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pcihp: add ACPI PCI hotplug specific is_hotpluggable_bus() callback

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Provide pcihp specific callback to check if bus is hotpluggable
and consolidate its scattered hotplug criteria there.
While at it clean up no longer needed
   qbus_set_hotplug_handler(BUS(bus), NULL)
workarounds since callback makes qbus_is_hotpluggable() return
correct answer even if hotplug_handler is set on bus.

PS:
see ("pci: fix 'hotplugglable' property behavior") for details
why callback was introduced.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20230302161543.286002-35-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2023-03-02 17:15:43 +01:00 • committed by Michael S. Tsirkin
parent 6536e427ce
commit f18e29fc90
7 changed files with 39 additions and 24 deletions
Download patch file Download diff file Expand all files Collapse all files

42
hw/acpi/pcihp.c
View file

@ -121,20 +121,6 @@ static void acpi_set_pci_info(bool has_bridge_hotplug)
}
}
static void acpi_pcihp_disable_root_bus(void)
{
Object *host = acpi_get_i386_pci_host();
PCIBus *bus;
bus = PCI_HOST_BRIDGE(host)->bus;
if (bus && qbus_is_hotpluggable(BUS(bus))) {
/* setting the hotplug handler to NULL makes the bus non-hotpluggable */
qbus_set_hotplug_handler(BUS(bus), NULL);
}
return;
}
static void acpi_pcihp_test_hotplug_bus(PCIBus *bus, void *opaque)
{
AcpiPciHpFind *find = opaque;
@ -278,9 +264,6 @@ static void acpi_pcihp_update(AcpiPciHpState *s)
void acpi_pcihp_reset(AcpiPciHpState *s)
{
if (!s->use_acpi_root_pci_hotplug) {
acpi_pcihp_disable_root_bus();
}
acpi_set_pci_info(s->use_acpi_hotplug_bridge);
acpi_pcihp_update(s);
}
@ -320,13 +303,6 @@ void acpi_pcihp_device_plug_cb(HotplugHandler *hotplug_dev, AcpiPciHpState *s,
object_dynamic_cast(OBJECT(dev), TYPE_PCI_BRIDGE)) {
PCIBus *sec = pci_bridge_get_sec_bus(PCI_BRIDGE(pdev));
/* Remove all hot-plug handlers if hot-plug is disabled on slot */
if (object_dynamic_cast(OBJECT(dev), TYPE_PCIE_SLOT) &&
!PCIE_SLOT(pdev)->hotplug) {
qbus_set_hotplug_handler(BUS(sec), NULL);
return;
}
qbus_set_hotplug_handler(BUS(sec), OBJECT(hotplug_dev));
/* We don't have to overwrite any other hotplug handler yet */
assert(QLIST_EMPTY(&sec->child));
@ -385,6 +361,24 @@ void acpi_pcihp_device_unplug_request_cb(HotplugHandler *hotplug_dev,
acpi_send_event(DEVICE(hotplug_dev), ACPI_PCI_HOTPLUG_STATUS);
}
bool acpi_pcihp_is_hotpluggbale_bus(AcpiPciHpState *s, BusState *bus)
{
Object *o = OBJECT(bus->parent);
if (s->use_acpi_hotplug_bridge &&
object_dynamic_cast(o, TYPE_PCI_BRIDGE)) {
if (object_dynamic_cast(o, TYPE_PCIE_SLOT) && !PCIE_SLOT(o)->hotplug) {
return false;
}
return true;
}
if (s->use_acpi_root_pci_hotplug) {
return true;
}
return false;
}
static uint64_t pci_read(void *opaque, hwaddr addr, unsigned int size)
{
AcpiPciHpState *s = opaque;