v4.19.13 snapshot.
diff --git a/arch/x86/pci/init.c b/arch/x86/pci/init.c
new file mode 100644
index 0000000..5fc617e
--- /dev/null
+++ b/arch/x86/pci/init.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <asm/pci_x86.h>
+#include <asm/x86_init.h>
+
+/* arch_initcall has too random ordering, so call the initializers
+ in the right sequence from here. */
+static __init int pci_arch_init(void)
+{
+#ifdef CONFIG_PCI_DIRECT
+ int type = 0;
+
+ type = pci_direct_probe();
+#endif
+
+ if (!(pci_probe & PCI_PROBE_NOEARLY))
+ pci_mmcfg_early_init();
+
+ if (x86_init.pci.arch_init && !x86_init.pci.arch_init())
+ return 0;
+
+#ifdef CONFIG_PCI_BIOS
+ pci_pcbios_init();
+#endif
+ /*
+ * don't check for raw_pci_ops here because we want pcbios as last
+ * fallback, yet it's needed to run first to set pcibios_last_bus
+ * in case legacy PCI probing is used. otherwise detecting peer busses
+ * fails.
+ */
+#ifdef CONFIG_PCI_DIRECT
+ pci_direct_init(type);
+#endif
+ if (!raw_pci_ops && !raw_pci_ext_ops)
+ printk(KERN_ERR
+ "PCI: Fatal: No config space access function found\n");
+
+ dmi_check_pciprobe();
+
+ dmi_check_skip_isa_align();
+
+ return 0;
+}
+arch_initcall(pci_arch_init);