[RFC PATCH 17/28] block: Introduce queue flag to indicate support for dma-direct bios
From: Logan Gunthorpe <logang@deltatee.com>
Date: 2019-06-20 16:14:51
Also in:
linux-nvme, linux-pci, linux-rdma, lkml
Subsystem:
block layer, the rest · Maintainers:
Jens Axboe, Linus Torvalds
Queues will need to advertise support to accept dma-direct requests. The existing PCI P2P support which will be replaced by this and thus the P2P flag will be dropped in a subsequent patch. Signed-off-by: Logan Gunthorpe <logang@deltatee.com> --- include/linux/blkdev.h | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index ce70d5dded5f..a5b856324276 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h@@ -616,6 +616,7 @@ struct request_queue { #define QUEUE_FLAG_SCSI_PASSTHROUGH 23 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 24 /* queue has been quiesced */ #define QUEUE_FLAG_PCI_P2PDMA 25 /* device supports PCI p2p requests */ +#define QUEUE_FLAG_DMA_DIRECT 26 /* device supports dma-addr requests */ #define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP))
@@ -642,6 +643,8 @@ bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q); test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags) #define blk_queue_pci_p2pdma(q) \ test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags) +#define blk_queue_dma_direct(q) \ + test_bit(QUEUE_FLAG_DMA_DIRECT, &(q)->queue_flags) #define blk_noretry_request(rq) \ ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
--
2.20.1