1 #ifndef BLKTRACE_H 2 #define BLKTRACE_H 3 4 #include <linux/types.h> 5 #ifdef __KERNEL__ 6 #include <linux/blkdev.h> 7 #include <linux/relay.h> 8 #endif 9 10 /* 11 * Trace categories 12 */ 13 enum blktrace_cat { 14 BLK_TC_READ = 1 << 0, /* reads */ 15 BLK_TC_WRITE = 1 << 1, /* writes */ 16 BLK_TC_BARRIER = 1 << 2, /* barrier */ 17 BLK_TC_SYNC = 1 << 3, /* sync IO */ 18 BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ 19 BLK_TC_REQUEUE = 1 << 5, /* requeueing */ 20 BLK_TC_ISSUE = 1 << 6, /* issue */ 21 BLK_TC_COMPLETE = 1 << 7, /* completions */ 22 BLK_TC_FS = 1 << 8, /* fs requests */ 23 BLK_TC_PC = 1 << 9, /* pc requests */ 24 BLK_TC_NOTIFY = 1 << 10, /* special message */ 25 BLK_TC_AHEAD = 1 << 11, /* readahead */ 26 BLK_TC_META = 1 << 12, /* metadata */ 27 BLK_TC_DISCARD = 1 << 13, /* discard requests */ 28 BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */ 29 30 BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ 31 }; 32 33 #define BLK_TC_SHIFT (16) 34 #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) 35 36 /* 37 * Basic trace actions 38 */ 39 enum blktrace_act { 40 __BLK_TA_QUEUE = 1, /* queued */ 41 __BLK_TA_BACKMERGE, /* back merged to existing rq */ 42 __BLK_TA_FRONTMERGE, /* front merge to existing rq */ 43 __BLK_TA_GETRQ, /* allocated new request */ 44 __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ 45 __BLK_TA_REQUEUE, /* request requeued */ 46 __BLK_TA_ISSUE, /* sent to driver */ 47 __BLK_TA_COMPLETE, /* completed by driver */ 48 __BLK_TA_PLUG, /* queue was plugged */ 49 __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ 50 __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ 51 __BLK_TA_INSERT, /* insert request */ 52 __BLK_TA_SPLIT, /* bio was split */ 53 __BLK_TA_BOUNCE, /* bio was bounced */ 54 __BLK_TA_REMAP, /* bio was remapped */ 55 __BLK_TA_ABORT, /* request aborted */ 56 __BLK_TA_DRV_DATA, /* driver-specific binary data */ 57 }; 58 59 /* 60 * Notify events. 61 */ 62 enum blktrace_notify { 63 __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ 64 __BLK_TN_TIMESTAMP, /* include system clock */ 65 __BLK_TN_MESSAGE, /* Character string message */ 66 }; 67 68 69 /* 70 * Trace actions in full. Additionally, read or write is masked 71 */ 72 #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) 73 #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 74 #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) 75 #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 76 #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) 77 #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) 78 #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) 79 #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) 80 #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) 81 #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) 82 #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) 83 #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) 84 #define BLK_TA_SPLIT (__BLK_TA_SPLIT) 85 #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) 86 #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) 87 #define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) 88 #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) 89 90 #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) 91 #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) 92 #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) 93 94 #define BLK_IO_TRACE_MAGIC 0x65617400 95 #define BLK_IO_TRACE_VERSION 0x07 96 97 /* 98 * The trace itself 99 */ 100 struct blk_io_trace { 101 __u32 magic; /* MAGIC << 8 | version */ 102 __u32 sequence; /* event number */ 103 __u64 time; /* in microseconds */ 104 __u64 sector; /* disk offset */ 105 __u32 bytes; /* transfer length */ 106 __u32 action; /* what happened */ 107 __u32 pid; /* who did it */ 108 __u32 device; /* device number */ 109 __u32 cpu; /* on what cpu did it happen */ 110 __u16 error; /* completion error */ 111 __u16 pdu_len; /* length of data after this trace */ 112 }; 113 114 /* 115 * The remap event 116 */ 117 struct blk_io_trace_remap { 118 __be32 device; 119 __be32 device_from; 120 __be64 sector; 121 }; 122 123 enum { 124 Blktrace_setup = 1, 125 Blktrace_running, 126 Blktrace_stopped, 127 }; 128 129 #define BLKTRACE_BDEV_SIZE 32 130 131 /* 132 * User setup structure passed with BLKTRACESTART 133 */ 134 struct blk_user_trace_setup { 135 char name[BLKTRACE_BDEV_SIZE]; /* 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 #ifdef __KERNEL__ 145 #if defined(CONFIG_BLK_DEV_IO_TRACE) 146 struct blk_trace { 147 int trace_state; 148 struct rchan *rchan; 149 unsigned long *sequence; 150 unsigned char *msg_data; 151 u16 act_mask; 152 u64 start_lba; 153 u64 end_lba; 154 u32 pid; 155 u32 dev; 156 struct dentry *dir; 157 struct dentry *dropped_file; 158 struct dentry *msg_file; 159 atomic_t dropped; 160 }; 161 162 extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *); 163 extern void blk_trace_shutdown(struct request_queue *); 164 extern int do_blk_trace_setup(struct request_queue *q, 165 char *name, dev_t dev, struct blk_user_trace_setup *buts); 166 extern void __trace_note_message(struct blk_trace *, const char *fmt, ...); 167 168 /** 169 * blk_add_trace_msg - Add a (simple) message to the blktrace stream 170 * @q: queue the io is for 171 * @fmt: format to print message in 172 * args... Variable argument list for format 173 * 174 * Description: 175 * Records a (simple) message onto the blktrace stream. 176 * 177 * NOTE: BLK_TN_MAX_MSG characters are output at most. 178 * NOTE: Can not use 'static inline' due to presence of var args... 179 * 180 **/ 181 #define blk_add_trace_msg(q, fmt, ...) \ 182 do { \ 183 struct blk_trace *bt = (q)->blk_trace; \ 184 if (unlikely(bt)) \ 185 __trace_note_message(bt, fmt, ##__VA_ARGS__); \ 186 } while (0) 187 #define BLK_TN_MAX_MSG 128 188 189 extern void blk_add_driver_data(struct request_queue *q, struct request *rq, 190 void *data, size_t len); 191 extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, 192 char __user *arg); 193 extern int blk_trace_startstop(struct request_queue *q, int start); 194 extern int blk_trace_remove(struct request_queue *q); 195 196 #else /* !CONFIG_BLK_DEV_IO_TRACE */ 197 #define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY) 198 #define blk_trace_shutdown(q) do { } while (0) 199 #define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY) 200 #define blk_add_driver_data(q, rq, data, len) do {} while (0) 201 #define blk_trace_setup(q, name, dev, arg) (-ENOTTY) 202 #define blk_trace_startstop(q, start) (-ENOTTY) 203 #define blk_trace_remove(q) (-ENOTTY) 204 #define blk_add_trace_msg(q, fmt, ...) do { } while (0) 205 206 #endif /* CONFIG_BLK_DEV_IO_TRACE */ 207 #endif /* __KERNEL__ */ 208 #endif 209