diff options
Diffstat (limited to 'include/linux/blktrace_api.h')
| -rw-r--r-- | include/linux/blktrace_api.h | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h new file mode 100644 index 00000000..8c7c2de7 --- /dev/null +++ b/include/linux/blktrace_api.h @@ -0,0 +1,253 @@ +#ifndef BLKTRACE_H +#define BLKTRACE_H + +#include <linux/types.h> +#ifdef __KERNEL__ +#include <linux/blkdev.h> +#include <linux/relay.h> +#include <linux/compat.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 __attribute__((format(printf, 2, 3))) +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 */ + +#ifdef CONFIG_COMPAT + +struct compat_blk_user_trace_setup { + char name[32]; + u16 act_mask; + u32 buf_size; + u32 buf_nr; + compat_u64 start_lba; + compat_u64 end_lba; + u32 pid; +}; +#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup) + +#endif + +#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) + +static inline int blk_cmd_buf_len(struct request *rq) +{ + return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? 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); + +#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ + +#endif /* __KERNEL__ */ +#endif |