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1 | #ifndef BLKTRACE_H | |
2 | #define BLKTRACE_H | |
3 | ||
4 | #include <linux/types.h> | |
5 | #ifdef __KERNEL__ | |
6 | #include <linux/blkdev.h> | |
7 | #include <linux/relay.h> | |
8 | #endif | |
9 | ||
10 | /* | |
11 | * Trace categories | |
12 | */ | |
13 | enum blktrace_cat { | |
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_SYNCIO = BLK_TC_SYNC, | |
19 | BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ | |
20 | BLK_TC_REQUEUE = 1 << 5, /* requeueing */ | |
21 | BLK_TC_ISSUE = 1 << 6, /* issue */ | |
22 | BLK_TC_COMPLETE = 1 << 7, /* completions */ | |
23 | BLK_TC_FS = 1 << 8, /* fs requests */ | |
24 | BLK_TC_PC = 1 << 9, /* pc requests */ | |
25 | BLK_TC_NOTIFY = 1 << 10, /* special message */ | |
26 | BLK_TC_AHEAD = 1 << 11, /* readahead */ | |
27 | BLK_TC_META = 1 << 12, /* metadata */ | |
28 | BLK_TC_DISCARD = 1 << 13, /* discard requests */ | |
29 | BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */ | |
30 | ||
31 | BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ | |
32 | }; | |
33 | ||
34 | #define BLK_TC_SHIFT (16) | |
35 | #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) | |
36 | ||
37 | /* | |
38 | * Basic trace actions | |
39 | */ | |
40 | enum blktrace_act { | |
41 | __BLK_TA_QUEUE = 1, /* queued */ | |
42 | __BLK_TA_BACKMERGE, /* back merged to existing rq */ | |
43 | __BLK_TA_FRONTMERGE, /* front merge to existing rq */ | |
44 | __BLK_TA_GETRQ, /* allocated new request */ | |
45 | __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ | |
46 | __BLK_TA_REQUEUE, /* request requeued */ | |
47 | __BLK_TA_ISSUE, /* sent to driver */ | |
48 | __BLK_TA_COMPLETE, /* completed by driver */ | |
49 | __BLK_TA_PLUG, /* queue was plugged */ | |
50 | __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ | |
51 | __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ | |
52 | __BLK_TA_INSERT, /* insert request */ | |
53 | __BLK_TA_SPLIT, /* bio was split */ | |
54 | __BLK_TA_BOUNCE, /* bio was bounced */ | |
55 | __BLK_TA_REMAP, /* bio was remapped */ | |
56 | __BLK_TA_ABORT, /* request aborted */ | |
57 | __BLK_TA_DRV_DATA, /* driver-specific binary data */ | |
58 | }; | |
59 | ||
60 | /* | |
61 | * Notify events. | |
62 | */ | |
63 | enum blktrace_notify { | |
64 | __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ | |
65 | __BLK_TN_TIMESTAMP, /* include system clock */ | |
66 | __BLK_TN_MESSAGE, /* Character string message */ | |
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 | */ | |
101 | struct blk_io_trace { | |
102 | __u32 magic; /* MAGIC << 8 | version */ | |
103 | __u32 sequence; /* event number */ | |
104 | __u64 time; /* in microseconds */ | |
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 | }; | |
114 | ||
115 | /* | |
116 | * The remap event | |
117 | */ | |
118 | struct blk_io_trace_remap { | |
119 | __be32 device_from; | |
120 | __be32 device_to; | |
121 | __be64 sector_from; | |
122 | }; | |
123 | ||
124 | enum { | |
125 | Blktrace_setup = 1, | |
126 | Blktrace_running, | |
127 | Blktrace_stopped, | |
128 | }; | |
129 | ||
130 | #define BLKTRACE_BDEV_SIZE 32 | |
131 | ||
132 | /* | |
133 | * User setup structure passed with BLKTRACESTART | |
134 | */ | |
135 | struct blk_user_trace_setup { | |
136 | char name[BLKTRACE_BDEV_SIZE]; /* output */ | |
137 | __u16 act_mask; /* input */ | |
138 | __u32 buf_size; /* input */ | |
139 | __u32 buf_nr; /* input */ | |
140 | __u64 start_lba; | |
141 | __u64 end_lba; | |
142 | __u32 pid; | |
143 | }; | |
144 | ||
145 | #ifdef __KERNEL__ | |
146 | #if defined(CONFIG_BLK_DEV_IO_TRACE) | |
147 | ||
148 | #include <linux/sysfs.h> | |
