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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 1kb56h-0002PX-HK; Fri, 06 Nov 2020 10:01:00 -0700 Received: from gunthorp by cgy1-donard.priv.deltatee.com with local (Exim 4.92) (envelope-from ) id 1kb56V-0004tE-5g; 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 10:00:30 -0700 Message-Id: <20201106170036.18713-10-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 09/15] nvme-pci: Convert to using dma_map_sg for p2pdma 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: Switch to using sg_dma_p2pdma_len() in places where sg_dma_len() is used. Then replace the calls to pci_p2pdma_[un]map_sg() with calls to dma_[un]map_sg() with DMA_ATTR_P2PDMA. This should be equivalent, though support will be somewhat less (only dma-direct and dma-iommu are currently supported). Using DMA_ATTR_P2PDMA is safe because the block layer restricts requests to be much less than 2GB, thus there's no way for a segment to be greater than 2GB. Signed-off-by: Logan Gunthorpe --- drivers/nvme/host/pci.c | 30 ++++++++++++------------------ 1 file changed, 12 insertions(+), 18 deletions(-) diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index ef7ce464a48d..26976bdf4af0 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -528,12 +528,8 @@ static void nvme_unmap_data(struct nvme_dev *dev, st= ruct request *req) =20 WARN_ON_ONCE(!iod->nents); =20 - if (is_pci_p2pdma_page(sg_page(iod->sg))) - pci_p2pdma_unmap_sg(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req)); - else - dma_unmap_sg(dev->dev, iod->sg, iod->nents, rq_dma_dir(req)); - + dma_unmap_sg_attrs(dev->dev, iod->sg, iod->nents, rq_dma_dir(req), + DMA_ATTR_P2PDMA); =20 if (iod->npages =3D=3D 0) dma_pool_free(dev->prp_small_pool, nvme_pci_iod_list(req)[0], @@ -570,7 +566,7 @@ static void nvme_print_sgl(struct scatterlist *sgl, i= nt nents) pr_warn("sg[%d] phys_addr:%pad offset:%d length:%d " "dma_address:%pad dma_length:%d\n", i, &phys, sg->offset, sg->length, &sg_dma_address(sg), - sg_dma_len(sg)); + sg_dma_p2pdma_len(sg)); } } =20 @@ -581,7 +577,7 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_d= ev *dev, struct dma_pool *pool; int length =3D blk_rq_payload_bytes(req); struct scatterlist *sg =3D iod->sg; - int dma_len =3D sg_dma_len(sg); + int dma_len =3D sg_dma_p2pdma_len(sg); u64 dma_addr =3D sg_dma_address(sg); int offset =3D dma_addr & (NVME_CTRL_PAGE_SIZE - 1); __le64 *prp_list; @@ -601,7 +597,7 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_d= ev *dev, } else { sg =3D sg_next(sg); dma_addr =3D sg_dma_address(sg); - dma_len =3D sg_dma_len(sg); + dma_len =3D sg_dma_p2pdma_len(sg); } =20 if (length <=3D NVME_CTRL_PAGE_SIZE) { @@ -650,7 +646,7 @@ static blk_status_t nvme_pci_setup_prps(struct nvme_d= ev *dev, goto bad_sgl; sg =3D sg_next(sg); dma_addr =3D sg_dma_address(sg); - dma_len =3D sg_dma_len(sg); + dma_len =3D sg_dma_p2pdma_len(sg); } =20 done: @@ -670,7 +666,7 @@ static void nvme_pci_sgl_set_data(struct nvme_sgl_des= c *sge, struct scatterlist *sg) { sge->addr =3D cpu_to_le64(sg_dma_address(sg)); - sge->length =3D cpu_to_le32(sg_dma_len(sg)); + sge->length =3D cpu_to_le32(sg_dma_p2pdma_len(sg)); sge->type =3D NVME_SGL_FMT_DATA_DESC << 4; } =20 @@ -814,14 +810,12 @@ static blk_status_t nvme_map_data(struct nvme_dev *= dev, struct request *req, if (!iod->nents) goto out; =20 - if (is_pci_p2pdma_page(sg_page(iod->sg))) - nr_mapped =3D pci_p2pdma_map_sg_attrs(dev->dev, iod->sg, - iod->nents, rq_dma_dir(req), DMA_ATTR_NO_WARN); - else - nr_mapped =3D dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, - rq_dma_dir(req), DMA_ATTR_NO_WARN); - if (!nr_mapped) + nr_mapped =3D dma_map_sg_attrs(dev->dev, iod->sg, iod->nents, + rq_dma_dir(req), DMA_ATTR_NO_WARN | DMA_ATTR_P2PDMA); + if (!nr_mapped) { + ret =3D BLK_STS_IOERR; goto out; + } =20 iod->use_sgl =3D nvme_pci_use_sgls(dev, req); if (iod->use_sgl) --=20 2.20.1