block/blk-mq.h

   1 #ifndef INT_BLK_MQ_H
   2 #define INT_BLK_MQ_H
   3
   4 struct blk_mq_ctx {
   5         struct {
   6                 spinlock_t              lock;
   7                 struct list_head        rq_list;
   8         }  ____cacheline_aligned_in_smp;
   9
  10         unsigned int            cpu;
  11         unsigned int            index_hw;
  12         unsigned int            ipi_redirect;
  13
  14         /* incremented at dispatch time */
  15         unsigned long           rq_dispatched[2];
  16         unsigned long           rq_merged;
  17
  18         /* incremented at completion time */
  19         unsigned long           ____cacheline_aligned_in_smp rq_completed[2];
  20
  21         struct request_queue    *queue;
  22         struct kobject          kobj;
  23 };
  24
  25 void __blk_mq_complete_request(struct request *rq);
  26 void blk_mq_run_hw_queue(struct blk_mq_hw_ctx *hctx, bool async);
  27 void blk_mq_init_flush(struct request_queue *q);
  28 void blk_mq_drain_queue(struct request_queue *q);
  29 void blk_mq_free_queue(struct request_queue *q);
  30 void blk_mq_rq_init(struct blk_mq_hw_ctx *hctx, struct request *rq);
  31
  32 /*
  33  * CPU hotplug helpers
  34  */
  35 struct blk_mq_cpu_notifier;
  36 void blk_mq_init_cpu_notifier(struct blk_mq_cpu_notifier *notifier,
  37                               void (*fn)(void *, unsigned long, unsigned int),
  38                               void *data);
  39 void blk_mq_register_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
  40 void blk_mq_unregister_cpu_notifier(struct blk_mq_cpu_notifier *notifier);
  41 void blk_mq_cpu_init(void);
  42 void blk_mq_enable_hotplug(void);
  43 void blk_mq_disable_hotplug(void);
  44
  45 /*
  46  * CPU -> queue mappings
  47  */
  48 struct blk_mq_reg;
  49 extern unsigned int *blk_mq_make_queue_map(struct blk_mq_reg *reg);
  50 extern int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues);
  51
  52 void blk_mq_add_timer(struct request *rq);
  53
  54 #endif