From patchwork Thu Jan 4 19:01:30 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 10145435 X-Patchwork-Delegate: bhelgaas@google.com Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 1D2CB60654 for ; Thu, 4 Jan 2018 19:02:07 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F0E91287D5 for ; Thu, 4 Jan 2018 19:02:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E59C7287FB; Thu, 4 Jan 2018 19:02:06 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 878F3287D5 for ; Thu, 4 Jan 2018 19:02:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752770AbeADTCC (ORCPT ); Thu, 4 Jan 2018 14:02:02 -0500 Received: from ale.deltatee.com ([207.54.116.67]:39156 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751246AbeADTCA (ORCPT ); Thu, 4 Jan 2018 14:02:00 -0500 Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1eXAm4-0002vi-Td; Thu, 04 Jan 2018 12:01:57 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1eXAlz-00020Z-Hq; Thu, 04 Jan 2018 12:01:51 -0700 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 , Logan Gunthorpe Date: Thu, 4 Jan 2018 12:01:30 -0700 Message-Id: <20180104190137.7654-6-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180104190137.7654-1-logang@deltatee.com> References: <20180104190137.7654-1-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, jglisse@redhat.com, benh@kernel.crashing.org, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH 05/12] 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-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 | 2 ++ 3 files changed, 22 insertions(+), 1 deletion(-) diff --git a/block/blk-core.c b/block/blk-core.c index b8881750a3ac..f347c25731ff 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2141,6 +2141,9 @@ 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_P2P) && !blk_queue_pci_p2p(q)) + goto not_supported; + if (should_fail_request(&bio->bi_disk->part0, bio->bi_iter.bi_size)) goto end_io; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 9e7d8bd776d2..8e1b4d643478 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -228,6 +228,10 @@ enum req_flag_bits { __REQ_BACKGROUND, /* background IO */ __REQ_NOWAIT, /* Don't wait if request will block */ +#ifdef CONFIG_PCI_P2P + __REQ_PCI_P2P, /* request is to/from P2P memory */ +#endif + /* command specific flags for REQ_OP_WRITE_ZEROES: */ __REQ_NOUNMAP, /* do not free blocks when zeroing */ @@ -252,6 +256,18 @@ enum req_flag_bits { #define REQ_BACKGROUND (1ULL << __REQ_BACKGROUND) #define REQ_NOWAIT (1ULL << __REQ_NOWAIT) +#ifdef CONFIG_PCI_P2P +/* + * Currently SGLs do not support mixed P2P and regular memory so + * requests with P2P memory must not be merged. + */ +#define REQ_PCI_P2P (1ULL << __REQ_PCI_P2P) +#define REQ_IS_PCI_P2P(req) ((req)->cmd_flags & REQ_PCI_P2P) +#else +#define REQ_PCI_P2P 0 +#define REQ_IS_PCI_P2P(req) 0 +#endif /* CONFIG_PCI_P2P */ + #define REQ_NOUNMAP (1ULL << __REQ_NOUNMAP) #define REQ_DRV (1ULL << __REQ_DRV) @@ -260,7 +276,7 @@ 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_P2P) #define bio_op(bio) \ ((bio)->bi_opf & REQ_OP_MASK) diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 0ce8a372d506..877b71dd1122 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -651,6 +651,7 @@ 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_P2P 30 /* device supports pci p2p requests */ #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ (1 << QUEUE_FLAG_SAME_COMP) | \ @@ -746,6 +747,7 @@ 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_p2p(q) test_bit(QUEUE_FLAG_PCI_P2P, &(q)->queue_flags) #define blk_noretry_request(rq) \ ((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \