227 lines
6.1 KiB
C
227 lines
6.1 KiB
C
#ifndef BLK_MQ_H
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#define BLK_MQ_H
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#include <linux/blkdev.h>
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struct blk_mq_tags;
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struct blk_flush_queue;
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struct blk_mq_cpu_notifier {
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struct list_head list;
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void *data;
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int (*notify)(void *data, unsigned long action, unsigned int cpu);
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};
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struct blk_mq_ctxmap {
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unsigned int map_size;
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unsigned int bits_per_word;
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struct blk_align_bitmap *map;
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};
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struct blk_mq_hw_ctx {
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struct {
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spinlock_t lock;
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struct list_head dispatch;
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} ____cacheline_aligned_in_smp;
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unsigned long state; /* BLK_MQ_S_* flags */
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struct delayed_work run_work;
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struct delayed_work delay_work;
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cpumask_var_t cpumask;
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int next_cpu;
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int next_cpu_batch;
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unsigned long flags; /* BLK_MQ_F_* flags */
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struct request_queue *queue;
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unsigned int queue_num;
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struct blk_flush_queue *fq;
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void *driver_data;
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struct blk_mq_ctxmap ctx_map;
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unsigned int nr_ctx;
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struct blk_mq_ctx **ctxs;
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atomic_t wait_index;
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struct blk_mq_tags *tags;
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unsigned long queued;
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unsigned long run;
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#define BLK_MQ_MAX_DISPATCH_ORDER 10
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unsigned long dispatched[BLK_MQ_MAX_DISPATCH_ORDER];
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unsigned int numa_node;
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unsigned int cmd_size; /* per-request extra data */
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atomic_t nr_active;
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struct blk_mq_cpu_notifier cpu_notifier;
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struct kobject kobj;
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};
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struct blk_mq_tag_set {
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struct blk_mq_ops *ops;
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unsigned int nr_hw_queues;
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unsigned int queue_depth; /* max hw supported */
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unsigned int reserved_tags;
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unsigned int cmd_size; /* per-request extra data */
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int numa_node;
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unsigned int timeout;
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unsigned int flags; /* BLK_MQ_F_* */
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void *driver_data;
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struct blk_mq_tags **tags;
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struct mutex tag_list_lock;
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struct list_head tag_list;
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};
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typedef int (queue_rq_fn)(struct blk_mq_hw_ctx *, struct request *, bool);
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typedef struct blk_mq_hw_ctx *(map_queue_fn)(struct request_queue *, const int);
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typedef enum blk_eh_timer_return (timeout_fn)(struct request *, bool);
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typedef int (init_hctx_fn)(struct blk_mq_hw_ctx *, void *, unsigned int);
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typedef void (exit_hctx_fn)(struct blk_mq_hw_ctx *, unsigned int);
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typedef int (init_request_fn)(void *, struct request *, unsigned int,
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unsigned int, unsigned int);
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typedef void (exit_request_fn)(void *, struct request *, unsigned int,
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unsigned int);
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typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
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bool);
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struct blk_mq_ops {
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/*
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* Queue request
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*/
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queue_rq_fn *queue_rq;
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/*
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* Map to specific hardware queue
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*/
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map_queue_fn *map_queue;
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/*
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* Called on request timeout
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*/
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timeout_fn *timeout;
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softirq_done_fn *complete;
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/*
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* Called when the block layer side of a hardware queue has been
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* set up, allowing the driver to allocate/init matching structures.
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* Ditto for exit/teardown.
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*/
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init_hctx_fn *init_hctx;
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exit_hctx_fn *exit_hctx;
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/*
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* Called for every command allocated by the block layer to allow
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* the driver to set up driver specific data.
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*
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* Tag greater than or equal to queue_depth is for setting up
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* flush request.
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*
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* Ditto for exit/teardown.
