209 lines
6.4 KiB
C
209 lines
6.4 KiB
C
#ifndef BLKTRACE_H
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#define BLKTRACE_H
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#include <linux/types.h>
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#ifdef __KERNEL__
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#include <linux/blkdev.h>
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#include <linux/relay.h>
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#endif
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/*
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* Trace categories
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*/
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enum blktrace_cat {
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BLK_TC_READ = 1 << 0, /* reads */
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BLK_TC_WRITE = 1 << 1, /* writes */
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BLK_TC_BARRIER = 1 << 2, /* barrier */
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BLK_TC_SYNC = 1 << 3, /* sync IO */
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BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
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BLK_TC_REQUEUE = 1 << 5, /* requeueing */
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BLK_TC_ISSUE = 1 << 6, /* issue */
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BLK_TC_COMPLETE = 1 << 7, /* completions */
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BLK_TC_FS = 1 << 8, /* fs requests */
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BLK_TC_PC = 1 << 9, /* pc requests */
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BLK_TC_NOTIFY = 1 << 10, /* special message */
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BLK_TC_AHEAD = 1 << 11, /* readahead */
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BLK_TC_META = 1 << 12, /* metadata */
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BLK_TC_DISCARD = 1 << 13, /* discard requests */
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BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */
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BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
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};
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#define BLK_TC_SHIFT (16)
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#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
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/*
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* Basic trace actions
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*/
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enum blktrace_act {
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__BLK_TA_QUEUE = 1, /* queued */
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__BLK_TA_BACKMERGE, /* back merged to existing rq */
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__BLK_TA_FRONTMERGE, /* front merge to existing rq */
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__BLK_TA_GETRQ, /* allocated new request */
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__BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
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__BLK_TA_REQUEUE, /* request requeued */
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__BLK_TA_ISSUE, /* sent to driver */
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__BLK_TA_COMPLETE, /* completed by driver */
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__BLK_TA_PLUG, /* queue was plugged */
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__BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
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__BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
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__BLK_TA_INSERT, /* insert request */
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__BLK_TA_SPLIT, /* bio was split */
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__BLK_TA_BOUNCE, /* bio was bounced */
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__BLK_TA_REMAP, /* bio was remapped */
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__BLK_TA_ABORT, /* request aborted */
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__BLK_TA_DRV_DATA, /* driver-specific binary data */
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};
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/*
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* Notify events.
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*/
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enum blktrace_notify {
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__BLK_TN_PROCESS = 0, /* establish pid/name mapping */
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__BLK_TN_TIMESTAMP, /* include system clock */
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__BLK_TN_MESSAGE, /* Character string message */
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};
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/*
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* Trace actions in full. Additionally, read or write is masked
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*/
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#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
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#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
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#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
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#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
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#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
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#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
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#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
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#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
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#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
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#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
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#define BLK_IO_TRACE_MAGIC 0x65617400
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#define BLK_IO_TRACE_VERSION 0x07
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/*
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* The trace itself
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*/
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struct blk_io_trace {
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__u32 magic; /* MAGIC << 8 | version */
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__u32 sequence; /* event number */
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__u64 time; /* in microseconds */
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__u64 sector; /* disk offset */
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__u32 bytes; /* transfer length */
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__u32 action; /* what happened */
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__u32 pid; /* who did it */
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__u32 device; /* device number */
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__u32 cpu; /* on what cpu did it happen */
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__u16 error; /* completion error */
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__u16 pdu_len; /* length of data after this trace */
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};
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/*
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* The remap event
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*/
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struct blk_io_trace_remap {
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__be32 device;
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__be32 device_from;
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__be64 sector;
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};
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enum {
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Blktrace_setup = 1,
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Blktrace_running,
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Blktrace_stopped,
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};
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#define BLKTRACE_BDEV_SIZE 32
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/*
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* User setup structure passed with BLKTRACESTART
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*/
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struct blk_user_trace_setup {
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char name[BLKTRACE_BDEV_SIZE]; /* output */
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__u16 act_mask; /* input */
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__u32 buf_size; /* input */
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__u32 buf_nr; /* input */
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__u64 start_lba;
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__u64 end_lba;
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__u32 pid;
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};
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#ifdef __KERNEL__
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#if defined(CONFIG_BLK_DEV_IO_TRACE)
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struct blk_trace {
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int trace_state;
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struct rchan *rchan;
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unsigned long *sequence;
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unsigned char *msg_data;
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u16 act_mask;
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u64 start_lba;
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u64 end_lba;
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u32 pid;
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u32 dev;
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struct dentry *dir;
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struct dentry *dropped_file;
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struct dentry *msg_file;
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atomic_t dropped;
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};
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extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
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extern void blk_trace_shutdown(struct request_queue *);
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extern int do_blk_trace_setup(struct request_queue *q,
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char *name, dev_t dev, struct blk_user_trace_setup *buts);
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extern void __trace_note_message(struct blk_trace *, const char *fmt, ...);
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/**
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* blk_add_trace_msg - Add a (simple) message to the blktrace stream
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* @q: queue the io is for
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* @fmt: format to print message in
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* args... Variable argument list for format
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*
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* Description:
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* Records a (simple) message onto the blktrace stream.
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*
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* NOTE: BLK_TN_MAX_MSG characters are output at most.
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* NOTE: Can not use 'static inline' due to presence of var args...
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*
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**/
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#define blk_add_trace_msg(q, fmt, ...) \
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do { \
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struct blk_trace *bt = (q)->blk_trace; \
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if (unlikely(bt)) \
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__trace_note_message(bt, fmt, ##__VA_ARGS__); \
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} while (0)
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#define BLK_TN_MAX_MSG 128
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extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
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void *data, size_t len);
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extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
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char __user *arg);
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extern int blk_trace_startstop(struct request_queue *q, int start);
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extern int blk_trace_remove(struct request_queue *q);
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#else /* !CONFIG_BLK_DEV_IO_TRACE */
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#define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
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#define blk_trace_shutdown(q) do { } while (0)
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#define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY)
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#define blk_add_driver_data(q, rq, data, len) do {} while (0)
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#define blk_trace_setup(q, name, dev, arg) (-ENOTTY)
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#define blk_trace_startstop(q, start) (-ENOTTY)
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#define blk_trace_remove(q) (-ENOTTY)
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#define blk_add_trace_msg(q, fmt, ...) do { } while (0)
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#endif /* CONFIG_BLK_DEV_IO_TRACE */
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#endif /* __KERNEL__ */
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#endif
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