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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', 'tcsd'])
18        self._services.stop_services()
19
20
21    def run_once(self):
22        # On a Mario, running the test with 1000 iterations takes 89 seconds,
23        # and with 2000 iterations 163 seconds, i.e. the incremental time for 1
24        # iteration is 74ms.
25        n_iterations = 3000
26
27        try:
28            for iteration in range(n_iterations):
29                utils.system("tpmc getpf")
30        except Exception:
31            raise error.TestError(("TPM communication error at " +
32                                   "iteration %d of %d") %
33                                  (iteration, n_iterations))
34
35
36    def cleanup(self):
37        self._services.restore_services()
38