Check a PCI device's class, subclass, and progif to figure out if it is
a USB4 NHI. nhi_identifiers is completely removed as only these generic
USB4 NHIs are supported anyway.
PR: 290827
Sponsored by: The FreeBSD Foundation
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Does this mean all TB3 support will be removed? Is there more to cleanup in that case?
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Does this mean all TB3 support will be removed?
as I understood it, USB4 pretty much just standardized existing TB3 controllers, so I guess it would be possible to have a TB3 controller for which a USB4 driver/HCM would work. Not that I know of any such controllers. This is the existing check to set HCM usage, which would maybe imply there are some devices which normally use an ICM but for which a HCM would work:
if (NHI_IS_USB4(sc) || (sc->force_hcm == NHI_FORCE_HCM_ON)) sc->caps |= NHI_CAP_HCM;
maybe @scottl could elucidate this
Is there more to cleanup in that case?
yeah, we should anyway also remove all this force_hcm stuff seeing as that's all we're going to support.