# Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved. # # SPDX-License-Identifier: GPL-2.0 # Test U-Boot's "dfu" command. The test starts DFU in U-Boot, waits for USB # device enumeration on the host, executes dfu-util multiple times to test # various transfer sizes, many of which trigger USB driver edge cases, and # finally aborts the "dfu" command in U-Boot. import os import os.path import pytest import u_boot_utils ''' Note: This test relies on: a) boardenv_* to contain configuration values to define which USB ports are available for testing. Without this, this test will be automatically skipped. For example: env__usb_dev_ports = ( { "tgt_usb_ctlr": "0", "host_usb_dev_node": "/dev/usbdev-p2371-2180", # This parameter is optional /if/ you only have a single board # attached to your host at a time. "host_usb_port_path": "3-13", }, ) env__dfu_configs = ( # eMMC, partition 1 { "alt_info": "/dfu_test.bin ext4 0 1;/dfu_dummy.bin ext4 0 1", "cmd_params": "mmc 0", }, ) b) udev rules to set permissions on devices nodes, so that sudo is not required. For example: ACTION=="add", SUBSYSTEM=="block", SUBSYSTEMS=="usb", KERNELS=="3-13", MODE:="666" (You may wish to change the group ID instead of setting the permissions wide open. All that matters is that the user ID running the test can access the device.) ''' # The set of file sizes to test. These values trigger various edge-cases such # as one less than, equal to, and one greater than typical USB max packet # sizes, and similar boundary conditions. test_sizes = ( 64 - 1, 64, 64 + 1, 128 - 1, 128, 128 + 1, 960 - 1, 960, 960 + 1, 4096 - 1, 4096, 4096 + 1, 1024 * 1024 - 1, 1024 * 1024, 8 * 1024 * 1024, ) first_usb_dev_port = None @pytest.mark.buildconfigspec('cmd_dfu') def test_dfu(u_boot_console, env__usb_dev_port, env__dfu_config): '''Test the "dfu" command; the host system must be able to enumerate a USB device when "dfu" is running, various DFU transfers are tested, and the USB device must disappear when "dfu" is aborted. Args: u_boot_console: A U-Boot console connection. env__usb_dev_port: The single USB device-mode port specification on which to run the test. See the file-level comment above for details of the format. env__dfu_config: The single DFU (memory region) configuration on which to run the test. See the file-level comment above for details of the format. Returns: Nothing. ''' def start_dfu(): '''Start U-Boot's dfu shell command. This also waits for the host-side USB enumeration process to complete. Args: None. Returns: Nothing. ''' u_boot_console.log.action( 'Starting long-running U-Boot dfu shell command') cmd = 'setenv dfu_alt_info "%s"' % env__dfu_config['alt_info'] u_boot_console.run_command(cmd) cmd = 'dfu 0 ' + env__dfu_config['cmd_params'] u_boot_console.run_command(cmd, wait_for_prompt=False) u_boot_console.log.action('Waiting for DFU USB device to appear') fh = u_boot_utils.wait_until_open_succeeds( env__usb_dev_port['host_usb_dev_node']) fh.close() def stop_dfu(ignore_errors): '''Stop U-Boot's dfu shell command from executing. This also waits for the host-side USB de-enumeration process to complete. Args: ignore_errors: Ignore any errors. This is useful if an error has already been detected, and the code is performing best-effort cleanup. In this case, we do not want to mask the original error by "honoring" any new errors. Returns: Nothing. ''' try: u_boot_console.log.action( 'Stopping long-running U-Boot dfu shell command') u_boot_console.ctrlc() u_boot_console.log.action( 'Waiting for DFU USB device to disappear') u_boot_utils.wait_until_file_open_fails( env__usb_dev_port['host_usb_dev_node'], ignore_errors) except: if not ignore_errors: raise def run_dfu_util(alt_setting, fn, up_dn_load_arg): '''Invoke dfu-util on the host. Args: alt_setting: The DFU "alternate setting" identifier to interact with. fn: The host-side file name to transfer. up_dn_load_arg: '-U' or '-D' depending on whether a DFU upload or download operation should be performed. Returns: Nothing. ''' cmd = ['dfu-util', '-a', str(alt_setting), up_dn_load_arg, fn] if 'host_usb_port_path' in env__usb_dev_port: cmd += ['-p', env__usb_dev_port['host_usb_port_path']] u_boot_utils.run_and_log(u_boot_console, cmd) u_boot_console.wait_for('Ctrl+C to exit ...') def dfu_write(alt_setting, fn): '''Write a file to the target board using DFU. Args: alt_setting: The DFU "alternate setting" identifier to interact with. fn: The host-side file name to transfer. Returns: Nothing. ''' run_dfu_util(alt_setting, fn, '-D') def dfu_read(alt_setting, fn): '''Read a file from the target board using DFU. Args: alt_setting: The DFU "alternate setting" identifier to interact with. fn: The host-side file name to transfer. Returns: Nothing. ''' # dfu-util fails reads/uploads if the host file already exists if os.path.exists(fn): os.remove(fn) run_dfu_util(alt_setting, fn, '-U') def dfu_write_read_check(size): '''Test DFU transfers of a specific size of data This function first writes data to the board then reads it back and compares the written and read back data. Measures are taken to avoid certain types of false positives. Args: size: The data size to test. Returns: Nothing. ''' test_f = u_boot_utils.PersistentRandomFile(u_boot_console, 'dfu_%d.bin' % size, size) readback_fn = u_boot_console.config.result_dir + '/dfu_readback.bin' u_boot_console.log.action('Writing test data to DFU primary ' + 'altsetting') dfu_write(0, test_f.abs_fn) u_boot_console.log.action('Writing dummy data to DFU secondary ' + 'altsetting to clear DFU buffers') dfu_write(1, dummy_f.abs_fn) u_boot_console.log.action('Reading DFU primary altsetting for ' + 'comparison') dfu_read(0, readback_fn) u_boot_console.log.action('Comparing written and read data') written_hash = test_f.content_hash read_back_hash = u_boot_utils.md5sum_file(readback_fn, size) assert(written_hash == read_back_hash) # This test may be executed against multiple USB ports. The test takes a # long time, so we don't want to do the whole thing each time. Instead, # execute the full test on the first USB port, and perform a very limited # test on other ports. In the limited case, we solely validate that the # host PC can enumerate the U-Boot USB device. global first_usb_dev_port if not first_usb_dev_port: first_usb_dev_port = env__usb_dev_port if env__usb_dev_port == first_usb_dev_port: sizes = test_sizes else: sizes = [] dummy_f = u_boot_utils.PersistentRandomFile(u_boot_console, 'dfu_dummy.bin', 1024) ignore_cleanup_errors = True try: start_dfu() u_boot_console.log.action( 'Overwriting DFU primary altsetting with dummy data') dfu_write(0, dummy_f.abs_fn) for size in sizes: with u_boot_console.log.section("Data size %d" % size): dfu_write_read_check(size) # Make the status of each sub-test obvious. If the test didn't # pass, an exception was thrown so this code isn't executed. u_boot_console.log.status_pass('OK') ignore_cleanup_errors = False finally: stop_dfu(ignore_cleanup_errors)