From patchwork Mon Apr 23 23:30:39 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Logan Gunthorpe X-Patchwork-Id: 10358343 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 E026160388 for ; Mon, 23 Apr 2018 23:34:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id D73F628C90 for ; Mon, 23 Apr 2018 23:34:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id CBED928C96; Mon, 23 Apr 2018 23:34:09 +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=-7.9 required=2.0 tests=BAYES_00, MAILING_LIST_MULTI, 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 71D5928C90 for ; Mon, 23 Apr 2018 23:34:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932819AbeDWXch (ORCPT ); Mon, 23 Apr 2018 19:32:37 -0400 Received: from ale.deltatee.com ([207.54.116.67]:41916 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932648AbeDWXbF (ORCPT ); Mon, 23 Apr 2018 19:31:05 -0400 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 1fAkvB-0006J6-Oh; Mon, 23 Apr 2018 17:31:00 -0600 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.89) (envelope-from ) id 1fAkv3-0005bd-IE; Mon, 23 Apr 2018 17:30:49 -0600 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 , =?UTF-8?q?Christian=20K=C3=B6nig?= , Logan Gunthorpe Date: Mon, 23 Apr 2018 17:30:39 -0600 Message-Id: <20180423233046.21476-8-logang@deltatee.com> X-Mailer: git-send-email 2.11.0 In-Reply-To: <20180423233046.21476-1-logang@deltatee.com> References: <20180423233046.21476-1-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, christian.koenig@amd.com, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [PATCH v4 07/14] 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 Reviewed-by: Sagi Grimberg Reviewed-by: Christoph Hellwig --- 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 806ce2442819..35680cbebaf4 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -2270,6 +2270,9 @@ 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 17b18b91ebac..41194d54c45a 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -279,6 +279,10 @@ 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 */ @@ -303,6 +307,18 @@ 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) @@ -311,7 +327,7 @@ 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 9af3e0f430bc..116367babb39 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) | \ @@ -730,6 +731,8 @@ bool blk_queue_flag_test_and_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| \