Messages in this thread | | | From | Sinan Kaya <> | Subject | Re: [PATCH v1 1/2] PCI: ATS: Add function to check ATS page aligned request status. | Date | Fri, 8 Feb 2019 23:49:55 -0500 |
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On 2/8/2019 8:02 PM, sathyanarayanan kuppuswamy wrote: >> 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.
v1.2 was incorporated into PCIe spec at that time. However, the ATS spec is old and there could be some HW that could claim to be ATS compatible. I know AMD GPUs declare ATS capability.
See this ECN
https://composter.com.ua/documents/ats_r1.1_26Jan09.pdf
You need to validate the version field from ATS capability header to be 1 before reading this register.
See Table 5-1: ATS Extended Capability Header
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