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Tue, 27 Apr 2021 12:33:54 -0700 (PDT) Received: from ziepe.ca ([206.223.160.26]) by smtp.gmail.com with ESMTPSA id o5sm460461pgq.58.2021.04.27.12.33.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Apr 2021 12:33:53 -0700 (PDT) Received: from jgg by mlx with local (Exim 4.94) (envelope-from ) id 1lbTSx-00Dgwh-Mo; Tue, 27 Apr 2021 16:33:51 -0300 Date: Tue, 27 Apr 2021 16:33:51 -0300 From: Jason Gunthorpe To: Logan Gunthorpe Cc: 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, Stephen Bates , Christoph Hellwig , Dan Williams , Christian =?utf-8?B?S8O2bmln?= , John Hubbard , Don Dutile , Matthew Wilcox , Daniel Vetter , Jakowski Andrzej , Minturn Dave B , Jason Ekstrand , Dave Hansen , Xiong Jianxin , Bjorn Helgaas , Ira Weiny , Robin Murphy Subject: Re: [PATCH 09/16] dma-direct: Support PCI P2PDMA pages in dma-direct map_sg Message-ID: <20210427193351.GR2047089@ziepe.ca> References: <20210408170123.8788-1-logang@deltatee.com> <20210408170123.8788-10-logang@deltatee.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210408170123.8788-10-logang@deltatee.com> X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 284EAFD X-Stat-Signature: 77aosra6dznuz4ij41pad3szhybh9r6j Received-SPF: none (ziepe.ca>: No applicable sender policy available) receiver=imf29; identity=mailfrom; envelope-from=""; helo=mail-pl1-f171.google.com; client-ip=209.85.214.171 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1619552031-143767 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: On Thu, Apr 08, 2021 at 11:01:16AM -0600, Logan Gunthorpe wrote: > Add PCI P2PDMA support for dma_direct_map_sg() so that it can map > PCI P2PDMA pages directly without a hack in the callers. This allows > for heterogeneous SGLs that contain both P2PDMA and regular pages. > > SGL segments that contain PCI bus addresses are marked with > sg_mark_pci_p2pdma() and are ignored when unmapped. > > Signed-off-by: Logan Gunthorpe > kernel/dma/direct.c | 25 ++++++++++++++++++++++--- > 1 file changed, 22 insertions(+), 3 deletions(-) > > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index 002268262c9a..108dfb4ecbd5 100644 > +++ b/kernel/dma/direct.c > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include > #include "direct.h" > > /* > @@ -387,19 +388,37 @@ void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl, > struct scatterlist *sg; > int i; > > - for_each_sg(sgl, sg, nents, i) > + for_each_sg(sgl, sg, nents, i) { > + if (sg_is_pci_p2pdma(sg)) { > + sg_unmark_pci_p2pdma(sg); This doesn't seem nice, the DMA layer should only alter the DMA portion of the SG, not the other portions. Is it necessary? Jason