253 lines
6.8 KiB
C
253 lines
6.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef INT_BLK_MQ_H
|
|
#define INT_BLK_MQ_H
|
|
|
|
#include "blk-stat.h"
|
|
#include "blk-mq-tag.h"
|
|
|
|
struct blk_mq_tag_set;
|
|
|
|
struct blk_mq_ctxs {
|
|
struct kobject kobj;
|
|
struct blk_mq_ctx __percpu *queue_ctx;
|
|
};
|
|
|
|
/**
|
|
* struct blk_mq_ctx - State for a software queue facing the submitting CPUs
|
|
*/
|
|
struct blk_mq_ctx {
|
|
struct {
|
|
spinlock_t lock;
|
|
struct list_head rq_lists[HCTX_MAX_TYPES];
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
unsigned int cpu;
|
|
unsigned short index_hw[HCTX_MAX_TYPES];
|
|
|
|
/* 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 blk_mq_ctxs *ctxs;
|
|
struct kobject kobj;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
void blk_mq_free_queue(struct request_queue *q);
|
|
int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
|
|
void blk_mq_wake_waiters(struct request_queue *q);
|
|
bool blk_mq_dispatch_rq_list(struct request_queue *, struct list_head *, bool);
|
|
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
|
|
bool blk_mq_get_driver_tag(struct request *rq);
|
|
struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
|
|
struct blk_mq_ctx *start);
|
|
|
|
/*
|
|
* Internal helpers for allocating/freeing the request map
|
|
*/
|
|
void blk_mq_free_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
|
|
unsigned int hctx_idx);
|
|
void blk_mq_free_rq_map(struct blk_mq_tags *tags);
|
|
struct blk_mq_tags *blk_mq_alloc_rq_map(struct blk_mq_tag_set *set,
|
|
unsigned int hctx_idx,
|
|
unsigned int nr_tags,
|
|
unsigned int reserved_tags);
|
|
int blk_mq_alloc_rqs(struct blk_mq_tag_set *set, struct blk_mq_tags *tags,
|
|
unsigned int hctx_idx, unsigned int depth);
|
|
|
|
/*
|
|
* Internal helpers for request insertion into sw queues
|
|
*/
|
|
void __blk_mq_insert_request(struct blk_mq_hw_ctx *hctx, struct request *rq,
|
|
bool at_head);
|
|
void blk_mq_request_bypass_insert(struct request *rq, bool run_queue);
|
|
void blk_mq_insert_requests(struct blk_mq_hw_ctx *hctx, struct blk_mq_ctx *ctx,
|
|
struct list_head *list);
|
|
|
|
blk_status_t blk_mq_try_issue_directly(struct blk_mq_hw_ctx *hctx,
|
|
struct request *rq,
|
|
blk_qc_t *cookie,
|
|
bool bypass, bool last);
|
|
void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx,
|
|
struct list_head *list);
|
|
|
|
/*
|
|
* CPU -> queue mappings
|
|
*/
|
|
extern int blk_mq_hw_queue_to_node(struct blk_mq_queue_map *qmap, unsigned int);
|
|
|
|
/*
|
|
* blk_mq_map_queue_type() - map (hctx_type,cpu) to hardware queue
|
|
* @q: request queue
|
|
* @type: the hctx type index
|
|
* @cpu: CPU
|
|
*/
|
|
static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue *q,
|
|
enum hctx_type type,
|
|
unsigned int cpu)
|
|
{
|
|
return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]];
|
|
}
|
|
|
|
/*
|
|
* blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
|
|
* @q: request queue
|
|
* @flags: request command flags
|
|
* @cpu: CPU
|
|
*/
|
|
static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
|
|
unsigned int flags,
|
|
unsigned int cpu)
|
|
{
|
|
enum hctx_type type = HCTX_TYPE_DEFAULT;
|
|
|
|
if ((flags & REQ_HIPRI) &&
|
|
q->tag_set->nr_maps > HCTX_TYPE_POLL &&
|
|
q->tag_set->map[HCTX_TYPE_POLL].nr_queues &&
|
|
test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
|
|
type = HCTX_TYPE_POLL;
|
|
|
|
else if (((flags & REQ_OP_MASK) == REQ_OP_READ) &&
|
|
q->tag_set->nr_maps > HCTX_TYPE_READ &&
|
|
q->tag_set->map[HCTX_TYPE_READ].nr_queues)
|
|
type = HCTX_TYPE_READ;
|
|
|
|
return blk_mq_map_queue_type(q, type, cpu);
|
|
}
|
|
|
|
/*
|
|
* sysfs helpers
|
|
*/
|
|
extern void blk_mq_sysfs_init(struct request_queue *q);
|
|
extern void blk_mq_sysfs_deinit(struct request_queue *q);
|
|
extern int __blk_mq_register_dev(struct device *dev, struct request_queue *q);
|
|
extern int blk_mq_sysfs_register(struct request_queue *q);
|
|
extern void blk_mq_sysfs_unregister(struct request_queue *q);
|
|
extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
|
|
|
|
void blk_mq_release(struct request_queue *q);
|
|
|
|
/**
|
|
* blk_mq_rq_state() - read the current MQ_RQ_* state of a request
|
|
* @rq: target request.
