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Jens Axboe320ae512013-10-24 09:20:05 +01001#ifndef BLK_MQ_H
2#define BLK_MQ_H
3
4#include <linux/blkdev.h>
5
6struct blk_mq_tags;
Ming Leif70ced02014-09-25 23:23:47 +08007struct blk_flush_queue;
Jens Axboe320ae512013-10-24 09:20:05 +01008
9struct blk_mq_cpu_notifier {
10 struct list_head list;
11 void *data;
Jens Axboee814e712014-05-21 13:59:08 -060012 int (*notify)(void *data, unsigned long action, unsigned int cpu);
Jens Axboe320ae512013-10-24 09:20:05 +010013};
14
Jens Axboe1429d7c2014-05-19 09:23:55 -060015struct blk_mq_ctxmap {
16 unsigned int map_size;
17 unsigned int bits_per_word;
18 struct blk_align_bitmap *map;
19};
20
Jens Axboe320ae512013-10-24 09:20:05 +010021struct blk_mq_hw_ctx {
22 struct {
23 spinlock_t lock;
24 struct list_head dispatch;
25 } ____cacheline_aligned_in_smp;
26
27 unsigned long state; /* BLK_MQ_S_* flags */
Christoph Hellwig70f4db62014-04-16 10:48:08 -060028 struct delayed_work run_work;
29 struct delayed_work delay_work;
Jens Axboee4043dc2014-04-09 10:18:23 -060030 cpumask_var_t cpumask;
Jens Axboe506e9312014-05-07 10:26:44 -060031 int next_cpu;
32 int next_cpu_batch;
Jens Axboe320ae512013-10-24 09:20:05 +010033
34 unsigned long flags; /* BLK_MQ_F_* flags */
35
36 struct request_queue *queue;
Ming Leif70ced02014-09-25 23:23:47 +080037 struct blk_flush_queue *fq;
Jens Axboe320ae512013-10-24 09:20:05 +010038
39 void *driver_data;
40
Jens Axboe1429d7c2014-05-19 09:23:55 -060041 struct blk_mq_ctxmap ctx_map;
42
Jens Axboe4bb659b2014-05-09 09:36:49 -060043 unsigned int nr_ctx;
44 struct blk_mq_ctx **ctxs;
45
Alexander Gordeev8537b122014-06-17 22:12:35 -070046 atomic_t wait_index;
Jens Axboe320ae512013-10-24 09:20:05 +010047
Jens Axboe320ae512013-10-24 09:20:05 +010048 struct blk_mq_tags *tags;
49
50 unsigned long queued;
51 unsigned long run;
52#define BLK_MQ_MAX_DISPATCH_ORDER 10
53 unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
54
Jens Axboe320ae512013-10-24 09:20:05 +010055 unsigned int numa_node;
Jens Axboe17ded322015-01-07 10:44:04 -070056 unsigned int queue_num;
Jens Axboe320ae512013-10-24 09:20:05 +010057
Jens Axboe0d2602c2014-05-13 15:10:52 -060058 atomic_t nr_active;
59
Jens Axboe320ae512013-10-24 09:20:05 +010060 struct blk_mq_cpu_notifier cpu_notifier;
61 struct kobject kobj;
62};
63
Christoph Hellwig24d2f902014-04-15 14:14:00 -060064struct blk_mq_tag_set {
Jens Axboe320ae512013-10-24 09:20:05 +010065 struct blk_mq_ops *ops;
66 unsigned int nr_hw_queues;
Jens Axboee3a2b3f2014-05-20 11:49:02 -060067 unsigned int queue_depth; /* max hw supported */
Jens Axboe320ae512013-10-24 09:20:05 +010068 unsigned int reserved_tags;
69 unsigned int cmd_size; /* per-request extra data */
70 int numa_node;
71 unsigned int timeout;
72 unsigned int flags; /* BLK_MQ_F_* */
Christoph Hellwig24d2f902014-04-15 14:14:00 -060073 void *driver_data;
74
75 struct blk_mq_tags **tags;
Jens Axboe0d2602c2014-05-13 15:10:52 -060076
77 struct mutex tag_list_lock;
78 struct list_head tag_list;
Jens Axboe320ae512013-10-24 09:20:05 +010079};
80
Jens Axboe74c45052014-10-29 11:14:52 -060081struct blk_mq_queue_data {
82 struct request *rq;
83 struct list_head *list;
84 bool last;
85};
86
87typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, const struct blk_mq_queue_data *);
Jens Axboe320ae512013-10-24 09:20:05 +010088typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
Christoph Hellwig0152fb62014-09-13 16:40:13 -070089typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
Jens Axboe320ae512013-10-24 09:20:05 +010090typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
91typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
Christoph Hellwig24d2f902014-04-15 14:14:00 -060092typedef int (init_request_fn)(void *, struct request *, unsigned int,
93 unsigned int, unsigned int);
94typedef void (exit_request_fn)(void *, struct request *, unsigned int,
95 unsigned int);
Jens Axboe320ae512013-10-24 09:20:05 +010096
Christoph Hellwig81481eb2014-09-13 16:40:11 -070097typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
98 bool);
99
Jens Axboe320ae512013-10-24 09:20:05 +0100100struct blk_mq_ops {
101 /*
102 * Queue request
103 */
104 queue_rq_fn *queue_rq;
105
106 /*
107 * Map to specific hardware queue
108 */
109 map_queue_fn *map_queue;
110
111 /*
112 * Called on request timeout
113 */
Christoph Hellwig0152fb62014-09-13 16:40:13 -0700114 timeout_fn *timeout;
Jens Axboe320ae512013-10-24 09:20:05 +0100115
Christoph Hellwig30a91cb2014-02-10 03:24:38 -0800116 softirq_done_fn *complete;
117
Jens Axboe320ae512013-10-24 09:20:05 +0100118 /*
Jens Axboe320ae512013-10-24 09:20:05 +0100119 * Called when the block layer side of a hardware queue has been
120 * set up, allowing the driver to allocate/init matching structures.
