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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 1kb56Z-0002Pa-5l; Fri, 06 Nov 2020 10:00:52 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1kb56U-0004sz-Hw; Fri, 06 Nov 2020 10:00:46 -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 10:00:25 -0700 Message-Id: <20201106170036.18713-5-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 04/15] lib/scatterlist: Add flag for indicating P2PDMA segments in an SGL 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: We make use of the top bit of the dma_length to indicate a P2PDMA segment. Code that uses this will need to use sg_dma_p2pdma_len() to get the length and ensure no lengths exceed 2GB. An sg_dma_is_p2pdma() helper is included to check if a particular segment is p2pdma(). Signed-off-by: Logan Gunthorpe --- include/linux/scatterlist.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h index 36c47e7e66a2..e738159d56f9 100644 --- a/include/linux/scatterlist.h +++ b/include/linux/scatterlist.h @@ -39,6 +39,10 @@ struct scatterlist { #define sg_dma_len(sg) ((sg)->length) #endif =20 +#define SG_P2PDMA_FLAG (1U << 31) +#define sg_dma_p2pdma_len(sg) (sg_dma_len(sg) & ~SG_P2PDMA_FLAG) +#define sg_dma_is_p2pdma(sg) (sg_dma_len(sg) & SG_P2PDMA_FLAG) + struct sg_table { struct scatterlist *sgl; /* the list */ unsigned int nents; /* number of mapped entries */ --=20 2.20.1