mirror of
https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux
synced 2025-11-04 16:52:06 +10:00
c48d8b0489
This is a userspace tool to drive the testing. Currently it supports introducing user specified delay in the host to guest communication path on a per-channel basis. Signed-off-by: Branden Bonaby <brandonbonaby94@gmail.com> Reviewed-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
377 lines
16 KiB
Python
Executable File
377 lines
16 KiB
Python
Executable File
#!/usr/bin/env python3
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# SPDX-License-Identifier: GPL-2.0
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#
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# Program to allow users to fuzz test Hyper-V drivers
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# by interfacing with Hyper-V debugfs attributes.
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# Current test methods available:
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# 1. delay testing
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#
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# Current file/directory structure of hyper-V debugfs:
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# /sys/kernel/debug/hyperv/UUID
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# /sys/kernel/debug/hyperv/UUID/<test-state filename>
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# /sys/kernel/debug/hyperv/UUID/<test-method sub-directory>
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#
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# author: Branden Bonaby <brandonbonaby94@gmail.com>
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import os
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import cmd
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import argparse
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import glob
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from argparse import RawDescriptionHelpFormatter
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from argparse import RawTextHelpFormatter
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from enum import Enum
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# Do not change unless, you change the debugfs attributes
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# in /drivers/hv/debugfs.c. All fuzz testing
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# attributes will start with "fuzz_test".
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# debugfs path for hyperv must exist before proceeding
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debugfs_hyperv_path = "/sys/kernel/debug/hyperv"
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if not os.path.isdir(debugfs_hyperv_path):
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print("{} doesn't exist/check permissions".format(debugfs_hyperv_path))
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exit(-1)
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class dev_state(Enum):
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off = 0
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on = 1
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# File names, that correspond to the files created in
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# /drivers/hv/debugfs.c
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class f_names(Enum):
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state_f = "fuzz_test_state"
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buff_f = "fuzz_test_buffer_interrupt_delay"
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mess_f = "fuzz_test_message_delay"
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# Both single_actions and all_actions are used
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# for error checking and to allow for some subparser
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# names to be abbreviated. Do not abbreviate the
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# test method names, as it will become less intuitive
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# as to what the user can do. If you do decide to
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# abbreviate the test method name, make sure the main
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# function reflects this change.
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all_actions = [
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"disable_all",
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"D",
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"enable_all",
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"view_all",
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"V"
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]
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single_actions = [
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"disable_single",
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"d",
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"enable_single",
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"view_single",
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"v"
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]
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def main():
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file_map = recursive_file_lookup(debugfs_hyperv_path, dict())
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args = parse_args()
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if (not args.action):
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print ("Error, no options selected...exiting")
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exit(-1)
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arg_set = { k for (k,v) in vars(args).items() if v and k != "action" }
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arg_set.add(args.action)
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path = args.path if "path" in arg_set else None
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if (path and path[-1] == "/"):
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path = path[:-1]
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validate_args_path(path, arg_set, file_map)
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if (path and "enable_single" in arg_set):
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state_path = locate_state(path, file_map)
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set_test_state(state_path, dev_state.on.value, args.quiet)
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# Use subparsers as the key for different actions
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if ("delay" in arg_set):
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validate_delay_values(args.delay_time)
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if (args.enable_all):
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set_delay_all_devices(file_map, args.delay_time,
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args.quiet)
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else:
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set_delay_values(path, file_map, args.delay_time,
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args.quiet)
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elif ("disable_all" in arg_set or "D" in arg_set):
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disable_all_testing(file_map)
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elif ("disable_single" in arg_set or "d" in arg_set):
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disable_testing_single_device(path, file_map)
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elif ("view_all" in arg_set or "V" in arg_set):
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get_all_devices_test_status(file_map)
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elif ("view_single" in arg_set or "v" in arg_set):
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get_device_test_values(path, file_map)
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# Get the state location
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def locate_state(device, file_map):
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return file_map[device][f_names.state_f.value]
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# Validate delay values to make sure they are acceptable to
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# enable delays on a device
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def validate_delay_values(delay):
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if (delay[0] == -1 and delay[1] == -1):
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print("\nError, At least 1 value must be greater than 0")
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exit(-1)
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for i in delay:
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if (i < -1 or i == 0 or i > 1000):
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print("\nError, Values must be equal to -1 "
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"or be > 0 and <= 1000")
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exit(-1)
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# Validate argument path
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def validate_args_path(path, arg_set, file_map):
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if (not path and any(element in arg_set for element in single_actions)):
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print("Error, path (-p) REQUIRED for the specified option. "
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"Use (-h) to check usage.")
