LXR linux/include/uapi/linux/blktrace

   1#ifndef _UAPIBLKTRACE_H
   2#define _UAPIBLKTRACE_H
   3
   4#include <linux/types.h>
   5
   6/*
   7 * Trace categories
   8 */
   9enum blktrace_cat {
  10        BLK_TC_READ     = 1 << 0,       /* reads */
  11        BLK_TC_WRITE    = 1 << 1,       /* writes */
  12        BLK_TC_FLUSH    = 1 << 2,       /* flush */
  13        BLK_TC_SYNC     = 1 << 3,       /* sync IO */
  14        BLK_TC_SYNCIO   = BLK_TC_SYNC,
  15        BLK_TC_QUEUE    = 1 << 4,       /* queueing/merging */
  16        BLK_TC_REQUEUE  = 1 << 5,       /* requeueing */
  17        BLK_TC_ISSUE    = 1 << 6,       /* issue */
  18        BLK_TC_COMPLETE = 1 << 7,       /* completions */
  19        BLK_TC_FS       = 1 << 8,       /* fs requests */
  20        BLK_TC_PC       = 1 << 9,       /* pc requests */
  21        BLK_TC_NOTIFY   = 1 << 10,      /* special message */
  22        BLK_TC_AHEAD    = 1 << 11,      /* readahead */
  23        BLK_TC_META     = 1 << 12,      /* metadata */
  24        BLK_TC_DISCARD  = 1 << 13,      /* discard requests */
  25        BLK_TC_DRV_DATA = 1 << 14,      /* binary per-driver data */
  26        BLK_TC_FUA      = 1 << 15,      /* fua requests */
  27
  28        BLK_TC_END      = 1 << 15,      /* we've run out of bits! */
  29};
  30
  31#define BLK_TC_SHIFT            (16)
  32#define BLK_TC_ACT(act)         ((act) << BLK_TC_SHIFT)
  33
  34/*
  35 * Basic trace actions
  36 */
  37enum blktrace_act {
  38        __BLK_TA_QUEUE = 1,             /* queued */
  39        __BLK_TA_BACKMERGE,             /* back merged to existing rq */
  40        __BLK_TA_FRONTMERGE,            /* front merge to existing rq */
  41        __BLK_TA_GETRQ,                 /* allocated new request */
  42        __BLK_TA_SLEEPRQ,               /* sleeping on rq allocation */
  43        __BLK_TA_REQUEUE,               /* request requeued */
  44        __BLK_TA_ISSUE,                 /* sent to driver */
  45        __BLK_TA_COMPLETE,              /* completed by driver */
  46        __BLK_TA_PLUG,                  /* queue was plugged */
  47        __BLK_TA_UNPLUG_IO,             /* queue was unplugged by io */
  48        __BLK_TA_UNPLUG_TIMER,          /* queue was unplugged by timer */
  49        __BLK_TA_INSERT,                /* insert request */
  50        __BLK_TA_SPLIT,                 /* bio was split */
  51        __BLK_TA_BOUNCE,                /* bio was bounced */
  52        __BLK_TA_REMAP,                 /* bio was remapped */
  53        __BLK_TA_ABORT,                 /* request aborted */
  54        __BLK_TA_DRV_DATA,              /* driver-specific binary data */
  55};
  56
  57/*
  58 * Notify events.
  59 */
  60enum blktrace_notify {
  61        __BLK_TN_PROCESS = 0,           /* establish pid/name mapping */
  62        __BLK_TN_TIMESTAMP,             /* include system clock */
  63        __BLK_TN_MESSAGE,               /* Character string message */
  64};
  65
  66
  67/*
  68 * Trace actions in full. Additionally, read or write is masked
  69 */
  70#define BLK_TA_QUEUE            (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
  71#define BLK_TA_BACKMERGE        (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
  72#define BLK_TA_FRONTMERGE       (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
  73#define BLK_TA_GETRQ            (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
  74#define BLK_TA_SLEEPRQ          (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
  75#define BLK_TA_REQUEUE          (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
  76#define BLK_TA_ISSUE            (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
  77#define BLK_TA_COMPLETE         (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
  78#define BLK_TA_PLUG             (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
  79#define BLK_TA_UNPLUG_IO        (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
  80#define BLK_TA_UNPLUG_TIMER     (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
  81#define BLK_TA_INSERT           (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
  82#define BLK_TA_SPLIT            (__BLK_TA_SPLIT)
  83#define BLK_TA_BOUNCE           (__BLK_TA_BOUNCE)
  84#define BLK_TA_REMAP            (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
  85#define BLK_TA_ABORT            (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
  86#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
  87
  88#define BLK_TN_PROCESS          (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
  89#define BLK_TN_TIMESTAMP        (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
  90#define BLK_TN_MESSAGE          (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
  91
  92#define BLK_IO_TRACE_MAGIC      0x65617400
  93#define BLK_IO_TRACE_VERSION    0x07
  94
  95/*
  96 * The trace itself
  97 */
  98struct blk_io_trace {
  99        __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 */
 115struct blk_io_trace_remap {
 116        __be32 device_from;
 117        __be32 device_to;
 118        __be64 sector_from;
 119};
 120
 121enum {
 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 */
 132struct 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 /* _UAPIBLKTRACE_H */
 143