linux-kernel - Re: [PATCH v1 1/2] PCI: ATS: Add function to check ATS page aligned request status.

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Date:   Fri, 8 Feb 2019 17:02:33 -0800
From:   sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
To:     Sinan Kaya <okaya@...nel.org>, bhelgaas@...gle.com,
        joro@...tes.org, dwmw2@...radead.org
Cc:     linux-pci@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, Ashok Raj <ashok.raj@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Keith Busch <keith.busch@...el.com>
Subject: Re: [PATCH v1 1/2] PCI: ATS: Add function to check ATS page aligned
 request status.


On 2/7/19 5:58 PM, Sinan Kaya wrote:
>
> On 2/7/2019 5:16 PM, sathyanarayanan kuppuswamy wrote:
>>> If I remember this right, aligned request is only supported on ATS v1.1
>>> but not supported on v1.0.
>> Its added in v1.1.
>
> This means that you should probably have some kind of version check
> here.

There is no version field in ATS v1.0 spec. Also, If I follow the 
history log in PCI spec, I think ATS if first added at v1.2. Please 
correct me if I am wrong.

-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer