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 list_for_each_entry(info, &pci_root_infos, list)
14 if (info->busn.start == bus)
20 int x86_pci_root_bus_node(int bus)
22 struct pci_root_info *info = x86_find_pci_root_info(bus);
30 void x86_pci_root_bus_resources(int bus, struct list_head *resources)
32 struct pci_root_info *info = x86_find_pci_root_info(bus);
33 struct pci_root_res *root_res;
34 struct resource_entry *window;
38 goto default_resources;
40 printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
43 /* already added by acpi ? */
44 resource_list_for_each_entry(window, resources)
45 if (window->res->flags & IORESOURCE_BUS) {
51 pci_add_resource(resources, &info->busn);
53 list_for_each_entry(root_res, &info->resources, list)
54 pci_add_resource(resources, &root_res->res);
60 * We don't have any host bridge aperture information from the
61 * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
62 * so fall back to the defaults historically used by pci_create_bus().
64 printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
65 pci_add_resource(resources, &ioport_resource);
66 pci_add_resource(resources, &iomem_resource);
69 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
72 struct pci_root_info *info;
74 info = kzalloc(sizeof(*info), GFP_KERNEL);
79 sprintf(info->name, "PCI Bus #%02x", bus_min);
81 INIT_LIST_HEAD(&info->resources);
82 info->busn.name = info->name;
83 info->busn.start = bus_min;
84 info->busn.end = bus_max;
85 info->busn.flags = IORESOURCE_BUS;
89 list_add_tail(&info->list, &pci_root_infos);
94 void update_res(struct pci_root_info *info, resource_size_t start,
95 resource_size_t end, unsigned long flags, int merge)
98 struct pci_root_res *root_res;
103 if (start == MAX_RESOURCE)
109 /* try to merge it with old one */
110 list_for_each_entry(root_res, &info->resources, list) {
111 resource_size_t final_start, final_end;
112 resource_size_t common_start, common_end;
114 res = &root_res->res;
115 if (res->flags != flags)
118 common_start = max(res->start, start);
119 common_end = min(res->end, end);
120 if (common_start > common_end + 1)
123 final_start = min(res->start, start);
124 final_end = max(res->end, end);
126 res->start = final_start;
127 res->end = final_end;
133 /* need to add that */
134 root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
138 res = &root_res->res;
139 res->name = info->name;
144 list_add_tail(&root_res->list, &info->resources);