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-rw-r--r--include/linux/blk-mq-dma.h63
1 files changed, 63 insertions, 0 deletions
diff --git a/include/linux/blk-mq-dma.h b/include/linux/blk-mq-dma.h
new file mode 100644
index 000000000000..c26a01aeae00
--- /dev/null
+++ b/include/linux/blk-mq-dma.h
@@ -0,0 +1,63 @@
+/* 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 */