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Received: from cgy1-donard.priv.deltatee.com ([172.16.1.31]) by ale.deltatee.com with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1kb56d-0002PX-U2; Fri, 06 Nov 2020 10:00:57 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1kb56V-0004tQ-Od; Fri, 06 Nov 2020 10:00:47 -0700 From: Logan Gunthorpe To: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org Cc: Stephen Bates , Christoph Hellwig , Dan Williams , Jason Gunthorpe , =?UTF-8?q?Christian=20K=C3=B6nig?= , Ira Weiny , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Logan Gunthorpe Date: Fri, 6 Nov 2020 10:00:34 -0700 Message-Id: <20201106170036.18713-14-logang@deltatee.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201106170036.18713-1-logang@deltatee.com> References: <20201106170036.18713-1-logang@deltatee.com> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 172.16.1.31 X-SA-Exim-Rcpt-To: linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-block@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux-foundation.org, sbates@raithlin.com, hch@lst.de, jgg@ziepe.ca, christian.koenig@amd.com, dan.j.williams@intel.com, iweiny@intel.com, jhubbard@nvidia.com, ddutile@redhat.com, willy@infradead.org, daniel.vetter@ffwll.ch, logang@deltatee.com X-SA-Exim-Mail-From: gunthorp@deltatee.com Subject: [RFC PATCH 13/15] block: Set FOLL_PCI_P2PDMA in bio_map_user_iov() X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When a bio's queue supports PCI P2PDMA, set FOLL_PCI_P2PDMA for iov_iter_get_pages_flags(). This allows PCI P2PDMA pages to be passed from userspace and enables the NVMe passthru requests to use P2PDMA pages. Signed-off-by: Logan Gunthorpe --- block/blk-map.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/blk-map.c b/block/blk-map.c index 21630dccac62..cad8fcfe4f17 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -245,6 +245,7 @@ static int bio_map_user_iov(struct request *rq, struc= t iov_iter *iter, { unsigned int max_sectors =3D queue_max_hw_sectors(rq->q); struct bio *bio, *bounce_bio; + unsigned int flags =3D 0; int ret; int j; =20 @@ -256,13 +257,17 @@ static int bio_map_user_iov(struct request *rq, str= uct iov_iter *iter, return -ENOMEM; bio->bi_opf |=3D req_op(rq); =20 + if (blk_queue_pci_p2pdma(rq->q)) + flags |=3D FOLL_PCI_P2PDMA; + while (iov_iter_count(iter)) { struct page **pages; ssize_t bytes; size_t offs, added =3D 0; int npages; =20 - bytes =3D iov_iter_get_pages_alloc(iter, &pages, LONG_MAX, &offs); + bytes =3D iov_iter_get_pages_alloc_flags(iter, &pages, LONG_MAX, + &offs, flags); if (unlikely(bytes <=3D 0)) { ret =3D bytes ? bytes : -EFAULT; goto out_unmap; --=20 2.20.1