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

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Date:   Thu, 7 Feb 2019 14:16:13 -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 12:38 PM, Sinan Kaya wrote:
>
> On 2/7/2019 1:41 PM, sathyanarayanan.kuppuswamy@...ux.intel.com wrote:
>> + * As per PCI spec, If page aligned request bit is set, it indicates
>> + * the untranslated address is always aligned to a 4096 byte boundary.
>> + */
>> +int pci_ats_page_aligned(struct pci_dev *pdev)
>> +{
>> +    u16 cap;
>> +
>> +    if (!pdev->ats_cap)
>> +        return 0;
>> +
>> +    pci_read_config_word(pdev, pdev->ats_cap + PCI_ATS_CAP, &cap);
>
> 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.
>
> Can you please check the spec?
>
-- 
Sathyanarayanan Kuppuswamy
Linux kernel developer