36d2bf71 |
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 |