1 #ifndef BLKTRACEAPI_H 2 #define BLKTRACEAPI_H 3 4 #include <asm/types.h> 5 6 /* 7 * Trace categories 8 */ 9 enum { 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 per-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 */ 35 enum { 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, /* driver-specific binary data */ 53 }; 54 55 /* 56 * Notify events. 57 */ 58 enum 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_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) 83 84 #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) 85 #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) 86 #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) 87 88 #define BLK_IO_TRACE_MAGIC 0x65617400 89 #define BLK_IO_TRACE_VERSION 0x07 90 91 /* 92 * The trace itself 93 */ 94 struct blk_io_trace { 95 __u32 magic; /* MAGIC << 8 | version */ 96 __u32 sequence; /* event number */ 97 __u64 time; /* in nanoseconds */ 98 __u64 sector; /* disk offset */ 99 __u32 bytes; /* transfer length */ 100 __u32 action; /* what happened */ 101 __u32 pid; /* who did it */ 102 __u32 device; /* device identifier (dev_t) */ 103 __u32 cpu; /* on what cpu did it happen */ 104 __u16 error; /* completion error */ 105 __u16 pdu_len; /* length of data after this trace */ 106 }; 107 108 /* 109 * The remap event 110 */ 111 struct blk_io_trace_remap { 112 __u32 device; 113 __u32 device_from; 114 __u64 sector; 115 }; 116 117 /* 118 * User setup structure passed with BLKSTARTTRACE 119 */ 120 struct blk_user_trace_setup { 121 char name[32]; /* output */ 122 __u16 act_mask; /* input */ 123 __u32 buf_size; /* input */ 124 __u32 buf_nr; /* input */ 125 __u64 start_lba; 126 __u64 end_lba; 127 __u32 pid; 128 }; 129 130 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 131 #define BLKTRACESTART _IO(0x12,116) 132 #define BLKTRACESTOP _IO(0x12,117) 133 #define BLKTRACETEARDOWN _IO(0x12,118) 134 135 #endif 136
