linux-kernel - [RFC PATCH 17/28] block: Introduce queue flag to indicate support for dma-direct bios

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Date:   Thu, 20 Jun 2019 10:12:29 -0600
From:   Logan Gunthorpe <logang@...tatee.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-pci@...r.kernel.org,
        linux-rdma@...r.kernel.org
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Keith Busch <kbusch@...nel.org>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Stephen Bates <sbates@...thlin.com>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: [RFC PATCH 17/28] block: Introduce queue flag to indicate support for dma-direct bios

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@...tatee.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