forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
219 lines
5.3 KiB
219 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
#ifndef RQ_QOS_H |
|
#define RQ_QOS_H |
|
|
|
#include <linux/kernel.h> |
|
#include <linux/blkdev.h> |
|
#include <linux/blk_types.h> |
|
#include <linux/atomic.h> |
|
#include <linux/wait.h> |
|
#include <linux/blk-mq.h> |
|
|
|
#include "blk-mq-debugfs.h" |
|
|
|
struct blk_mq_debugfs_attr; |
|
|
|
enum rq_qos_id { |
|
RQ_QOS_WBT, |
|
RQ_QOS_LATENCY, |
|
RQ_QOS_COST, |
|
RQ_QOS_IOPRIO, |
|
}; |
|
|
|
struct rq_wait { |
|
wait_queue_head_t wait; |
|
atomic_t inflight; |
|
}; |
|
|
|
struct rq_qos { |
|
struct rq_qos_ops *ops; |
|
struct request_queue *q; |
|
enum rq_qos_id id; |
|
struct rq_qos *next; |
|
#ifdef CONFIG_BLK_DEBUG_FS |
|
struct dentry *debugfs_dir; |
|
#endif |
|
}; |
|
|
|
struct rq_qos_ops { |
|
void (*throttle)(struct rq_qos *, struct bio *); |
|
void (*track)(struct rq_qos *, struct request *, struct bio *); |
|
void (*merge)(struct rq_qos *, struct request *, struct bio *); |
|
void (*issue)(struct rq_qos *, struct request *); |
|
void (*requeue)(struct rq_qos *, struct request *); |
|
void (*done)(struct rq_qos *, struct request *); |
|
void (*done_bio)(struct rq_qos *, struct bio *); |
|
void (*cleanup)(struct rq_qos *, struct bio *); |
|
void (*queue_depth_changed)(struct rq_qos *); |
|
void (*exit)(struct rq_qos *); |
|
const struct blk_mq_debugfs_attr *debugfs_attrs; |
|
}; |
|
|
|
struct rq_depth { |
|
unsigned int max_depth; |
|
|
|
int scale_step; |
|
bool scaled_max; |
|
|
|
unsigned int queue_depth; |
|
unsigned int default_depth; |
|
}; |
|
|
|
static inline struct rq_qos *rq_qos_id(struct request_queue *q, |
|
enum rq_qos_id id) |
|
{ |
|
struct rq_qos *rqos; |
|
for (rqos = q->rq_qos; rqos; rqos = rqos->next) { |
|
if (rqos->id == id) |
|
break; |
|
} |
|
return rqos; |
|
} |
|
|
|
static inline struct rq_qos *wbt_rq_qos(struct request_queue *q) |
|
{ |
|
return rq_qos_id(q, RQ_QOS_WBT); |
|
} |
|
|
|
static inline struct rq_qos *blkcg_rq_qos(struct request_queue *q) |
|
{ |
|
return rq_qos_id(q, RQ_QOS_LATENCY); |
|
} |
|
|
|
static inline void rq_wait_init(struct rq_wait *rq_wait) |
|
{ |
|
atomic_set(&rq_wait->inflight, 0); |
|
init_waitqueue_head(&rq_wait->wait); |
|
} |
|
|
|
static inline void rq_qos_add(struct request_queue *q, struct rq_qos *rqos) |
|
{ |
|
/* |
|
* No IO can be in-flight when adding rqos, so freeze queue, which |
|
* is fine since we only support rq_qos for blk-mq queue. |
|
* |
|
* Reuse ->queue_lock for protecting against other concurrent |
|
* rq_qos adding/deleting |
|
*/ |
|
blk_mq_freeze_queue(q); |
|
|
|
spin_lock_irq(&q->queue_lock); |
|
rqos->next = q->rq_qos; |
|
q->rq_qos = rqos; |
|
spin_unlock_irq(&q->queue_lock); |
|
|
|
blk_mq_unfreeze_queue(q); |
|
|
|
if (rqos->ops->debugfs_attrs) |
|
blk_mq_debugfs_register_rqos(rqos); |
|
} |
|
|
|
static inline void rq_qos_del(struct request_queue *q, struct rq_qos *rqos) |
|
{ |
|
struct rq_qos **cur; |
|
|
|
/* |
|
* See comment in rq_qos_add() about freezing queue & using |
|
* ->queue_lock. |
|
*/ |
|
blk_mq_freeze_queue(q); |
|
|
|
spin_lock_irq(&q->queue_lock); |
|
