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blk-mq-dma: bring back p2p request flags

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We only need to consider data and metadata dma mapping types separately.
The request and bio integrity payload have enough flag bits to
internally track the mapping type for each. Use these so the caller
doesn't need to track them, and provide separete request and integrity
helpers to the common code. This will make it easier to scale new
mappings, like the proposed MMIO attribute, without burdening the caller
to track such things.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Keith Busch
2025-09-03 12:33:17 -07:00
committed by Jens Axboe
parent 05ceea5d3e
commit d57447ffb5
6 changed files with 35 additions and 19 deletions
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4
block/blk-mq-dma.c
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@@ -174,6 +174,10 @@ static bool blk_dma_map_iter_start(struct request *req, struct device *dma_dev,
switch (pci_p2pdma_state(&iter->p2pdma, dma_dev,
phys_to_page(vec.paddr))) {
case PCI_P2PDMA_MAP_BUS_ADDR:
if (iter->iter.is_integrity)
bio_integrity(req->bio)->bip_flags |= BIP_P2P_DMA;
else
req->cmd_flags |= REQ_P2PDMA;
return blk_dma_map_bus(iter, &vec);
case PCI_P2PDMA_MAP_THRU_HOST_BRIDGE:
/*