[blktrace.git] / blktrace_api.h

#ifndef BLKTRACEAPI_H
#define BLKTRACEAPI_H

#include <asm/types.h>

/*
 * Trace categories
 */
enum {
	BLK_TC_READ	= 1 << 0,	/* reads */
	BLK_TC_WRITE	= 1 << 1,	/* writes */
	BLK_TC_BARRIER	= 1 << 2,	/* barrier */
	BLK_TC_SYNC	= 1 << 3,	/* sync */
	BLK_TC_QUEUE	= 1 << 4,	/* queueing/merging */
	BLK_TC_REQUEUE	= 1 << 5,	/* requeueing */
	BLK_TC_ISSUE	= 1 << 6,	/* issue */
	BLK_TC_COMPLETE	= 1 << 7,	/* completions */
	BLK_TC_FS	= 1 << 8,	/* fs requests */
	BLK_TC_PC	= 1 << 9,	/* pc requests */
	BLK_TC_NOTIFY	= 1 << 10,	/* special message */
	BLK_TC_AHEAD	= 1 << 11,	/* readahead */
	BLK_TC_META	= 1 << 12,	/* metadata */

	BLK_TC_END	= 1 << 15,	/* only 16-bits, reminder */
};

#define BLK_TC_SHIFT		(16)
#define BLK_TC_ACT(act)		((act) << BLK_TC_SHIFT)

/*
 * Basic trace actions
 */
enum {
	__BLK_TA_QUEUE = 1,		/* queued */
	__BLK_TA_BACKMERGE,		/* back merged to existing rq */
	__BLK_TA_FRONTMERGE,		/* front merge to existing rq */
	__BLK_TA_GETRQ,			/* allocated new request */
	__BLK_TA_SLEEPRQ,		/* sleeping on rq allocation */
	__BLK_TA_REQUEUE,		/* request requeued */
	__BLK_TA_ISSUE,			/* sent to driver */
	__BLK_TA_COMPLETE,		/* completed by driver */
	__BLK_TA_PLUG,			/* queue was plugged */
	__BLK_TA_UNPLUG_IO,		/* queue was unplugged by io */
	__BLK_TA_UNPLUG_TIMER,		/* queue was unplugged by timer */
	__BLK_TA_INSERT,		/* insert request */
	__BLK_TA_SPLIT,			/* bio was split */
	__BLK_TA_BOUNCE,		/* bio was bounced */
	__BLK_TA_REMAP,			/* bio was remapped */
};

/*
 * Trace actions in full. Additionally, read or write is masked
 */
#define BLK_TA_QUEUE		(__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_BACKMERGE	(__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_FRONTMERGE	(__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
#define	BLK_TA_GETRQ		(__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
#define	BLK_TA_SLEEPRQ		(__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
#define	BLK_TA_REQUEUE		(__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
#define BLK_TA_ISSUE		(__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
#define BLK_TA_COMPLETE		(__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
#define BLK_TA_PLUG		(__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_UNPLUG_IO	(__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_UNPLUG_TIMER	(__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_INSERT		(__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_SPLIT		(__BLK_TA_SPLIT)
#define BLK_TA_BOUNCE		(__BLK_TA_BOUNCE)
#define BLK_TA_REMAP		(__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))

#define BLK_IO_TRACE_MAGIC	0x65617400
#define BLK_IO_TRACE_VERSION	0x07

/*
 * The trace itself
 */
struct blk_io_trace {
	__u32 magic;		/* MAGIC << 8 | version */
	__u32 sequence;		/* event number */
	__u64 time;		/* in nanoseconds */
	__u64 sector;		/* disk offset */
	__u32 bytes;		/* transfer length */
	__u32 action;		/* what happened */
	__u32 pid;		/* who did it */
	__u32 device;		/* device identifier (dev_t) */
	__u32 cpu;		/* on what cpu did it happen */
	__u16 error;		/* completion error */
	__u16 pdu_len;		/* length of data after this trace */
};

/*
 * The remap event
 */
struct blk_io_trace_remap {
	__u32 device;
	__u32 __pad;
	__u64 sector;
};

/*
 * User setup structure passed with BLKSTARTTRACE
 */
struct blk_user_trace_setup {
	char name[32];			/* output */
	__u16 act_mask;			/* input */
	__u32 buf_size;			/* input */
	__u32 buf_nr;			/* input */
	__u64 start_lba;
	__u64 end_lba;
	__u32 pid;
};

#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
#define BLKTRACESTART _IO(0x12,116)
#define BLKTRACESTOP _IO(0x12,117)
#define BLKTRACETEARDOWN _IO(0x12,118)