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exit(-1)
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elif (path and any(item in arg_set for item in all_actions)):
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print("Error, path (-p) NOT REQUIRED for the specified option. "
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"Use (-h) to check usage." )
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exit(-1)
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elif (path not in file_map and any(item in arg_set
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for item in single_actions)):
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print("Error, path '{}' not a valid vmbus device".format(path))
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exit(-1)
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# display Testing status of single device
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def get_device_test_values(path, file_map):
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for name in file_map[path]:
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file_location = file_map[path][name]
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print( name + " = " + str(read_test_files(file_location)))
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# Create a map of the vmbus devices and their associated files
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# [key=device, value = [key = filename, value = file path]]
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def recursive_file_lookup(path, file_map):
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for f_path in glob.iglob(path + '**/*'):
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if (os.path.isfile(f_path)):
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if (f_path.rsplit("/",2)[0] == debugfs_hyperv_path):
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directory = f_path.rsplit("/",1)[0]
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else:
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directory = f_path.rsplit("/",2)[0]
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f_name = f_path.split("/")[-1]
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if (file_map.get(directory)):
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file_map[directory].update({f_name:f_path})
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else:
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file_map[directory] = {f_name:f_path}
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elif (os.path.isdir(f_path)):
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recursive_file_lookup(f_path,file_map)
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return file_map
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# display Testing state of devices
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def get_all_devices_test_status(file_map):
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for device in file_map:
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if (get_test_state(locate_state(device, file_map)) is 1):
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print("Testing = ON for: {}"
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.format(device.split("/")[5]))
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else:
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print("Testing = OFF for: {}"
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.format(device.split("/")[5]))
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# read the vmbus device files, path must be absolute path before calling
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def read_test_files(path):
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try:
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with open(path,"r") as f:
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file_value = f.readline().strip()
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return int(file_value)
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except IOError as e:
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errno, strerror = e.args
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print("I/O error({0}): {1} on file {2}"
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.format(errno, strerror, path))
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exit(-1)
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except ValueError:
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print ("Element to int conversion error in: \n{}".format(path))
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exit(-1)
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# writing to vmbus device files, path must be absolute path before calling
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def write_test_files(path, value):
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try:
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with open(path,"w") as f:
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f.write("{}".format(value))
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except IOError as e:
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errno, strerror = e.args
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print("I/O error({0}): {1} on file {2}"
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.format(errno, strerror, path))
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exit(-1)
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# set testing state of device
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def set_test_state(state_path, state_value, quiet):
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write_test_files(state_path, state_value)
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if (get_test_state(state_path) is 1):
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if (not quiet):
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print("Testing = ON for device: {}"
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.format(state_path.split("/")[5]))
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else:
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if (not quiet):
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print("Testing = OFF for device: {}"
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.format(state_path.split("/")[5]))
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# get testing state of device
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def get_test_state(state_path):
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#state == 1 - test = ON
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#state == 0 - test = OFF
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return read_test_files(state_path)
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# write 1 - 1000 microseconds, into a single device using the
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# fuzz_test_buffer_interrupt_delay and fuzz_test_message_delay
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# debugfs attributes
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def set_delay_values(device, file_map, delay_length, quiet):
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try:
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interrupt = file_map[device][f_names.buff_f.value]
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message = file_map[device][f_names.mess_f.value]
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# delay[0]- buffer interrupt delay, delay[1]- message delay
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if (delay_length[0] >= 0 and delay_length[0] <= 1000):
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write_test_files(interrupt, delay_length[0])
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if (delay_length[1] >= 0 and delay_length[1] <= 1000):
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write_test_files(message, delay_length[1])
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if (not quiet):
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print("Buffer delay testing = {} for: {}"
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.format(read_test_files(interrupt),
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interrupt.split("/")[5]))
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print("Message delay testing = {} for: {}"
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.format(read_test_files(message),
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message.split("/")[5]))
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except IOError as e:
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errno, strerror = e.args
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print("I/O error({0}): {1} on files {2}{3}"
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.format(errno, strerror, interrupt, message))
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exit(-1)
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# enabling delay testing on all devices
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def set_delay_all_devices(file_map, delay, quiet):
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for device in (file_map):
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set_test_state(locate_state(device, file_map),
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dev_state.on.value,
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quiet)
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set_delay_values(device, file_map, delay, quiet)
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# disable all testing on a SINGLE device.
