mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-27 13:05:03 +08:00
217b613a53
Now we update driver tags request table in blk_mq_get_driver_tag(), so the driver that support queue_rqs() have to update that inflight table by itself. Move it to blk_mq_start_request(), which is a better place where we setup the deadline for request timeout check. And it's just where the request becomes inflight. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20230913151616.3164338-5-chengming.zhou@linux.dev Signed-off-by: Jens Axboe <axboe@kernel.dk>
471 lines
13 KiB
C
471 lines
13 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef INT_BLK_MQ_H
|
|
#define INT_BLK_MQ_H
|
|
|
|
#include <linux/blk-mq.h>
|
|
#include "blk-stat.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];
|
|
struct blk_mq_hw_ctx *hctxs[HCTX_MAX_TYPES];
|
|
|
|
struct request_queue *queue;
|
|
struct blk_mq_ctxs *ctxs;
|
|
struct kobject kobj;
|
|
} ____cacheline_aligned_in_smp;
|
|
|
|
enum {
|
|
BLK_MQ_NO_TAG = -1U,
|
|
BLK_MQ_TAG_MIN = 1,
|
|
BLK_MQ_TAG_MAX = BLK_MQ_NO_TAG - 1,
|
|
};
|
|
|
|
typedef unsigned int __bitwise blk_insert_t;
|
|
#define BLK_MQ_INSERT_AT_HEAD ((__force blk_insert_t)0x01)
|
|
|
|
void blk_mq_submit_bio(struct bio *bio);
|
|
int blk_mq_poll(struct request_queue *q, blk_qc_t cookie, struct io_comp_batch *iob,
|
|
unsigned int flags);
|
|
void blk_mq_exit_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 blk_mq_hw_ctx *hctx, struct list_head *,
|
|
unsigned int);
|
|
void blk_mq_flush_busy_ctxs(struct blk_mq_hw_ctx *hctx, struct list_head *list);
|
|
struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx,
|
|
struct blk_mq_ctx *start);
|
|
void blk_mq_put_rq_ref(struct request *rq);
|
|
|
|
/*
|
|
* 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_map_and_rqs(struct blk_mq_tag_set *set,
|
|
unsigned int hctx_idx, unsigned int depth);
|
|
void blk_mq_free_map_and_rqs(struct blk_mq_tag_set *set,
|
|
struct blk_mq_tags *tags,
|
|
unsigned int hctx_idx);
|
|
|
|
/*
|
|
* 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 xa_load(&q->hctx_table, q->tag_set->map[type].mq_map[cpu]);
|
|
}
|
|
|
|
static inline enum hctx_type blk_mq_get_hctx_type(blk_opf_t opf)
|
|
{
|
|
enum hctx_type type = HCTX_TYPE_DEFAULT;
|
|
|
|
/*
|
|
* The caller ensure that if REQ_POLLED, poll must be enabled.
|
|
*/
|
|
if (opf & REQ_POLLED)
|
|
type = HCTX_TYPE_POLL;
|
|
else if ((opf & REQ_OP_MASK) == REQ_OP_READ)
|
|
type = HCTX_TYPE_READ;
|
|
return type;
|
|
}
|
|
|
|
/*
|
|
* blk_mq_map_queue() - map (cmd_flags,type) to hardware queue
|
|
* @q: request queue
|
|
* @opf: operation type (REQ_OP_*) and flags (e.g. REQ_POLLED).
