tty: serial_core: convert uart_close to use tty_port_close
[linux-2.6-block.git] / block / blk-mq.h
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1#ifndef INT_BLK_MQ_H
2#define INT_BLK_MQ_H
3
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4struct blk_mq_tag_set;
5
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6struct 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;
320ae51f 14
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15 unsigned int last_tag ____cacheline_aligned_in_smp;
16
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17 /* 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;
4bb659b1 26} ____cacheline_aligned_in_smp;
320ae51f 27
320ae51f 28void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
780db207 29void blk_mq_freeze_queue(struct request_queue *q);
3edcc0ce 30void blk_mq_free_queue(struct request_queue *q);
e3a2b3f9 31int blk_mq_update_nr_requests(struct request_queue *q, unsigned int nr);
aed3ea94 32void blk_mq_wake_waiters(struct request_queue *q);
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33
34/*
35 * CPU hotplug helpers
36 */
37struct blk_mq_cpu_notifier;
38void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
e814e71b 39 int (*fn)(void *, unsigned long, unsigned int),
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40 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);
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44void blk_mq_enable_hotplug(void);
45void blk_mq_disable_hotplug(void);
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46
47/*
48 * CPU -> queue mappings
49 */
24d2f903 50extern unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set);
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51extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues,
52 const struct cpumask *online_mask);
f14bbe77 53extern int blk_mq_hw_queue_to_node(unsigned int *map, unsigned int);
320ae51f 54
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55/*
56 * sysfs helpers
57 */
58extern int blk_mq_sysfs_register(struct request_queue *q);
59extern void blk_mq_sysfs_unregister(struct request_queue *q);
868f2f0b 60extern void blk_mq_hctx_kobj_init(struct blk_mq_hw_ctx *hctx);
67aec14c 61
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62extern void blk_mq_rq_timed_out(struct request *req, bool reserved);
63
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64void blk_mq_release(struct request_queue *q);
65
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66/*
67 * 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
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75static 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
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97struct blk_mq_alloc_data {
98 /* input parameter */
99 struct request_queue *q;
6f3b0e8b 100 unsigned int flags;
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101
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,
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108 struct request_queue *q, unsigned int flags,
109 struct blk_mq_ctx *ctx, struct blk_mq_hw_ctx *hctx)
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110{
111 data->q = q;
6f3b0e8b 112 data->flags = flags;
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113 data->ctx = ctx;
114 data->hctx = hctx;
115}
116
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117static inline bool blk_mq_hw_queue_mapped(struct blk_mq_hw_ctx *hctx)
118{
119 return hctx->nr_ctx && hctx->tags;
120}
121
320ae51f 122#endif