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Date: Mon, 25 Sep 2017 20:05:45 +0000 From: Casey Leedom <leedom@...lsio.com> To: Dan Williams <dan.j.williams@...el.com> CC: Robin Murphy <robin.murphy@....com>, Herbert Xu <herbert@...dor.apana.org.au>, "Harsh Jain" <Harsh@...lsio.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>, "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>, "dwmw2@...radead.org" <dwmw2@...radead.org>, David Woodhouse <David.Woodhouse@...el.com> Subject: Re: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU | From: Dan Williams <dan.j.williams@...el.com> | Sent: Monday, September 25, 2017 12:31 PM | ... | IIUC it looks like this has been broken ever since commit e1605495c716 | "intel-iommu: Introduce domain_sg_mapping() to speed up | intel_map_sg()". I.e. it looks like the calculation for pte_val should | be: | | pteval = (page_to_phys(sg_page(sg)) + sg->offset) | prot; Hhmmm, shouldn't that be: pteval = (page_to_phys(sg_page(sg)) + (sg->offset>>PAGE_SHIFT)) | prot; ??? Casey
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