[net-next-2.6.git] / include / linux / blktrace_api.h

#ifndef BLKTRACE_H
#define BLKTRACE_H

#include <linux/types.h>
#ifdef __KERNEL__
#include <linux/blkdev.h>
#include <linux/relay.h>
#endif

/*
 * Trace categories
 */
enum blktrace_cat {
	BLK_TC_READ	= 1 << 0,	/* reads */
	BLK_TC_WRITE	= 1 << 1,	/* writes */
	BLK_TC_BARRIER	= 1 << 2,	/* barrier */
	BLK_TC_SYNC	= 1 << 3,	/* sync IO */
	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_DISCARD	= 1 << 13,	/* discard requests */
	BLK_TC_DRV_DATA	= 1 << 14,	/* binary per-driver data */

	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 blktrace_act {
	__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 */
	__BLK_TA_ABORT,			/* request aborted */
	__BLK_TA_DRV_DATA,		/* driver-specific binary data */
};

/*
 * Notify events.
 */
enum blktrace_notify {
	__BLK_TN_PROCESS = 0,		/* establish pid/name mapping */
	__BLK_TN_TIMESTAMP,		/* include system clock */
	__BLK_TN_MESSAGE,		/* Character string message */
};


/*
 * 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_TA_ABORT		(__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
#define BLK_TA_DRV_DATA	(__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))

#define BLK_TN_PROCESS		(__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_TIMESTAMP	(__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
#define BLK_TN_MESSAGE		(__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))

#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 microseconds */
	__u64 sector;		/* disk offset */
	__u32 bytes;		/* transfer length */
	__u32 action;		/* what happened */
	__u32 pid;		/* who did it */
	__u32 device;		/* device number */
	__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 {
	__be32 device;
	__be32 device_from;
	__be64 sector;
};

enum {
	Blktrace_setup = 1,
	Blktrace_running,
	Blktrace_stopped,
};

#define BLKTRACE_BDEV_SIZE	32

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

#ifdef __KERNEL__
#if defined(CONFIG_BLK_DEV_IO_TRACE)
struct blk_trace {
	int trace_state;
	struct rchan *rchan;
	unsigned long *sequence;
	unsigned char *msg_data;
	u16 act_mask;
	u64 start_lba;
	u64 end_lba;
	u32 pid;
	u32 dev;
	struct dentry *dir;
	struct dentry *dropped_file;
	struct dentry *msg_file;
	atomic_t dropped;
};

extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
extern void blk_trace_shutdown(struct request_queue *);
extern int do_blk_trace_setup(struct request_queue *q,
	char *name, dev_t dev, struct blk_user_trace_setup *buts);
extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);

/**
 * blk_add_trace_msg - Add a (simple) message to the blktrace stream
 * @q:		queue the io is for
 * @fmt:	format to print message in
 * args...	Variable argument list for format
 *
 * Description:
 *     Records a (simple) message onto the blktrace stream.
 *
 *     NOTE: BLK_TN_MAX_MSG characters are output at most.
 *     NOTE: Can not use 'static inline' due to presence of var args...
 *
 **/
#define blk_add_trace_msg(q, fmt, ...)					\
	do {								\
		struct blk_trace *bt = (q)->blk_trace;			\
		if (unlikely(bt))					\
			__trace_note_message(bt, fmt, ##__VA_ARGS__);	\
	} while (0)
#define BLK_TN_MAX_MSG		128

extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
				void *data, size_t len);
extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
			   char __user *arg);
extern int blk_trace_startstop(struct request_queue *q, int start);
extern int blk_trace_remove(struct request_queue *q);

#else /* !CONFIG_BLK_DEV_IO_TRACE */
#define blk_trace_ioctl(bdev, cmd, arg)		(-ENOTTY)
#define blk_trace_shutdown(q)			do { } while (0)
#define do_blk_trace_setup(q, name, dev, buts)	(-ENOTTY)
#define blk_add_driver_data(q, rq, data, len)	do {} while (0)
#define blk_trace_setup(q, name, dev, arg)	(-ENOTTY)
#define blk_trace_startstop(q, start)		(-ENOTTY)
#define blk_trace_remove(q)			(-ENOTTY)
#define blk_add_trace_msg(q, fmt, ...)		do { } while (0)