149 | ||
150 | struct blk_trace { | |
151 | int trace_state; | |
152 | struct rchan *rchan; | |
153 | unsigned long __percpu *sequence; | |
154 | unsigned char __percpu *msg_data; | |
155 | u16 act_mask; | |
156 | u64 start_lba; | |
157 | u64 end_lba; | |
158 | u32 pid; | |
159 | u32 dev; | |
160 | struct dentry *dir; | |
161 | struct dentry *dropped_file; | |
162 | struct dentry *msg_file; | |
163 | atomic_t dropped; | |
164 | }; | |
165 | ||
166 | extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *); | |
167 | extern void blk_trace_shutdown(struct request_queue *); | |
168 | extern int do_blk_trace_setup(struct request_queue *q, char *name, | |
169 | dev_t dev, struct block_device *bdev, | |
170 | struct blk_user_trace_setup *buts); | |
171 | extern void __trace_note_message(struct blk_trace *, const char *fmt, ...); | |
172 | ||
173 | /** | |
174 | * blk_add_trace_msg - Add a (simple) message to the blktrace stream | |
175 | * @q: queue the io is for | |
176 | * @fmt: format to print message in | |
177 | * args... Variable argument list for format | |
178 | * | |
179 | * Description: | |
180 | * Records a (simple) message onto the blktrace stream. | |
181 | * | |
182 | * NOTE: BLK_TN_MAX_MSG characters are output at most. | |
183 | * NOTE: Can not use 'static inline' due to presence of var args... | |
184 | * | |
185 | **/ | |
186 | #define blk_add_trace_msg(q, fmt, ...) \ | |
187 | do { \ | |
188 | struct blk_trace *bt = (q)->blk_trace; \ | |
189 | if (unlikely(bt)) \ | |
190 | __trace_note_message(bt, fmt, ##__VA_ARGS__); \ | |
191 | } while (0) | |
192 | #define BLK_TN_MAX_MSG 128 | |
193 | ||
194 | extern void blk_add_driver_data(struct request_queue *q, struct request *rq, | |
195 | void *data, size_t len); | |
196 | extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
197 | struct block_device *bdev, | |
198 | char __user *arg); | |
199 | extern int blk_trace_startstop(struct request_queue *q, int start); | |
200 | extern int blk_trace_remove(struct request_queue *q); | |
201 | extern void blk_trace_remove_sysfs(struct device *dev); | |
202 | extern int blk_trace_init_sysfs(struct device *dev); | |
203 | ||
204 | extern struct attribute_group blk_trace_attr_group; | |
205 | ||
206 | #else /* !CONFIG_BLK_DEV_IO_TRACE */ | |
207 | # define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY) | |
208 | # define blk_trace_shutdown(q) do { } while (0) | |
209 | # define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY) | |
210 | # define blk_add_driver_data(q, rq, data, len) do {} while (0) | |
211 | # define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY) | |
212 | # define blk_trace_startstop(q, start) (-ENOTTY) | |
213 | # define blk_trace_remove(q) (-ENOTTY) | |
214 | # define blk_add_trace_msg(q, fmt, ...) do { } while (0) | |
215 | # define blk_trace_remove_sysfs(dev) do { } while (0) | |
216 | static inline int blk_trace_init_sysfs(struct device *dev) | |
217 | { | |
218 | return 0; | |
219 | } | |
220 | ||
221 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ | |
222 | ||
223 | #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) | |
224 | ||
225 | static inline int blk_cmd_buf_len(struct request *rq) | |
226 | { | |
227 | return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1; | |
228 | } | |
229 | ||
230 | extern void blk_dump_cmd(char *buf, struct request *rq); | |
231 | extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes); | |
232 | extern void blk_fill_rwbs_rq(char *rwbs, struct request *rq); | |
233 | ||
234 | #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ | |
235 | ||
236 | #endif /* __KERNEL__ */ | |
237 | #endif |