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

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Message-ID: <MWHPR12MB1600F29183F84D29077FD4BDC8780@MWHPR12MB1600.namprd12.prod.outlook.com>
Date:   Wed, 27 Sep 2017 17:30:08 +0000
From:   Casey Leedom <leedom@...lsio.com>
To:     Robin Murphy <robin.murphy@....com>
CC:     Dan Williams <dan.j.williams@...el.com>,
        "Harsh Jain" <Harsh@...lsio.com>,
        "Raj, Ashok" <ashok.raj@...el.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "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>,
        Michael Werner <werner@...lsio.com>, "nd@....com" <nd@....com>
Subject: Re: DMA error when sg->offset value is greater than PAGE_SIZE in
 Intel IOMMU

| From: Robin Murphy <robin.murphy@....com>
| Sent: Wednesday, September 27, 2017 10:18 AM
| 
| From my experience, in general terms each scatterlist segment
| represents some contiguous quantity of pages, of which sg->page is the
| first, while sg->length and sg->offset describe the specific bounds of
| that segment's data. ...

  Okay, thanks Robin.  That'll help me in my reviews of your and Ashok's
suggested changes to the Intel I/O MMU __domain_mapping() routine.

Casey