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1# Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5from autotest_lib.client.bin import test, utils
6from autotest_lib.client.common_lib import error
7from autotest_lib.client.cros import service_stopper
8
9
10class kernel_TPMStress(test.test):
11    "TPM communication stress test"
12    version = 1
13
14
15    def initialize(self):
16        self._services = service_stopper.ServiceStopper(['cryptohomed',
17                                                         'chapsd',
18                                                         'attestationd',
19                                                         'tpm_managerd',
20                                                         'tcsd', 'trunksd'])
21        self._services.stop_services()
22
23
24    def run_once(self):
25        # On a Mario, running the test with 1000 iterations takes 89 seconds,
26        # and with 2000 iterations 163 seconds, i.e. the incremental time for 1
27        # iteration is 74ms.
28        n_iterations = 3000
29
30        try:
31            for iteration in range(n_iterations):
32                utils.system("tpmc getpf")
33        except Exception:
34            raise error.TestError(("TPM communication error at " +
35                                   "iteration %d of %d") %
36                                  (iteration, n_iterations))
37
38
39    def cleanup(self):
40        self._services.restore_services()
41