|
|
*/
|
|
static inline enum mq_rq_state blk_mq_rq_state(struct request *rq)
|
|
{
|
|
return READ_ONCE(rq->state);
|
|
}
|
|
|
|
static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
|
|
unsigned int cpu)
|
|
{
|
|
return per_cpu_ptr(q->queue_ctx, cpu);
|
|
}
|
|
|
|
/*
|
|
* This assumes per-cpu software queueing queues. They could be per-node
|
|
* as well, for instance. For now this is hardcoded as-is. Note that we don't
|
|
* care about preemption, since we know the ctx's are persistent. This does
|
|
* mean that we can't rely on ctx always matching the currently running CPU.
|
|
*/
|
|
static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
|
|
{
|
|
return __blk_mq_get_ctx(q, get_cpu());
|
|
}
|
|
|
|
static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
|
|
{
|
|
put_cpu();
|
|
}
|
|
|
|
struct blk_mq_alloc_data {
|
|
/* input parameter */
|
|
struct request_queue *q;
|
|
blk_mq_req_flags_t flags;
|
|
unsigned int shallow_depth;
|
|
unsigned int cmd_flags;
|
|
|
|
/* input & output parameter */
|
|
struct blk_mq_ctx *ctx;
|
|
struct blk_mq_hw_ctx *hctx;
|
|
};
|
|
|
|
static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
|
|
{
|
|
if (data->flags & BLK_MQ_REQ_INTERNAL)
|
|
return data->hctx->sched_tags;
|
|
|
|
return data->hctx->tags;
|
|
}
|
|
|
|
static inline bool blk_mq_hctx_stopped(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
return test_bit(BLK_MQ_S_STOPPED, &hctx->state);
|
|
}
|
|
|
|
static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
return hctx->nr_ctx && hctx->tags;
|
|
}
|
|
|
|
unsigned int blk_mq_in_flight(struct request_queue *q, struct hd_struct *part);
|
|
void blk_mq_in_flight_rw(struct request_queue *q, struct hd_struct *part,
|
|
unsigned int inflight[2]);
|
|
|
|
static inline void blk_mq_put_dispatch_budget(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
struct request_queue *q = hctx->queue;
|
|
|
|
if (q->mq_ops->put_budget)
|
|
q->mq_ops->put_budget(hctx);
|
|
}
|
|
|
|
static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
struct request_queue *q = hctx->queue;
|
|
|
|
if (q->mq_ops->get_budget)
|
|
return q->mq_ops->get_budget(hctx);
|
|
return true;
|
|
}
|
|
|
|
static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
|
|
struct request *rq)
|
|
{
|
|
blk_mq_put_tag(hctx, hctx->tags, rq->mq_ctx, rq->tag);
|
|
rq->tag = -1;
|
|
|
|
if (rq->rq_flags & RQF_MQ_INFLIGHT) {
|
|
rq->rq_flags &= ~RQF_MQ_INFLIGHT;
|
|
atomic_dec(&hctx->nr_active);
|
|
}
|
|
}
|
|
|
|
static inline void blk_mq_put_driver_tag_hctx(struct blk_mq_hw_ctx *hctx,
|
|
struct request *rq)
|
|
{
|
|
if (rq->tag == -1 || rq->internal_tag == -1)
|
|
return;
|
|
|
|
__blk_mq_put_driver_tag(hctx, rq);
|
|
}
|
|
|
|
static inline void blk_mq_put_driver_tag(struct request *rq)
|
|
{
|
|
if (rq->tag == -1 || rq->internal_tag == -1)
|
|
return;
|
|
|
|
__blk_mq_put_driver_tag(rq->mq_hctx, rq);
|
|
}
|
|
|
|
static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu)
|
|
qmap->mq_map[cpu] = 0;
|
|
}
|
|
|
|
#endif
|