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_FLUSH = 1 << 2, /* flush */ 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 BLK_TC_FUA = 1 << 15, /* fua requests */ 26 27 BLK_TC_END = 1 << 15, /* we've run out of bits! */ 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 */ 36 enum { 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, /* binary driver data */ 54 }; 55 56 /* 57 * Notify events. 58 */ 59 enum 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 * Trace actions in full. Additionally, read or write is masked 67 */ 68 #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) 69 #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 70 #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 71 #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 72 #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 73 #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) 74 #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) 75 #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) 76 #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) 77 #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) 78 #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) 79 #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) 80 #define BLK_TA_SPLIT (__BLK_TA_SPLIT) 81 #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) 82 #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) 83 #define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) 84 #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) 85 86 #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) 87 #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) 88 #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) 89 90 #define BLK_IO_TRACE_MAGIC 0x65617400 91 #define BLK_IO_TRACE_VERSION 0x07 92 93 /* 94 * The trace itself 95 */ 96 struct blk_io_trace { 97 __u32 magic; /* MAGIC << 8 | version */ 98 __u32 sequence; /* event number */ 99 __u64 time; /* in nanoseconds */ 100 __u64 sector; /* disk offset */ 101 __u32 bytes; /* transfer length */ 102 __u32 action; /* what happened */ 103 __u32 pid; /* who did it */ 104 __u32 device; /* device identifier (dev_t) */ 105 __u32 cpu; /* on what cpu did it happen */ 106 __u16 error; /* completion error */ 107 __u16 pdu_len; /* length of data after this trace */ 108 }; 109 110 /* 111 * The remap event 112 */ 113 struct blk_io_trace_remap { 114 __u32 device_from; 115 __u32 device_to; 116 __u64 sector_from; 117 }; 118 119 /* 120 * User setup structure passed with BLKSTARTTRACE 121 */ 122 struct blk_user_trace_setup { 123 char name[32]; /* output */ 124 __u16 act_mask; /* input */ 125 __u32 buf_size; /* input */ 126 __u32 buf_nr; /* input */ 127 __u64 start_lba; 128 __u64 end_lba; 129 __u32 pid; 130 }; 131 132 #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) 133 #define BLKTRACESTART _IO(0x12,116) 134 #define BLKTRACESTOP _IO(0x12,117) 135 #define BLKTRACETEARDOWN _IO(0x12,118) 136 137 #endif 138