e3a2b3f931
For request_fn based devices, the block layer exports a 'nr_requests' file through sysfs to allow adjusting of queue depth on the fly. Currently this returns -EINVAL for blk-mq, since it's not wired up. Wire this up for blk-mq, so that it now also always dynamic adjustments of the allowed queue depth for any given block device managed by blk-mq. Signed-off-by: Jens Axboe <axboe@fb.com>
66 lines
1.8 KiB
C
66 lines
1.8 KiB
C
#ifndef INT_BLK_MQ_H
|
|
#define INT_BLK_MQ_H
|
|
|
|
struct blk_mq_tag_set;
|
|
|
|
struct blk_mq_ctx {
|
|
struct {
|
|
spinlock_t lock;
|
|
struct list_head rq_list;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
unsigned int cpu;
|
|
unsigned int index_hw;
|
|
|
|
unsigned int last_tag ____cacheline_aligned_in_smp;
|
|
|
|
/* incremented at dispatch time */
|
|
unsigned long rq_dispatched[2];
|
|
unsigned long rq_merged;
|
|
|
|
/* incremented at completion time */
|
|
unsigned long ____cacheline_aligned_in_smp rq_completed[2];
|
|
|
|
struct request_queue *queue;
|
|
struct kobject kobj;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
void __blk_mq_complete_request(struct request *rq);
|
|
void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
|
|
void blk_mq_init_flush(struct request_queue *q);
|
|
void blk_mq_drain_queue(struct request_queue *q);
|
|
void blk_mq_free_queue(struct request_queue *q);
|
|
void blk_mq_clone_flush_request(struct request *flush_rq,
|
|
struct request *orig_rq);
|
|
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
|
|
|
|
/*
|
|
* CPU hotplug helpers
|
|
*/
|
|
struct blk_mq_cpu_notifier;
|
|
void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
|
|
void (*fn)(void *, unsigned long, unsigned int),
|
|
void *data);
|
|
void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
|
|
void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
|
|
void blk_mq_cpu_init(void);
|
|
void blk_mq_enable_hotplug(void);
|
|
void blk_mq_disable_hotplug(void);
|
|
|
|
/*
|
|
* CPU -> queue mappings
|
|
*/
|
|
extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
|
|
extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
|
|
|
|
/*
|
|
* Basic implementation of sparser bitmap, allowing the user to spread
|
|
* the bits over more cachelines.
|
|
*/
|
|
struct blk_align_bitmap {
|
|
unsigned long word;
|
|
unsigned long depth;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
#endif
|