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1 | #ifndef BLKTRACEAPI_H |
2 | #define BLKTRACEAPI_H | |
3 | ||
4 | #include <asm/types.h> | |
5 | ||
6 | /* | |
7 | * Trace categories | |
8 | */ | |
9 | enum { | |
10 | BLK_TC_READ = 1 << 0, /* reads */ | |
11 | BLK_TC_WRITE = 1 << 1, /* writes */ | |
12 | BLK_TC_BARRIER = 1 << 2, /* barrier */ | |
13 | BLK_TC_SYNC = 1 << 3, /* barrier */ | |
14 | BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ | |
15 | BLK_TC_REQUEUE = 1 << 5, /* requeueing */ | |
16 | BLK_TC_ISSUE = 1 << 6, /* issue */ | |
17 | BLK_TC_COMPLETE = 1 << 7, /* completions */ | |
18 | BLK_TC_FS = 1 << 8, /* fs requests */ | |
19 | BLK_TC_PC = 1 << 9, /* pc requests */ | |
20 | ||
21 | BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ | |
22 | }; | |
23 | ||
24 | #define BLK_TC_SHIFT (16) | |
25 | #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) | |
26 | ||
27 | /* | |
28 | * Basic trace actions | |
29 | */ | |
30 | enum { | |
31 | __BLK_TA_QUEUE = 1, /* queued */ | |
32 | __BLK_TA_BACKMERGE, /* back merged to existing rq */ | |
33 | __BLK_TA_FRONTMERGE, /* front merge to existing rq */ | |
34 | __BLK_TA_GETRQ, /* allocated new request */ | |
35 | __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ | |
36 | __BLK_TA_REQUEUE, /* request requeued */ | |
37 | __BLK_TA_ISSUE, /* sent to driver */ | |
38 | __BLK_TA_COMPLETE, /* completed by driver */ | |
39 | }; | |
40 | ||
41 | /* | |
42 | * Trace actions in full. Additionally, read or write is masked | |
43 | */ | |
44 | #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
45 | #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
46 | #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
47 | #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) | |
48 | #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) | |
49 | #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) | |
50 | #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) | |
51 | #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) | |
52 | ||
53 | #define BLK_IO_TRACE_MAGIC 0x65617400 | |
654aaa52 | 54 | #define BLK_IO_TRACE_VERSION 0x04 |
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55 | |
56 | /* | |
57 | * The trace itself | |
58 | */ | |
59 | struct blk_io_trace { | |
60 | __u32 magic; /* MAGIC << 8 | version */ | |
61 | __u32 sequence; /* event number */ | |
f8fd8985 | 62 | __u64 time; /* in nanoseconds */ |
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63 | __u64 sector; /* disk offset */ |
64 | __u32 bytes; /* transfer length */ | |
65 | __u32 action; /* what happened */ | |
66 | __u32 pid; /* who did it */ | |
654aaa52 | 67 | __u32 cpu; /* on what cpu did it happen */ |
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68 | __u16 error; /* completion error */ |
69 | __u16 pdu_len; /* length of data after this trace */ | |
654aaa52 | 70 | char comm[16]; /* task command name (TASK_COMM_LEN) */ |
6fe4709e JA |
71 | }; |
72 | ||
73 | /* | |
74 | * User setup structure passed with BLKSTARTTRACE | |
75 | */ | |
76 | struct blk_user_trace_setup { | |
77 | char name[32]; /* output */ | |
78 | __u16 act_mask; /* input */ | |
79 | __u32 buf_size; /* input */ | |
80 | __u32 buf_nr; /* input */ | |
81 | }; | |
82 | ||
83 | #define BLKSTARTTRACE _IOWR(0x12,115,struct blk_user_trace_setup) | |
84 | #define BLKSTOPTRACE _IO(0x12,116) | |
85 | ||
86 | #endif |