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