On 08/05/18 10:50 AM, Christian König wrote:
E.g. transactions are initially send to the root complex for
translation, that's for sure. But at least for AMD GPUs the root complex
answers with the translated address which is then cached in the device.
So further transactions for the same address range then go directly to
Sounds like you are referring to Address Translation Services (ATS).
This is quite separate from ACS and, to my knowledge, isn't widely
supported by switch hardware.