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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
Christoph Hellwig30a91cb2014-02-10 03:24:38 -080028void __blk_mq_complete_request(struct request *rq);
Jens Axboe320ae512013-10-24 09:20:05 +010029void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
30void blk_mq_init_flush(struct request_queue *q);
Tejun Heo780db202014-07-01 10:31:13 -060031void blk_mq_freeze_queue(struct request_queue *q);
Ming Lei3edcc0c2013-12-26 21:31:38 +080032void blk_mq_free_queue(struct request_queue *q);
Christoph Hellwig8727af42014-04-14 10:30:08 +020033void blk_mq_clone_flush_request(struct request *flush_rq,
34 struct request *orig_rq);
Jens Axboee3a2b3f2014-05-20 11:49:02 -060035int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
Jens Axboe320ae512013-10-24 09:20:05 +010036
37/*
38 * CPU hotplug helpers
39 */
40struct blk_mq_cpu_notifier;
41void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
Jens Axboee814e712014-05-21 13:59:08 -060042 int (*fn)(void *, unsigned long, unsigned int),
Jens Axboe320ae512013-10-24 09:20:05 +010043 void *data);
44void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
45void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
46void blk_mq_cpu_init(void);
Jens Axboe676141e2014-03-20 13:29:18 -060047void blk_mq_enable_hotplug(void);
48void blk_mq_disable_hotplug(void);
Jens Axboe320ae512013-10-24 09:20:05 +010049
50/*
51 * CPU -> queue mappings
52 */
Christoph Hellwig24d2f902014-04-15 14:14:00 -060053extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
Jens Axboe320ae512013-10-24 09:20:05 +010054extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
Jens Axboef14bbe72014-05-27 12:06:53 -060055extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
Jens Axboe320ae512013-10-24 09:20:05 +010056
Jens Axboee93ecf62014-05-19 09:17:48 -060057/*
Jens Axboe67aec142014-05-30 08:25:36 -060058 * sysfs helpers
59 */
60extern int blk_mq_sysfs_register(struct request_queue *q);
61extern void blk_mq_sysfs_unregister(struct request_queue *q);
62
63/*
Jens Axboee93ecf62014-05-19 09:17:48 -060064 * Basic implementation of sparser bitmap, allowing the user to spread
65 * the bits over more cachelines.
66 */
67struct blk_align_bitmap {
68 unsigned long word;
69 unsigned long depth;
70} ____cacheline_aligned_in_smp;
71
Ming Lei1aecfe42014-06-01 00:43:36 +080072static inline struct blk_mq_ctx *__blk_mq_get_ctx(struct request_queue *q,
73 unsigned int cpu)
74{
75 return per_cpu_ptr(q->queue_ctx, cpu);
76}
77
78/*
79 * This assumes per-cpu software queueing queues. They could be per-node
80 * as well, for instance. For now this is hardcoded as-is. Note that we don't
81 * care about preemption, since we know the ctx's are persistent. This does
82 * mean that we can't rely on ctx always matching the currently running CPU.
83 */
84static inline struct blk_mq_ctx *blk_mq_get_ctx(struct request_queue *q)
85{
86 return __blk_mq_get_ctx(q, get_cpu());
87}
88
89static inline void blk_mq_put_ctx(struct blk_mq_ctx *ctx)
90{
91 put_cpu();
92}
93
Ming Leicb96a422014-06-01 00:43:37 +080094struct blk_mq_alloc_data {
95 /* input parameter */
96 struct request_queue *q;
97 gfp_t gfp;
98 bool reserved;
99
100 /* input & output parameter */
101 struct blk_mq_ctx *ctx;
102 struct blk_mq_hw_ctx *hctx;
103};
104
105static inline void blk_mq_set_alloc_data(struct blk_mq_alloc_data *data,
106 struct request_queue *q, gfp_t gfp, bool reserved,
107 struct blk_mq_ctx *ctx,
108 struct blk_mq_hw_ctx *hctx)
109{
110 data->q = q;
111 data->gfp = gfp;
112 data->reserved = reserved;
113 data->ctx = ctx;
114 data->hctx = hctx;
115}
116
Jens Axboe320ae512013-10-24 09:20:05 +0100117#endif