|
|
* @ctx: software queue cpu ctx
|
|
*/
|
|
static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q,
|
|
blk_opf_t opf,
|
|
struct blk_mq_ctx *ctx)
|
|
{
|
|
return ctx->hctxs[blk_mq_get_hctx_type(opf)];
|
|
}
|
|
|
|
/*
|
|
* sysfs helpers
|
|
*/
|
|
extern void blk_mq_sysfs_init(struct request_queue *q);
|
|
extern void blk_mq_sysfs_deinit(struct request_queue *q);
|
|
int blk_mq_sysfs_register(struct gendisk *disk);
|
|
void blk_mq_sysfs_unregister(struct gendisk *disk);
|
|
int blk_mq_sysfs_register_hctxs(struct request_queue *q);
|
|
void blk_mq_sysfs_unregister_hctxs(struct request_queue *q);
|
|
extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
|
|
void blk_mq_free_plug_rqs(struct blk_plug *plug);
|
|
void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
|
|
|
|
void blk_mq_cancel_work_sync(struct request_queue *q);
|
|
|
|
void blk_mq_release(struct request_queue *q);
|
|
|
|
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, raw_smp_processor_id());
|
|
}
|
|
|
|
struct blk_mq_alloc_data {
|
|
/* input parameter */
|
|
struct request_queue *q;
|
|
blk_mq_req_flags_t flags;
|
|
unsigned int shallow_depth;
|
|
blk_opf_t cmd_flags;
|
|
req_flags_t rq_flags;
|
|
|
|
/* allocate multiple requests/tags in one go */
|
|
unsigned int nr_tags;
|
|
struct request **cached_rq;
|
|
|
|
/* input & output parameter */
|
|
struct blk_mq_ctx *ctx;
|
|
struct blk_mq_hw_ctx *hctx;
|
|
};
|
|
|
|
struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags,
|
|
unsigned int reserved_tags, int node, int alloc_policy);
|
|
void blk_mq_free_tags(struct blk_mq_tags *tags);
|
|
int blk_mq_init_bitmaps(struct sbitmap_queue *bitmap_tags,
|
|
struct sbitmap_queue *breserved_tags, unsigned int queue_depth,
|
|
unsigned int reserved, int node, int alloc_policy);
|
|
|
|
unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
|
|
unsigned long blk_mq_get_tags(struct blk_mq_alloc_data *data, int nr_tags,
|
|
unsigned int *offset);
|
|
void blk_mq_put_tag(struct blk_mq_tags *tags, struct blk_mq_ctx *ctx,
|
|
unsigned int tag);
|
|
void blk_mq_put_tags(struct blk_mq_tags *tags, int *tag_array, int nr_tags);
|
|
int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
|
|
struct blk_mq_tags **tags, unsigned int depth, bool can_grow);
|
|
void blk_mq_tag_resize_shared_tags(struct blk_mq_tag_set *set,
|
|
unsigned int size);
|
|
void blk_mq_tag_update_sched_shared_tags(struct request_queue *q);
|
|
|
|
void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
|
|
void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_tag_iter_fn *fn,
|
|
void *priv);
|
|
void blk_mq_all_tag_iter(struct blk_mq_tags *tags, busy_tag_iter_fn *fn,
|
|
void *priv);
|
|
|
|
static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
|
|
struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (!hctx)
|
|
return &bt->ws[0];
|
|
return sbq_wait_ptr(bt, &hctx->wait_index);
|
|
}
|
|
|
|
void __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
|
|
void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
|
|
|
|
static inline void blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_tag_busy(hctx);
|
|
}
|
|
|
|
static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_tag_idle(hctx);
|
|
}
|
|
|
|
static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
|
|
unsigned int tag)
|
|
{
|
|
return tag < tags->nr_reserved_tags;
|
|
}
|
|
|
|
static inline bool blk_mq_is_shared_tags(unsigned int flags)
|
|
{
|
|
return flags & BLK_MQ_F_TAG_HCTX_SHARED;
|
|
}
|
|
|
|
static inline struct blk_mq_tags *blk_mq_tags_from_data(struct blk_mq_alloc_data *data)
|
|
{
|
|
if (data->rq_flags & RQF_SCHED_TAGS)
|
|
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 block_device *part);
|
|
void blk_mq_in_flight_rw(struct request_queue *q, struct block_device *part,
|
|
unsigned int inflight[2]);
|
|
|
|
static inline void blk_mq_put_dispatch_budget(struct request_queue *q,
|
|
int budget_token)
|
|
{
|
|
if (q->mq_ops->put_budget)
|
|