for (cur = &q->rq_qos; *cur; cur = &(*cur)->next) { |
|
if (*cur == rqos) { |
|
*cur = rqos->next; |
|
break; |
|
} |
|
} |
|
spin_unlock_irq(&q->queue_lock); |
|
|
|
blk_mq_unfreeze_queue(q); |
|
|
|
blk_mq_debugfs_unregister_rqos(rqos); |
|
} |
|
|
|
typedef bool (acquire_inflight_cb_t)(struct rq_wait *rqw, void *private_data); |
|
typedef void (cleanup_cb_t)(struct rq_wait *rqw, void *private_data); |
|
|
|
void rq_qos_wait(struct rq_wait *rqw, void *private_data, |
|
acquire_inflight_cb_t *acquire_inflight_cb, |
|
cleanup_cb_t *cleanup_cb); |
|
bool rq_wait_inc_below(struct rq_wait *rq_wait, unsigned int limit); |
|
bool rq_depth_scale_up(struct rq_depth *rqd); |
|
bool rq_depth_scale_down(struct rq_depth *rqd, bool hard_throttle); |
|
bool rq_depth_calc_max_depth(struct rq_depth *rqd); |
|
|
|
void __rq_qos_cleanup(struct rq_qos *rqos, struct bio *bio); |
|
void __rq_qos_done(struct rq_qos *rqos, struct request *rq); |
|
void __rq_qos_issue(struct rq_qos *rqos, struct request *rq); |
|
void __rq_qos_requeue(struct rq_qos *rqos, struct request *rq); |
|
void __rq_qos_throttle(struct rq_qos *rqos, struct bio *bio); |
|
void __rq_qos_track(struct rq_qos *rqos, struct request *rq, struct bio *bio); |
|
void __rq_qos_merge(struct rq_qos *rqos, struct request *rq, struct bio *bio); |
|
void __rq_qos_done_bio(struct rq_qos *rqos, struct bio *bio); |
|
void __rq_qos_queue_depth_changed(struct rq_qos *rqos); |
|
|
|
static inline void rq_qos_cleanup(struct request_queue *q, struct bio *bio) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_cleanup(q->rq_qos, bio); |
|
} |
|
|
|
static inline void rq_qos_done(struct request_queue *q, struct request *rq) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_done(q->rq_qos, rq); |
|
} |
|
|
|
static inline void rq_qos_issue(struct request_queue *q, struct request *rq) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_issue(q->rq_qos, rq); |
|
} |
|
|
|
static inline void rq_qos_requeue(struct request_queue *q, struct request *rq) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_requeue(q->rq_qos, rq); |
|
} |
|
|
|
static inline void rq_qos_done_bio(struct request_queue *q, struct bio *bio) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_done_bio(q->rq_qos, bio); |
|
} |
|
|
|
static inline void rq_qos_throttle(struct request_queue *q, struct bio *bio) |
|
{ |
|
/* |
|
* BIO_TRACKED lets controllers know that a bio went through the |
|
* normal rq_qos path. |
|
*/ |
|
bio_set_flag(bio, BIO_TRACKED); |
|
if (q->rq_qos) |
|
__rq_qos_throttle(q->rq_qos, bio); |
|
} |
|
|
|
static inline void rq_qos_track(struct request_queue *q, struct request *rq, |
|
struct bio *bio) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_track(q->rq_qos, rq, bio); |
|
} |
|
|
|
static inline void rq_qos_merge(struct request_queue *q, struct request *rq, |
|
struct bio *bio) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_merge(q->rq_qos, rq, bio); |
|
} |
|
|
|
static inline void rq_qos_queue_depth_changed(struct request_queue *q) |
|
{ |
|
if (q->rq_qos) |
|
__rq_qos_queue_depth_changed(q->rq_qos); |
|
} |
|
|
|
void rq_qos_exit(struct request_queue *); |
|
|
|
#endif
|
|
|