From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965268AbeB1XnN (ORCPT ); Wed, 28 Feb 2018 18:43:13 -0500 Received: from ale.deltatee.com ([207.54.116.67]:60174 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965052AbeB1XkZ (ORCPT ); Wed, 28 Feb 2018 18:40:25 -0500 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-nvme@lists.infradead.org, linux-rdma@vger.kernel.org, linux-nvdimm@lists.01.org, linux-block@vger.kernel.org Cc: Stephen Bates , Christoph Hellwig , Jens Axboe , Keith Busch , Sagi Grimberg , Bjorn Helgaas , Jason Gunthorpe , Max Gurtovoy , Dan Williams , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Benjamin Herrenschmidt , Alex Williamson , Logan Gunthorpe Date: Wed, 28 Feb 2018 16:40:01 -0700 Message-Id: <20180228234006.21093-6-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180228234006.21093-1-logang@deltatee.com> References: <20180228234006.21093-1-logang@deltatee.com> X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-block@vger.kernel.org, sbates@raithlin.com, hch@lst.de, axboe@kernel.dk, sagi@grimberg.me, bhelgaas@google.com, jgg@mellanox.com, maxg@mellanox.com, keith.busch@intel.com, dan.j.williams@intel.com, benh@kernel.crashing.org, jglisse@redhat.com, alex.williamson@redhat.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v2 05/10] block: Introduce PCI P2P flags for request and request queue X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org QUEUE_FLAG_PCI_P2P is introduced meaning a driver's request queue supports targeting P2P memory. REQ_PCI_P2P is introduced to indicate a particular bio request is directed to/from PCI P2P memory. A request with this flag is not accepted unless the corresponding queues have the QUEUE_FLAG_PCI_P2P flag set. Signed-off-by: Logan Gunthorpe --- block/blk-core.c | 3 +++ include/linux/blk_types.h | 18 +++++++++++++++++- include/linux/blkdev.h | 3 +++ 3 files changed, 23 insertions(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index 2d1a7bbe0634..36a6a304a559 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2183,6 +2183,9 @@ generic_make_request_checks(struct bio *bio) if ((bio->bi_opf & REQ_NOWAIT) && !queue_is_rq_based(q)) goto not_supported; + if ((bio->bi_opf & REQ_PCI_P2PDMA) && !blk_queue_pci_p2pdma(q)) + goto not_supported; + if (should_fail_bio(bio)) goto end_io; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index bf18b95ed92d..490122c85b3f 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -274,6 +274,10 @@ enum req_flag_bits { __REQ_BACKGROUND, /* background IO */ __REQ_NOWAIT, /* Don't wait if request will block */ +#ifdef CONFIG_PCI_P2PDMA + __REQ_PCI_P2PDMA, /* request is to/from P2P memory */ +#endif + /* command specific flags for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ @@ -298,6 +302,18 @@ enum req_flag_bits { #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) #define REQ_NOWAIT (1ULL << __REQ_NOWAIT) +#ifdef CONFIG_PCI_P2PDMA +/* + * Currently SGLs do not support mixed P2P and regular memory so + * requests with P2P memory must not be merged. + */ +#define REQ_PCI_P2PDMA (1ULL << __REQ_PCI_P2PDMA) +#define REQ_IS_PCI_P2PDMA(req) ((req)->cmd_flags & REQ_PCI_P2PDMA) +#else +#define REQ_PCI_P2PDMA 0 +#define REQ_IS_PCI_P2PDMA(req) 0 +#endif /* CONFIG_PCI_P2PDMA */ + #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) #define REQ_DRV (1ULL << __REQ_DRV) @@ -306,7 +322,7 @@ enum req_flag_bits { (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER) #define REQ_NOMERGE_FLAGS \ - (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA) + (REQ_NOMERGE | REQ_PREFLUSH | REQ_FUA | REQ_PCI_P2PDMA) #define bio_op(bio) \ ((bio)->bi_opf & REQ_OP_MASK) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index ed63f3b69c12..0b4a386c73ea 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -698,6 +698,7 @@ struct request_queue { #define QUEUE_FLAG_SCSI_PASSTHROUGH 27 /* queue supports SCSI commands */ #define QUEUE_FLAG_QUIESCED 28 /* queue has been quiesced */ #define QUEUE_FLAG_PREEMPT_ONLY 29 /* only process REQ_PREEMPT requests */ +#define QUEUE_FLAG_PCI_P2PDMA 30 /* device supports pci p2p requests */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ @@ -793,6 +794,8 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q) #define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags) #define blk_queue_scsi_passthrough(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_noretry_request(rq) \ ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \ -- 2.11.0