121 * Ditto for exit/teardown.
122 */
123 init_hctx_fn *init_hctx;
124 exit_hctx_fn *exit_hctx;
Christoph Hellwige9b267d2014-04-15 13:59:10 -0600125
126 /*
127 * Called for every command allocated by the block layer to allow
128 * the driver to set up driver specific data.
Ming Leif70ced02014-09-25 23:23:47 +0800129 *
130 * Tag greater than or equal to queue_depth is for setting up
131 * flush request.
132 *
Christoph Hellwige9b267d2014-04-15 13:59:10 -0600133 * Ditto for exit/teardown.
134 */
135 init_request_fn *init_request;
136 exit_request_fn *exit_request;
Jens Axboe320ae512013-10-24 09:20:05 +0100137};
138
139enum {
140 BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
141 BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
142 BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
143
144 BLK_MQ_F_SHOULD_MERGE = 1 << 0,
Jens Axboe8a58d1f2014-08-15 12:38:41 -0600145 BLK_MQ_F_TAG_SHARED = 1 << 1,
146 BLK_MQ_F_SG_MERGE = 1 << 2,
147 BLK_MQ_F_SYSFS_UP = 1 << 3,
Jens Axboee167dfb2014-10-29 11:18:26 -0600148 BLK_MQ_F_DEFER_ISSUE = 1 << 4,
Shaohua Li24391c02015-01-23 14:18:00 -0700149 BLK_MQ_F_ALLOC_POLICY_START_BIT = 8,
150 BLK_MQ_F_ALLOC_POLICY_BITS = 1,
Jens Axboe320ae512013-10-24 09:20:05 +0100151
Jens Axboe5d12f902014-03-19 15:25:02 -0600152 BLK_MQ_S_STOPPED = 0,
Jens Axboe0d2602c2014-05-13 15:10:52 -0600153 BLK_MQ_S_TAG_ACTIVE = 1,
Jens Axboe320ae512013-10-24 09:20:05 +0100154
Jens Axboea4391c62014-06-05 15:21:56 -0600155 BLK_MQ_MAX_DEPTH = 10240,
Jens Axboe506e9312014-05-07 10:26:44 -0600156
157 BLK_MQ_CPU_WORK_BATCH = 8,
Jens Axboe320ae512013-10-24 09:20:05 +0100158};
Shaohua Li24391c02015-01-23 14:18:00 -0700159#define BLK_MQ_FLAG_TO_ALLOC_POLICY(flags) \
160 ((flags >> BLK_MQ_F_ALLOC_POLICY_START_BIT) & \
161 ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1))
162#define BLK_ALLOC_POLICY_TO_MQ_FLAG(policy) \
163 ((policy & ((1 << BLK_MQ_F_ALLOC_POLICY_BITS) - 1)) \
164 << BLK_MQ_F_ALLOC_POLICY_START_BIT)
Jens Axboe320ae512013-10-24 09:20:05 +0100165
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600166struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
Tejun Heo17497ac2014-09-24 13:31:50 -0400167void blk_mq_finish_init(struct request_queue *q);
Jens Axboe320ae512013-10-24 09:20:05 +0100168int blk_mq_register_disk(struct gendisk *);
169void blk_mq_unregister_disk(struct gendisk *);
Jens Axboe320ae512013-10-24 09:20:05 +0100170
Christoph Hellwig24d2f902014-04-15 14:14:00 -0600171int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
172void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
173
Jens Axboe320ae512013-10-24 09:20:05 +0100174void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
175
Christoph Hellwigfeb71da2014-02-20 15:32:37 -0800176void blk_mq_insert_request(struct request *, bool, bool, bool);
Jens Axboe320ae512013-10-24 09:20:05 +0100177void blk_mq_free_request(struct request *rq);
Jens Axboe7c7f2f22014-11-17 10:41:57 -0700178void blk_mq_free_hctx_request(struct blk_mq_hw_ctx *, struct request *rq);
Jens Axboe320ae512013-10-24 09:20:05 +0100179bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
Christoph Hellwig4ce01dd2014-05-27 20:59:46 +0200180struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
181 gfp_t gfp, bool reserved);
Jens Axboe0e62f512014-06-04 10:23:49 -0600182struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
Jens Axboe320ae512013-10-24 09:20:05 +0100183
Bart Van Assche205fb5f2014-10-30 14:45:11 +0100184enum {
185 BLK_MQ_UNIQUE_TAG_BITS = 16,
186 BLK_MQ_UNIQUE_TAG_MASK = (1 << BLK_MQ_UNIQUE_TAG_BITS) - 1,
187};
188
189u32 blk_mq_unique_tag(struct request *rq);
190
191static inline u16 blk_mq_unique_tag_to_hwq(u32 unique_tag)
192{
193 return unique_tag >> BLK_MQ_UNIQUE_TAG_BITS;
194}
195
