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port-amd64/54808: Visual artifacts in Firefox after bus_space changes

>Number:         54808
>Category:       port-amd64
>Synopsis:       Visual artifacts in Firefox after bus_space changes
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Dec 29 15:55:00 +0000 2019
>Release:        NetBSD 9.0_RC1
System: NetBSD 9.0_RC1 NetBSD 9.0_RC1 (GENERIC_DIAGNOSTIC) #2: Sat Dec 28 15:13:18 GMT 2019 amd64
Architecture: x86_64
Machine: amd64
        After pullup of 
        ( src/sys/arch/x86/x86/bus_space.c 1.42 & 1.43)
        visual artifacts are observed in Firefox. 

        Its as if a partial screen update can happen, when drawing a new
        character when typing (eg into gmail or slack), highlighting some text
        or even updating a screen element on hover. Its quickly replaced with
        the correct content.

        Its sometimes quite subtle, and occasionally very unsubtle.

        Two quick videos indicating the issue

        This is on a Thinkpad T480
        i915drmkms0 at pci0 dev 2 function 0: Intel UHD Graphics 620 (GT2) (rev. 0x07)
        intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20151010

         All tests with GENERIC+DIAGNOSTIC:
         - latest netbsd-9 as of 2019-09-27 - issue seen
         - revert pullup of sys/arch/x86/x86/bus_space.c r1.43 - issue seen
         - also revert pullup of sys/arch/x86/x86/bus_space.c r1.42 - issue no
         longer seen

	Its *possible* that I may have seen it once with r1.43 & r1.42
        reverted - which could imply its a x11/drm issue which the better
        barrier enforcement is making more visible. Will keep running with
        GENERIC+DIAGNOSTIC plus the reversion to see if I see it again

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