| 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"); |