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1 | #ifndef _LINUX_RING_BUFFER_H |
2 | #define _LINUX_RING_BUFFER_H |
3 | |
4 | #include <linux/kmemcheck.h> |
5 | #include <linux/mm.h> |
6 | #include <linux/seq_file.h> |
7 | |
8 | struct ring_buffer; |
9 | struct ring_buffer_iter; |
10 | |
11 | /* |
12 | * Don't refer to this struct directly, use functions below. |
13 | */ |
14 | struct ring_buffer_event { |
15 | kmemcheck_bitfield_begin(bitfield); |
16 | u32 type_len:5, time_delta:27; |
17 | kmemcheck_bitfield_end(bitfield); |
18 | |
19 | u32 array[]; |
20 | }; |
21 | |
22 | /** |
23 | * enum ring_buffer_type - internal ring buffer types |
24 | * |
25 | * @RINGBUF_TYPE_PADDING: Left over page padding or discarded event |
26 | * If time_delta is 0: |
27 | * array is ignored |
28 | * size is variable depending on how much |
29 | * padding is needed |
30 | * If time_delta is non zero: |
31 | * array[0] holds the actual length |
32 | * size = 4 + length (bytes) |
33 | * |
34 | * @RINGBUF_TYPE_TIME_EXTEND: Extend the time delta |
35 | * array[0] = time delta (28 .. 59) |
36 | * size = 8 bytes |
37 | * |
38 | * @RINGBUF_TYPE_TIME_STAMP: Sync time stamp with external clock |
39 | * array[0] = tv_nsec |
40 | * array[1..2] = tv_sec |
41 | * size = 16 bytes |
42 | * |
43 | * <= @RINGBUF_TYPE_DATA_TYPE_LEN_MAX: |
44 | * Data record |
45 | * If type_len is zero: |
46 | * array[0] holds the actual length |
47 | * array[1..(length+3)/4] holds data |
48 | * size = 4 + length (bytes) |
49 | * else |
50 | * length = type_len << 2 |
51 | * array[0..(length+3)/4-1] holds data |
52 | * size = 4 + length (bytes) |
53 | */ |
54 | enum ring_buffer_type { |
55 | RINGBUF_TYPE_DATA_TYPE_LEN_MAX = 28, |
56 | RINGBUF_TYPE_PADDING, |
57 | RINGBUF_TYPE_TIME_EXTEND, |
58 | /* FIXME: RINGBUF_TYPE_TIME_STAMP not implemented */ |
59 | RINGBUF_TYPE_TIME_STAMP, |
60 | }; |
61 | |
62 | unsigned ring_buffer_event_length(struct ring_buffer_event *event); |
63 | void *ring_buffer_event_data(struct ring_buffer_event *event); |
64 | |
65 | /* |
66 | * ring_buffer_discard_commit will remove an event that has not |
67 | * ben committed yet. If this is used, then ring_buffer_unlock_commit |
68 | * must not be called on the discarded event. This function |
69 | * will try to remove the event from the ring buffer completely |
70 | * if another event has not been written after it. |
71 | * |
72 | * Example use: |
73 | * |
74 | * if (some_condition) |
75 | * ring_buffer_discard_commit(buffer, event); |
76 | * else |
77 | * ring_buffer_unlock_commit(buffer, event); |
78 | */ |
79 | void ring_buffer_discard_commit(struct ring_buffer *buffer, |
80 | struct ring_buffer_event *event); |
81 | |
82 | /* |
83 | * size is in bytes for each per CPU buffer. |
84 | */ |
85 | struct ring_buffer * |
86 | __ring_buffer_alloc(unsigned long size, unsigned flags, struct lock_class_key *key); |
87 | |
88 | /* |
89 | * Because the ring buffer is generic, if other users of the ring buffer get |
90 | * traced by ftrace, it can produce lockdep warnings. We need to keep each |
91 | * ring buffer's lock class separate. |
92 | */ |
93 | #define ring_buffer_alloc(size, flags) \ |
94 | ({ \ |
95 | static struct lock_class_key __key; \ |
96 | __ring_buffer_alloc((size), (flags), &__key); \ |
97 | }) |
98 | |
99 | void ring_buffer_free(struct ring_buffer *buffer); |
100 | |
101 | int ring_buffer_resize(struct ring_buffer *buffer, unsigned long size); |
102 | |
103 | void ring_buffer_change_overwrite(struct ring_buffer *buffer, int val); |
104 | |
105 | struct ring_buffer_event *ring_buffer_lock_reserve(struct ring_buffer *buffer, |
