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

[sathyanarayanan kuppuswamy]

On 2/7/19 12:38 PM, Sinan Kaya wrote:
> On 2/7/2019 1:41 PM, sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx 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)
> > +{
> > +ÂÂÂ u16 cap;
> > +
> > +ÂÂÂ if (!pdev->ats_cap)
> > +ÂÂÂÂÂÂÂ return 0;
> > +
> > +ÂÂÂ 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