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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f253b86b4a
This reverts commit 7681bfeecc
.
Conflicts:
include/linux/genhd.h
It has numerous issues with the cleanup path and non-elevator
devices. Revert it for now so we can come up with a clean
version without rushing things.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
173 lines
4.6 KiB
C
173 lines
4.6 KiB
C
#ifndef BLK_INTERNAL_H
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#define BLK_INTERNAL_H
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/* Amount of time in which a process may batch requests */
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#define BLK_BATCH_TIME (HZ/50UL)
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/* Number of requests a "batching" process may submit */
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#define BLK_BATCH_REQ 32
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extern struct kmem_cache *blk_requestq_cachep;
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extern struct kobj_type blk_queue_ktype;
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void init_request_from_bio(struct request *req, struct bio *bio);
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void blk_rq_bio_prep(struct request_queue *q, struct request *rq,
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struct bio *bio);
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int blk_rq_append_bio(struct request_queue *q, struct request *rq,
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struct bio *bio);
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void blk_dequeue_request(struct request *rq);
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void __blk_queue_free_tags(struct request_queue *q);
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void blk_unplug_work(struct work_struct *work);
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void blk_unplug_timeout(unsigned long data);
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void blk_rq_timed_out_timer(unsigned long data);
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void blk_delete_timer(struct request *);
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void blk_add_timer(struct request *);
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void __generic_unplug_device(struct request_queue *);
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/*
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* Internal atomic flags for request handling
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*/
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enum rq_atomic_flags {
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REQ_ATOM_COMPLETE = 0,
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};
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/*
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* EH timer and IO completion will both attempt to 'grab' the request, make
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* sure that only one of them suceeds
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*/
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static inline int blk_mark_rq_complete(struct request *rq)
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{
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return test_and_set_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
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}
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static inline void blk_clear_rq_complete(struct request *rq)
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{
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clear_bit(REQ_ATOM_COMPLETE, &rq->atomic_flags);
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}
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/*
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* Internal elevator interface
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*/
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#define ELV_ON_HASH(rq) (!hlist_unhashed(&(rq)->hash))
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struct request *blk_do_flush(struct request_queue *q, struct request *rq);
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static inline struct request *__elv_next_request(struct request_queue *q)
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{
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struct request *rq;
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while (1) {
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while (!list_empty(&q->queue_head)) {
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rq = list_entry_rq(q->queue_head.next);
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if (!(rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) ||
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rq == &q->flush_rq)
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return rq;
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rq = blk_do_flush(q, rq);
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if (rq)
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return rq;
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}
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if (!q->elevator->ops->elevator_dispatch_fn(q, 0))
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return NULL;
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}
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}
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static inline void elv_activate_rq(struct request_queue *q, struct request *rq)
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{
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struct elevator_queue *e = q->elevator;
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if (e->ops->elevator_activate_req_fn)
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e->ops->elevator_activate_req_fn(q, rq);
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}
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static inline void elv_deactivate_rq(struct request_queue *q, struct request *rq)
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{
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struct elevator_queue *e = q->elevator;
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if (e->ops->elevator_deactivate_req_fn)
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e->ops->elevator_deactivate_req_fn(q, rq);
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}
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#ifdef CONFIG_FAIL_IO_TIMEOUT
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int blk_should_fake_timeout(struct request_queue *);
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ssize_t part_timeout_show(struct device *, struct device_attribute *, char *);
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ssize_t part_timeout_store(struct device *, struct device_attribute *,
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const char *, size_t);
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#else
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static inline int blk_should_fake_timeout(struct request_queue *q)
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{
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return 0;
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}
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#endif
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struct io_context *current_io_context(gfp_t gfp_flags, int node);
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int ll_back_merge_fn(struct request_queue *q, struct request *req,
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struct bio *bio);
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int ll_front_merge_fn(struct request_queue *q, struct request *req,
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struct bio *bio);
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int attempt_back_merge(struct request_queue *q, struct request *rq);
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int attempt_front_merge(struct request_queue *q, struct request *rq);
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void blk_recalc_rq_segments(struct request *rq);
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void blk_rq_set_mixed_merge(struct request *rq);
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void blk_queue_congestion_threshold(struct request_queue *q);
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int blk_dev_init(void);
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void elv_quiesce_start(struct request_queue *q);
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void elv_quiesce_end(struct request_queue *q);
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/*
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* Return the threshold (number of used requests) at which the queue is
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* considered to be congested. It include a little hysteresis to keep the
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* context switch rate down.
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*/
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static inline int queue_congestion_on_threshold(struct request_queue *q)
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{
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return q->nr_congestion_on;
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}
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/*
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* The threshold at which a queue is considered to be uncongested
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*/
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static inline int queue_congestion_off_threshold(struct request_queue *q)
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{
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return q->nr_congestion_off;
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}
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static inline int blk_cpu_to_group(int cpu)
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{
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int group = NR_CPUS;
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#ifdef CONFIG_SCHED_MC
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const struct cpumask *mask = cpu_coregroup_mask(cpu);
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group = cpumask_first(mask);
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#elif defined(CONFIG_SCHED_SMT)
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group = cpumask_first(topology_thread_cpumask(cpu));
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#else
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return cpu;
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#endif
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if (likely(group < NR_CPUS))
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return group;
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return cpu;
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}
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/*
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* Contribute to IO statistics IFF:
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*
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* a) it's attached to a gendisk, and
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* b) the queue had IO stats enabled when this request was started, and
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* c) it's a file system request or a discard request
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*/
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static inline int blk_do_io_stat(struct request *rq)
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{
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return rq->rq_disk &&
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(rq->cmd_flags & REQ_IO_STAT) &&
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(rq->cmd_type == REQ_TYPE_FS ||
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(rq->cmd_flags & REQ_DISCARD));
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}
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#endif
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