CVS commit: src/sys/dev/pci

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Mon Jan 29 01:05:55 UTC 2024

Modified Files:
        src/sys/dev/pci: agp_i810.c

Log Message:
agp_i810(4): Use ipi(9) for chipset flush on all CPUs, not xcall(9).

i915 now calls into this with a spin lock held, so we have to use
ipi(9), which spin-waits for the other CPUs to complete, rather than
xcall(9), which may sleep-wait.

Fortunately, this is just to execute WBINVD on x86 (and if this code
ever runs on other architectures, which it probably doesn't, it'll be
a similar barrier instruction), so spinning to wait for that on all
CPUs isn't too costly.

PR kern/57878

XXX pullup-10


To generate a diff of this commit:
cvs rdiff -u -r1.125 -r1.126 src/sys/dev/pci/agp_i810.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.