4 #include <linux/types.h>
6 #include <linux/blkdev.h>
7 #include <linux/relay.h>
14 BLK_TC_READ
= 1 << 0, /* reads */
15 BLK_TC_WRITE
= 1 << 1, /* writes */
16 BLK_TC_BARRIER
= 1 << 2, /* barrier */
17 BLK_TC_SYNC
= 1 << 3, /* sync IO */
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 */
25 BLK_TC_AHEAD
= 1 << 11, /* readahead */
26 BLK_TC_META
= 1 << 12, /* metadata */
27 BLK_TC_DISCARD
= 1 << 13, /* discard requests */
28 BLK_TC_DRV_DATA
= 1 << 14, /* binary per-driver data */
30 BLK_TC_END
= 1 << 15, /* only 16-bits, reminder */
33 #define BLK_TC_SHIFT (16)
34 #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
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 */
55 __BLK_TA_ABORT
, /* request aborted */
56 __BLK_TA_DRV_DATA
, /* driver-specific binary data */
62 enum blktrace_notify
{
63 __BLK_TN_PROCESS
= 0, /* establish pid/name mapping */
64 __BLK_TN_TIMESTAMP
, /* include system clock */
65 __BLK_TN_MESSAGE
, /* Character string message */
70 * Trace actions in full. Additionally, read or write is masked
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))
87 #define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
88 #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
90 #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
91 #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
92 #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
94 #define BLK_IO_TRACE_MAGIC 0x65617400
95 #define BLK_IO_TRACE_VERSION 0x07
100 struct blk_io_trace
{
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 */
117 struct blk_io_trace_remap
{
129 #define BLKTRACE_BDEV_SIZE 32
132 * User setup structure passed with BLKTRACESTART
134 struct blk_user_trace_setup
{
135 char name
[BLKTRACE_BDEV_SIZE
]; /* output */
136 __u16 act_mask
; /* input */
137 __u32 buf_size
; /* input */
138 __u32 buf_nr
; /* input */
145 #if defined(CONFIG_BLK_DEV_IO_TRACE)
149 unsigned long *sequence
;
150 unsigned char *msg_data
;
157 struct dentry
*dropped_file
;
158 struct dentry
*msg_file
;
162 extern int blk_trace_ioctl(struct block_device
*, unsigned, char __user
*);
163 extern void blk_trace_shutdown(struct request_queue
*);
164 extern int do_blk_trace_setup(struct request_queue
*q
,
165 char *name
, dev_t dev
, struct blk_user_trace_setup
*buts
);
166 extern void __trace_note_message(struct blk_trace
*, const char *fmt
, ...);
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
175 * Records a (simple) message onto the blktrace stream.
177 * NOTE: BLK_TN_MAX_MSG characters are output at most.
178 * NOTE: Can not use 'static inline' due to presence of var args...
181 #define blk_add_trace_msg(q, fmt, ...) \
183 struct blk_trace *bt = (q)->blk_trace; \
185 __trace_note_message(bt, fmt, ##__VA_ARGS__); \
187 #define BLK_TN_MAX_MSG 128
189 extern void blk_add_driver_data(struct request_queue
*q
, struct request
*rq
,
190 void *data
, size_t len
);
191 extern int blk_trace_setup(struct request_queue
*q
, char *name
, dev_t dev
,
193 extern int blk_trace_startstop(struct request_queue
*q
, int start
);
194 extern int blk_trace_remove(struct request_queue
*q
);
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)
199 #define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY)
200 #define blk_add_driver_data(q, rq, data, len) do {} while (0)
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)
204 #define blk_add_trace_msg(q, fmt, ...) do { } while (0)
206 #endif /* CONFIG_BLK_DEV_IO_TRACE */
207 #endif /* __KERNEL__ */
This page took 0.039733 seconds and 5 git commands to generate.