q->mq_ops->put_budget(q, budget_token);
|
|
}
|
|
|
|
static inline int blk_mq_get_dispatch_budget(struct request_queue *q)
|
|
{
|
|
if (q->mq_ops->get_budget)
|
|
return q->mq_ops->get_budget(q);
|
|
return 0;
|
|
}
|
|
|
|
static inline void blk_mq_set_rq_budget_token(struct request *rq, int token)
|
|
{
|
|
if (token < 0)
|
|
return;
|
|
|
|
if (rq->q->mq_ops->set_rq_budget_token)
|
|
rq->q->mq_ops->set_rq_budget_token(rq, token);
|
|
}
|
|
|
|
static inline int blk_mq_get_rq_budget_token(struct request *rq)
|
|
{
|
|
if (rq->q->mq_ops->get_rq_budget_token)
|
|
return rq->q->mq_ops->get_rq_budget_token(rq);
|
|
return -1;
|
|
}
|
|
|
|
static inline void __blk_mq_add_active_requests(struct blk_mq_hw_ctx *hctx,
|
|
int val)
|
|
{
|
|
if (blk_mq_is_shared_tags(hctx->flags))
|
|
atomic_add(val, &hctx->queue->nr_active_requests_shared_tags);
|
|
else
|
|
atomic_add(val, &hctx->nr_active);
|
|
}
|
|
|
|
static inline void __blk_mq_inc_active_requests(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
__blk_mq_add_active_requests(hctx, 1);
|
|
}
|
|
|
|
static inline void __blk_mq_sub_active_requests(struct blk_mq_hw_ctx *hctx,
|
|
int val)
|
|
{
|
|
if (blk_mq_is_shared_tags(hctx->flags))
|
|
atomic_sub(val, &hctx->queue->nr_active_requests_shared_tags);
|
|
else
|
|
atomic_sub(val, &hctx->nr_active);
|
|
}
|
|
|
|
static inline void __blk_mq_dec_active_requests(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
__blk_mq_sub_active_requests(hctx, 1);
|
|
}
|
|
|
|
static inline void blk_mq_add_active_requests(struct blk_mq_hw_ctx *hctx,
|
|
int val)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_add_active_requests(hctx, val);
|
|
}
|
|
|
|
static inline void blk_mq_inc_active_requests(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_inc_active_requests(hctx);
|
|
}
|
|
|
|
static inline void blk_mq_sub_active_requests(struct blk_mq_hw_ctx *hctx,
|
|
int val)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_sub_active_requests(hctx, val);
|
|
}
|
|
|
|
static inline void blk_mq_dec_active_requests(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED)
|
|
__blk_mq_dec_active_requests(hctx);
|
|
}
|
|
|
|
static inline int __blk_mq_active_requests(struct blk_mq_hw_ctx *hctx)
|
|
{
|
|
if (blk_mq_is_shared_tags(hctx->flags))
|
|
return atomic_read(&hctx->queue->nr_active_requests_shared_tags);
|
|
return atomic_read(&hctx->nr_active);
|
|
}
|
|
static inline void __blk_mq_put_driver_tag(struct blk_mq_hw_ctx *hctx,
|
|
struct request *rq)
|
|
{
|
|
blk_mq_dec_active_requests(hctx);
|
|
blk_mq_put_tag(hctx->tags, rq->mq_ctx, rq->tag);
|
|
rq->tag = BLK_MQ_NO_TAG;
|
|
}
|
|
|
|
static inline void blk_mq_put_driver_tag(struct request *rq)
|
|
{
|
|
if (rq->tag == BLK_MQ_NO_TAG || rq->internal_tag == BLK_MQ_NO_TAG)
|
|
return;
|
|
|
|
__blk_mq_put_driver_tag(rq->mq_hctx, rq);
|
|
}
|
|
|
|
bool __blk_mq_alloc_driver_tag(struct request *rq);
|
|
|
|
static inline bool blk_mq_get_driver_tag(struct request *rq)
|
|
{
|
|
if (rq->tag == BLK_MQ_NO_TAG && !__blk_mq_alloc_driver_tag(rq))
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* blk_mq_plug() - Get caller context plug
|
|
* @bio : the bio being submitted by the caller context
|
|
*
|
|
* Plugging, by design, may delay the insertion of BIOs into the elevator in
|
|
* order to increase BIO merging opportunities. This however can cause BIO
|
|
* insertion order to change from the order in which submit_bio() is being
|
|
* executed in the case of multiple contexts concurrently issuing BIOs to a
|
|
* device, even if these context are synchronized to tightly control BIO issuing
|
|
* order. While this is not a problem with regular block devices, this ordering
|
|
* change can cause write BIO failures with zoned block devices as these
|
|
* require sequential write patterns to zones. Prevent this from happening by
|
|
* ignoring the plug state of a BIO issuing context if it is for a zoned block
|
|
* device and the BIO to plug is a write operation.
