linux-kernel - RE: [PATCH V3 1/2] Documentation: x86: Add documentation for AMD IOMMU

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Date:   Wed, 30 Mar 2022 14:01:00 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     Dave Hansen <dave.hansen@...el.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "corbet@....net" <corbet@....net>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "joro@...tes.org" <joro@...tes.org>,
        "Suthikulpanit, Suravee" <Suravee.Suthikulpanit@....com>,
        "will@...nel.org" <will@...nel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "robin.murphy@....com" <robin.murphy@....com>,
        "Hegde, Vasant" <Vasant.Hegde@....com>
Subject: RE: [PATCH V3 1/2] Documentation: x86: Add documentation for AMD
 IOMMU

[Public]

> -----Original Message-----
> From: Dave Hansen <dave.hansen@...el.com>
> Sent: Tuesday, March 29, 2022 11:25 AM
> To: Deucher, Alexander <Alexander.Deucher@....com>; linux-
> doc@...r.kernel.org; linux-kernel@...r.kernel.org; corbet@....net;
> hpa@...or.com; x86@...nel.org; dave.hansen@...ux.intel.com;
> bp@...en8.de; mingo@...hat.com; tglx@...utronix.de; joro@...tes.org;
> Suthikulpanit, Suravee <Suravee.Suthikulpanit@....com>; will@...nel.org;
> iommu@...ts.linux-foundation.org; robin.murphy@....com; Hegde, Vasant
> <Vasant.Hegde@....com>
> Subject: Re: [PATCH V3 1/2] Documentation: x86: Add documentation for
> AMD IOMMU
> 
> On 3/28/22 10:28, Alex Deucher wrote:
> > +How is IOVA generated?
> > +----------------------
> > +
> > +Well behaved drivers call dma_map_*() calls before sending command to
> > +device that needs to perform DMA. Once DMA is completed and mapping
> > +is no longer required, driver performs dma_unmap_*() calls to unmap the
> region.
> > +
> > +Fault reporting
> > +---------------
> > +
> > +When errors are reported, the IOMMU signals via an interrupt. The
> > +fault reason and device that caused it is printed on the console.
> 
> Just scanning this, it looks *awfully* generic.  Is anything in here AMD-
> specific?  Should this be in an AMD-specific file?

There is some information about the ACPI tables used to enumerate the IOMMUs and a link to the AMD IOMMU programming documentation.  Would you prefer I just create a combined x86 IOMMU document?

Alex