diff options
Diffstat (limited to 'include/linux/blk-mq.h')
| -rw-r--r-- | include/linux/blk-mq.h | 93 |
1 files changed, 80 insertions, 13 deletions
diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h index 71f4f0cc3dac..18a2388ba581 100644 --- a/include/linux/blk-mq.h +++ b/include/linux/blk-mq.h @@ -9,9 +9,11 @@ #include <linux/prefetch.h> #include <linux/srcu.h> #include <linux/rw_hint.h> +#include <linux/rwsem.h> struct blk_mq_tags; struct blk_flush_queue; +struct io_comp_batch; #define BLKDEV_MIN_RQ 4 #define BLKDEV_DEFAULT_RQ 128 @@ -21,7 +23,8 @@ enum rq_end_io_ret { RQ_END_IO_FREE, }; -typedef enum rq_end_io_ret (rq_end_io_fn)(struct request *, blk_status_t); +typedef enum rq_end_io_ret (rq_end_io_fn)(struct request *, blk_status_t, + const struct io_comp_batch *); /* * request flags */ @@ -151,6 +154,14 @@ struct request { unsigned short nr_phys_segments; unsigned short nr_integrity_segments; + /* + * The lowest set bit for address gaps between physical segments. This + * provides information necessary for dma optimization opprotunities, + * like for testing if the segments can be coalesced against the + * device's iommu granule. + */ + unsigned char phys_gap_bit; + #ifdef CONFIG_BLK_INLINE_ENCRYPTION struct bio_crypt_ctx *crypt_ctx; struct blk_crypto_keyslot *crypt_keyslot; @@ -207,6 +218,14 @@ struct request { void *end_io_data; }; +/* + * Returns a mask with all bits starting at req->phys_gap_bit set to 1. + */ +static inline unsigned long req_phys_gap_mask(const struct request *req) +{ + return ~(((1 << req->phys_gap_bit) >> 1) - 1); +} + static inline enum req_op req_op(const struct request *req) { return req->cmd_flags & REQ_OP_MASK; @@ -506,6 +525,11 @@ enum hctx_type { * request_queue.tag_set_list. * @srcu: Use as lock when type of the request queue is blocking * (BLK_MQ_F_BLOCKING). + * @tags_srcu: SRCU used to defer freeing of tags page_list to prevent + * use-after-free when iterating tags. + * @update_nr_hwq_lock: + * Synchronize updating nr_hw_queues with add/del disk & + * switching elevator. */ struct blk_mq_tag_set { const struct blk_mq_ops *ops; @@ -527,6 +551,9 @@ struct blk_mq_tag_set { struct mutex tag_list_lock; struct list_head tag_list; struct srcu_struct *srcu; + struct srcu_struct tags_srcu; + + struct rw_semaphore update_nr_hwq_lock; }; /** @@ -761,6 +788,7 @@ struct blk_mq_tags { * request pool */ spinlock_t lock; + struct rcu_head rcu_head; }; static inline struct request *blk_mq_tag_to_rq(struct blk_mq_tags *tags, @@ -852,12 +880,20 @@ static inline bool blk_mq_is_reserved_rq(struct request *rq) return rq->rq_flags & RQF_RESV; } -/* +/** + * blk_mq_add_to_batch() - add a request to the completion batch + * @req: The request to add to batch + * @iob: The batch to add the request + * @is_error: Specify true if the request failed with an error + * @complete: The completaion handler for the request + * * Batched completions only work when there is no I/O error and no special * ->end_io handler. + * + * Return: true when the request was added to the batch, otherwise false */ static inline bool blk_mq_add_to_batch(struct request *req, - struct io_comp_batch *iob, int ioerror, + struct io_comp_batch *iob, bool is_error, void (*complete)(struct io_comp_batch *)) { /* @@ -865,7 +901,7 @@ static inline