1#ifndef BLKTRACEAPI_H 2#define BLKTRACEAPI_H 3 4#include <asm/types.h> 5 6/* 7 * Trace categories 8 */ 9enum { 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 */ 14 BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ 15 BLK_TC_REQUEUE = 1 << 5, /* requeueing */ 16 BLK_TC_ISSUE = 1 << 6, /* issue */ 17 BLK_TC_COMPLETE = 1 << 7, /* completions */ 18 BLK_TC_FS = 1 << 8, /* fs requests */ 19 BLK_TC_PC = 1 << 9, /* pc requests */ 20 BLK_TC_NOTIFY = 1 << 10, /* special message */ 21 BLK_TC_AHEAD = 1 << 11, /* readahead */ 22 BLK_TC_META = 1 << 12, /* metadata */ 23 BLK_TC_DISCARD = 1 << 13, /* discard requests */ 24 BLK_TC_DRV_DATA = 1 << 14, /* binary driver data */ 25 26 BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ 27}; 28 29#define BLK_TC_SHIFT (16) 30#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) 31 32/* 33 * Basic trace actions 34 */ 35enum { 36 __BLK_TA_QUEUE = 1, /* queued */ 37 __BLK_TA_BACKMERGE, /* back merged to existing rq */ 38 __BLK_TA_FRONTMERGE, /* front merge to existing rq */ 39 __BLK_TA_GETRQ, /* allocated new request */ 40 __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ 41 __BLK_TA_REQUEUE, /* request requeued */ 42 __BLK_TA_ISSUE, /* sent to driver */ 43 __BLK_TA_COMPLETE, /* completed by driver */ 44 __BLK_TA_PLUG, /* queue was plugged */ 45 __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ 46 __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ 47 __BLK_TA_INSERT, /* insert request */ 48 __BLK_TA_SPLIT, /* bio was split */ 49 __BLK_TA_BOUNCE, /* bio was bounced */ 50 __BLK_TA_REMAP, /* bio was remapped */ 51 __BLK_TA_ABORT, /* request aborted */ 52 __BLK_TA_DRV_DATA, /* binary driver data */ 53}; 54 55/* 56 * Notify events. 57 */ 58enum blktrace_notify { 59 __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ 60 __BLK_TN_TIMESTAMP, /* include system clock */ 61 __BLK_TN_MESSAGE, /* Character string message */ 62}; 63 64/* 65 * Trace actions in full. Additionally, read or write is masked 66 */ 67#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) 68#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 69#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 70#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 71#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 72#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) 73#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) 74#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) 75#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) 76#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) 77#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) 78#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) 79#define BLK_TA_SPLIT (__BLK_TA_SPLIT) 80#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) 81#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) 82#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) 83#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) 84 85#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) 86#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) 87#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) 88 89#define BLK_IO_TRACE_MAGIC 0x65617400 90#define BLK_IO_TRACE_VERSION 0x07 91 92/* 93 * The trace itself 94 */ 95struct blk_io_trace { 96 __u32 magic; /* MAGIC << 8 | version */ 97 __u32 sequence; /* event number */ 98 __u64 time; /* in nanoseconds */ 99 __u64 sector; /* disk offset */ 100 __u32 bytes; /* transfer length */ 101 __u32 action; /* what happened */ 102 __u32 pid; /* who did it */ 103 __u32 device; /* device identifier (dev_t) */ 104 __u32 cpu; /* on what cpu did it happen */ 105 __u16 error; /* completion error */ 106 __u16 pdu_len; /* length of data after this trace */ 107}; 108 109/* 110 * The remap event 111 */ 112struct blk_io_trace_remap { 113 __u32 device_from; 114 __u32 device_to; 115 __u64 sector_from; 116}; 117 118/* 119 * User setup structure passed with BLKSTARTTRACE 120 */ 121struct blk_user_trace_setup { 122 char name[32]; /* output */ 123 __u16 act_mask; /* input */ 124 __u32 buf_size; /* input */ 125 __u32 buf_nr; /* input */ 126 __u64 start_lba; 127 __u64 end_lba; 128 __u32 pid; 129}; 130 131#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 132#define BLKTRACESTART _IO(0x12,116) 133#define BLKTRACESTOP _IO(0x12,117) 134#define BLKTRACETEARDOWN _IO(0x12,118) 135 136#endif 137