#endif /* CONFIG_BLK_DEV_IO_TRACE */
#endif /* __KERNEL__ */
#endif
Commit	Line	Data
2056a782 JA	1	#ifndef BLKTRACE_H
	2	#define BLKTRACE_H
	3
4502b80e	4	#include <linux/types.h>
c0ddffa8	5	#ifdef __KERNEL__
2056a782 JA	6	#include <linux/blkdev.h>
2056a782 JA	7	#include <linux/relay.h>
c0ddffa8	8	#endif
2056a782 JA	9
	10	/*
	11	* Trace categories
	12	*/
	13	enum blktrace_cat {
	14	BLK_TC_READ = 1 << 0, /* reads */
	15	BLK_TC_WRITE = 1 << 1, /* writes */
	16	BLK_TC_BARRIER = 1 << 2, /* barrier */
fc0a75ce	17	BLK_TC_SYNC = 1 << 3, /* sync IO */
2056a782 JA	18	BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
	19	BLK_TC_REQUEUE = 1 << 5, /* requeueing */
	20	BLK_TC_ISSUE = 1 << 6, /* issue */
	21	BLK_TC_COMPLETE = 1 << 7, /* completions */
	22	BLK_TC_FS = 1 << 8, /* fs requests */
	23	BLK_TC_PC = 1 << 9, /* pc requests */
	24	BLK_TC_NOTIFY = 1 << 10, /* special message */
40359ccb	25	BLK_TC_AHEAD = 1 << 11, /* readahead */
7457e6e2	26	BLK_TC_META = 1 << 12, /* metadata */
27b29e86	27	BLK_TC_DISCARD = 1 << 13, /* discard requests */
756f8243	28	BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */
2056a782 JA	29
	30	BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
	31	};
	32
	33	#define BLK_TC_SHIFT (16)
	34	#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
	35
	36	/*
	37	* Basic trace actions
	38	*/
	39	enum blktrace_act {
	40	__BLK_TA_QUEUE = 1, /* queued */
	41	__BLK_TA_BACKMERGE, /* back merged to existing rq */
	42	__BLK_TA_FRONTMERGE, /* front merge to existing rq */
	43	__BLK_TA_GETRQ, /* allocated new request */
	44	__BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
	45	__BLK_TA_REQUEUE, /* request requeued */
	46	__BLK_TA_ISSUE, /* sent to driver */
	47	__BLK_TA_COMPLETE, /* completed by driver */
	48	__BLK_TA_PLUG, /* queue was plugged */
	49	__BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
	50	__BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
	51	__BLK_TA_INSERT, /* insert request */
	52	__BLK_TA_SPLIT, /* bio was split */
	53	__BLK_TA_BOUNCE, /* bio was bounced */
	54	__BLK_TA_REMAP, /* bio was remapped */
11914a53	55	__BLK_TA_ABORT, /* request aborted */
756f8243	56	__BLK_TA_DRV_DATA, /* driver-specific binary data */
2056a782 JA	57	};
2056a782 JA	58
be1c6341 OK	59	/*
	60	* Notify events.
	61	*/
	62	enum blktrace_notify {
	63	__BLK_TN_PROCESS = 0, /* establish pid/name mapping */
	64	__BLK_TN_TIMESTAMP, /* include system clock */
9d5f09a4	65	__BLK_TN_MESSAGE, /* Character string message */
be1c6341 OK	66	};
	67
	68
2056a782 JA	69	/*
	70	* Trace actions in full. Additionally, read or write is masked
	71	*/
	72	#define BLK_TA_QUEUE (__BLK_TA_QUEUE \| BLK_TC_ACT(BLK_TC_QUEUE))
	73	#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE \| BLK_TC_ACT(BLK_TC_QUEUE))
	74	#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE \| BLK_TC_ACT(BLK_TC_QUEUE))
	75	#define BLK_TA_GETRQ (__BLK_TA_GETRQ \| BLK_TC_ACT(BLK_TC_QUEUE))
	76	#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ \| BLK_TC_ACT(BLK_TC_QUEUE))
	77	#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE \| BLK_TC_ACT(BLK_TC_REQUEUE))
	78	#define BLK_TA_ISSUE (__BLK_TA_ISSUE \| BLK_TC_ACT(BLK_TC_ISSUE))
	79	#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE\| BLK_TC_ACT(BLK_TC_COMPLETE))
	80	#define BLK_TA_PLUG (__BLK_TA_PLUG \| BLK_TC_ACT(BLK_TC_QUEUE))
	81	#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO \| BLK_TC_ACT(BLK_TC_QUEUE))
	82	#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER \| BLK_TC_ACT(BLK_TC_QUEUE))
	83	#define BLK_TA_INSERT (__BLK_TA_INSERT \| BLK_TC_ACT(BLK_TC_QUEUE))
	84	#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
	85	#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
	86	#define BLK_TA_REMAP (__BLK_TA_REMAP \| BLK_TC_ACT(BLK_TC_QUEUE))
11914a53	87	#define BLK_TA_ABORT (__BLK_TA_ABORT \| BLK_TC_ACT(BLK_TC_QUEUE))
756f8243	88	#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA \| BLK_TC_ACT(BLK_TC_DRV_DATA))
2056a782	89
be1c6341 OK	90	#define BLK_TN_PROCESS (__BLK_TN_PROCESS \| BLK_TC_ACT(BLK_TC_NOTIFY))
be1c6341 OK	91	#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP \| BLK_TC_ACT(BLK_TC_NOTIFY))
