hw/pci-bridge: make building pcie-to-pci bridge configurable

Introduce a CONFIG option to build the pcie-to-pci bridge. No
functional change since it's enabled per default for PCIE_PORT=y.

Signed-off-by: Sebastian Ott <sebott@redhat.com>
Message-Id: <72b6599d-6b27-00b5-aac5-2ebc16a2e023@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/pci-bridge/Kconfig

@@ -3,6 +3,11 @@ config PCIE_PORT
     default y if PCI_DEVICES
     depends on PCI_EXPRESS && MSI_NONBROKEN
 
+config PCIE_PCI_BRIDGE
+    bool
+    default y if PCIE_PORT
+    depends on PCIE_PORT
+
 config PXB
     bool
     default y if Q35 || ARM_VIRT

hw/pci-bridge/meson.build

@@ -2,7 +2,8 @@ pci_ss = ss.source_set()
 pci_ss.add(files('pci_bridge_dev.c'))
 pci_ss.add(when: 'CONFIG_I82801B11', if_true: files('i82801b11.c'))
 pci_ss.add(when: 'CONFIG_IOH3420', if_true: files('ioh3420.c'))
-pci_ss.add(when: 'CONFIG_PCIE_PORT', if_true: files('pcie_root_port.c', 'gen_pcie_root_port.c', 'pcie_pci_bridge.c'))
+pci_ss.add(when: 'CONFIG_PCIE_PORT', if_true: files('pcie_root_port.c', 'gen_pcie_root_port.c'))
+pci_ss.add(when: 'CONFIG_PCIE_PCI_BRIDGE', if_true: files('pcie_pci_bridge.c'))
 pci_ss.add(when: 'CONFIG_PXB', if_true: files('pci_expander_bridge.c'),
                                if_false: files('pci_expander_bridge_stubs.c'))
 pci_ss.add(when: 'CONFIG_XIO3130', if_true: files('xio3130_upstream.c', 'xio3130_downstream.c'))