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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 1kb56f-0002PV-5e; Fri, 06 Nov 2020 10:00:58 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1kb56V-0004tN-K4; 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 10:00:33 -0700 Message-Id: <20201106170036.18713-13-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 12/15] block: Set FOLL_PCI_P2PDMA in __bio_iov_iter_get_pages() 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 O_DIRECT path in iomap based filesystems and direct to block devices. Signed-off-by: Logan Gunthorpe --- block/bio.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/block/bio.c b/block/bio.c index fa01bef35bb1..6b28256a5575 100644 --- a/block/bio.c +++ b/block/bio.c @@ -997,6 +997,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, = struct iov_iter *iter) struct bio_vec *bv =3D bio->bi_io_vec + bio->bi_vcnt; struct page **pages =3D (struct page **)bv; bool same_page =3D false; + unsigned int flags =3D 0; ssize_t size, left; unsigned len, i; size_t offset; @@ -1009,7 +1010,11 @@ static int __bio_iov_iter_get_pages(struct bio *bi= o, struct iov_iter *iter) BUILD_BUG_ON(PAGE_PTRS_PER_BVEC < 2); pages +=3D entries_left * (PAGE_PTRS_PER_BVEC - 1); =20 - size =3D iov_iter_get_pages(iter, pages, LONG_MAX, nr_pages, &offset); + if (bio->bi_disk && blk_queue_pci_p2pdma(bio->bi_disk->queue)) + flags |=3D FOLL_PCI_P2PDMA; + + size =3D iov_iter_get_pages_flags(iter, pages, LONG_MAX, nr_pages, + &offset, flags); if (unlikely(size <=3D 0)) return size ? size : -EFAULT; =20 --=20 2.20.1