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# SPDX-License-Identifier: GPL-2.0 # # Copyright (c) NXP 2019 import gdb from linux.utils import CachedType from linux.utils import container_of from linux.lists import list_for_each_entry device_private_type = CachedType('struct device_private') device_type = CachedType('struct device') subsys_private_type = CachedType('struct subsys_private') kobject_type = CachedType('struct kobject') kset_type = CachedType('struct kset') bus_type = CachedType('struct bus_type') class_type = CachedType('struct class') def dev_name(dev): dev_init_name = dev['init_name'] if dev_init_name: return dev_init_name.string() return dev['kobj']['name'].string() def kset_for_each_object(kset): return list_for_each_entry(kset['list'], kobject_type.get_type().pointer(), "entry") def for_each_bus(): for kobj in kset_for_each_object(gdb.parse_and_eval('bus_kset')): subsys = container_of(kobj, kset_type.get_type().pointer(), 'kobj') subsys_priv = container_of(subsys, subsys_private_type.get_type().pointer(), 'subsys') yield subsys_priv def for_each_class(): for kobj in kset_for_each_object(gdb.parse_and_eval('class_kset')): subsys = container_of(kobj, kset_type.get_type().pointer(), 'kobj') subsys_priv = container_of(subsys, subsys_private_type.get_type().pointer(), 'subsys') yield subsys_priv def get_bus_by_name(name): for item in for_each_bus(): if item['bus']['name'].string() == name: return item raise gdb.GdbError("Can't find bus type {!r}".format(name)) def get_class_by_name(name): for item in for_each_class(): if item['class']['name'].string() == name: return item raise gdb.GdbError("Can't find device class {!r}".format(name)) klist_type = CachedType('struct klist') klist_node_type = CachedType('struct klist_node') def klist_for_each(klist): return list_for_each_entry(klist['k_list'], klist_node_type.get_type().pointer(), 'n_node') def bus_for_each_device(bus): for kn in klist_for_each(bus['klist_devices']): dp = container_of(kn, device_private_type.get_type().pointer(), 'knode_bus') yield dp['device'] def class_for_each_device(cls): for kn in klist_for_each(cls['klist_devices']): dp = container_of(kn, device_private_type.get_type().pointer(), 'knode_class') yield dp['device'] def device_for_each_child(dev): for kn in klist_for_each(dev['p']['klist_children']): dp = container_of(kn, device_private_type.get_type().pointer(), 'knode_parent') yield dp['device'] def _show_device(dev, level=0, recursive=False): gdb.write('{}dev {}:\t{}\n'.format('\t' * level, dev_name(dev), dev)) if recursive: for child in device_for_each_child(dev): _show_device(child, level + 1, recursive) class LxDeviceListBus(gdb.Command): '''Print devices on a bus (or all buses if not specified)''' def __init__(self): super(LxDeviceListBus, self).__init__('lx-device-list-bus', gdb.COMMAND_DATA) def invoke(self, arg, from_tty): if not arg: for bus in for_each_bus(): gdb.write('bus {}:\t{}\n'.format(bus['bus']['name'].string(), bus)) for dev in bus_for_each_device(bus): _show_device(dev, level=1) else: bus = get_bus_by_name(arg) if not bus: raise gdb.GdbError("Can't find bus {!r}".format(arg)) for dev in bus_for_each_device(bus): _show_device(dev) class LxDeviceListClass(gdb.Command): '''Print devices in a class (or all classes if not specified)''' def __init__(self): super(LxDeviceListClass, self).__init__('lx-device-list-class', gdb.COMMAND_DATA) def invoke(self, arg, from_tty): if not arg: for cls in for_each_class(): gdb.write("class {}:\t{}\n".format(cls['class']['name'].string(), cls)) for dev in class_for_each_device(cls): _show_device(dev, level=1) else: cls = get_class_by_name(arg) for dev in class_for_each_device(cls): _show_device(dev) class LxDeviceListTree(gdb.Command): '''Print a device and its children recursively''' def __init__(self): super(LxDeviceListTree, self).__init__('lx-device-list-tree', gdb.COMMAND_DATA) def invoke(self, arg, from_tty): if not arg: raise gdb.GdbError('Please provide pointer to struct device') dev = gdb.parse_and_eval(arg) if dev.type != device_type.get_type().pointer(): raise gdb.GdbError('Please provide pointer to struct device') _show_device(dev, level=0, recursive=True) class LxDeviceFindByBusName(gdb.Function): '''Find struct device by bus and name (both strings)''' def __init__(self): super(LxDeviceFindByBusName, self).__init__('lx_device_find_by_bus_name') def invoke(self, bus, name): name = name.string() bus = get_bus_by_name(bus.string()) for dev in bus_for_each_device(bus): if dev_name(dev) == name: return dev class LxDeviceFindByClassName(gdb.Function): '''Find struct device by class and name (both strings)''' def __init__(self): super(LxDeviceFindByClassName, self).__init__('lx_device_find_by_class_name') def invoke(self, cls, name): name = name.string() cls = get_class_by_name(cls.string()) for dev in class_for_each_device(cls): if dev_name(dev) == name: return dev LxDeviceListBus() LxDeviceListClass() LxDeviceListTree() LxDeviceFindByBusName() LxDeviceFindByClassName()