer configuration */ |
852c2936 | 77 | char name[NAME_MAX]; /* Channel name */ |
4cfec15c | 78 | struct lttng_ust_lib_ring_buffer_shmp buf[]; |
852c2936 MD |
79 | }; |
80 | ||
81 | #endif /* _LINUX_RING_BUFFER_BACKEND_TYPES_H */ |