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fb7b71a3 JA |
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, /* sync */ | |
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 | BLK_TC_NOTIFY = 1 << 10, /* special message */ | |
21 | BLK_TC_AHEAD = 1 << 11, /* readahead */ | |
22 | BLK_TC_META = 1 << 12, /* metadata */ | |
23 | ||
24 | BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ | |
25 | }; | |
26 | ||
27 | #define BLK_TC_SHIFT (16) | |
28 | #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) | |
29 | ||
30 | /* | |
31 | * Basic trace actions | |
32 | */ | |
33 | enum { | |
34 | __BLK_TA_QUEUE = 1, /* queued */ | |
35 | __BLK_TA_BACKMERGE, /* back merged to existing rq */ | |
36 | __BLK_TA_FRONTMERGE, /* front merge to existing rq */ | |
37 | __BLK_TA_GETRQ, /* allocated new request */ | |
38 | __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ | |
39 | __BLK_TA_REQUEUE, /* request requeued */ | |
40 | __BLK_TA_ISSUE, /* sent to driver */ | |
41 | __BLK_TA_COMPLETE, /* completed by driver */ | |
42 | __BLK_TA_PLUG, /* queue was plugged */ | |
43 | __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ | |
44 | __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ | |
45 | __BLK_TA_INSERT, /* insert request */ | |
46 | __BLK_TA_SPLIT, /* bio was split */ | |
47 | __BLK_TA_BOUNCE, /* bio was bounced */ | |
48 | __BLK_TA_REMAP, /* bio was remapped */ | |
49 | }; | |
50 | ||
51 | /* | |
52 | * Notify events. | |
53 | */ | |
54 | enum blktrace_notify { | |
55 | __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ | |
56 | __BLK_TN_TIMESTAMP, /* include system clock */ | |
57 | }; | |
58 | ||
59 | /* | |
60 | * Trace actions in full. Additionally, read or write is masked | |
61 | */ | |
62 | #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
63 | #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
64 | #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) | |
65 | #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) | |
66 | #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) | |
67 | #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) | |
68 | #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) | |
69 | #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) | |
70 | #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) | |
71 | #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) | |
72 | #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) | |
73 | #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) | |
74 | #define BLK_TA_SPLIT (__BLK_TA_SPLIT) | |
75 | #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) | |
76 | #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) | |
77 | ||
78 | #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) | |
79 | #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) | |
80 | ||
81 | #define BLK_IO_TRACE_MAGIC 0x65617400 | |
82 | #define BLK_IO_TRACE_VERSION 0x07 | |
83 | ||
84 | /* | |
85 | * The trace itself | |
86 | */ | |
87 | struct blk_io_trace { | |
88 | __u32 magic; /* MAGIC << 8 | version */ | |
89 | __u32 sequence; /* event number */ | |
90 | __u64 time; /* in nanoseconds */ | |
91 | __u64 sector; /* disk offset */ | |
92 | __u32 bytes; /* transfer length */ | |
93 | __u32 action; /* what happened */ | |
94 | __u32 pid; /* who did it */ | |
95 | __u32 device; /* device identifier (dev_t) */ | |
96 | __u32 cpu; /* on what cpu did it happen */ | |
97 | __u16 error; /* completion error */ | |
98 | __u16 pdu_len; /* length of data after this trace */ | |
99 | }; | |
100 | ||
101 | /* | |
102 | * The remap event | |
103 | */ | |
104 | struct blk_io_trace_remap { | |
105 | __u32 device; | |
106 | __u32 device_from; | |
107 | __u64 sector; | |
108 | }; | |
109 | ||
110 | /* | |
111 | * User setup structure passed with BLKSTARTTRACE | |
112 | */ | |
113 | struct blk_user_trace_setup { | |
114 | char name[32]; /* output */ | |
115 | __u16 act_mask; /* input */ | |
116 | __u32 buf_size; /* input */ | |
117 | __u32 buf_nr; /* input */ | |
118 | __u64 start_lba; | |
119 | __u64 end_lba; | |
120 | __u32 pid; | |
121 | }; | |
122 | ||
123 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) | |
124 | #define BLKTRACESTART _IO(0x12,116) | |
125 | #define BLKTRACESTOP _IO(0x12,117) | |
126 | #define BLKTRACETEARDOWN _IO(0x12,118) | |
127 | ||
128 | #endif |