Merge remote-tracking branch 'remotes/powerpc/topic/ppc-kvm' into kvm-ppc-next

This merges in fixes for the XIVE interrupt controller which touch both
generic powerpc and PPC KVM code.  To avoid merge conflicts, these
commits will go upstream via the powerpc tree as well as the KVM tree.

Signed-off-by: Paul Mackerras <paulus@ozlabs.org>

1 files changed, 182 insertions, 0 deletions

diff --git a/scripts/gdb/linux/device.py b/scripts/gdb/linux/device.py
new file mode 100644
index 000000000000..16376c5cfec6
--- /dev/null
+++ b/scripts/gdb/linux/device.py
@@ -0,0 +1,182 @@
+# 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['bus']
+
+
+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['class']
+
+
+def get_bus_by_name(name):
+    for item in for_each_bus():
+        if item['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['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['p']['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['p']['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['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['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()