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arm64 support for pmu-events

Description

arm64 support for pmu-events

8cc3815f:
hwpmc_arm64: accept raw event codes for PMC_OP_PMCALLOCATE

Make it possible to specify event codes without an offset of
PMC_EV_ARMV8_FIRST, by setting a machine-dependent flag. This is
required to make use of event definitions from pmu-events.

Reviewed by: ray (slightly earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D30602

28dd6730:
libpmc: enable pmu_utils on arm64

This allows supported libpmc to query/select from the pmu-events table,
which may have a more complete set of events than what we define
manually. A future update to these definitions should greatly improve
this support. The alias table is empty for now, until this future import
is complete.

Add the Foundation's copyright for recent work on this file.

Reviewed by: ray (slightly earlier version)
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D30603

27ea55fc:
libpmc/hwpmc: fix issues with arm64 pmu-events support

Due to a mis-merge, the changes committed to libpmc never called
pmu_parse_event(), or set pm->pm_ev. However, this field shouldn't be
used to carry the actual pmc event code anyway, as it is expected to
contain the index into the pmu event array (otherwise, it breaks event
name lookup in pmclog_get_event()). Add a new MD field,
pm_md.pm_md_config, to pass the raw event code to arm64_allocate_pmc().

Additionally, the change made to pmc_md_op_pmcallocate was incorrect, as
this is a union, not a struct. Restore the proper padding size.

Reviewed by: luporl, ray, andrew
Fixes: 28dd6730a5d6 ("libpmc: enable pmu_utils on arm64")
Fixes: 8cc3815f02be ("hwpmc_arm64: accept raw event codes...")
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D31221

(cherry picked from commit 8cc3815f02be9fa2a96e47713ad989e6d787e12a)
(cherry picked from commit 28dd6730a5d6bc73aca4c015c0ff875a9def25ac)
(cherry picked from commit 27ea55fc655b0081f760a34ff5dd5526ba02a0fb)

Details