From: Julien Grall <julien.grall@arm.com>
Date: Wed, 7 Jun 2017 11:47:54 +0000 (+0100)
Subject: Skeleton for registering hostbridge
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=8f31c4957d9f782a9f228b50e5b81367947f20e7;p=people%2Fjulieng%2Flinux-arm.git

Skeleton for registering hostbridge
---

diff --git a/arch/arm/xen/Makefile b/arch/arm/xen/Makefile
index 227952103b0b..7ff125e01012 100644
--- a/arch/arm/xen/Makefile
+++ b/arch/arm/xen/Makefile
@@ -1,2 +1,3 @@
 obj-y		:= enlighten.o hypercall.o grant-table.o p2m.o mm.o
 obj-$(CONFIG_XEN_EFI) += efi.o
+obj-$(CONFIG_PCI)     += pci.o
diff --git a/arch/arm/xen/pci.c b/arch/arm/xen/pci.c
new file mode 100644
index 000000000000..933b6b33fa59
--- /dev/null
+++ b/arch/arm/xen/pci.c
@@ -0,0 +1,14 @@
+#include <asm/xen/xen-ops.h>
+#include <linux/printk.h>
+
+void xen_pci_register_host_bridge(struct pci_host_bridge *bridge)
+{
+//	struct physdev_pci_mmcfg_reserved r;
+	struct pci_bus *bus = bridge->bus;
+
+	printk("============== Register Hostbridge ================\n");
+
+	printk("seg %u\n", pci_domain_nr(bus));
+
+	while (1);
+}
diff --git a/arch/arm64/include/asm/xen/xen-ops.h b/arch/arm64/include/asm/xen/xen-ops.h
index e6e784051932..0a601bd7f740 100644
--- a/arch/arm64/include/asm/xen/xen-ops.h
+++ b/arch/arm64/include/asm/xen/xen-ops.h
@@ -2,6 +2,12 @@
 #ifndef _ASM_XEN_OPS_H
 #define _ASM_XEN_OPS_H
 
+#include <linux/pci.h>
+#include <xen/xen-ops.h>
+#include <asm/xen/xen-ops.h>
+
 void xen_efi_runtime_setup(void);
 
+void xen_pci_register_host_bridge(struct pci_host_bridge *bridge);
+
 #endif /* _ASM_XEN_OPS_H */
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 0e2ea1c78542..179494dc4ce8 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -21,6 +21,7 @@
 #include <linux/pci-acpi.h>
 #include <linux/pci-ecam.h>
 #include <linux/slab.h>
+#include <asm/xen/xen-ops.h>
 
 #ifdef CONFIG_ACPI
 /*
@@ -206,11 +207,20 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 void pcibios_add_bus(struct pci_bus *bus)
 {
 	acpi_pci_add_bus(bus);
+
+	/*
+	 * XXX This function is also called for child bus. Maybe we should
+	 * hooked up in another function or check if we are registering
+	 * the root parent
+	 */
+	if (xen_initial_domain() && !pci_is_root_bus(bus))
+		xen_pci_register_host_bridge(pci_find_host_bridge(bus));
 }
 
 void pcibios_remove_bus(struct pci_bus *bus)
 {
 	acpi_pci_remove_bus(bus);
+	/* XXX Implement remove bus */
 }
 
 #endif
diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
index 8ff8aa9c6228..c93c5f8e61b7 100644
--- a/arch/arm64/xen/Makefile
+++ b/arch/arm64/xen/Makefile
@@ -1,3 +1,4 @@
 xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
 obj-y		:= xen-arm.o hypercall.o
 obj-$(CONFIG_XEN_EFI) += $(addprefix ../../arm/xen/, efi.o)
+obj-$(CONFIG_PCI)     += $(addprefix ../../arm/xen/, pci.o)