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d332ce0918
This provides the infrastructure for schedulers to expose their internal state through debugfs. We add a list of queue attributes and a list of hctx attributes to struct elevator_type and wire them up when switching schedulers. Signed-off-by: Omar Sandoval <osandov@fb.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Add missing seq_file.h header in blk-mq-debugfs.h Signed-off-by: Jens Axboe <axboe@fb.com>
79 lines
2 KiB
C
79 lines
2 KiB
C
#ifndef INT_BLK_MQ_DEBUGFS_H
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#define INT_BLK_MQ_DEBUGFS_H
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#ifdef CONFIG_BLK_DEBUG_FS
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#include <linux/seq_file.h>
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struct blk_mq_debugfs_attr {
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const char *name;
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umode_t mode;
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int (*show)(void *, struct seq_file *);
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ssize_t (*write)(void *, const char __user *, size_t, loff_t *);
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/* Set either .show or .seq_ops. */
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const struct seq_operations *seq_ops;
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};
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int blk_mq_debugfs_register(struct request_queue *q);
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void blk_mq_debugfs_unregister(struct request_queue *q);
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int blk_mq_debugfs_register_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx);
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int blk_mq_debugfs_register_hctxs(struct request_queue *q);
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void blk_mq_debugfs_unregister_hctxs(struct request_queue *q);
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int blk_mq_debugfs_register_sched(struct request_queue *q);
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void blk_mq_debugfs_unregister_sched(struct request_queue *q);
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int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx);
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void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx);
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#else
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static inline int blk_mq_debugfs_register(struct request_queue *q)
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{
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return 0;
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}
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static inline void blk_mq_debugfs_unregister(struct request_queue *q)
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{
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}
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static inline int blk_mq_debugfs_register_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx)
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{
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return 0;
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}
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static inline void blk_mq_debugfs_unregister_hctx(struct blk_mq_hw_ctx *hctx)
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{
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}
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static inline int blk_mq_debugfs_register_hctxs(struct request_queue *q)
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{
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return 0;
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}
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static inline void blk_mq_debugfs_unregister_hctxs(struct request_queue *q)
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{
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}
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static inline int blk_mq_debugfs_register_sched(struct request_queue *q)
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{
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return 0;
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}
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static inline void blk_mq_debugfs_unregister_sched(struct request_queue *q)
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{
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}
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static inline int blk_mq_debugfs_register_sched_hctx(struct request_queue *q,
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struct blk_mq_hw_ctx *hctx)
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{
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return 0;
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}
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static inline void blk_mq_debugfs_unregister_sched_hctx(struct blk_mq_hw_ctx *hctx)
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{
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}
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#endif
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#endif
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