diff options
Diffstat (limited to 'block/blk-mq.h')
-rw-r--r-- | block/blk-mq.h | 384 |
1 files changed, 293 insertions, 91 deletions
diff --git a/block/blk-mq.h b/block/blk-mq.h index 32c62c64e6c2..f75a9ecfebde 100644 --- a/block/blk-mq.h +++ b/block/blk-mq.h @@ -2,8 +2,8 @@ #ifndef INT_BLK_MQ_H #define INT_BLK_MQ_H +#include <linux/blk-mq.h> #include "blk-stat.h" -#include "blk-mq-tag.h" struct blk_mq_tag_set; @@ -25,28 +25,32 @@ struct blk_mq_ctx { unsigned short index_hw[HCTX_MAX_TYPES]; struct blk_mq_hw_ctx *hctxs[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; +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 request_queue *, struct list_head *, bool); -void blk_mq_add_to_requeue_list(struct request *rq, bool at_head, - bool kick_requeue_list); +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); -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); +void blk_mq_put_rq_ref(struct request *rq); /* * Internal helpers for allocating/freeing the request map @@ -54,26 +58,11 @@ struct request *blk_mq_dequeue_from_ctx(struct blk_mq_hw_ctx *hctx, 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); - -/* Used by blk_insert_cloned_request() to issue request directly */ -blk_status_t blk_mq_request_issue_directly(struct request *rq, bool last); -void blk_mq_try_issue_list_directly(struct blk_mq_hw_ctx *hctx, - struct list_head *list); +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 @@ -90,30 +79,34 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue_type(struct request_queue * enum hctx_type type, unsigned int cpu) { - return q->queue_hw_ctx[q->tag_set->map[type].mq_map[cpu]]; + return xa_load(&q->hctx_table, 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 ctx - */ -static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, - unsigned int flags, - struct blk_mq_ctx *ctx) +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_HIPRI, poll must be enabled. + * The caller ensure that if REQ_POLLED, poll must be enabled. */ - if (flags & REQ_HIPRI) + if (opf & REQ_POLLED) type = HCTX_TYPE_POLL; - else if ((flags & REQ_OP_MASK) == REQ_OP_READ) + else if ((opf & REQ_OP_MASK) == REQ_OP_READ) type = HCTX_TYPE_READ; - - return ctx->hctxs[type]; + 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)]; } /* @@ -121,21 +114,17 @@ static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, */ 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); +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_release(struct request_queue *q); +void blk_mq_cancel_work_sync(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); -} +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) @@ -159,18 +148,81 @@ struct blk_mq_alloc_data { struct request_queue *q; blk_mq_req_flags_t flags; unsigned int shallow_depth; - unsigned int cmd_flags; + 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->flags & BLK_MQ_REQ_INTERNAL) + if (data->rq_flags & RQF_SCHED_TAGS) return data->hctx->sched_tags; - return data->hctx->tags; } @@ -184,47 +236,127 @@ 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]); +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 blk_mq_hw_ctx *hctx) +static inline void blk_mq_put_dispatch_budget(struct request_queue *q, + int budget_token) { - struct request_queue *q = hctx->queue; - if (q->mq_ops->put_budget) - q->mq_ops->put_budget(hctx); + q->mq_ops->put_budget(q, budget_token); } -static inline bool blk_mq_get_dispatch_budget(struct blk_mq_hw_ctx *hctx) +static inline int blk_mq_get_dispatch_budget(struct request_queue *q) { - struct request_queue *q = hctx->queue; - if (q->mq_ops->get_budget) - return q->mq_ops->get_budget(hctx); - return true; + 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_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); - } + 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 == -1 || rq->internal_tag == -1) + 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; @@ -235,7 +367,6 @@ static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap) /* * blk_mq_plug() - Get caller context plug - * @q: request queue * @bio : the bio being submitted by the caller context * * Plugging, by design, may delay the insertion of BIOs into the elevator in @@ -246,23 +377,94 @@ static inline void blk_mq_clear_mq_map(struct blk_mq_queue_map *qmap) * 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 the target request queue - * is for a zoned block device and the BIO to plug is a write operation. + * 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 request_queue *q, - struct bio *bio) +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. */ - if (!blk_queue_is_zoned(q) || !op_is_write(bio_op(bio))) - return current->plug; + return current->plug; +} - /* Zoned block device write operation case: do not plug the BIO */ - return NULL; +/* 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 |