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-rw-r--r--include/linux/blktrace_api.h254
1 files changed, 254 insertions, 0 deletions
diff --git a/include/linux/blktrace_api.h b/include/linux/blktrace_api.h
new file mode 100644
index 00000000..4d1a0748
--- /dev/null
+++ b/include/linux/blktrace_api.h
@@ -0,0 +1,254 @@
+#ifndef BLKTRACE_H
+#define BLKTRACE_H
+
+#include <linux/types.h>
+#ifdef __KERNEL__
+#include <linux/blkdev.h>
+#include <linux/relay.h>
+#include <linux/compat.h>
+#endif
+
+/*
+ * Trace categories
+ */
+enum blktrace_cat {
+ BLK_TC_READ = 1 << 0, /* reads */
+ BLK_TC_WRITE = 1 << 1, /* writes */
+ BLK_TC_FLUSH = 1 << 2, /* flush */
+ BLK_TC_SYNC = 1 << 3, /* sync IO */
+ BLK_TC_SYNCIO = BLK_TC_SYNC,
+ BLK_TC_QUEUE = 1 << 4, /* queueing/merging */
+ BLK_TC_REQUEUE = 1 << 5, /* requeueing */
+ BLK_TC_ISSUE = 1 << 6, /* issue */
+ BLK_TC_COMPLETE = 1 << 7, /* completions */
+ BLK_TC_FS = 1 << 8, /* fs requests */
+ BLK_TC_PC = 1 << 9, /* pc requests */
+ BLK_TC_NOTIFY = 1 << 10, /* special message */
+ BLK_TC_AHEAD = 1 << 11, /* readahead */
+ BLK_TC_META = 1 << 12, /* metadata */
+ BLK_TC_DISCARD = 1 << 13, /* discard requests */
+ BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */
+ BLK_TC_FUA = 1 << 15, /* fua requests */
+
+ BLK_TC_END = 1 << 15, /* we've run out of bits! */
+};
+
+#define BLK_TC_SHIFT (16)
+#define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT)
+
+/*
+ * Basic trace actions
+ */
+enum blktrace_act {
+ __BLK_TA_QUEUE = 1, /* queued */
+ __BLK_TA_BACKMERGE, /* back merged to existing rq */
+ __BLK_TA_FRONTMERGE, /* front merge to existing rq */
+ __BLK_TA_GETRQ, /* allocated new request */
+ __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */
+ __BLK_TA_REQUEUE, /* request requeued */
+ __BLK_TA_ISSUE, /* sent to driver */
+ __BLK_TA_COMPLETE, /* completed by driver */
+ __BLK_TA_PLUG, /* queue was plugged */
+ __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */
+ __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */
+ __BLK_TA_INSERT, /* insert request */
+ __BLK_TA_SPLIT, /* bio was split */
+ __BLK_TA_BOUNCE, /* bio was bounced */
+ __BLK_TA_REMAP, /* bio was remapped */
+ __BLK_TA_ABORT, /* request aborted */
+ __BLK_TA_DRV_DATA, /* driver-specific binary data */
+};
+
+/*
+ * Notify events.
