1#ifndef BLKTRACE_H 2#define BLKTRACE_H 3 4#include <linux/types.h> 5 6/* 7 * Trace categories 8 */ 9enum blktrace_cat { 10 BLK_TC_READ = 1 << 0, /* reads */ 11 BLK_TC_WRITE = 1 << 1, /* writes */ 12 BLK_TC_BARRIER = 1 << 2, /* barrier */ 13 BLK_TC_SYNC = 1 << 3, /* sync IO */ 14 BLK_TC_SYNCIO = BLK_TC_SYNC, 15 BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ 16 BLK_TC_REQUEUE = 1 << 5, /* requeueing */ 17 BLK_TC_ISSUE = 1 << 6, /* issue */ 18 BLK_TC_COMPLETE = 1 << 7, /* completions */ 19 BLK_TC_FS = 1 << 8, /* fs requests */ 20 BLK_TC_PC = 1 << 9, /* pc requests */ 21 BLK_TC_NOTIFY = 1 << 10, /* special message */ 22 BLK_TC_AHEAD = 1 << 11, /* readahead */ 23 BLK_TC_META = 1 << 12, /* metadata */ 24 BLK_TC_DISCARD = 1 << 13, /* discard requests */ 25 BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */ 26 27 BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ 28}; 29 30#define BLK_TC_SHIFT (16) 31#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) 32 33/* 34 * Basic trace actions 35 */ 36enum blktrace_act { 37 __BLK_TA_QUEUE = 1, /* queued */ 38 __BLK_TA_BACKMERGE, /* back merged to existing rq */ 39 __BLK_TA_FRONTMERGE, /* front merge to existing rq */ 40 __BLK_TA_GETRQ, /* allocated new request */ 41 __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ 42 __BLK_TA_REQUEUE, /* request requeued */ 43 __BLK_TA_ISSUE, /* sent to driver */ 44 __BLK_TA_COMPLETE, /* completed by driver */ 45 __BLK_TA_PLUG, /* queue was plugged */ 46 __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ 47 __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ 48 __BLK_TA_INSERT, /* insert request */ 49 __BLK_TA_SPLIT, /* bio was split */ 50 __BLK_TA_BOUNCE, /* bio was bounced */ 51 __BLK_TA_REMAP, /* bio was remapped */ 52 __BLK_TA_ABORT, /* request aborted */ 53 __BLK_TA_DRV_DATA, /* driver-specific binary data */ 54}; 55 56/* 57 * Notify events. 58 */ 59enum blktrace_notify { 60 __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ 61 __BLK_TN_TIMESTAMP, /* include system clock */ 62 __BLK_TN_MESSAGE, /* Character string message */ 63}; 64 65 66/* 67 * Trace actions in full. Additionally, read or write is masked 68 */ 69#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) 70#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 71#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 72#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 73#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 74#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) 75#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) 76#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) 77#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) 78#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) 79#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) 80#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) 81#define BLK_TA_SPLIT (__BLK_TA_SPLIT) 82#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) 83#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) 84#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) 85#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) 86 87#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) 88#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) 89#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) 90 91#define BLK_IO_TRACE_MAGIC 0x65617400 92#define BLK_IO_TRACE_VERSION 0x07 93 94/* 95 * The trace itself 96 */ 97struct blk_io_trace { 98 __u32 magic; /* MAGIC << 8 | version */ 99 __u32 sequence; /* event number */ 100 __u64 time; /* in microseconds */ 101 __u64 sector; /* disk offset */ 102 __u32 bytes; /* transfer length */ 103 __u32 action; /* what happened */ 104 __u32 pid; /* who did it */ 105 __u32 device; /* device number */ 106 __u32 cpu; /* on what cpu did it happen */ 107 __u16 error; /* completion error */ 108 __u16 pdu_len; /* length of data after this trace */ 109}; 110 111/* 112 * The remap event 113 */ 114struct blk_io_trace_remap { 115 __be32 device_from; 116 __be32 device_to; 117 __be64 sector_from; 118}; 119 120enum { 121 Blktrace_setup = 1, 122 Blktrace_running, 123 Blktrace_stopped, 124}; 125 126#define BLKTRACE_BDEV_SIZE 32 127 128/* 129 * User setup structure passed with BLKTRACESTART 130 */ 131struct blk_user_trace_setup { 132 char name[BLKTRACE_BDEV_SIZE]; /* output */ 133 __u16 act_mask; /* input */ 134 __u32 buf_size; /* input */ 135 __u32 buf_nr; /* input */ 136 __u64 start_lba; 137 __u64 end_lba; 138 __u32 pid; 139}; 140 141#endif 142