From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sinan Kaya <okaya@kernel.org>
Subject: Re: [PATCH v1 1/2] PCI: ATS: Add function to check ATS page aligned
 request status.
Date: Thu, 7 Feb 2019 15:38:35 -0500
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References: <cover.1549478584.git.sathyanarayanan.kuppuswamy@linux.intel.com>
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On 2/7/2019 1:41 PM, sathyanarayanan.kuppuswamy@linux.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.

Can you please check the spec?