#endif
Commit	Line	Data
6fe4709e JA	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 */
f86990ed	13	BLK_TC_SYNC = 1 << 3, /* sync */
6fe4709e JA	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 */
bfc70ad5	20	BLK_TC_NOTIFY = 1 << 10, /* special message */
f86990ed	21	BLK_TC_AHEAD = 1 << 11, /* readahead */
711e4d25	22	BLK_TC_META = 1 << 12, /* metadata */
6fe4709e JA	23
	24	BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
	25	};
	26
	27	#define BLK_TC_SHIFT (16)
	28	#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
	29
	30	/*
	31	* Basic trace actions
	32	*/
	33	enum {
	34	__BLK_TA_QUEUE = 1, /* queued */
	35	__BLK_TA_BACKMERGE, /* back merged to existing rq */
	36	__BLK_TA_FRONTMERGE, /* front merge to existing rq */
	37	__BLK_TA_GETRQ, /* allocated new request */
	38	__BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
	39	__BLK_TA_REQUEUE, /* request requeued */
	40	__BLK_TA_ISSUE, /* sent to driver */
	41	__BLK_TA_COMPLETE, /* completed by driver */
88b1a526	42	__BLK_TA_PLUG, /* queue was plugged */
3639a11e JA	43	__BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
3639a11e JA	44	__BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
b6076a9b	45	__BLK_TA_INSERT, /* insert request */
93f1c611 JA	46	__BLK_TA_SPLIT, /* bio was split */
93f1c611 JA	47	__BLK_TA_BOUNCE, /* bio was bounced */
a8f30e64	48	__BLK_TA_REMAP, /* bio was remapped */
6fe4709e JA	49	};
	50
	51	/*
	52	* Trace actions in full. Additionally, read or write is masked
	53	*/
	54	#define BLK_TA_QUEUE (__BLK_TA_QUEUE \| BLK_TC_ACT(BLK_TC_QUEUE))
	55	#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE \| BLK_TC_ACT(BLK_TC_QUEUE))
	56	#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE \| BLK_TC_ACT(BLK_TC_QUEUE))
	57	#define BLK_TA_GETRQ (__BLK_TA_GETRQ \| BLK_TC_ACT(BLK_TC_QUEUE))
	58	#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ \| BLK_TC_ACT(BLK_TC_QUEUE))
	59	#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE \| BLK_TC_ACT(BLK_TC_REQUEUE))
	60	#define BLK_TA_ISSUE (__BLK_TA_ISSUE \| BLK_TC_ACT(BLK_TC_ISSUE))
	61	#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE\| BLK_TC_ACT(BLK_TC_COMPLETE))
88b1a526	62	#define BLK_TA_PLUG (__BLK_TA_PLUG \| BLK_TC_ACT(BLK_TC_QUEUE))
3639a11e JA	63	#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO \| BLK_TC_ACT(BLK_TC_QUEUE))
3639a11e JA	64	#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER \| BLK_TC_ACT(BLK_TC_QUEUE))
b6076a9b	65	#define BLK_TA_INSERT (__BLK_TA_INSERT \| BLK_TC_ACT(BLK_TC_QUEUE))
93f1c611 JA	66	#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
93f1c611 JA	67	#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
a8f30e64	68	#define BLK_TA_REMAP (__BLK_TA_REMAP \| BLK_TC_ACT(BLK_TC_QUEUE))
6fe4709e JA	69
6fe4709e JA	70	#define BLK_IO_TRACE_MAGIC 0x65617400
bfc70ad5	71	#define BLK_IO_TRACE_VERSION 0x07
6fe4709e JA	72
	73	/*
	74	* The trace itself
	75	*/
	76	struct blk_io_trace {
	77	__u32 magic; /* MAGIC << 8 \| version */
	78	__u32 sequence; /* event number */
f8fd8985	79	__u64 time; /* in nanoseconds */
6fe4709e JA	80	__u64 sector; /* disk offset */
	81	__u32 bytes; /* transfer length */
	82	__u32 action; /* what happened */
	83	__u32 pid; /* who did it */
bfc70ad5	84	__u32 device; /* device identifier (dev_t) */
654aaa52	85	__u32 cpu; /* on what cpu did it happen */
6fe4709e JA	86	__u16 error; /* completion error */
	87	__u16 pdu_len; /* length of data after this trace */
	88	};
	89
a8f30e64 JA	90	/*
	91	* The remap event
	92	*/
	93	struct blk_io_trace_remap {
	94	__u32 device;
04faffa6	95	__u32 __pad;
a8f30e64 JA	96	__u64 sector;
	97	};
	98
6fe4709e JA	99	/*
	100	* User setup structure passed with BLKSTARTTRACE
	101	*/
	102	struct blk_user_trace_setup {
	103	char name[32]; /* output */
	104	__u16 act_mask; /* input */
	105	__u32 buf_size; /* input */
	106	__u32 buf_nr; /* input */
6c8d81e4 JA	107	__u64 start_lba;
	108	__u64 end_lba;
	109	__u32 pid;
6fe4709e JA	110	};
6fe4709e JA	111
ed71a31e JA	112	#define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup)
	113	#define BLKTRACESTART _IO(0x12,116)
	114	#define BLKTRACESTOP _IO(0x12,117)
	115	#define BLKTRACETEARDOWN _IO(0x12,118)
6fe4709e JA	116
6fe4709e JA	117	#endif