1 files changed, 146 insertions, 0 deletions
diff --git a/arch/x86/pci/bus_numa.c b/arch/x86/pci/bus_numa.c
new file mode 100644
index 000000000..2752c02e3
--- /dev/null
+++ b/arch/x86/pci/bus_numa.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/range.h>
+
+#include "bus_numa.h"
+
+LIST_HEAD(pci_root_infos);
+
+static struct pci_root_info *x86_find_pci_root_info(int bus)
+{
+	struct pci_root_info *info;
+
+	list_for_each_entry(info, &pci_root_infos, list)
+		if (info->busn.start == bus)
+			return info;
+
+	return NULL;
+}
+
+int x86_pci_root_bus_node(int bus)
+{
+	struct pci_root_info *info = x86_find_pci_root_info(bus);
+
+	if (!info)
+		return NUMA_NO_NODE;
+
+	return info->node;
+}
+
+void x86_pci_root_bus_resources(int bus, struct list_head *resources)
+{
+	struct pci_root_info *info = x86_find_pci_root_info(bus);
+	struct pci_root_res *root_res;
+	struct resource_entry *window;
+	bool found = false;
+
+	if (!info)
+		goto default_resources;
+
+	printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
+	       bus);
+
+	/* already added by acpi ? */
+	resource_list_for_each_entry(window, resources)
+		if (window->res->flags & IORESOURCE_BUS) {
+			found = true;
+			break;
+		}
+
+	if (!found)
+		pci_add_resource(resources, &info->busn);
+
+	list_for_each_entry(root_res, &info->resources, list)
+		pci_add_resource(resources, &root_res->res);
+
+	return;
+
+default_resources:
+	/*
+	 * We don't have any host bridge aperture information from the
+	 * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
+	 * so fall back to the defaults historically used by pci_create_bus().
+	 */
+	printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
+	pci_add_resource(resources, &ioport_resource);
+	pci_add_resource(resources, &iomem_resource);
+}
+
+struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
+						 int node, int link)
+{
+	struct pci_root_info *info;
+
+	info = kzalloc(sizeof(*info), GFP_KERNEL);
+
+	if (!info)
+		return info;
+
+	sprintf(info->name, "PCI Bus #%02x", bus_min);
+
+	INIT_LIST_HEAD(&info->resources);
+	info->busn.name  = info->name;
+	info->busn.start = bus_min;
+	info->busn.end   = bus_max;
+	info->busn.flags = IORESOURCE_BUS;
+	info->node = node;
+	info->link = link;
+
+	list_add_tail(&info->list, &pci_root_infos);
+
+	return info;
+}
+
+void update_res(struct pci_root_info *info, resource_size_t start,
+		resource_size_t end, unsigned long flags, int merge)
+{
+	struct resource *res;
+	struct pci_root_res *root_res;
+
+	if (start > end)
+		return;
+
+	if (start == MAX_RESOURCE)
+		return;
+
+	if (!merge)
+		goto addit;
+
+	/* try to merge it with old one */
+	list_for_each_entry(root_res, &info->resources, list) {
+		resource_size_t final_start, final_end;
+		resource_size_t common_start, common_end;
+
+		res = &root_res->res;
+		if (res->flags != flags)
+			continue;
+
+		common_start = max(res->start, start);
+		common_end = min(res->end, end);
+		if (common_start > common_end + 1)
+			continue;
+
+		final_start = min(res->start, start);
+		final_end = max(res->end, end);
+
+		res->start = final_start;
+		res->end = final_end;
+		return;
+	}
+
+addit:
+
+	/* need to add that */
+	root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
+	if (!root_res)
+		return;
+
+	res = &root_res->res;
+	res->name = info->name;
+	res->flags = flags;
+	res->start = start;
+	res->end = end;
+
+	list_add_tail(&root_res->list, &info->resources);
+}