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def disable_testing_single_device(device, file_map):
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for name in file_map[device]:
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file_location = file_map[device][name]
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write_test_files(file_location, dev_state.off.value)
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print("ALL testing now OFF for {}".format(device.split("/")[-1]))
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# disable all testing on ALL devices
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def disable_all_testing(file_map):
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for device in file_map:
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disable_testing_single_device(device, file_map)
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def parse_args():
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parser = argparse.ArgumentParser(prog = "vmbus_testing",usage ="\n"
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"%(prog)s [delay] [-h] [-e|-E] -t [-p]\n"
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"%(prog)s [view_all | V] [-h]\n"
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"%(prog)s [disable_all | D] [-h]\n"
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"%(prog)s [disable_single | d] [-h|-p]\n"
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"%(prog)s [view_single | v] [-h|-p]\n"
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"%(prog)s --version\n",
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description = "\nUse lsvmbus to get vmbus device type "
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"information.\n" "\nThe debugfs root path is "
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"/sys/kernel/debug/hyperv",
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formatter_class = RawDescriptionHelpFormatter)
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subparsers = parser.add_subparsers(dest = "action")
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parser.add_argument("--version", action = "version",
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version = '%(prog)s 0.1.0')
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parser.add_argument("-q","--quiet", action = "store_true",
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help = "silence none important test messages."
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" This will only work when enabling testing"
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" on a device.")
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# Use the path parser to hold the --path attribute so it can
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# be shared between subparsers. Also do the same for the state
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# parser, as all testing methods will use --enable_all and
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# enable_single.
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path_parser = argparse.ArgumentParser(add_help=False)
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path_parser.add_argument("-p","--path", metavar = "",
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help = "Debugfs path to a vmbus device. The path "
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"must be the absolute path to the device.")
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state_parser = argparse.ArgumentParser(add_help=False)
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state_group = state_parser.add_mutually_exclusive_group(required = True)
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state_group.add_argument("-E", "--enable_all", action = "store_const",
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const = "enable_all",
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help = "Enable the specified test type "
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"on ALL vmbus devices.")
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state_group.add_argument("-e", "--enable_single",
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action = "store_const",
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const = "enable_single",
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help = "Enable the specified test type on a "
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"SINGLE vmbus device.")
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parser_delay = subparsers.add_parser("delay",
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parents = [state_parser, path_parser],
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help = "Delay the ring buffer interrupt or the "
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"ring buffer message reads in microseconds.",
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prog = "vmbus_testing",
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usage = "%(prog)s [-h]\n"
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"%(prog)s -E -t [value] [value]\n"
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"%(prog)s -e -t [value] [value] -p",
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description = "Delay the ring buffer interrupt for "
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"vmbus devices, or delay the ring buffer message "
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"reads for vmbus devices (both in microseconds). This "
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"is only on the host to guest channel.")
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parser_delay.add_argument("-t", "--delay_time", metavar = "", nargs = 2,
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type = check_range, default =[0,0], required = (True),
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help = "Set [buffer] & [message] delay time. "
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"Value constraints: -1 == value "
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"or 0 < value <= 1000.\n"
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"Use -1 to keep the previous value for that delay "
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"type, or a value > 0 <= 1000 to change the delay "
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"time.")
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parser_dis_all = subparsers.add_parser("disable_all",
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aliases = ['D'], prog = "vmbus_testing",
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usage = "%(prog)s [disable_all | D] -h\n"
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"%(prog)s [disable_all | D]\n",
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help = "Disable ALL testing on ALL vmbus devices.",
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description = "Disable ALL testing on ALL vmbus "
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"devices.")
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parser_dis_single = subparsers.add_parser("disable_single",
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aliases = ['d'],
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parents = [path_parser], prog = "vmbus_testing",
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usage = "%(prog)s [disable_single | d] -h\n"
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"%(prog)s [disable_single | d] -p\n",
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help = "Disable ALL testing on a SINGLE vmbus device.",
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description = "Disable ALL testing on a SINGLE vmbus "
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"device.")
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parser_view_all = subparsers.add_parser("view_all", aliases = ['V'],
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help = "View the test state for ALL vmbus devices.",
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prog = "vmbus_testing",
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usage = "%(prog)s [view_all | V] -h\n"
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"%(prog)s [view_all | V]\n",
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description = "This shows the test state for ALL the "
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"vmbus devices.")
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parser_view_single = subparsers.add_parser("view_single",
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aliases = ['v'],parents = [path_parser],
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help = "View the test values for a SINGLE vmbus "
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"device.",
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description = "This shows the test values for a SINGLE "
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"vmbus device.", prog = "vmbus_testing",
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usage = "%(prog)s [view_single | v] -h\n"
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"%(prog)s [view_single | v] -p")
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return parser.parse_args()
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# value checking for range checking input in parser
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def check_range(arg1):
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try:
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val = int(arg1)
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except ValueError as err:
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raise argparse.ArgumentTypeError(str(err))
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if val < -1 or val > 1000:
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message = ("\n\nvalue must be -1 or 0 < value <= 1000. "
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"Value program received: {}\n").format(val)
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raise argparse.ArgumentTypeError(message)
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return val
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if __name__ == "__main__":
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main()
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