106 | unsigned long length); |
107 | int ring_buffer_unlock_commit(struct ring_buffer *buffer, |
108 | struct ring_buffer_event *event); |
109 | int ring_buffer_write(struct ring_buffer *buffer, |
110 | unsigned long length, void *data); |
111 | |
112 | struct ring_buffer_event * |
113 | ring_buffer_peek(struct ring_buffer *buffer, int cpu, u64 *ts, |
114 | unsigned long *lost_events); |
115 | struct ring_buffer_event * |
116 | ring_buffer_consume(struct ring_buffer *buffer, int cpu, u64 *ts, |
117 | unsigned long *lost_events); |
118 | |
119 | struct ring_buffer_iter * |
120 | ring_buffer_read_prepare(struct ring_buffer *buffer, int cpu); |
121 | void ring_buffer_read_prepare_sync(void); |
122 | void ring_buffer_read_start(struct ring_buffer_iter *iter); |
123 | void ring_buffer_read_finish(struct ring_buffer_iter *iter); |
124 | |
125 | struct ring_buffer_event * |
126 | ring_buffer_iter_peek(struct ring_buffer_iter *iter, u64 *ts); |
127 | struct ring_buffer_event * |
128 | ring_buffer_read(struct ring_buffer_iter *iter, u64 *ts); |
129 | void ring_buffer_iter_reset(struct ring_buffer_iter *iter); |
130 | int ring_buffer_iter_empty(struct ring_buffer_iter *iter); |
131 | |
132 | unsigned long ring_buffer_size(struct ring_buffer *buffer); |
133 | |
134 | void ring_buffer_reset_cpu(struct ring_buffer *buffer, int cpu); |
135 | void ring_buffer_reset(struct ring_buffer *buffer); |
136 | |
137 | #ifdef CONFIG_RING_BUFFER_ALLOW_SWAP |
138 | int ring_buffer_swap_cpu(struct ring_buffer *buffer_a, |
139 | struct ring_buffer *buffer_b, int cpu); |
140 | #else |
141 | static inline int |
142 | ring_buffer_swap_cpu(struct ring_buffer *buffer_a, |
143 | struct ring_buffer *buffer_b, int cpu) |
144 | { |
145 | return -ENODEV; |
146 | } |
147 | #endif |
148 | |
149 | int ring_buffer_empty(struct ring_buffer *buffer); |
150 | int ring_buffer_empty_cpu(struct ring_buffer *buffer, int cpu); |
151 | |
152 | void ring_buffer_record_disable(struct ring_buffer *buffer); |
153 | void ring_buffer_record_enable(struct ring_buffer *buffer); |
154 | void ring_buffer_record_disable_cpu(struct ring_buffer *buffer, int cpu); |
155 | void ring_buffer_record_enable_cpu(struct ring_buffer *buffer, int cpu); |
156 | |
157 | unsigned long ring_buffer_entries(struct ring_buffer *buffer); |
158 | unsigned long ring_buffer_overruns(struct ring_buffer *buffer); |
159 | unsigned long ring_buffer_entries_cpu(struct ring_buffer *buffer, int cpu); |
160 | unsigned long ring_buffer_overrun_cpu(struct ring_buffer *buffer, int cpu); |
161 | unsigned long ring_buffer_commit_overrun_cpu(struct ring_buffer *buffer, int cpu); |
162 | |
163 | u64 ring_buffer_time_stamp(struct ring_buffer *buffer, int cpu); |
164 | void ring_buffer_normalize_time_stamp(struct ring_buffer *buffer, |
165 | int cpu, u64 *ts); |
166 | void ring_buffer_set_clock(struct ring_buffer *buffer, |
167 | u64 (*clock)(void)); |
168 | |
169 | size_t ring_buffer_page_len(void *page); |
170 | |
171 | |
172 | void *ring_buffer_alloc_read_page(struct ring_buffer *buffer); |
173 | void ring_buffer_free_read_page(struct ring_buffer *buffer, void *data); |
174 | int ring_buffer_read_page(struct ring_buffer *buffer, void **data_page, |
175 | size_t len, int cpu, int full); |
176 | |
177 | struct trace_seq; |
178 | |
179 | int ring_buffer_print_entry_header(struct trace_seq *s); |
180 | int ring_buffer_print_page_header(struct trace_seq *s); |
181 | |
182 | enum ring_buffer_flags { |
183 | RB_FL_OVERWRITE = 1 << 0, |
184 | }; |
185 | |
186 | #endif /* _LINUX_RING_BUFFER_H */ |
187 |
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