motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-08 02:03:56 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

platform-bus-device: use device plug callback instead of machine_done notifier

Browse source 
platform-bus were using machine_done notifier to get and map
(assign irq/mmio resources) dynamically added sysbus devices
after all '-device' options had been processed.
That however creates non obvious dependencies on ordering of
machine_done notifiers and requires carefull line juggling
to keep it working. For example see comment above
create_platform_bus() and 'straitforward' arm_load_kernel()
had to converted to machine_done notifier and that lead to
yet another machine_done notifier to keep it working
arm_register_platform_bus_fdt_creator().

Instead of hiding resource assignment in platform-bus-device
to magically initialize sysbus devices, use device plug
callback and assign resources explicitly at board level
at the moment each -device option is being processed.

That adds a bunch of machine declaration boiler plate to
e500plat board, similar to ARM/x86 but gets rid of hidden
machine_done notifier and would allow to remove the dependent
notifiers in ARM code simplifying it and making code flow
easier to follow.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Acked-by: David Gibson <david@gibson.dropbear.id.au>
Message-id: 1525691524-32265-3-git-send-email-imammedo@redhat.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Igor Mammedov 2018-05-10 18:10:56 +01:00 • committed by Peter Maydell
parent 38aefb578d
commit a3fc839635
8 changed files with 92 additions and 50 deletions
Download patch file Download diff file Expand all files Collapse all files

3
hw/arm/sysbus-fdt.c
View file

@ -506,9 +506,6 @@ static void add_all_platform_bus_fdt_nodes(ARMPlatformBusFDTParams *fdt_params)
dev = qdev_find_recursive(sysbus_get_default(), TYPE_PLATFORM_BUS_DEVICE);
pbus = PLATFORM_BUS_DEVICE(dev);
/* We can only create dt nodes for dynamic devices when they're ready */
assert(pbus->done_gathering);
PlatformBusFDTData data = {
.fdt = fdt,
.irq_start = irq_start,

31
hw/arm/virt.c
View file

@ -1150,6 +1150,7 @@ static void create_platform_bus(VirtMachineState *vms, qemu_irq *pic)
qdev_prop_set_uint32(dev, "mmio_size",
platform_bus_params.platform_bus_size);
qdev_init_nofail(dev);
vms->platform_bus_dev = dev;
s = SYS_BUS_DEVICE(dev);
for (i = 0; i < platform_bus_params.platform_bus_num_irqs; i++) {
@ -1627,9 +1628,33 @@ static const CPUArchIdList *virt_possible_cpu_arch_ids(MachineState *ms)
return ms->possible_cpus;
}
static void virt_machine_device_plug_cb(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
VirtMachineState *vms = VIRT_MACHINE(hotplug_dev);
if (vms->platform_bus_dev) {
if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) {
platform_bus_link_device(PLATFORM_BUS_DEVICE(vms->platform_bus_dev),
SYS_BUS_DEVICE(dev));
}
}
}
static HotplugHandler *virt_machine_get_hotplug_handler(MachineState *machine,
DeviceState *dev)
{
if (object_dynamic_cast(OBJECT(dev), TYPE_SYS_BUS_DEVICE)) {
return HOTPLUG_HANDLER(machine);
}
return NULL;
}
static void virt_machine_class_init(ObjectClass *oc, void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
mc->init = machvirt_init;
/* Start max_cpus at the maximum QEMU supports. We'll further restrict
@ -1648,6 +1673,8 @@ static void virt_machine_class_init(ObjectClass *oc, void *data)
mc->cpu_index_to_instance_props = virt_cpu_index_to_props;
mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a15");
mc->get_default_cpu_node_id = virt_get_default_cpu_node_id;
mc->get_hotplug_handler = virt_machine_get_hotplug_handler;
hc->plug = virt_machine_device_plug_cb;
}
static const TypeInfo virt_machine_info = {
@ -1657,6 +1684,10 @@ static const TypeInfo virt_machine_info = {
.instance_size = sizeof(VirtMachineState),
.class_size = sizeof(VirtMachineClass),
.class_init = virt_machine_class_init,
.interfaces = (InterfaceInfo[]) {
{ TYPE_HOTPLUG_HANDLER },
{ }
},
};
static void machvirt_machine_init(void)