From: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Date: Thu, 28 Jul 2022 22:07:46 +0530
Subject: powerpc/perf: Include caps feature for power10 DD1 version
Git-commit: 8c9f37a78f70fad763f0d61f03245bb011765086
Patch-mainline: v6.0-rc1
References: jsc#PED-557

Commit 6320e693d98c ("powerpc/perf: Add support for caps under sysfs in
powerpc") added support for caps under sysfs in powerpc. This added caps
directory to: /sys/bus/event_source/devices/cpu/ for power8, power9,
power10 and generic compat PMU in respective PMU driver code.

For power10, it is added under "power10_pmu_attr_groups". But
for DD1 version, attr_groups are defined under dd1 array:
"power10_pmu_attr_groups_dd1". Since caps is not added for DD1,
it fails to include "cpu/caps" in DD1 model.

The issue was observed while booting power10 pseries with qemu version
6, but not observed with qemu version 7. This is because qemu version 7
uses a DD 2.0 CPU model.

Below is the trace log:

  Can't update unknown attr grp name: cpu/caps^M
  ------------[ cut here ]------------^M
  Failed to register pmu: cpu, reason -22^M
  WARNING: CPU: 1 PID: 1 at kernel/events/core.c:13427 perf_event_sysfs_init+0xbc/0x108^M
  Modules linked in:^M
  CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.19.0-rc2-00111-g6320e693d98c #148^M
  NIP:  c0000000020391f4 LR: c0000000020391f0 CTR: c0000000008c9c30^M
  REGS: c0000000044c38c0 TRAP: 0700   Not tainted  (5.19.0-rc2-00111-g6320e693d98c)^M
  MSR:  8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE>  CR: 48000281  XER: 20040000^M
  CFAR: c00000000013feac IRQMASK: 0 ^M
  GPR00: c0000000020391f0 c0000000044c3b60 c00000000283db00 0000000000000027 ^M
  GPR04: 80000000ffffe0a8 0000000000000000 0000000000000004 00000000fdcd0000 ^M
  GPR08: 0000000000000027 c0000000ffe07e08 0000000000000001 0000000000000000 ^M
  GPR12: c00000000035dd90 c0000000fffff300 c000000000012478 0000000000000000 ^M
  GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ^M
  GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000 ^M
  GPR24: c000000002003480 0000000000000007 c0000000012a78d0 c000000001170a80 ^M
  GPR28: c0000000026c4df8 c0000000026c4e68 0000000000000000 c0000000025a8628 ^M
  NIP [c0000000020391f4] perf_event_sysfs_init+0xbc/0x108^M
  LR [c0000000020391f0] perf_event_sysfs_init+0xb8/0x108^M
  Call Trace:^M
  [c0000000044c3b60] [c0000000020391f0] perf_event_sysfs_init+0xb8/0x108 (unreliable)^M
  [c0000000044c3bf0] [c000000000011ec4] do_one_initcall+0x64/0x2d0^M
  [c0000000044c3cd0] [c0000000020049fc] kernel_init_freeable+0x338/0x3e0^M
  [c0000000044c3db0] [c0000000000124a0] kernel_init+0x30/0x1a0^M
  [c0000000044c3e10] [c00000000000cd54] ret_from_kernel_thread+0x5c/0x64^M
  Instruction dump:^M
  813f0038 2c090000 4180002c 7fe3fb78 4a3280c5 2c030000 7c651b78 41820018 ^M
  e89f0030 7f63db78 4a106c59 60000000 <0fe00000> ebff0000 4bffffb4 39200001 ^M
  ---[ end trace 0000000000000000 ]---^M

Fix it by adding caps for dd1 attr_groups in power10 PMU driver.

Fixes: 6320e693d98c ("powerpc/perf: Add support for caps under sysfs in powerpc")
Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
[mpe: Update change log to mention qemu 7 DD2.0 CPU model]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20220728163746.85062-1-atrajeev@linux.vnet.ibm.com

Signed-off-by: Tony Jones <tonyj@suse.de>
---
 arch/powerpc/perf/power10-pmu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/powerpc/perf/power10-pmu.c b/arch/powerpc/perf/power10-pmu.c
index 403ba3a69512..9b5133e361a7 100644
--- a/arch/powerpc/perf/power10-pmu.c
+++ b/arch/powerpc/perf/power10-pmu.c
@@ -270,6 +270,7 @@ static struct attribute_group power10_pmu_caps_group = {
 static const struct attribute_group *power10_pmu_attr_groups_dd1[] = {
 	&power10_pmu_format_group,
 	&power10_pmu_events_group_dd1,
+	&power10_pmu_caps_group,
 	NULL,
 };