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1c8284eb MD |
1 | /* |
2 | * ltt/ltt-event-header.c | |
3 | * | |
4 | * (C) Copyright 2010 - Mathieu Desnoyers (mathieu.desnoyers@efficios.com) | |
5 | * | |
6 | * LTTng event header. | |
7 | * | |
8 | * Author: | |
9 | * Mathieu Desnoyers (mathieu.desnoyers@efficios.com) | |
10 | * | |
11 | * Dual LGPL v2.1/GPL v2 license. | |
12 | */ | |
13 | ||
14 | #include <linux/module.h> | |
15 | ||
16 | #include "ltt-tracer.h" | |
17 | #include "ltt-relay.h" | |
18 | ||
19 | size_t ltt_write_event_header_slow(struct ltt_chanbuf_alloc *bufa, | |
20 | struct ltt_chan_alloc *chana, | |
21 | long buf_offset, u16 eID, u32 event_size, | |
22 | u64 tsc, unsigned int rflags) | |
23 | { | |
24 | struct ltt_event_header header; | |
25 | u16 small_size; | |
26 | ||
27 | switch (rflags) { | |
28 | case LTT_RFLAG_ID_SIZE_TSC: | |
29 | header.id_time = 29 << LTT_TSC_BITS; | |
30 | break; | |
31 | case LTT_RFLAG_ID_SIZE: | |
32 | header.id_time = 30 << LTT_TSC_BITS; | |
33 | break; | |
34 | case LTT_RFLAG_ID: | |
35 | header.id_time = 31 << LTT_TSC_BITS; | |
36 | break; | |
37 | default: | |
38 | WARN_ON_ONCE(1); | |
39 | header.id_time = 0; | |
40 | } | |
41 | ||
42 | header.id_time |= (u32)tsc & LTT_TSC_MASK; | |
43 | ltt_relay_write(bufa, chana, buf_offset, &header, sizeof(header)); | |
44 | buf_offset += sizeof(header); | |
45 | ||
46 | switch (rflags) { | |
47 | case LTT_RFLAG_ID_SIZE_TSC: | |
48 | small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE); | |
49 | ltt_relay_write(bufa, chana, buf_offset, | |
50 | &eID, sizeof(u16)); | |
51 | buf_offset += sizeof(u16); | |
52 | ltt_relay_write(bufa, chana, buf_offset, | |
53 | &small_size, sizeof(u16)); | |
54 | buf_offset += sizeof(u16); | |
55 | if (small_size == LTT_MAX_SMALL_SIZE) { | |
56 | ltt_relay_write(bufa, chana, buf_offset, | |
57 | &event_size, sizeof(u32)); | |
58 | buf_offset += sizeof(u32); | |
59 | } | |
60 | buf_offset += ltt_align(buf_offset, sizeof(u64)); | |
61 | ltt_relay_write(bufa, chana, buf_offset, | |
62 | &tsc, sizeof(u64)); | |
63 | buf_offset += sizeof(u64); | |
64 | break; | |
65 | case LTT_RFLAG_ID_SIZE: | |
66 | small_size = (u16)min_t(u32, event_size, LTT_MAX_SMALL_SIZE); | |
67 | ltt_relay_write(bufa, chana, buf_offset, | |
68 | &eID, sizeof(u16)); | |
69 | buf_offset += sizeof(u16); | |
70 | ltt_relay_write(bufa, chana, buf_offset, | |
71 | &small_size, sizeof(u16)); | |
72 | buf_offset += sizeof(u16); | |
73 | if (small_size == LTT_MAX_SMALL_SIZE) { | |
74 | ltt_relay_write(bufa, chana, buf_offset, | |
75 | &event_size, sizeof(u32)); | |
76 | buf_offset += sizeof(u32); | |
77 | } | |
78 | break; | |
79 | case LTT_RFLAG_ID: | |
80 | ltt_relay_write(bufa, chana, buf_offset, | |
81 | &eID, sizeof(u16)); | |
82 | buf_offset += sizeof(u16); | |
83 | break; | |
84 | } | |
85 | ||
86 | return buf_offset; | |
87 | } | |
88 | EXPORT_SYMBOL_GPL(ltt_write_event_header_slow); | |
89 | ||
90 | MODULE_LICENSE("GPL and additional rights"); | |
91 | MODULE_AUTHOR("Mathieu Desnoyers"); | |
92 | MODULE_DESCRIPTION("Linux Trace Toolkit Next Generation Event Header"); |