perf/amd/ibs: Advertise zen4_ibs_extensions as pmu capability attribute

mainline inclusion
from mainline-v5.15
commit 838de1d8
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5S3WV


CVE: NA

-------------------------------------------------

PMU driver can advertise certain feature via capability attribute('caps'
sysfs directory) which can be consumed by userspace tools like perf. Add
zen4_ibs_extensions capability attribute for IBS pmus. This attribute
will be enabled when CPUID_Fn8000001B_EAX[11] is set.

With patch on Zen4:

  $ ls /sys/bus/event_source/devices/ibs_op/caps
  zen4_ibs_extensions

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220509044914.1473-5-ravi.bangoria@amd.com


Signed-off-by: Xie Haocheng <haocheng.xie@amd.com>