linux-yocto - Yocto Linux Embedded kernel

Age	Commit message (Expand)	Author
2012-07-31	xfs: Convert to new freezing code	Jan Kara
2012-05-14	xfs: clean up xfs_bit.h includes	Dave Chinner
2012-05-14	xfs: move xfsagino_t to xfs_types.h	Dave Chinner
2012-03-14	xfs: clean up minor sparse warnings	Dave Chinner
2012-01-03	vfs: mnt_drop_write_file()	Al Viro
2012-01-03	switch a bunch of places to mnt_want_write_file()	Al Viro
2011-08-12	xfs: remove subdirectories	Christoph Hellwig

/* 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_ctx - State for a software queue facing the submitting CPUs */ struct blk_mq_ctx { struct { spinlock_t lock; struct list_head rq_list; } ____cacheline_aligned_in_smp; unsigned int cpu; unsigned int index_hw; /* 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 kobject kobj; } ____cacheline_aligned_in_smp; void blk_mq_freeze_queue(struct request_queue *q); 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 blk_mq_hw_ctx **hctx, bool wait); 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); /* Used by blk_insert_cloned_request() to issue request directly */ blk_status_t blk_mq_request_issue_directly(struct request *rq); /* * CPU -> queue mappings */ extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int); static inline struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *q, int cpu) { return q->queue_hw_ctx[q->mq_map[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; /* 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; } void blk_mq_in_flight(struct request_queue *q, struct hd_struct *part, unsigned int inflight[2]); 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) { struct blk_mq_hw_ctx *hctx; if (rq->tag == -1 || rq->internal_tag == -1) return; hctx = blk_mq_map_queue(rq->q, rq->mq_ctx->cpu); __blk_mq_put_driver_tag(hctx, rq); } #endif