/* SPDX-License-Identifier: GPL-2.0-only */ #ifndef BLK_MQ_DMA_H #define BLK_MQ_DMA_H #include <linux/blk-mq.h> #include <linux/pci-p2pdma.h> struct blk_dma_iter { /* Output address range for this iteration */ dma_addr_t addr; u32 len; /* Status code. Only valid when blk_rq_dma_map_iter_* returned false */ blk_status_t status; /* Internal to blk_rq_dma_map_iter_* */ struct req_iterator iter; struct pci_p2pdma_map_state p2pdma; }; bool blk_rq_dma_map_iter_start(struct request *req, struct device *dma_dev, struct dma_iova_state *state, struct blk_dma_iter *iter); bool blk_rq_dma_map_iter_next(struct request *req, struct device *dma_dev, struct dma_iova_state *state, struct blk_dma_iter *iter); /** * blk_rq_dma_map_coalesce - were all segments coalesced? * @state: DMA state to check * * Returns true if blk_rq_dma_map_iter_start coalesced all segments into a * single DMA range. */ static inline bool blk_rq_dma_map_coalesce(struct dma_iova_state *state) { return dma_use_iova(state); } /** * blk_rq_dma_unmap - try to DMA unmap a request * @req: request to unmap * @dma_dev: device to unmap from * @state: DMA IOVA state * @mapped_len: number of bytes to unmap * * Returns %false if the callers need to manually unmap every DMA segment * mapped using @iter or %true if no work is left to be done. */ static inline bool blk_rq_dma_unmap(struct request *req, struct device *dma_dev, struct dma_iova_state *state, size_t mapped_len) { if (req->cmd_flags & REQ_P2PDMA) return true; if (dma_use_iova(state)) { dma_iova_destroy(dma_dev, state, mapped_len, rq_dma_dir(req), 0); return true; } return !dma_need_unmap(dma_dev); } #endif /* BLK_MQ_DMA_H */