1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/blkdev.h>
6 #include <linux/relay.h>
7 #include <linux/compat.h>
8 #include <uapi/linux/blktrace_api.h>
9 #include <linux/list.h>
11 #if defined(CONFIG_BLK_DEV_IO_TRACE)
13 #include <linux/sysfs.h>
18 unsigned long __percpu *sequence;
19 unsigned char __percpu *msg_data;
26 struct dentry *dropped_file;
27 struct dentry *msg_file;
28 struct list_head running_list;
34 extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *);
35 extern void blk_trace_shutdown(struct request_queue *);
37 void __trace_note_message(struct blk_trace *, struct blkcg *blkcg, const char *fmt, ...);
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
46 * Records a (simple) message onto the blktrace stream.
48 * NOTE: BLK_TN_MAX_MSG characters are output at most.
49 * NOTE: Can not use 'static inline' due to presence of var args...
52 #define blk_add_cgroup_trace_msg(q, cg, fmt, ...) \
54 struct blk_trace *bt; \
57 bt = rcu_dereference((q)->blk_trace); \
59 __trace_note_message(bt, cg, fmt, ##__VA_ARGS__);\
62 #define blk_add_trace_msg(q, fmt, ...) \
63 blk_add_cgroup_trace_msg(q, NULL, fmt, ##__VA_ARGS__)
64 #define BLK_TN_MAX_MSG 128
66 static inline bool blk_trace_note_message_enabled(struct request_queue *q)
72 bt = rcu_dereference(q->blk_trace);
73 ret = bt && (bt->act_mask & BLK_TC_NOTIFY);
78 extern void blk_add_driver_data(struct request *rq, void *data, size_t len);
79 extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev,
80 struct block_device *bdev,
82 extern int blk_trace_startstop(struct request_queue *q, int start);
83 extern int blk_trace_remove(struct request_queue *q);
84 extern void blk_trace_remove_sysfs(struct device *dev);
85 extern int blk_trace_init_sysfs(struct device *dev);
87 extern struct attribute_group blk_trace_attr_group;
89 #else /* !CONFIG_BLK_DEV_IO_TRACE */
90 # define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY)
91 # define blk_trace_shutdown(q) do { } while (0)
92 # define blk_add_driver_data(rq, data, len) do {} while (0)
93 # define blk_trace_setup(q, name, dev, bdev, arg) (-ENOTTY)
94 # define blk_trace_startstop(q, start) (-ENOTTY)
95 # define blk_trace_remove(q) (-ENOTTY)
96 # define blk_add_trace_msg(q, fmt, ...) do { } while (0)
97 # define blk_add_cgroup_trace_msg(q, cg, fmt, ...) do { } while (0)
98 # define blk_trace_remove_sysfs(dev) do { } while (0)
99 # define blk_trace_note_message_enabled(q) (false)
100 static inline int blk_trace_init_sysfs(struct device *dev)
105 #endif /* CONFIG_BLK_DEV_IO_TRACE */
109 struct compat_blk_user_trace_setup {
110 char name[BLKTRACE_BDEV_SIZE];
114 compat_u64 start_lba;
118 #define BLKTRACESETUP32 _IOWR(0x12, 115, struct compat_blk_user_trace_setup)
122 extern void blk_fill_rwbs(char *rwbs, unsigned int op);
124 static inline sector_t blk_rq_trace_sector(struct request *rq)
127 * Tracing should ignore starting sector for passthrough requests and
128 * requests where starting sector didn't get set.
130 if (blk_rq_is_passthrough(rq) || blk_rq_pos(rq) == (sector_t)-1)
132 return blk_rq_pos(rq);
135 static inline unsigned int blk_rq_trace_nr_sectors(struct request *rq)
137 return blk_rq_is_passthrough(rq) ? 0 : blk_rq_sectors(rq);