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 */
21 BLK_TC_END = 1 << 15, /* only 16-bits, reminder */
24 #define BLK_TC_SHIFT (16)
25 #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
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 __BLK_TA_PLUG, /* queue was plugged */
40 __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
41 __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
42 __BLK_TA_INSERT, /* insert request */
43 __BLK_TA_SPLIT, /* bio was split */
44 __BLK_TA_BOUNCE, /* bio was bounced */
45 __BLK_TA_REMAP, /* bio was remapped */
49 * Trace actions in full. Additionally, read or write is masked
51 #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
52 #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
53 #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
54 #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
55 #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
56 #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
57 #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
58 #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
59 #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
60 #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
61 #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
62 #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
63 #define BLK_TA_SPLIT (__BLK_TA_SPLIT)
64 #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
65 #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
67 #define BLK_IO_TRACE_MAGIC 0x65617400
68 #define BLK_IO_TRACE_VERSION 0x05
74 __u32 magic; /* MAGIC << 8 | version */
75 __u32 sequence; /* event number */
76 __u64 time; /* in nanoseconds */
77 __u64 sector; /* disk offset */
78 __u32 bytes; /* transfer length */
79 __u32 action; /* what happened */
80 __u32 pid; /* who did it */
81 __u32 cpu; /* on what cpu did it happen */
82 __u16 error; /* completion error */
83 __u16 pdu_len; /* length of data after this trace */
84 __u32 device; /* device identifier (dev_t) */
85 char comm[16]; /* task command name (TASK_COMM_LEN) */
91 struct blk_io_trace_remap {
97 * User setup structure passed with BLKSTARTTRACE
99 struct blk_user_trace_setup {
100 char name[32]; /* output */
101 __u16 act_mask; /* input */
102 __u32 buf_size; /* input */
103 __u32 buf_nr; /* input */
106 #define BLKSTARTTRACE _IOWR(0x12,115,struct blk_user_trace_setup)
107 #define BLKSTOPTRACE _IO(0x12,116)