Gitiles
Code Review Sign In
gerrit-public.fairphone.software / kernel / msm-4.19 / ee38053fcf5d401e8b5c05bd6a40b687a875f02a / . / block / blk-mq-tag.h
blob: 61deab0b5a5a565c1214ad305cac52f0dde7fb3d [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +0100[diff] [blame]1/* SPDX-License-Identifier: GPL-2.0 */
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]2#ifndef INT_BLK_MQ_TAG_H
3#define INT_BLK_MQ_TAG_H
4
Jens Axboee93ecf62014-05-19 09:17:48 -0600[diff] [blame]5#include "blk-mq.h"
6
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]7/*
8 * Tag address space map.
9 */
10struct blk_mq_tags {
11 unsigned int nr_tags;
12 unsigned int nr_reserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]13
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]14 atomic_t active_queues;
15
Omar Sandoval88459642016-09-17 08:38:44 -0600[diff] [blame]16 struct sbitmap_queue bitmap_tags;
17 struct sbitmap_queue breserved_tags;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]18
19 struct request **rqs;
Jens Axboe2af8cbe2017-01-13 14:39:30 -0700[diff] [blame]20 struct request **static_rqs;
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600[diff] [blame]21 struct list_head page_list;
22};
23
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]24
Shaohua Li24391c02015-01-23 14:18:00 -0700[diff] [blame]25extern struct blk_mq_tags *blk_mq_init_tags(unsigned int nr_tags, unsigned int reserved_tags, int node, int alloc_policy);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]26extern void blk_mq_free_tags(struct blk_mq_tags *tags);
27
Ming Leicb96a422014-06-01 00:43:37 +0800[diff] [blame]28extern unsigned int blk_mq_get_tag(struct blk_mq_alloc_data *data);
Jens Axboe49411152017-01-13 08:09:05 -0700[diff] [blame]29extern void blk_mq_put_tag(struct blk_mq_hw_ctx *hctx, struct blk_mq_tags *tags,
30 struct blk_mq_ctx *ctx, unsigned int tag);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]31extern bool blk_mq_has_free_tags(struct blk_mq_tags *tags);
Jens Axboe70f36b62017-01-19 10:59:07 -0700[diff] [blame]32extern int blk_mq_tag_update_depth(struct blk_mq_hw_ctx *hctx,
33 struct blk_mq_tags **tags,
34 unsigned int depth, bool can_grow);
Jens Axboeaed3ea92014-12-22 14:04:42 -0700[diff] [blame]35extern void blk_mq_tag_wakeup_all(struct blk_mq_tags *tags, bool);
Christoph Hellwig0bf6cd52015-09-27 21:01:51 +0200[diff] [blame]36void blk_mq_queue_tag_busy_iter(struct request_queue *q, busy_iter_fn *fn,
37 void *priv);
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]38
Omar Sandoval88459642016-09-17 08:38:44 -0600[diff] [blame]39static inline struct sbq_wait_state *bt_wait_ptr(struct sbitmap_queue *bt,
40 struct blk_mq_hw_ctx *hctx)
41{
42 if (!hctx)
43 return &bt->ws[0];
44 return sbq_wait_ptr(bt, &hctx->wait_index);
45}
46
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]47enum {
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]48 BLK_MQ_TAG_FAIL = -1U,
Jens Axboe5385fa42017-10-01 01:26:21 -0600[diff] [blame]49 BLK_MQ_TAG_MIN = 1,
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]50 BLK_MQ_TAG_MAX = BLK_MQ_TAG_FAIL - 1,
51};
52
Jens Axboe0d2602c2014-05-13 15:10:52 -0600[diff] [blame]53extern bool __blk_mq_tag_busy(struct blk_mq_hw_ctx *);
54extern void __blk_mq_tag_idle(struct blk_mq_hw_ctx *);
55
56static inline bool blk_mq_tag_busy(struct blk_mq_hw_ctx *hctx)
57{
58 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
59 return false;
60
61 return __blk_mq_tag_busy(hctx);
62}
63
64static inline void blk_mq_tag_idle(struct blk_mq_hw_ctx *hctx)
65{
66 if (!(hctx->flags & BLK_MQ_F_TAG_SHARED))
67 return;
68
69 __blk_mq_tag_idle(hctx);
70}
71
Ming Lei0048b482015-08-09 03:41:51 -0400[diff] [blame]72/*
73 * This helper should only be used for flush request to share tag
74 * with the request cloned from, and both the two requests can't be
75 * in flight at the same time. The caller has to make sure the tag
76 * can't be freed.
77 */
78static inline void blk_mq_tag_set_rq(struct blk_mq_hw_ctx *hctx,
79 unsigned int tag, struct request *rq)
80{
81 hctx->tags->rqs[tag] = rq;
82}
83
Sagi Grimberg415b8062017-02-27 10:04:39 -0700[diff] [blame]84static inline bool blk_mq_tag_is_reserved(struct blk_mq_tags *tags,
85 unsigned int tag)
86{
87 return tag < tags->nr_reserved_tags;
88}
89
Jens Axboe320ae512013-10-24 09:20:05 +0100[diff] [blame]90#endif