1 #include <linux/init.h>
2 #include <linux/pci.h>
3 #include <linux/range.h>
4
5 #include "bus_numa.h"
6
7 LIST_HEAD(pci_root_infos);
8
x86_find_pci_root_info(int bus)9 static struct pci_root_info *x86_find_pci_root_info(int bus)
10 {
11 struct pci_root_info *info;
12
13 list_for_each_entry(info, &pci_root_infos, list)
14 if (info->busn.start == bus)
15 return info;
16
17 return NULL;
18 }
19
x86_pci_root_bus_node(int bus)20 int x86_pci_root_bus_node(int bus)
21 {
22 struct pci_root_info *info = x86_find_pci_root_info(bus);
23
24 if (!info)
25 return NUMA_NO_NODE;
26
27 return info->node;
28 }
29
x86_pci_root_bus_resources(int bus,struct list_head * resources)30 void x86_pci_root_bus_resources(int bus, struct list_head *resources)
31 {
32 struct pci_root_info *info = x86_find_pci_root_info(bus);
33 struct pci_root_res *root_res;
34 struct pci_host_bridge_window *window;
35 bool found = false;
36
37 if (!info)
38 goto default_resources;
39
40 printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
41 bus);
42
43 /* already added by acpi ? */
44 list_for_each_entry(window, resources, list)
45 if (window->res->flags & IORESOURCE_BUS) {
46 found = true;
47 break;
48 }
49
50 if (!found)
51 pci_add_resource(resources, &info->busn);
52
53 list_for_each_entry(root_res, &info->resources, list) {
54 struct resource *res;
55 struct resource *root;
56
57 res = &root_res->res;
58 pci_add_resource(resources, res);
59 if (res->flags & IORESOURCE_IO)
60 root = &ioport_resource;
61 else
62 root = &iomem_resource;
63 insert_resource(root, res);
64 }
65 return;
66
67 default_resources:
68 /*
69 * We don't have any host bridge aperture information from the
70 * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
71 * so fall back to the defaults historically used by pci_create_bus().
72 */
73 printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
74 pci_add_resource(resources, &ioport_resource);
75 pci_add_resource(resources, &iomem_resource);
76 }
77
alloc_pci_root_info(int bus_min,int bus_max,int node,int link)78 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
79 int node, int link)
80 {
81 struct pci_root_info *info;
82
83 info = kzalloc(sizeof(*info), GFP_KERNEL);
84
85 if (!info)
86 return info;
87
88 sprintf(info->name, "PCI Bus #%02x", bus_min);
89
90 INIT_LIST_HEAD(&info->resources);
91 info->busn.name = info->name;
92 info->busn.start = bus_min;
93 info->busn.end = bus_max;
94 info->busn.flags = IORESOURCE_BUS;
95 info->node = node;
96 info->link = link;
97
98 list_add_tail(&info->list, &pci_root_infos);
99
100 return info;
101 }
102
update_res(struct pci_root_info * info,resource_size_t start,resource_size_t end,unsigned long flags,int merge)103 void update_res(struct pci_root_info *info, resource_size_t start,
104 resource_size_t end, unsigned long flags, int merge)
105 {
106 struct resource *res;
107 struct pci_root_res *root_res;
108
109 if (start > end)
110 return;
111
112 if (start == MAX_RESOURCE)
113 return;
114
115 if (!merge)
116 goto addit;
117
118 /* try to merge it with old one */
119 list_for_each_entry(root_res, &info->resources, list) {
120 resource_size_t final_start, final_end;
121 resource_size_t common_start, common_end;
122
123 res = &root_res->res;
124 if (res->flags != flags)
125 continue;
126
127 common_start = max(res->start, start);
128 common_end = min(res->end, end);
129 if (common_start > common_end + 1)
130 continue;
131
132 final_start = min(res->start, start);
133 final_end = max(res->end, end);
134
135 res->start = final_start;
136 res->end = final_end;
137 return;
138 }
139
140 addit:
141
142 /* need to add that */
143 root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
144 if (!root_res)
145 return;
146
147 res = &root_res->res;
148 res->name = info->name;
149 res->flags = flags;
150 res->start = start;
151 res->end = end;
152
153 list_add_tail(&root_res->list, &info->resources);
154 }
155