| 1 | #ifndef BLKTRACE_H |
| 2 | #define BLKTRACE_H |
| 3 | |
| 4 | #include <linux/blkdev.h> |
| 5 | #include <linux/relay.h> |
| 6 | #include <linux/compat.h> |
| 7 | #include <uapi/linux/blktrace_api.h> |
| 8 | #include <linux/list.h> |
| 9 | |
| 10 | #if defined(CONFIG_BLK_DEV_IO_TRACE) |
| 11 | |
| 12 | #include <linux/sysfs.h> |
| 13 | |
| 14 | struct blk_trace { |
| 15 | int trace_state; |
| 16 | struct rchan *rchan; |
| 17 | unsigned long __percpu *sequence; |
| 18 | unsigned char __percpu *msg_data; |
| 19 | u16 act_mask; |
| 20 | u64 start_lba; |
| 21 | u64 end_lba; |
| 22 | u32 pid; |
| 23 | u32 dev; |
| 24 | struct dentry *dir; |
| 25 | struct dentry *dropped_file; |
| 26 | struct dentry *msg_file; |
| 27 | struct list_head running_list; |
| 28 | atomic_t dropped; |
| 29 | }; |
| 30 | |
| 31 | extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *); |
| 32 | extern void blk_trace_shutdown(struct request_queue *); |
| 33 | extern int do_blk_trace_setup(struct request_queue *q, char *name, |
| 34 | dev_t dev, struct block_device *bdev, |
| 35 | struct blk_user_trace_setup *buts); |
| 36 | extern __printf(2, 3) |
| 37 | void __trace_note_message(struct blk_trace *, const char *fmt, ...); |
| 38 | |
| 39 | /** |
| 40 | * blk_add_trace_msg - Add a (simple) message to the blktrace stream |
| 41 | * @q: queue the io is for |
| 42 | * @fmt: format to print message in |
| 43 | * args... Variable argument list for format |
| 44 | * |
| 45 | * Description: |
| 46 | * Records a (simple) message onto the blktrace stream. |
| 47 | * |
| 48 | * NOTE: BLK_TN_MAX_MSG characters are output at most. |
| 49 | * NOTE: Can not use 'static inline' due to presence of var args... |
| 50 | * |
| 51 | **/ |
| 52 | #define blk_add_trace_msg(q, fmt, ...) \ |
| 53 | do { \ |
| 54 | struct blk_trace *bt = (q)->blk_trace; \ |
| 55 | if (unlikely(bt)) \ |
| 56 | __trace_note_message(bt, fmt, ##__VA_ARGS__); \ |
| 57 | } while (0) |
| 58 | #define BLK_TN_MAX_MSG 128 |
| 59 | |
| 60 | static inline bool blk_trace_note_message_enabled(struct request_queue *q) |
| 61 | { |
| 62 | struct blk_trace *bt = q->blk_trace; |
| 63 | if (likely(!bt)) |
| 64 | return false; |
| 65 | return bt->act_mask & BLK_TC_NOTIFY; |
| 66 | } |
| 67 | |
| 68 | extern void blk_add_driver_data(struct request_queue *q, struct request *rq, |
| 69 | void *data, size_t len); |
| 70 | extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
| 71 | struct block_device *bdev, |
| 72 | char __user *arg); |
| 73 | extern int blk_trace_startstop(struct request_queue *q, int start); |
| 74 | extern int blk_trace_remove(struct request_queue *q); |
| 75 | extern void blk_trace_remove_sysfs(struct device *dev); |
| 76 | extern int blk_trace_init_sysfs(struct device *dev); |
| 77 | |
| 78 | extern struct attribute_group blk_trace_attr_group; |
| 79 | |
| 80 | #else /* !CONFIG_BLK_DEV_IO_TRACE */ |
| 81 | # define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY) |
| 82 | # define blk_trace_shutdown(q) do { } while (0) |
| 83 | # define do_blk_trace_setup(q, name, dev, bdev, buts) (-ENOTTY) |
| 84 | # define blk_add_driver_data(q, rq, data, len) do {} while (0) |
| 85 | # define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY) |
| 86 | # define blk_trace_startstop(q, start) (-ENOTTY) |
| 87 | # define blk_trace_remove(q) (-ENOTTY) |
| 88 | # define blk_add_trace_msg(q, fmt, ...) do { } while (0) |
| 89 | # define blk_trace_remove_sysfs(dev) do { } while (0) |
| 90 | # define blk_trace_note_message_enabled(q) (false) |
| 91 | static inline int blk_trace_init_sysfs(struct device *dev) |
| 92 | { |
| 93 | return 0; |
| 94 | } |
| 95 | |
| 96 | #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
| 97 | |
| 98 | #ifdef CONFIG_COMPAT |
| 99 | |
| 100 | struct compat_blk_user_trace_setup { |
| 101 | char name[BLKTRACE_BDEV_SIZE]; |
| 102 | u16 act_mask; |
| 103 | u32 buf_size; |
| 104 | u32 buf_nr; |
| 105 | compat_u64 start_lba; |
| 106 | compat_u64 end_lba; |
| 107 | u32 pid; |
| 108 | }; |
| 109 | #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup) |
| 110 | |
| 111 | #endif |
| 112 | |
| 113 | #if defined(CONFIG_EVENT_TRACING) && defined(CONFIG_BLOCK) |
| 114 | |
| 115 | static inline int blk_cmd_buf_len(struct request *rq) |
| 116 | { |
| 117 | return (rq->cmd_type == REQ_TYPE_BLOCK_PC) ? rq->cmd_len * 3 : 1; |
| 118 | } |
| 119 | |
| 120 | extern void blk_dump_cmd(char *buf, struct request *rq); |
| 121 | extern void blk_fill_rwbs(char *rwbs, u32 rw, int bytes); |
| 122 | |
| 123 | #endif /* CONFIG_EVENT_TRACING && CONFIG_BLOCK */ |
| 124 | |
| 125 | #endif |