xref: /openbmc/u-boot/test/py/tests/test_ums.py (revision 82d72a1b) 
1# Copyright (c) 2015-2016, NVIDIA CORPORATION. All rights reserved.
2#
3# SPDX-License-Identifier: GPL-2.0
4
5# Test U-Boot's "ums" command. At present, this test only ensures that a UMS
6# device can be enumerated by the host/test machine. In the future, this test
7# should be enhanced to validate disk IO.
8
9import os
10import pytest
11import time
12
13'''
14Note: This test relies on:
15
16a) boardenv_* to contain configuration values to define which USB ports are
17available for testing. Without this, this test will be automatically skipped.
18For example:
19
20env__usb_dev_ports = (
21    {'tgt_usb_ctlr': '0', 'host_ums_dev_node': '/dev/disk/by-path/pci-0000:00:14.0-usb-0:13:1.0-scsi-0:0:0:0'},
22)
23
24env__block_devs = (
25    {'type': 'mmc', 'id': '0'}, # eMMC; always present
26    {'type': 'mmc', 'id': '1'}, # SD card; present since I plugged one in
27)
28
29b) udev rules to set permissions on devices nodes, so that sudo is not
30required. For example:
31
32ACTION=="add", SUBSYSTEM=="block", SUBSYSTEMS=="usb", KERNELS=="3-13", MODE:="666"
33
34(You may wish to change the group ID instead of setting the permissions wide
35open. All that matters is that the user ID running the test can access the
36device.)
37'''
38
39def open_ums_device(host_ums_dev_node):
40    '''Attempt to open a device node, returning either the opened file handle,
41    or None on any error.'''
42
43    try:
44        return open(host_ums_dev_node, 'rb')
45    except:
46        return None
47
48def wait_for_ums_device(host_ums_dev_node):
49    '''Continually attempt to open the device node exported by the "ums"
50    command, and either return the opened file handle, or raise an exception
51    after a timeout.'''
52
53    for i in xrange(100):
54        fh = open_ums_device(host_ums_dev_node)
55        if fh:
56            return fh
57        time.sleep(0.1)
58    raise Exception('UMS device did not appear')
59
60def wait_for_ums_device_gone(host_ums_dev_node):
61    '''Continually attempt to open the device node exported by the "ums"
62    command, and either return once the device has disappeared, or raise an
63    exception if it does not before a timeout occurs.'''
64
65    for i in xrange(100):
66        fh = open_ums_device(host_ums_dev_node)
67        if not fh:
68            return
69        fh.close()
70        time.sleep(0.1)
71    raise Exception('UMS device did not disappear')
72
73@pytest.mark.buildconfigspec('cmd_usb_mass_storage')
74def test_ums(u_boot_console, env__usb_dev_port, env__block_devs):
75    '''Test the "ums" command; the host system must be able to enumerate a UMS
76    device when "ums" is running, and this device must disappear when "ums" is
77    aborted.'''
78
79    tgt_usb_ctlr = env__usb_dev_port['tgt_usb_ctlr']
80    host_ums_dev_node = env__usb_dev_port['host_ums_dev_node']
81
82    # We're interested in testing USB device mode on each port, not the cross-
83    # product of that with each device. So, just pick the first entry in the
84    # device list here. We'll test each block device somewhere else.
85    tgt_dev_type = env__block_devs[0]['type']
86    tgt_dev_id = env__block_devs[0]['id']
87
88    cmd = 'ums %s %s %s' % (tgt_usb_ctlr, tgt_dev_type, tgt_dev_id)
89    u_boot_console.run_command('ums 0 mmc 0', wait_for_prompt=False)
90    fh = wait_for_ums_device(host_ums_dev_node)
91    fh.read(4096)
92    fh.close()
93    u_boot_console.ctrlc()
94    wait_for_ums_device_gone(host_ums_dev_node)
95