powerpc/perf: Add support for caps under sysfs in powerpc

Add caps support under "/sys/bus/event_source/devices/<pmu>/"
for powerpc. This directory can be used to expose some of the
specific features that powerpc PMU supports to the user.
Example: pmu_name. The name of PMU registered will depend on
platform, say power9 or power10 or it could be Generic Compat
PMU.

Currently the only way to know which is the registered
PMU is from the dmesg logs. But clearing the dmesg will make it
difficult to know exact PMU backend used. And even extracting
from dmesg will be complicated, as we need  to parse the dmesg
logs and add filters for pmu name. Whereas by exposing it via
caps will make it easy as we just need to directly read it from
the sysfs.

Add a caps directory to /sys/bus/event_source/devices/cpu/
for power8, power9, power10 and generic compat PMU in respective
PMU driver code. Update the pmu_name file under caps folder
in core-book3s using "attr_update".

The information exposed currently:
 - pmu_name : Underlying PMU name from the driver

Example result with power9 pmu:

 # ls /sys/bus/event_source/devices/cpu/caps
pmu_name

 # cat /sys/bus/event_source/devices/cpu/caps/pmu_name
POWER9

Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220520084630.15181-1-atrajeev@linux.vnet.ibm.com

1 files changed, 10 insertions, 0 deletions

diff --git a/arch/powerpc/perf/generic-compat-pmu.c b/arch/powerpc/perf/generic-compat-pmu.c
index 16392962c511..b5c414876ed5 100644
--- a/arch/powerpc/perf/generic-compat-pmu.c
+++ b/arch/powerpc/perf/generic-compat-pmu.c
@@ -151,9 +151,19 @@ static const struct attribute_group generic_compat_pmu_format_group = {
 	.attrs = generic_compat_pmu_format_attr,
 };
 
+static struct attribute *generic_compat_pmu_caps_attrs[] = {
+	NULL
+};
+
+static struct attribute_group generic_compat_pmu_caps_group = {
+	.name  = "caps",
+	.attrs = generic_compat_pmu_caps_attrs,
+};
+
 static const struct attribute_group *generic_compat_pmu_attr_groups[] = {
 	&generic_compat_pmu_format_group,
 	&generic_compat_pmu_events_group,
+	&generic_compat_pmu_caps_group,
 	NULL,
 };