1 #include <linux/init.h>
3 #include <linux/range.h>
7 LIST_HEAD(pci_root_infos);
9 static struct pci_root_info *x86_find_pci_root_info(int bus)
11 struct pci_root_info *info;
13 if (list_empty(&pci_root_infos))
16 list_for_each_entry(info, &pci_root_infos, list)
17 if (info->busn.start == bus)
23 void x86_pci_root_bus_resources(int bus, struct list_head *resources)
25 struct pci_root_info *info = x86_find_pci_root_info(bus);
26 struct pci_root_res *root_res;
27 struct pci_host_bridge_window *window;
31 goto default_resources;
33 printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
36 /* already added by acpi ? */
37 list_for_each_entry(window, resources, list)
38 if (window->res->flags & IORESOURCE_BUS) {
44 pci_add_resource(resources, &info->busn);
46 list_for_each_entry(root_res, &info->resources, list) {
48 struct resource *root;
51 pci_add_resource(resources, res);
52 if (res->flags & IORESOURCE_IO)
53 root = &ioport_resource;
55 root = &iomem_resource;
56 insert_resource(root, res);
62 * We don't have any host bridge aperture information from the
63 * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
64 * so fall back to the defaults historically used by pci_create_bus().
66 printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
67 pci_add_resource(resources, &ioport_resource);
68 pci_add_resource(resources, &iomem_resource);
71 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
74 struct pci_root_info *info;
76 info = kzalloc(sizeof(*info), GFP_KERNEL);
81 sprintf(info->name, "PCI Bus #%02x", bus_min);
83 INIT_LIST_HEAD(&info->resources);
84 info->busn.name = info->name;
85 info->busn.start = bus_min;
86 info->busn.end = bus_max;
87 info->busn.flags = IORESOURCE_BUS;
91 list_add_tail(&info->list, &pci_root_infos);
96 void update_res(struct pci_root_info *info, resource_size_t start,
97 resource_size_t end, unsigned long flags, int merge)
100 struct pci_root_res *root_res;
105 if (start == MAX_RESOURCE)
111 /* try to merge it with old one */
112 list_for_each_entry(root_res, &info->resources, list) {
113 resource_size_t final_start, final_end;
114 resource_size_t common_start, common_end;
116 res = &root_res->res;
117 if (res->flags != flags)
120 common_start = max(res->start, start);
121 common_end = min(res->end, end);
122 if (common_start > common_end + 1)
125 final_start = min(res->start, start);
126 final_end = max(res->end, end);
128 res->start = final_start;
129 res->end = final_end;
135 /* need to add that */
136 root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
140 res = &root_res->res;
141 res->name = info->name;
146 list_add_tail(&root_res->list, &info->resources);