196static inline u16 blk_mq_unique_tag_to_tag(u32 unique_tag)
197{
198 return unique_tag & BLK_MQ_UNIQUE_TAG_MASK;
199}
200
Jens Axboe320ae512013-10-24 09:20:05 +0100201struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
Jens Axboef14bbe72014-05-27 12:06:53 -0600202struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
Jens Axboe320ae512013-10-24 09:20:05 +0100203
Keith Busch973c0192015-01-07 18:55:43 -0700204int blk_mq_request_started(struct request *rq);
Christoph Hellwige2490072014-09-13 16:40:09 -0700205void blk_mq_start_request(struct request *rq);
Christoph Hellwigc8a446a2014-09-13 16:40:10 -0700206void blk_mq_end_request(struct request *rq, int error);
207void __blk_mq_end_request(struct request *rq, int error);
Jens Axboe320ae512013-10-24 09:20:05 +0100208
Christoph Hellwiged0791b2014-04-16 09:44:57 +0200209void blk_mq_requeue_request(struct request *rq);
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600210void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
Keith Buschc68ed592015-01-07 18:55:44 -0700211void blk_mq_cancel_requeue_work(struct request_queue *q);
Christoph Hellwig6fca6a62014-05-28 08:08:02 -0600212void blk_mq_kick_requeue_list(struct request_queue *q);
Jens Axboe1885b242015-01-07 18:55:45 -0700213void blk_mq_abort_requeue_list(struct request_queue *q);
Christoph Hellwig30a91cb2014-02-10 03:24:38 -0800214void blk_mq_complete_request(struct request *rq);
215
Jens Axboe320ae512013-10-24 09:20:05 +0100216void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
217void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
Christoph Hellwig280d45f2013-10-25 14:45:58 +0100218void blk_mq_stop_hw_queues(struct request_queue *q);
Christoph Hellwig2f268552014-04-16 09:44:56 +0200219void blk_mq_start_hw_queues(struct request_queue *q);
Christoph Hellwig1b4a3252014-04-16 09:44:54 +0200220void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
Christoph Hellwig70f4db62014-04-16 10:48:08 -0600221void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
Christoph Hellwig81481eb2014-09-13 16:40:11 -0700222void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
223 void *priv);
Jens Axboec761d962015-01-02 15:05:12 -0700224void blk_mq_freeze_queue(struct request_queue *q);
Keith Buschb4c6a022014-12-19 17:54:14 -0700225void blk_mq_unfreeze_queue(struct request_queue *q);
226void blk_mq_freeze_queue_start(struct request_queue *q);
Jens Axboe320ae512013-10-24 09:20:05 +0100227
228/*
229 * Driver command data is immediately after the request. So subtract request
230 * size to get back to the original request.
231 */
232static inline struct request *blk_mq_rq_from_pdu(void *pdu)
233{
234 return pdu - sizeof(struct request);
235}
236static inline void *blk_mq_rq_to_pdu(struct request *rq)
237{
238 return (void *) rq + sizeof(*rq);
239}
240
Jens Axboe320ae512013-10-24 09:20:05 +0100241#define queue_for_each_hw_ctx(q, hctx, i) \
Jose Alonso0d0b7d42014-01-28 08:09:46 -0700242 for ((i) = 0; (i) < (q)->nr_hw_queues && \
243 ({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
Jens Axboe320ae512013-10-24 09:20:05 +0100244
245#define queue_for_each_ctx(q, ctx, i) \
Jose Alonso0d0b7d42014-01-28 08:09:46 -0700246 for ((i) = 0; (i) < (q)->nr_queues && \
247 ({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
Jens Axboe320ae512013-10-24 09:20:05 +0100248
249#define hctx_for_each_ctx(hctx, ctx, i) \
Jose Alonso0d0b7d42014-01-28 08:09:46 -0700250 for ((i) = 0; (i) < (hctx)->nr_ctx && \
251 ({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
Jens Axboe320ae512013-10-24 09:20:05 +0100252
253#define blk_ctx_sum(q, sum) \
254({ \
255 struct blk_mq_ctx *__x; \
256 unsigned int __ret = 0, __i; \
257 \
258 queue_for_each_ctx((q), __x, __i) \
259 __ret += sum; \
260 __ret; \
261})
262
263#endif