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*/
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init_request_fn *init_request;
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exit_request_fn *exit_request;
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};
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enum {
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BLK_MQ_RQ_QUEUE_OK = 0, /* queued fine */
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BLK_MQ_RQ_QUEUE_BUSY = 1, /* requeue IO for later */
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BLK_MQ_RQ_QUEUE_ERROR = 2, /* end IO with error */
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BLK_MQ_F_SHOULD_MERGE = 1 << 0,
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BLK_MQ_F_TAG_SHARED = 1 << 1,
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BLK_MQ_F_SG_MERGE = 1 << 2,
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BLK_MQ_F_SYSFS_UP = 1 << 3,
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BLK_MQ_S_STOPPED = 0,
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BLK_MQ_S_TAG_ACTIVE = 1,
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BLK_MQ_MAX_DEPTH = 10240,
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BLK_MQ_CPU_WORK_BATCH = 8,
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};
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struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
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void blk_mq_finish_init(struct request_queue *q);
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int blk_mq_register_disk(struct gendisk *);
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void blk_mq_unregister_disk(struct gendisk *);
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int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
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void blk_mq_free_tag_set(struct blk_mq_tag_set *set);
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void blk_mq_flush_plug_list(struct blk_plug *plug, bool from_schedule);
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void blk_mq_insert_request(struct request *, bool, bool, bool);
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void blk_mq_run_queues(struct request_queue *q, bool async);
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void blk_mq_free_request(struct request *rq);
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bool blk_mq_can_queue(struct blk_mq_hw_ctx *);
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struct request *blk_mq_alloc_request(struct request_queue *q, int rw,
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gfp_t gfp, bool reserved);
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struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, unsigned int tag);
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struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_index);
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struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int, int);
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void blk_mq_start_request(struct request *rq);
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void blk_mq_end_request(struct request *rq, int error);
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void __blk_mq_end_request(struct request *rq, int error);
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void blk_mq_requeue_request(struct request *rq);
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void blk_mq_add_to_requeue_list(struct request *rq, bool at_head);
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void blk_mq_kick_requeue_list(struct request_queue *q);
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void blk_mq_complete_request(struct request *rq);
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void blk_mq_stop_hw_queue(struct blk_mq_hw_ctx *hctx);
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void blk_mq_start_hw_queue(struct blk_mq_hw_ctx *hctx);
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void blk_mq_stop_hw_queues(struct request_queue *q);
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void blk_mq_start_hw_queues(struct request_queue *q);
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void blk_mq_start_stopped_hw_queues(struct request_queue *q, bool async);
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void blk_mq_delay_queue(struct blk_mq_hw_ctx *hctx, unsigned long msecs);
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void blk_mq_tag_busy_iter(struct blk_mq_hw_ctx *hctx, busy_iter_fn *fn,
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void *priv);
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/*
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* Driver command data is immediately after the request. So subtract request
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* size to get back to the original request.
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*/
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static inline struct request *blk_mq_rq_from_pdu(void *pdu)
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{
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return pdu - sizeof(struct request);
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}
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static inline void *blk_mq_rq_to_pdu(struct request *rq)
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{
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return (void *) rq + sizeof(*rq);
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}
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#define queue_for_each_hw_ctx(q, hctx, i) \
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for ((i) = 0; (i) < (q)->nr_hw_queues && \
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({ hctx = (q)->queue_hw_ctx[i]; 1; }); (i)++)
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#define queue_for_each_ctx(q, ctx, i) \
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for ((i) = 0; (i) < (q)->nr_queues && \
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({ ctx = per_cpu_ptr((q)->queue_ctx, (i)); 1; }); (i)++)
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#define hctx_for_each_ctx(hctx, ctx, i) \
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for ((i) = 0; (i) < (hctx)->nr_ctx && \
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({ ctx = (hctx)->ctxs[(i)]; 1; }); (i)++)
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#define blk_ctx_sum(q, sum) \
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({ \
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struct blk_mq_ctx *__x; \
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unsigned int __ret = 0, __i; \
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\
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queue_for_each_ctx((q), __x, __i) \
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__ret += sum; \
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__ret; \
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})
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#endif
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