[PATCH v10 21/21] scripts/arm_processor_error.py: retrieve mpidr if not filled

Mauro Carvalho Chehab
2024-09-14T06:13:54Z

Add support to retrieve mpidr value via qom-get.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
scripts/arm_processor_error.py | 27 +++++++++++++++++++--------
1 file changed, 19 insertions(+), 8 deletions(-)

diff --git a/scripts/arm_processor_error.py b/scripts/arm_processor_error.py
index 62e0c5662232..0a16d4f0d8b1 100644
--- a/scripts/arm_processor_error.py
+++ b/scripts/arm_processor_error.py
@@ -5,12 +5,10 @@
#
# Copyright (C) 2024 Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

-# TODO: current implementation has dummy defaults.
-#
-# For a better implementation, a QMP addition/call is needed to
-# retrieve some data for ARM Processor Error injection:
-#
-# - ARM registers: power_state, mpidr.
+# Note: currently it lacks a method to fill the ARM Processor Error CPER
+# psci field from emulation. On a real hardware, this is filled only
+# when a CPU is not running. Implementing support for it to simulate a
+# real hardware is not trivial.

import argparse
import re
@@ -174,11 +172,24 @@ def send_cper(self, args):
else:
cper["running-state"] = 0

+ if args.mpidr:
+ cper["mpidr-el1"] = arg["mpidr"]
+ elif cpus:
+ cmd_arg = {
+ 'path': cpus[0],
+ 'property': "x-mpidr"
+ }
+ ret = qmp_cmd.send_cmd("qom-get", cmd_arg, may_open=True)
+ if isinstance(ret, int):
+ cper["mpidr-el1"] = ret
+ else:
+ cper["mpidr-el1"] = 0
+
if arm_valid_init:
if args.affinity:
cper["valid"] |= self.arm_valid_bits["affinity"]

- if args.mpidr:
+ if "mpidr-el1" in cper:
cper["valid"] |= self.arm_valid_bits["mpidr"]

if "running-state" in cper:
@@ -362,7 +373,7 @@ def send_cper(self, args):
if isinstance(ret, int):
arg["midr-el1"] = ret

- util.data_add(data, arg.get("mpidr-el1", 0), 8)
+ util.data_add(data, cper["mpidr-el1"], 8)
util.data_add(data, arg.get("midr-el1", 0), 8)
util.data_add(data, cper["running-state"], 4)
util.data_add(data, arg.get("psci-state", 0), 4)
--
2.46.0