diff options
Diffstat (limited to 'include/linux/elevator.h')
| -rw-r--r-- | include/linux/elevator.h | 76 |
1 files changed, 61 insertions, 15 deletions
diff --git a/include/linux/elevator.h b/include/linux/elevator.h index b276e9ef0e0b..5bc8f8682a3e 100644 --- a/include/linux/elevator.h +++ b/include/linux/elevator.h @@ -8,13 +8,26 @@ struct io_cq; struct elevator_type; +#ifdef CONFIG_BLK_DEBUG_FS +struct blk_mq_debugfs_attr; +#endif -typedef int (elevator_merge_fn) (struct request_queue *, struct request **, +/* + * Return values from elevator merger + */ +enum elv_merge { + ELEVATOR_NO_MERGE = 0, + ELEVATOR_FRONT_MERGE = 1, + ELEVATOR_BACK_MERGE = 2, + ELEVATOR_DISCARD_MERGE = 3, +}; + +typedef enum elv_merge (elevator_merge_fn) (struct request_queue *, struct request **, struct bio *); typedef void (elevator_merge_req_fn) (struct request_queue *, struct request *, struct request *); -typedef void (elevator_merged_fn) (struct request_queue *, struct request *, int); +typedef void (elevator_merged_fn) (struct request_queue *, struct request *, enum elv_merge); typedef int (elevator_allow_bio_merge_fn) (struct request_queue *, struct request *, struct bio *); @@ -77,6 +90,35 @@ struct elevator_ops elevator_registered_fn *elevator_registered_fn; }; +struct blk_mq_alloc_data; +struct blk_mq_hw_ctx; + +struct elevator_mq_ops { + int (*init_sched)(struct request_queue *, struct elevator_type *); + void (*exit_sched)(struct elevator_queue *); + int (*init_hctx)(struct blk_mq_hw_ctx *, unsigned int); + void (*exit_hctx)(struct blk_mq_hw_ctx *, unsigned int); + + bool (*allow_merge)(struct request_queue *, struct request *, struct bio *); + bool (*bio_merge)(struct blk_mq_hw_ctx *, struct bio *); + int (*request_merge)(struct request_queue *q, struct request **, struct bio *); + void (*request_merged)(struct request_queue *, struct request *, enum elv_merge); + void (*requests_merged)(struct request_queue *, struct request *, struct request *); + void (*limit_depth)(unsigned int, struct blk_mq_alloc_data *); + void (*prepare_request)(struct request *, struct bio *bio); + void (*finish_request)(struct request *); + void (*insert_requests)(struct blk_mq_hw_ctx *, struct list_head *, bool); + struct request *(*dispatch_request)(struct blk_mq_hw_ctx *); + bool (*has_work)(struct blk_mq_hw_ctx *); + void (*completed_request)(struct request *); + void (*started_request)(struct request *); + void (*requeue_request)(struct request *); + struct request *(*former_request)(struct request_queue *, struct request *); + struct request *(*next_request)(struct request_queue *, struct request *); + void (*init_icq)(struct io_cq *); + void (*exit_icq)(struct io_cq *); +}; + #define ELV_NAME_MAX (16) struct elv_fs_entry { @@ -94,15 +136,23 @@ struct elevator_type struct kmem_cache *icq_cache; /* fields provided by elevator implementation */ - struct elevator_ops ops; + union { + struct elevator_ops sq; + struct elevator_mq_ops mq; + } ops; size_t icq_size; /* see iocontext.h */ size_t icq_align; /* ditto */ struct elv_fs_entry *elevator_attrs; char elevator_name[ELV_NAME_MAX]; struct module *elevator_owner; + bool uses_mq; +#ifdef CONFIG_BLK_DEBUG_FS + const struct blk_mq_debugfs_attr *queue_debugfs_attrs; + const struct blk_mq_debugfs_attr *hctx_debugfs_attrs; +#endif /* managed by elevator core */ - char icq_cache_name[ELV_NAME_MAX + 5]; /* elvname + "_io_cq" */ + char icq_cache_name[ELV_NAME_MAX + 6]; /* elvname + "_io_cq" */ struct list_head list; }; @@ -123,6 +173,7 @@ struct elevator_queue struct kobject kobj; struct mutex sysfs_lock; unsigned int registered:1; + unsigned int uses_mq:1; DECLARE_HASHTABLE(hash, ELV_HASH_BITS); }; @@ -133,12 +184,15 @@ extern void elv_dispatch_sort(struct request_queue *, struct request *); extern void elv_dispatch_add_tail(struct request_queue *, struct request *); extern void elv_add_request(struct request_queue *, struct request *, int); extern void __elv_add_request(struct request_queue *, struct request *, int); -extern int elv_merge(struct request_queue *, struct request **, struct bio *); +extern enum elv_merge elv_merge(struct request_queue *, struct request **, + struct bio *); extern void elv_merge_requests(struct request_queue *, struct request *, struct request *); -extern void elv_merged_request(struct request_queue *, struct request *, int); +extern void elv_merged_request(struct request_queue *, struct request *, + enum elv_merge); extern void elv_bio_merged(struct request_queue *q, struct request *, struct bio *); +extern bool elv_attempt_insert_merge(struct request_queue *, struct request *); extern void elv_requeue_request(struct request_queue *, struct request *); extern struct request *elv_former_request(struct request_queue *, struct request *); extern struct request *elv_latter_request(struct request_queue *, struct request *); @@ -165,8 +219,7 @@ extern ssize_t elv_iosched_show(struct request_queue *, char *); extern ssize_t elv_iosched_store(struct request_queue *, const char *, size_t); extern int elevator_init(struct request_queue *, char *); -extern void elevator_exit(struct elevator_queue *); -extern int elevator_change(struct request_queue *, const char *); +extern void elevator_exit(struct request_queue *, struct elevator_queue *); extern bool elv_bio_merge_ok(struct request *, struct bio *); extern struct elevator_queue *elevator_alloc(struct request_queue *, struct elevator_type *); @@ -185,13 +238,6 @@ extern void elv_rb_del(struct rb_root *, struct request *); extern struct request *elv_rb_find(struct rb_root *, sector_t); /* - * Return values from elevator merger - */ -#define ELEVATOR_NO_MERGE 0 -#define ELEVATOR_FRONT_MERGE 1 -#define ELEVATOR_BACK_MERGE 2 - -/* * Insertion selection */ #define ELEVATOR_INSERT_FRONT 1 |