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 126