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Jens Axboe320ae512013-10-24 09:20:05 +01001#ifndef INT_BLK_MQ_H
2#define INT_BLK_MQ_H
3
Christoph Hellwig24d2f902014-04-15 14:14:00 -06004struct blk_mq_tag_set;
5
Jens Axboe320ae512013-10-24 09:20:05 +01006struct blk_mq_ctx {
7 struct {
8 spinlock_t lock;
9 struct list_head rq_list;
10 } ____cacheline_aligned_in_smp;
11
12 unsigned int cpu;
13 unsigned int index_hw;
Jens Axboe320ae512013-10-24 09:20:05 +010014
Jens Axboe4bb659b2014-05-09 09:36:49 -060015 unsigned int last_tag ____cacheline_aligned_in_smp;
16
Jens Axboe320ae512013-10-24 09:20:05 +010017 /* incremented at dispatch time */
18 unsigned long rq_dispatched[2];
19 unsigned long rq_merged;
20
21 /* incremented at completion time */
22 unsigned long ____cacheline_aligned_in_smp rq_completed[2];
23
24 struct request_queue *queue;
25 struct kobject kobj;
Jens Axboe4bb659b2014-05-09 09:36:49 -060026} ____cacheline_aligned_in_smp;
Jens Axboe320ae512013-10-24 09:20:05 +010027
Jens Axboe320ae512013-10-24 09:20:05 +010028void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
Tejun Heo780db202014-07-01 10:31:13 -060029void blk_mq_freeze_queue(struct request_queue *q);
Ming Lei3edcc0c2013-12-26 21:31:38 +080030void blk_mq_free_queue(struct request_queue *q);
Jens Axboee3a2b3f2014-05-20 11:49:02 -060031int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
Jens Axboeaed3ea92014-12-22 14:04:42 -070032void blk_mq_wake_waiters(struct request_queue *q);
Jens Axboe320ae512013-10-24 09:20:05 +010033
34/*
35 * CPU hotplug helpers
36 */
37struct blk_mq_cpu_notifier;
38void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
Jens Axboee814e712014-05-21 13:59:08 -060039 int (*fn)(void *, unsigned long, unsigned int),
Jens Axboe320ae512013-10-24 09:20:05 +010040 void *data);
41void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
42void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
43void blk_mq_cpu_init(void);
Jens Axboe676141e2014-03-20 13:29:18 -060044void blk_mq_enable_hotplug(void);
45void blk_mq_disable_hotplug(void);
Jens Axboe320ae512013-10-24 09:20:05 +010046
47/*
48 * CPU -> queue mappings
49 */
Christoph Hellwig24d2f902014-04-15 14:14:00 -060050extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
Akinobu Mita57783222015-09-27 02:09:23 +090051extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
52 const struct cpumask *online_mask);
Jens Axboef14bbe72014-05-27 12:06:53 -060053extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
Jens Axboe320ae512013-10-24 09:20:05 +010054
Jens Axboee93ecf62014-05-19 09:17:48 -060055/*
Jens Axboe67aec142014-05-30 08:25:36 -060056 * sysfs helpers
57 */
58extern int blk_mq_sysfs_register(struct request_queue *q);
59extern void blk_mq_sysfs_unregister(struct request_queue *q);
Keith Busch868f2f02015-12-17 17:08:14 -070060extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
Jens Axboe67aec142014-05-30 08:25:36 -060061
Christoph Hellwig90415832014-09-22 10:21:48 -060062extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
63
Ming Leie09aae72015-01-29 20:17:27 +080064void blk_mq_release(struct request_queue *q);
65
Jens Axboe67aec142014-05-30 08:25:36 -060066/*
Jens Axboee93ecf62014-05-19 09:17:48 -060067 * Basic implementation of sparser bitmap, allowing the user to spread
68 * the bits over more cachelines.
69 */
70struct blk_align_bitmap {
71 unsigned long word;
72 unsigned long depth;
73} ____cacheline_aligned_in_smp;
74
Ming Lei1aecfe42014-06-01 00:43:36 +080075static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
76 unsigned int cpu)
77{
78 return per_cpu_ptr(q->queue_ctx, cpu);
79}
80
81/*
82 * This assumes per-cpu software queueing queues. They could be per-node
83 * as well, for instance. For now this is hardcoded as-is. Note that we don't
84 * care about preemption, since we know the ctx's are persistent. This does
85 * mean that we can't rely on ctx always matching the currently running CPU.
86 */
87static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
88{
89 return __blk_mq_get_ctx(q, get_cpu());
90}
91
92static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
93{
94 put_cpu();
95}
96
Ming Leicb96a422014-06-01 00:43:37 +080097struct blk_mq_alloc_data {
98 /* input parameter */
99 struct request_queue *q;
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100100 unsigned int flags;
Ming Leicb96a422014-06-01 00:43:37 +0800101
102 /* input & output parameter */
103 struct blk_mq_ctx *ctx;
104 struct blk_mq_hw_ctx *hctx;
105};
106
107static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100108 struct request_queue *q, unsigned int flags,
109 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
Ming Leicb96a422014-06-01 00:43:37 +0800110{
111 data->q = q;
Christoph Hellwig6f3b0e82015-11-26 09:13:05 +0100112 data->flags = flags;
Ming Leicb96a422014-06-01 00:43:37 +0800113 data->ctx = ctx;
114 data->hctx = hctx;
115}
116
Ming Lei19c66e52014-12-03 19:38:04 +0800117static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
118{
119 return hctx->nr_ctx && hctx->tags;
120}
121
Jens Axboe320ae512013-10-24 09:20:05 +0100122#endif