9d5f09a4	92	#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE \| BLK_TC_ACT(BLK_TC_NOTIFY))
be1c6341	93
2056a782 JA	94	#define BLK_IO_TRACE_MAGIC 0x65617400
	95	#define BLK_IO_TRACE_VERSION 0x07
	96
	97	/*
	98	* The trace itself
	99	*/
	100	struct blk_io_trace {
c0ddffa8 SS	101	__u32 magic; /* MAGIC << 8 \| version */
	102	__u32 sequence; /* event number */
	103	__u64 time; /* in microseconds */
	104	__u64 sector; /* disk offset */
	105	__u32 bytes; /* transfer length */
	106	__u32 action; /* what happened */
	107	__u32 pid; /* who did it */
	108	__u32 device; /* device number */
	109	__u32 cpu; /* on what cpu did it happen */
	110	__u16 error; /* completion error */
	111	__u16 pdu_len; /* length of data after this trace */
2056a782 JA	112	};
	113
	114	/*
	115	* The remap event
	116	*/
	117	struct blk_io_trace_remap {
fda151d9	118	__be32 device;
c7149d6b	119	__be32 device_from;
fda151d9	120	__be64 sector;
2056a782 JA	121	};
	122
	123	enum {
	124	Blktrace_setup = 1,
	125	Blktrace_running,
	126	Blktrace_stopped,
	127	};
	128
0497b345 JA	129	#define BLKTRACE_BDEV_SIZE 32
0497b345 JA	130
c0ddffa8 SS	131	/*
	132	* User setup structure passed with BLKTRACESTART
	133	*/
	134	struct blk_user_trace_setup {
0497b345	135	char name[BLKTRACE_BDEV_SIZE]; /* output */
c0ddffa8 SS	136	__u16 act_mask; /* input */
	137	__u32 buf_size; /* input */
	138	__u32 buf_nr; /* input */
	139	__u64 start_lba;
	140	__u64 end_lba;
	141	__u32 pid;
	142	};
	143
	144	#ifdef __KERNEL__
	145	#if defined(CONFIG_BLK_DEV_IO_TRACE)
2056a782 JA	146	struct blk_trace {
	147	int trace_state;
	148	struct rchan *rchan;
	149	unsigned long *sequence;
64565911	150	unsigned char *msg_data;
2056a782 JA	151	u16 act_mask;
	152	u64 start_lba;
	153	u64 end_lba;
	154	u32 pid;
	155	u32 dev;
	156	struct dentry *dir;
	157	struct dentry *dropped_file;
02c62304	158	struct dentry *msg_file;
2056a782 JA	159	atomic_t dropped;
	160	};
	161
2056a782	162	extern int blk_trace_ioctl(struct block_device , unsigned, char __user );
165125e1	163	extern void blk_trace_shutdown(struct request_queue *);
171044d4	164	extern int do_blk_trace_setup(struct request_queue *q,
6da127ad	165	char name, dev_t dev, struct blk_user_trace_setup buts);
9d5f09a4	166	extern void __trace_note_message(struct blk_trace , const char fmt, ...);
171044d4	167
9d5f09a4 AB	168	/**
	169	* blk_add_trace_msg - Add a (simple) message to the blktrace stream
	170	* @q: queue the io is for
	171	* @fmt: format to print message in
	172	* args... Variable argument list for format
	173	*
	174	* Description:
	175	* Records a (simple) message onto the blktrace stream.
	176	*
	177	* NOTE: BLK_TN_MAX_MSG characters are output at most.
	178	* NOTE: Can not use 'static inline' due to presence of var args...
	179	*
	180	**/
	181	#define blk_add_trace_msg(q, fmt, ...) \
	182	do { \
	183	struct blk_trace *bt = (q)->blk_trace; \
	184	if (unlikely(bt)) \
	185	__trace_note_message(bt, fmt, ##__VA_ARGS__); \
	186	} while (0)
64565911	187	#define BLK_TN_MAX_MSG 128
2056a782	188
5f3ea37c ACM	189	extern void blk_add_driver_data(struct request_queue q, struct request rq,
5f3ea37c ACM	190	void *data, size_t len);
7da975a2	191	extern int blk_trace_setup(struct request_queue q, char name, dev_t dev,
6da127ad	192	char __user *arg);
7da975a2 MP	193	extern int blk_trace_startstop(struct request_queue *q, int start);
7da975a2 MP	194	extern int blk_trace_remove(struct request_queue *q);
6da127ad	195
2056a782 JA	196	#else /* !CONFIG_BLK_DEV_IO_TRACE */
	197	#define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
	198	#define blk_trace_shutdown(q) do { } while (0)
6da127ad	199	#define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY)
5f3ea37c	200	#define blk_add_driver_data(q, rq, data, len) do {} while (0)
6da127ad CS	201	#define blk_trace_setup(q, name, dev, arg) (-ENOTTY)
	202	#define blk_trace_startstop(q, start) (-ENOTTY)
	203	#define blk_trace_remove(q) (-ENOTTY)
9d5f09a4 AB	204	#define blk_add_trace_msg(q, fmt, ...) do { } while (0)
9d5f09a4 AB	205
2056a782	206	#endif /* CONFIG_BLK_DEV_IO_TRACE */
171044d4	207	#endif /* __KERNEL__ */
2056a782	208	#endif