linux-kernel - Re: DMA error when sg->offset value is greater than PAGE

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Message-ID: <MWHPR12MB1600948B2F57696189FC7C22C87A0@MWHPR12MB1600.namprd12.prod.outlook.com>
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