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      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 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,		/* binary driver 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_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  */
     95 struct 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  */
    112 struct 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  */
    121 struct 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