238 lines
7.3 KiB
C
238 lines
7.3 KiB
C
#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_SYNCIO = BLK_TC_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_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_from;
|
|
__be32 device_to;
|
|
__be64 sector_from;
|
|
};
|
|
|
|
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)
|
|
|
|
#include <linux/sysfs.h>
|
|
|
|
struct blk_trace {
|
|
int trace_state;
|
|
struct rchan *rchan;
|
|
unsigned long __percpu *sequence;
|
|
unsigned char __percpu *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 block_device *bdev,
|
|
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,
|
|
struct block_device *bdev,
|
|
char __user *arg);
|
|
extern int blk_trace_startstop(struct request_queue *q, int start);
|
|
extern int blk_trace_remove(struct request_queue *q);
|
|
extern void blk_trace_remove_sysfs(struct device *dev);
|
|
extern int blk_trace_init_sysfs(struct device *dev);
|
|
|
|
extern struct attribute_group blk_trace_attr_group;
|
|
|
|
#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, bdev, buts) (-ENOTTY)
|
|
# define blk_add_driver_data(q, rq, data, len) do {} while (0)
|
|
# define blk_trace_setup(q, name, dev, bdev, 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)
|
|
# define blk_trace_remove_sysfs(dev) do { } while (0)
|
|
static inline int blk_trace_init_sysfs(struct device *dev)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_IO_TRACE */
|
|
|
|
#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
|
|
|
|
static inline int blk_cmd_buf_len(struct request *rq)
|
|
{
|
|
return blk_pc_request(rq) ? rq->cmd_len * 3 : 1;
|
|
}
|
|
|
|
extern void blk_dump_cmd(char *buf, struct request *rq);
|
|
extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
|
|
extern void blk_fill_rwbs_rq(char *rwbs, struct request *rq);
|
|
|
|
#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif
|