K 10
svn:author
V 6
mhorne
K 8
svn:date
V 27
2021-11-15T15:23:13.752238Z
K 7
svn:log
V 641
hwpmc: initialize arm64 counter/interrupt state

Performance counters and overflow interrupts are assumed to be disabled
by default, but this is not guaranteed. Ensure we disable both during
per-cpu initialization, before enabling the PMU. Otherwise, some systems
(such as the Ampere eMAG) would experience an interrupt storm upon
loading the hwpmc module.

Reviewed by:	br
MFC after:	5 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D32854

(cherry picked from commit b826cc3caf6abc6a5d1926bd478b464938d45697)

Git Hash:   c8a4404da737ea7e859287094de38953a84bdd68
Git Author: mhorne@FreeBSD.org
END