On Wed, Oct 07, 2020 at 09:19:32AM -0700, Dan Williams wrote: > On Wed, Oct 7, 2020 at 2:14 AM gregkh@xxxxxxxxxxxxxxxxxxx > > "virtual" here means "not real" :) > Which of these aux device use cases is not a real device? One of my > planned usages for this facility is for the NPEM (Native PCIE > Enclosure Management) mechanism that can appear on any PCIE > bridge/endpoint. While it is true that the NPEM register set does not > get its own PCI-b:d:f address on the host bus, it is still > discoverable by a standard enumeration scheme. It is real auxiliary > device functionality that can appear on any PCIE device where the > kernel can now have one common NPEM driver for all instances in the > topology. Some if not all of the SOF cases are entirely software defined by the firmware downloaded to the audio DSPs.
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