| 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 blktrace_act { |
| 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 | /* |
| 61 | * Trace actions in full. Additionally, read or write is masked |
| 62 | */ |
| 63 | #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 64 | #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 65 | #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 66 | #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 67 | #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 68 | #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) |
| 69 | #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) |
| 70 | #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) |
| 71 | #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 72 | #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 73 | #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 74 | #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 75 | #define BLK_TA_SPLIT (__BLK_TA_SPLIT) |
| 76 | #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) |
| 77 | #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) |
| 78 | |
| 79 | #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) |
| 80 | #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) |
| 81 | |
| 82 | #define BLK_IO_TRACE_MAGIC 0x65617400 |
| 83 | #define BLK_IO_TRACE_VERSION 0x07 |
| 84 | |
| 85 | /* |
| 86 | * The trace itself |
| 87 | */ |
| 88 | //struct blk_io_trace { |
| 89 | // u32 magic; /* MAGIC << 8 | version */ |
| 90 | // u32 sequence; /* event number */ |
| 91 | // u64 time; /* in microseconds */ |
| 92 | // u64 sector; /* disk offset */ |
| 93 | // u32 bytes; /* transfer length */ |
| 94 | // u32 action; /* what happened */ |
| 95 | // u32 pid; /* who did it */ |
| 96 | // u32 device; /* device number */ |
| 97 | // u32 cpu; /* on what cpu did it happen */ |
| 98 | // u16 error; /* completion error */ |
| 99 | // u16 pdu_len; /* length of data after this trace */ |
| 100 | //}; |
| 101 | |
| 102 | /* |
| 103 | * The remap event |
| 104 | */ |
| 105 | //struct blk_io_trace_remap { |
| 106 | // __be32 device; |
| 107 | // __be32 device_from; |
| 108 | // __be64 sector; |
| 109 | //}; |
| 110 | |
| 111 | enum { |
| 112 | Blktrace_setup = 1, |
| 113 | Blktrace_running, |
| 114 | Blktrace_stopped, |
| 115 | }; |
| 116 | |
| 117 | struct blk_trace { |
| 118 | int trace_state; |
| 119 | // struct rchan *rchan; |
| 120 | // unsigned long *sequence; |
| 121 | // u16 act_mask; |
| 122 | // u64 start_lba; |
| 123 | // u64 end_lba; |
| 124 | // u32 pid; |
| 125 | __u32 dev; |
| 126 | // struct dentry *dir; |
| 127 | // struct dentry *dropped_file; |
| 128 | // atomic_t dropped; |
| 129 | }; |
| 130 | |
| 131 | /* |
| 132 | * User setup structure passed with BLKSTARTTRACE |
| 133 | */ |
| 134 | struct blk_user_trace_setup { |
| 135 | char name[32]; /* output */ |
| 136 | // __u16 act_mask; /* input */ |
| 137 | // __u32 buf_size; /* input */ |
| 138 | // __u32 buf_nr; /* input */ |
| 139 | // __u64 start_lba; |
| 140 | // __u64 end_lba; |
| 141 | // __u32 pid; |
| 142 | }; |
| 143 | |
| 144 | #define BLKTRACESETUP _IOWR(0x12,115,struct blk_user_trace_setup) |
| 145 | #define BLKTRACESTART _IO(0x12,116) |
| 146 | #define BLKTRACESTOP _IO(0x12,117) |
| 147 | #define BLKTRACETEARDOWN _IO(0x12,118) |
| 148 | |
| 149 | #endif |