|
|
*
|
|
* Return current->plug if the bio can be plugged and NULL otherwise
|
|
*/
|
|
static inline struct blk_plug *blk_mq_plug( struct bio *bio)
|
|
{
|
|
/* Zoned block device write operation case: do not plug the BIO */
|
|
if (IS_ENABLED(CONFIG_BLK_DEV_ZONED) &&
|
|
bdev_op_is_zoned_write(bio->bi_bdev, bio_op(bio)))
|
|
return NULL;
|
|
|
|
/*
|
|
* For regular block devices or read operations, use the context plug
|
|
* which may be NULL if blk_start_plug() was not executed.
|
|
*/
|
|
return current->plug;
|
|
}
|
|
|
|
/* Free all requests on the list */
|
|
static inline void blk_mq_free_requests(struct list_head *list)
|
|
{
|
|
while (!list_empty(list)) {
|
|
struct request *rq = list_entry_rq(list->next);
|
|
|
|
list_del_init(&rq->queuelist);
|
|
blk_mq_free_request(rq);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* For shared tag users, we track the number of currently active users
|
|
* and attempt to provide a fair share of the tag depth for each of them.
|
|
*/
|
|
static inline bool hctx_may_queue(struct blk_mq_hw_ctx *hctx,
|
|
struct sbitmap_queue *bt)
|
|
{
|
|
unsigned int depth, users;
|
|
|
|
if (!hctx || !(hctx->flags & BLK_MQ_F_TAG_QUEUE_SHARED))
|
|
return true;
|
|
|
|
/*
|
|
* Don't try dividing an ant
|
|
*/
|
|
if (bt->sb.depth == 1)
|
|
return true;
|
|
|
|
if (blk_mq_is_shared_tags(hctx->flags)) {
|
|
struct request_queue *q = hctx->queue;
|
|
|
|
if (!test_bit(QUEUE_FLAG_HCTX_ACTIVE, &q->queue_flags))
|
|
return true;
|
|
} else {
|
|
if (!test_bit(BLK_MQ_S_TAG_ACTIVE, &hctx->state))
|
|
return true;
|
|
}
|
|
|
|
users = READ_ONCE(hctx->tags->active_queues);
|
|
if (!users)
|
|
return true;
|
|
|
|
/*
|
|
* Allow at least some tags
|
|
*/
|
|
depth = max((bt->sb.depth + users - 1) / users, 4U);
|
|
return __blk_mq_active_requests(hctx) < depth;
|
|
}
|
|
|
|
/* run the code block in @dispatch_ops with rcu/srcu read lock held */
|
|
#define __blk_mq_run_dispatch_ops(q, check_sleep, dispatch_ops) \
|
|
do { \
|
|
if ((q)->tag_set->flags & BLK_MQ_F_BLOCKING) { \
|
|
struct blk_mq_tag_set *__tag_set = (q)->tag_set; \
|
|
int srcu_idx; \
|
|
\
|
|
might_sleep_if(check_sleep); \
|
|
srcu_idx = srcu_read_lock(__tag_set->srcu); \
|
|
(dispatch_ops); \
|
|
srcu_read_unlock(__tag_set->srcu, srcu_idx); \
|
|
} else { \
|
|
rcu_read_lock(); \
|
|
(dispatch_ops); \
|
|
rcu_read_unlock(); \
|
|
} \
|
|
} while (0)
|
|
|
|
#define blk_mq_run_dispatch_ops(q, dispatch_ops) \
|
|
__blk_mq_run_dispatch_ops(q, true, dispatch_ops) \
|
|
|
|
#endif
|