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1 | #ifndef BLKTRACE_H | |
2 | #define BLKTRACE_H | |
3 | ||
4 | #include <linux/blkdev.h> | |
5 | #include <linux/relay.h> | |
6 | #include <linux/compat.h> | |
7 | #include <uapi/linux/blktrace_api.h> | |
8 | #include <linux/list.h> | |
9 | ||
10 | #if defined(CONFIG_BLK_DEV_IO_TRACE) | |
11 | ||
12 | #include <linux/sysfs.h> | |
13 | ||
14 | struct blk_trace { | |
15 | int trace_state; | |
16 | struct rchan *rchan; | |
17 | unsigned long __percpu *sequence; | |
18 | unsigned char __percpu *msg_data; | |
19 | u16 act_mask; | |
20 | u64 start_lba; | |
21 | u64 end_lba; | |
22 | u32 pid; | |
23 | u32 dev; | |
24 | struct dentry *dir; | |
25 | struct dentry *dropped_file; | |
26 | struct dentry *msg_file; | |
27 | struct list_head running_list; | |
28 | atomic_t dropped; | |
29 | }; | |
30 | ||
31 | extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *); | |
32 | extern void blk_trace_shutdown(struct request_queue *); | |
33 | extern int do_blk_trace_setup(struct request_queue *q, char *name, | |
34 | dev_t dev, struct block_device *bdev, | |
35 | struct blk_user_trace_setup *buts); | |
36 | extern __printf(2, 3) | |
37 | void __trace_note_message(struct blk_trace *, const char *fmt, ...); | |
38 | ||
39 | /** | |
40 | * blk_add_trace_msg - Add a (simple) message to the blktrace stream | |
41 | * @q: queue the io is for | |
42 | * @fmt: format to print message in | |
43 | * args... Variable argument list for format | |
44 | * | |
45 | * Description: | |
46 | * Records a (simple) message onto the blktrace stream. | |
47 | * | |
48 | * NOTE: BLK_TN_MAX_MSG characters are output at most. | |
49 | * NOTE: Can not use 'static inline' due to presence of var args... | |
50 | * | |
51 | **/ | |
52 | #define blk_add_trace_msg(q, fmt, ...) \ | |
53 | do { \ | |
54 | struct blk_trace *bt = (q)->blk_trace; \ | |
55 | if (unlikely(bt)) \ | |
56 | __trace_note_message(bt, fmt, ##__VA_ARGS__); \ | |
57 | } while (0) | |
58 | #define BLK_TN_MAX_MSG 128 | |
59 | ||
60 | extern void blk_add_driver_data(struct request_queue *q, struct request *rq, | |
61 | void *data, size_t len); | |
62 | extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, | |
63 | struct block_device *bdev, | |
64 | char __user *arg); | |
65 | extern int blk_trace_startstop(struct request_queue *q, int start); | |
66 | extern int blk_trace_remove(struct request_queue *q); | |
67 | extern void blk_trace_remove_sysfs(struct device *dev); | |
68 | extern int blk_trace_init_sysfs(struct device *dev); | |
69 | ||
70 | extern struct attribute_group blk_trace_attr_group; | |
71 | ||
72 | #else /* !CONFIG_BLK_DEV_IO_TRACE */ | |
73 | # define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY) | |
74 | # define blk_trace_shutdown(q) do { } while (0) | |
75 | # define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY) | |
76 | # define blk_add_driver_data(q, rq, data, len) do {} while (0) | |
77 | # define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY) | |
78 | # define blk_trace_startstop(q, start) (-ENOTTY) | |
79 | # define blk_trace_remove(q) (-ENOTTY) | |
80 | # define blk_add_trace_msg(q, fmt, ...) do { } while (0) | |
81 | # define blk_trace_remove_sysfs(dev) do { } while (0) | |
82 | static inline int blk_trace_init_sysfs(struct device *dev) | |
83 | { | |
84 | return 0; | |
85 | } | |
86 | ||
87 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ | |
88 | ||
89 | #ifdef CONFIG_COMPAT | |
90 | ||
91 | struct compat_blk_user_trace_setup { | |
92 | char name[BLKTRACE_BDEV_SIZE]; | |
93 | u16 act_mask; | |
94 | u32 buf_size; | |
95 | u32 buf_nr; | |
96 | compat_u64 start_lba; | |
97 | compat_u64 end_lba; | |
98 | u32 pid; | |
99 | }; | |
100 | #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup) | |
101 | ||
102 | #endif | |
103 | ||
104 | #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) | |
105 | ||
106 | static inline int blk_cmd_buf_len(struct request *rq) | |
107 | { | |
108 | return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1; | |
109 | } | |
110 | ||
111 | extern void blk_dump_cmd(char *buf, struct request *rq); | |
112 | extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes); | |
113 | ||
114 | #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ | |
115 | ||
116 | #endif |