bool blk_mq_add_to_batch(struct request *req, * 1) No batch container * 2) Has scheduler data attached * 3) Not a passthrough request and end_io set - * 4) Not a passthrough request and an ioerror + * 4) Not a passthrough request and failed with an error */ if (!iob) return false; @@ -874,7 +910,7 @@ static inline bool blk_mq_add_to_batch(struct request *req, if (!blk_rq_is_passthrough(req)) { if (req->end_io) return false; - if (ioerror < 0) + if (is_error) return false; } @@ -933,6 +969,8 @@ int blk_mq_freeze_queue_wait_timeout(struct request_queue *q, void blk_mq_unfreeze_queue_non_owner(struct request_queue *q); void blk_freeze_queue_start_non_owner(struct request_queue *q); +unsigned int blk_mq_num_possible_queues(unsigned int max_queues); +unsigned int blk_mq_num_online_queues(unsigned int max_queues); void blk_mq_map_queues(struct blk_mq_queue_map *qmap); void blk_mq_map_hw_queues(struct blk_mq_queue_map *qmap, struct device *dev, unsigned int offset); @@ -979,8 +1017,20 @@ static inline void *blk_mq_rq_to_pdu(struct request *rq) return rq + 1; } +static inline struct blk_mq_hw_ctx *queue_hctx(struct request_queue *q, int id) +{ + struct blk_mq_hw_ctx *hctx; + + rcu_read_lock(); + hctx = rcu_dereference(q->queue_hw_ctx)[id]; + rcu_read_unlock(); + + return hctx; +} + #define queue_for_each_hw_ctx(q, hctx, i) \ - xa_for_each(&(q)->hctx_table, (i), (hctx)) + for ((i) = 0; (i) < (q)->nr_hw_queues && \ + ({ hctx = queue_hctx((q), i); 1; }); (i)++) #define hctx_for_each_ctx(hctx, ctx, i) \ for ((i) = 0; (i) < (hctx)->nr_ctx && \ @@ -1023,8 +1073,8 @@ int blk_rq_map_user_io(struct request *, struct rq_map_data *, int blk_rq_map_user_iov(struct request_queue *, struct request *, struct rq_map_data *, const struct iov_iter *, gfp_t); int blk_rq_unmap_user(struct bio *); -int blk_rq_map_kern(struct request_queue *, struct request *, void *, - unsigned int, gfp_t); +int blk_rq_map_kern(struct request *rq, void *kbuf, unsigned int len, + gfp_t gfp); int blk_rq_append_bio(struct request *rq, struct bio *bio); void blk_execute_rq_nowait(struct request *rq, bool at_head); blk_status_t blk_execute_rq(struct request *rq, bool at_head); @@ -1165,14 +1215,31 @@ static inline unsigned short blk_rq_nr_discard_segments(struct request *rq) return max_t(unsigned short, rq->nr_phys_segments, 1); } -int __blk_rq_map_sg(struct request_queue *q, struct request *rq, - struct scatterlist *sglist, struct scatterlist **last_sg); -static inline int blk_rq_map_sg(struct request_queue *q, struct request *rq, - struct scatterlist *sglist) +/** + * blk_rq_nr_bvec - return number of bvecs in a request + * @rq: request to calculate bvecs for + * + * Returns the number of bvecs. + */ +static inline unsigned int blk_rq_nr_bvec(struct request *rq) +{ + struct req_iterator rq_iter; + struct bio_vec bv; + unsigned int nr_bvec = 0; + + rq_for_each_bvec(bv, rq, rq_iter) + nr_bvec++; + + return nr_bvec; +} + +int __blk_rq_map_sg(struct request *rq, struct scatterlist *sglist, + struct scatterlist **last_sg); +static inline int blk_rq_map_sg(struct request *rq, struct scatterlist *sglist) { struct scatterlist *last_sg = NULL; - return __blk_rq_map_sg(q, rq, sglist, &last_sg); + return __blk_rq_map_sg(rq, sglist, &last_sg); } void blk_dump_rq_flags(struct request *, char *); |