1 # Copyright (c) 2012 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 5 6 # DESCRIPTION : 7 # 8 # This is a hardware test for interrupts. The test reloads kernel module 9 # to check if the hardware issues interrupts back to the host. 10 11 12 import re 13 import time 14 import logging 15 16 from autotest_lib.client.bin import test, utils 17 from autotest_lib.client.common_lib import error 18 19 20 class ProcInterrupts(object): 21 """ 22 Parse /proc/interrupts and provide interfaces to access number of 23 interrupts per module or per interrupt number/name 24 """ 25 26 INTERRUPT_FILE='/proc/interrupts' 27 28 def __init__(self): 29 self._int_count = {} 30 with open(self.INTERRUPT_FILE) as interrupts_file: 31 lines = interrupts_file.readlines() 32 33 # First line indicates CPUs in system 34 num_cpus = len(lines.pop(0).split()) 35 36 for line in lines: 37 fields = line.split() 38 count = sum(map(int, fields[1:1 + num_cpus])) 39 interrupt = fields[0].strip().split(':')[0] 40 if interrupt.isdigit(): 41 self._int_count[fields[-1]] = count 42 logging.debug('int[%s] = %d', fields[-1], count) 43 interrupt = int(interrupt) 44 self._int_count[interrupt] = count 45 logging.debug('int[%s] = %d', interrupt, count) 46 47 def get(self, interrupt): 48 if interrupt in self._int_count: 49 logging.debug('got int[%s] = %d', interrupt, 50 self._int_count[interrupt]) 51 return self._int_count[interrupt] 52 return 0 53 54 55 class hardware_Interrupt(test.test): 56 version = 1 57 58 def run_once(self, 59 interrupt=None, 60 reload_module=None, 61 min_count=1): 62 proc_int = ProcInterrupts() 63 count = proc_int.get(interrupt) 64 65 if reload_module: 66 utils.system('rmmod %s' % reload_module) 67 utils.system('modprobe %s' % reload_module) 68 # Wait for procfs update 69 time.sleep(1) 70 proc_int = ProcInterrupts() 71 count = proc_int.get(interrupt) - count 72 73 if count < min_count: 74 raise error.TestError('Interrupt test failed: int[%s] = %d < ' 75 'min_count %d' % (interrupt, count, 76 min_count)) 77 78
