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# Copyright (c) Meta Platforms, Inc. and affiliates.
# SPDX-License-Identifier: LGPL-2.1-or-later
from drgn.helpers.linux.cpumask import for_each_possible_cpu
from drgn.helpers.linux.percpu import per_cpu, per_cpu_ptr
from tests.linux_kernel import (
LinuxKernelTestCase,
prng32,
skip_unless_have_test_kmod,
smp_enabled,
)
class TestPerCpu(LinuxKernelTestCase):
def test_per_cpu(self):
smp = smp_enabled()
for cpu in for_each_possible_cpu(self.prog):
if smp:
self.assertEqual(per_cpu(self.prog["runqueues"], cpu).cpu, cpu)
else:
# struct rq::cpu only exists if CONFIG_SMP=y, so just check
# that we get something valid.
self.assertEqual(
per_cpu(self.prog["runqueues"], cpu).idle.comm.string_(), b"swapper"
)
@skip_unless_have_test_kmod
def test_per_cpu_module_static(self):
for cpu, expected in zip(for_each_possible_cpu(self.prog), prng32("PCPU")):
self.assertEqual(
per_cpu(self.prog["drgn_test_percpu_static"], cpu), expected
)
@skip_unless_have_test_kmod
def test_per_cpu_module_dynamic(self):
for cpu, expected in zip(for_each_possible_cpu(self.prog), prng32("pcpu")):
self.assertEqual(
per_cpu_ptr(self.prog["drgn_test_percpu_dynamic"], cpu)[0], expected
)
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