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67aec14ce8
Currently blk-mq registers all the hardware queues in sysfs, regardless of whether it uses them (e.g. they have CPU mappings) or not. The unused hardware queues lack the cpux/ directories, and the other sysfs entries (like active, pending, etc) are all zeroes. Change this so that sysfs correctly reflects the current mappings of the hardware queues. Signed-off-by: Jens Axboe <axboe@fb.com>
72 lines
2 KiB
C
72 lines
2 KiB
C
#ifndef INT_BLK_MQ_H
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#define INT_BLK_MQ_H
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struct blk_mq_tag_set;
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struct blk_mq_ctx {
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struct {
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spinlock_t lock;
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struct list_head rq_list;
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} ____cacheline_aligned_in_smp;
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unsigned int cpu;
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unsigned int index_hw;
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unsigned int last_tag ____cacheline_aligned_in_smp;
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/* incremented at dispatch time */
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unsigned long rq_dispatched[2];
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unsigned long rq_merged;
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/* incremented at completion time */
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unsigned long ____cacheline_aligned_in_smp rq_completed[2];
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struct request_queue *queue;
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struct kobject kobj;
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} ____cacheline_aligned_in_smp;
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void __blk_mq_complete_request(struct request *rq);
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void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
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void blk_mq_init_flush(struct request_queue *q);
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void blk_mq_drain_queue(struct request_queue *q);
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void blk_mq_free_queue(struct request_queue *q);
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void blk_mq_clone_flush_request(struct request *flush_rq,
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struct request *orig_rq);
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int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
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/*
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* CPU hotplug helpers
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*/
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struct blk_mq_cpu_notifier;
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void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
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int (*fn)(void *, unsigned long, unsigned int),
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void *data);
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void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
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void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
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void blk_mq_cpu_init(void);
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void blk_mq_enable_hotplug(void);
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void blk_mq_disable_hotplug(void);
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/*
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* CPU -> queue mappings
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*/
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extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
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extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
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extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
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/*
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* sysfs helpers
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*/
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extern int blk_mq_sysfs_register(struct request_queue *q);
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extern void blk_mq_sysfs_unregister(struct request_queue *q);
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/*
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* Basic implementation of sparser bitmap, allowing the user to spread
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* the bits over more cachelines.
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*/
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struct blk_align_bitmap {
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unsigned long word;
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unsigned long depth;
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} ____cacheline_aligned_in_smp;
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#endif
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