+ */
+enum blktrace_notify {
+ __BLK_TN_PROCESS = 0, /* establish pid/name mapping */
+ __BLK_TN_TIMESTAMP, /* include system clock */
+ __BLK_TN_MESSAGE, /* Character string message */
+};
+
+
+/*
+ * Trace actions in full. Additionally, read or write is masked
+ */
+#define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE))
+#define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE))
+#define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE))
+#define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_SPLIT (__BLK_TA_SPLIT)
+#define BLK_TA_BOUNCE (__BLK_TA_BOUNCE)
+#define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE))
+#define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA))
+
+#define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY))
+#define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY))
+#define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY))
+
+#define BLK_IO_TRACE_MAGIC 0x65617400
+#define BLK_IO_TRACE_VERSION 0x07
+
+/*
+ * The trace itself
+ */
+struct blk_io_trace {
+ __u32 magic; /* MAGIC << 8 | version */
+ __u32 sequence; /* event number */
+ __u64 time; /* in microseconds */
+ __u64 sector; /* disk offset */
+ __u32 bytes; /* transfer length */
+ __u32 action; /* what happened */
+ __u32 pid; /* who did it */
+ __u32 device; /* device number */
+ __u32 cpu; /* on what cpu did it happen */
+ __u16 error; /* completion error */
+ __u16 pdu_len; /* length of data after this trace */
+};
+
+/*
+ * The remap event
+ */
+struct blk_io_trace_remap {
+ __be32 device_from;
+ __be32 device_to;
+ __be64 sector_from;
+};
+
+enum {
+ Blktrace_setup = 1,
+ Blktrace_running,
+ Blktrace_stopped,
+};
+
+#define BLKTRACE_BDEV_SIZE 32
+
+/*
+ * User setup structure passed with BLKTRACESTART
+ */
+struct blk_user_trace_setup {
+ char name[BLKTRACE_BDEV_SIZE]; /* output */
+ __u16 act_mask; /* input */
+ __u32 buf_size; /* input */
+ __u32 buf_nr; /* input */
+ __u64 start_lba;
+ __u64 end_lba;
+ __u32 pid;
+};
+
+#ifdef __KERNEL__
+#if defined(CONFIG_BLK_DEV_IO_TRACE)
+
+#include <linux/sysfs.h>
+
+struct blk_trace {
+ int trace_state;
+ struct rchan *rchan;
+ unsigned long __percpu *sequence;
+ unsigned char __percpu *msg_data;
+ u16 act_mask;
+ u64 start_lba;
+ u64 end_lba;
+ u32 pid;
+ u32 dev;
+ struct dentry *dir;
+ struct dentry *dropped_file;
+ struct dentry *msg_file;
+ atomic_t dropped;
+};
+
+extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
+extern void blk_trace_shutdown(struct request_queue *);
+extern int do_blk_trace_setup(struct request_queue *q, char *name,
+ dev_t dev, struct block_device *bdev,
+ struct blk_user_trace_setup *buts);
+extern __printf(2, 3)
+void __trace_note_message(struct blk_trace *, const char *fmt, ...);
+
+/**
+ * blk_add_trace_msg - Add a (simple) message to the blktrace stream
+ * @q: queue the io is for
+ * @fmt: format to print message in
+ * args... Variable argument list for format
+ *
+ * Description:
+ * Records a (simple) message onto the blktrace stream.
+ *
+ * NOTE: BLK_TN_MAX_MSG characters are output at most.
+ * NOTE: Can not use 'static inline' due to presence of var args...
+ *
+ **/
+#define blk_add_trace_msg(q, fmt, ...) \
+ do { \
+ struct blk_trace *bt = (q)->blk_trace; \
+ if (unlikely(bt)) \
+ __trace_note_message(bt, fmt, ##__VA_ARGS__); \
+ } while (0)
+#define BLK_TN_MAX_MSG 128
+
+extern void blk_add_driver_data(struct request_queue *q, struct request *rq,
+ void *data, size_t len);
+extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
+ struct block_device *bdev,
+ char __user *arg);
+extern int blk_trace_startstop(struct request_queue *q, int start);
+extern int blk_trace_remove(struct request_queue *q);
+extern void blk_trace_remove_sysfs(struct device *dev);
+extern int blk_trace_init_sysfs(struct device *dev);
+
+extern struct attribute_group blk_trace_attr_group;
+
+#else /* !CONFIG_BLK_DEV_IO_TRACE */
+# define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
+# define blk_trace_shutdown(q) do { } while (0)
+# define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY)
+# define blk_add_driver_data(q, rq, data, len) do {} while (0)
+# define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
+# define blk_trace_startstop(q, start) (-ENOTTY)
+# define blk_trace_remove(q) (-ENOTTY)
+# define blk_add_trace_msg(q, fmt, ...) do { } while (0)
+# define blk_trace_remove_sysfs(dev) do { } while (0)
+static inline int blk_trace_init_sysfs(struct device *dev)
+{
+ return 0;
+}
+
+#endif /* CONFIG_BLK_DEV_IO_TRACE */
+
+#ifdef CONFIG_COMPAT
+
+struct compat_blk_user_trace_setup {
+ char name[32];
+ u16 act_mask;
+ u32 buf_size;
+ u32 buf_nr;
+ compat_u64 start_lba;
+ compat_u64 end_lba;
+ u32 pid;
+};
+#define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
+
+#endif
+
+#if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK)
+
+static inline int blk_cmd_buf_len(struct request *rq)
+{
+ return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1;
+}
+
+extern void blk_dump_cmd(char *buf, struct request *rq);
+extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes);
+
+#endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */
+
+#endif /* __KERNEL__ */
+#endif