180 lines · c
1/* SPDX-License-Identifier: GPL-2.0 */2#ifndef RQ_QOS_H3#define RQ_QOS_H4 5#include <linux/kernel.h>6#include <linux/blkdev.h>7#include <linux/blk_types.h>8#include <linux/atomic.h>9#include <linux/wait.h>10#include <linux/blk-mq.h>11 12#include "blk-mq-debugfs.h"13 14struct blk_mq_debugfs_attr;15 16enum rq_qos_id {17 RQ_QOS_WBT,18 RQ_QOS_LATENCY,19 RQ_QOS_COST,20};21 22struct rq_wait {23 wait_queue_head_t wait;24 atomic_t inflight;25};26 27struct rq_qos {28 const struct rq_qos_ops *ops;29 struct gendisk *disk;30 enum rq_qos_id id;31 struct rq_qos *next;32#ifdef CONFIG_BLK_DEBUG_FS33 struct dentry *debugfs_dir;34#endif35};36 37struct rq_qos_ops {38 void (*throttle)(struct rq_qos *, struct bio *);39 void (*track)(struct rq_qos *, struct request *, struct bio *);40 void (*merge)(struct rq_qos *, struct request *, struct bio *);41 void (*issue)(struct rq_qos *, struct request *);42 void (*requeue)(struct rq_qos *, struct request *);43 void (*done)(struct rq_qos *, struct request *);44 void (*done_bio)(struct rq_qos *, struct bio *);45 void (*cleanup)(struct rq_qos *, struct bio *);46 void (*queue_depth_changed)(struct rq_qos *);47 void (*exit)(struct rq_qos *);48 const struct blk_mq_debugfs_attr *debugfs_attrs;49};50 51struct rq_depth {52 unsigned int max_depth;53 54 int scale_step;55 bool scaled_max;56 57 unsigned int queue_depth;58 unsigned int default_depth;59};60 61static inline struct rq_qos *rq_qos_id(struct request_queue *q,62 enum rq_qos_id id)63{64 struct rq_qos *rqos;65 for (rqos = q->rq_qos; rqos; rqos = rqos->next) {66 if (rqos->id == id)67 break;68 }69 return rqos;70}71 72static inline struct rq_qos *wbt_rq_qos(struct request_queue *q)73{74 return rq_qos_id(q, RQ_QOS_WBT);75}76 77static inline struct rq_qos *iolat_rq_qos(struct request_queue *q)78{79 return rq_qos_id(q, RQ_QOS_LATENCY);80}81 82static inline void rq_wait_init(struct rq_wait *rq_wait)83{84 atomic_set(&rq_wait->inflight, 0);85 init_waitqueue_head(&rq_wait->wait);86}87 88int rq_qos_add(struct rq_qos *rqos, struct gendisk *disk, enum rq_qos_id id,89 const struct rq_qos_ops *ops);90void rq_qos_del(struct rq_qos *rqos);91 92typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data);93typedef void (cleanup_cb_t)(struct rq_wait *rqw, void *private_data);94 95void rq_qos_wait(struct rq_wait *rqw, void *private_data,96 acquire_inflight_cb_t *acquire_inflight_cb,97 cleanup_cb_t *cleanup_cb);98bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit);99bool rq_depth_scale_up(struct rq_depth *rqd);100bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle);101bool rq_depth_calc_max_depth(struct rq_depth *rqd);102 103void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio);104void __rq_qos_done(struct rq_qos *rqos, struct request *rq);105void __rq_qos_issue(struct rq_qos *rqos, struct request *rq);106void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq);107void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio);108void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio);109void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio);110void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio);111void __rq_qos_queue_depth_changed(struct rq_qos *rqos);112 113static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio)114{115 if (q->rq_qos)116 __rq_qos_cleanup(q->rq_qos, bio);117}118 119static inline void rq_qos_done(struct request_queue *q, struct request *rq)120{121 if (q->rq_qos && !blk_rq_is_passthrough(rq))122 __rq_qos_done(q->rq_qos, rq);123}124 125static inline void rq_qos_issue(struct request_queue *q, struct request *rq)126{127 if (q->rq_qos)128 __rq_qos_issue(q->rq_qos, rq);129}130 131static inline void rq_qos_requeue(struct request_queue *q, struct request *rq)132{133 if (q->rq_qos)134 __rq_qos_requeue(q->rq_qos, rq);135}136 137static inline void rq_qos_done_bio(struct bio *bio)138{139 if (bio->bi_bdev && (bio_flagged(bio, BIO_QOS_THROTTLED) ||140 bio_flagged(bio, BIO_QOS_MERGED))) {141 struct request_queue *q = bdev_get_queue(bio->bi_bdev);142 if (q->rq_qos)143 __rq_qos_done_bio(q->rq_qos, bio);144 }145}146 147static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio)148{149 if (q->rq_qos) {150 bio_set_flag(bio, BIO_QOS_THROTTLED);151 __rq_qos_throttle(q->rq_qos, bio);152 }153}154 155static inline void rq_qos_track(struct request_queue *q, struct request *rq,156 struct bio *bio)157{158 if (q->rq_qos)159 __rq_qos_track(q->rq_qos, rq, bio);160}161 162static inline void rq_qos_merge(struct request_queue *q, struct request *rq,163 struct bio *bio)164{165 if (q->rq_qos) {166 bio_set_flag(bio, BIO_QOS_MERGED);167 __rq_qos_merge(q->rq_qos, rq, bio);168 }169}170 171static inline void rq_qos_queue_depth_changed(struct request_queue *q)172{173 if (q->rq_qos)174 __rq_qos_queue_depth_changed(q->rq_qos);175}176 177void rq_qos_exit(struct request_queue *);178 179#endif180