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001: #ifndef BLKTRACE_H
002: #define BLKTRACE_H
003: 
004: #include <linux/types.h>
005: 
006: /*
007:  * Trace categories
008:  */
009: enum blktrace_cat {
010:         BLK_TC_READ     = 1 << 0,       /* reads */
011:         BLK_TC_WRITE    = 1 << 1,       /* writes */
012:         BLK_TC_FLUSH    = 1 << 2,       /* flush */
013:         BLK_TC_SYNC     = 1 << 3,       /* sync IO */
014:         BLK_TC_SYNCIO   = BLK_TC_SYNC,
015:         BLK_TC_QUEUE    = 1 << 4,       /* queueing/merging */
016:         BLK_TC_REQUEUE  = 1 << 5,       /* requeueing */
017:         BLK_TC_ISSUE    = 1 << 6,       /* issue */
018:         BLK_TC_COMPLETE = 1 << 7,       /* completions */
019:         BLK_TC_FS       = 1 << 8,       /* fs requests */
020:         BLK_TC_PC       = 1 << 9,       /* pc requests */
021:         BLK_TC_NOTIFY   = 1 << 10,      /* special message */
022:         BLK_TC_AHEAD    = 1 << 11,      /* readahead */
023:         BLK_TC_META     = 1 << 12,      /* metadata */
024:         BLK_TC_DISCARD  = 1 << 13,      /* discard requests */
025:         BLK_TC_DRV_DATA = 1 << 14,      /* binary per-driver data */
026:         BLK_TC_FUA      = 1 << 15,      /* fua requests */
027: 
028:         BLK_TC_END      = 1 << 15,      /* we've run out of bits! */
029: };
030: 
031: #define BLK_TC_SHIFT            (16)
032: #define BLK_TC_ACT(act)         ((act) << BLK_TC_SHIFT)
033: 
034: /*
035:  * Basic trace actions
036:  */
037: enum blktrace_act {
038:         __BLK_TA_QUEUE = 1,             /* queued */
039:         __BLK_TA_BACKMERGE,             /* back merged to existing rq */
040:         __BLK_TA_FRONTMERGE,            /* front merge to existing rq */
041:         __BLK_TA_GETRQ,                 /* allocated new request */
042:         __BLK_TA_SLEEPRQ,               /* sleeping on rq allocation */
043:         __BLK_TA_REQUEUE,               /* request requeued */
044:         __BLK_TA_ISSUE,                 /* sent to driver */
045:         __BLK_TA_COMPLETE,              /* completed by driver */
046:         __BLK_TA_PLUG,                  /* queue was plugged */
047:         __BLK_TA_UNPLUG_IO,             /* queue was unplugged by io */
048:         __BLK_TA_UNPLUG_TIMER,          /* queue was unplugged by timer */
049:         __BLK_TA_INSERT,                /* insert request */
050:         __BLK_TA_SPLIT,                 /* bio was split */
051:         __BLK_TA_BOUNCE,                /* bio was bounced */
052:         __BLK_TA_REMAP,                 /* bio was remapped */
053:         __BLK_TA_ABORT,                 /* request aborted */
054:         __BLK_TA_DRV_DATA,              /* driver-specific binary data */
055: };
056: 
057: /*
058:  * Notify events.
059:  */
060: enum blktrace_notify {
061:         __BLK_TN_PROCESS = 0,           /* establish pid/name mapping */
062:         __BLK_TN_TIMESTAMP,             /* include system clock */
063:         __BLK_TN_MESSAGE,               /* Character string message */
064: };
065: 
066: 
067: /*
068:  * Trace actions in full. Additionally, read or write is masked
069:  */
070: #define BLK_TA_QUEUE            (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
071: #define BLK_TA_BACKMERGE        (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
072: #define BLK_TA_FRONTMERGE       (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
073: #define BLK_TA_GETRQ            (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
074: #define BLK_TA_SLEEPRQ          (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
075: #define BLK_TA_REQUEUE          (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
076: #define BLK_TA_ISSUE            (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
077: #define BLK_TA_COMPLETE         (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
078: #define BLK_TA_PLUG             (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
079: #define BLK_TA_UNPLUG_IO        (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
080: #define BLK_TA_UNPLUG_TIMER     (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
081: #define BLK_TA_INSERT           (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
082: #define BLK_TA_SPLIT            (__BLK_TA_SPLIT)
083: #define BLK_TA_BOUNCE           (__BLK_TA_BOUNCE)
084: #define BLK_TA_REMAP            (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
085: #define BLK_TA_ABORT            (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
086: #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
087: 
088: #define BLK_TN_PROCESS          (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
089: #define BLK_TN_TIMESTAMP        (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
090: #define BLK_TN_MESSAGE          (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
091: 
092: #define BLK_IO_TRACE_MAGIC      0x65617400
093: #define BLK_IO_TRACE_VERSION    0x07
094: 
095: /*
096:  * The trace itself
097:  */
098: struct blk_io_trace {
099:         __u32 magic;            /* MAGIC << 8 | version */
100:         __u32 sequence;         /* event number */
101:         __u64 time;             /* in microseconds */
102:         __u64 sector;           /* disk offset */
103:         __u32 bytes;            /* transfer length */
104:         __u32 action;           /* what happened */
105:         __u32 pid;              /* who did it */
106:         __u32 device;           /* device number */
107:         __u32 cpu;              /* on what cpu did it happen */
108:         __u16 error;            /* completion error */
109:         __u16 pdu_len;          /* length of data after this trace */
110: };
111: 
112: /*
113:  * The remap event
114:  */
115: struct blk_io_trace_remap {
116:         __be32 device_from;
117:         __be32 device_to;
118:         __be64 sector_from;
119: };
120: 
121: enum {
122:         Blktrace_setup = 1,
123:         Blktrace_running,
124:         Blktrace_stopped,
125: };
126: 
127: #define BLKTRACE_BDEV_SIZE      32
128: 
129: /*
130:  * User setup structure passed with BLKTRACESTART
131:  */
132: struct blk_user_trace_setup {
133:         char name[BLKTRACE_BDEV_SIZE];  /* output */
134:         __u16 act_mask;                 /* input */
135:         __u32 buf_size;                 /* input */
136:         __u32 buf_nr;                   /* input */
137:         __u64 start_lba;
138:         __u64 end_lba;
139:         __u32 pid;
140: };
141: 
142: #endif
143: 

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