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1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2#ifndef BLKTRACE_H
3#define BLKTRACE_H
4
5#include <linux/types.h>
6
7/*
8 * Trace categories
9 */
10enum blktrace_cat {
11 BLK_TC_READ = 1 << 0, /* reads */
12 BLK_TC_WRITE = 1 << 1, /* writes */
13 BLK_TC_FLUSH = 1 << 2, /* flush */
14 BLK_TC_SYNC = 1 << 3, /* sync IO */
15 BLK_TC_SYNCIO = BLK_TC_SYNC,
16 BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
17 BLK_TC_REQUEUE = 1 << 5, /* requeueing */
18 BLK_TC_ISSUE = 1 << 6, /* issue */
19 BLK_TC_COMPLETE = 1 << 7, /* completions */
20 BLK_TC_FS = 1 << 8, /* fs requests */
21 BLK_TC_PC = 1 << 9, /* pc requests */
22 BLK_TC_NOTIFY = 1 << 10, /* special message */
23 BLK_TC_AHEAD = 1 << 11, /* readahead */
24 BLK_TC_META = 1 << 12, /* metadata */
25 BLK_TC_DISCARD = 1 << 13, /* discard requests */
26 BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */
27 BLK_TC_FUA = 1 << 15, /* fua requests */
28
29 BLK_TC_END = 1 << 15, /* we've run out of bits! */
30};
31
32#define BLK_TC_SHIFT (16)
33#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
34
35/*
36 * Basic trace actions
37 */
38enum blktrace_act {
39 __BLK_TA_QUEUE = 1, /* queued */
40 __BLK_TA_BACKMERGE, /* back merged to existing rq */
41 __BLK_TA_FRONTMERGE, /* front merge to existing rq */
42 __BLK_TA_GETRQ, /* allocated new request */
43 __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
44 __BLK_TA_REQUEUE, /* request requeued */
45 __BLK_TA_ISSUE, /* sent to driver */
46 __BLK_TA_COMPLETE, /* completed by driver */
47 __BLK_TA_PLUG, /* queue was plugged */
48 __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
49 __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
50 __BLK_TA_INSERT, /* insert request */
51 __BLK_TA_SPLIT, /* bio was split */
52 __BLK_TA_BOUNCE, /* unused, was: bio was bounced */
53 __BLK_TA_REMAP, /* bio was remapped */
54 __BLK_TA_ABORT, /* request aborted */
55 __BLK_TA_DRV_DATA, /* driver-specific binary data */
56 __BLK_TA_CGROUP = 1 << 8, /* from a cgroup*/
57};
58
59/*
60 * Notify events.
61 */
62enum 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 */
66 __BLK_TN_CGROUP = __BLK_TA_CGROUP, /* from a cgroup */
67};
68
69
70/*
71 * Trace actions in full. Additionally, read or write is masked
72 */
73#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
74#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
75#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
76#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
77#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
78#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
79#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
80#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
81#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
82#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
83#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
84#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
85#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
86#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
87#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
88#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
89#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
90
91#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
92#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
93#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
94
95#define BLK_IO_TRACE_MAGIC 0x65617400
96#define BLK_IO_TRACE_VERSION 0x07
97
98/*
99 * The trace itself
100 */
101struct blk_io_trace {
102 __u32 magic; /* MAGIC << 8 | version */
103 __u32 sequence; /* event number */
104 __u64 time; /* in nanoseconds */
105 __u64 sector; /* disk offset */
106 __u32 bytes; /* transfer length */
107 __u32 action; /* what happened */
108 __u32 pid; /* who did it */
109 __u32 device; /* device number */
110 __u32 cpu; /* on what cpu did it happen */
111 __u16 error; /* completion error */
112 __u16 pdu_len; /* length of data after this trace */
113 /* cgroup id will be stored here if exists */
114};
115
116/*
117 * The remap event
118 */
119struct blk_io_trace_remap {
120 __be32 device_from;
121 __be32 device_to;
122 __be64 sector_from;
123};
124
125enum {
126 Blktrace_setup = 1,
127 Blktrace_running,
128 Blktrace_stopped,
129};
130
131#define BLKTRACE_BDEV_SIZE 32
132
133/*
134 * User setup structure passed with BLKTRACESETUP
135 */
136struct blk_user_trace_setup {
137 char name[BLKTRACE_BDEV_SIZE]; /* output */
138 __u16 act_mask; /* input */
139 __u32 buf_size; /* input */
140 __u32 buf_nr; /* input */
141 __u64 start_lba;
142 __u64 end_lba;
143 __u32 pid;
144};
145
146#endif /* BLKTRACE_H */