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