6eb3c8af96e23678f16378858d05d435e12199fd
[sfrench/cifs-2.6.git] / arch / x86 / pci / bus_numa.c
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
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
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
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 resource_entry *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         resource_list_for_each_entry(window, resources)
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                 pci_add_resource(resources, &root_res->res);
55
56         return;
57
58 default_resources:
59         /*
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().
63          */
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);
67 }
68
69 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
70                                                  int node, int link)
71 {
72         struct pci_root_info *info;
73
74         info = kzalloc(sizeof(*info), GFP_KERNEL);
75
76         if (!info)
77                 return info;
78
79         sprintf(info->name, "PCI Bus #%02x", bus_min);
80
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;
86         info->node = node;
87         info->link = link;
88
89         list_add_tail(&info->list, &pci_root_infos);
90
91         return info;
92 }
93
94 void update_res(struct pci_root_info *info, resource_size_t start,
95                 resource_size_t end, unsigned long flags, int merge)
96 {
97         struct resource *res;
98         struct pci_root_res *root_res;
99
100         if (start > end)
101                 return;
102
103         if (start == MAX_RESOURCE)
104                 return;
105
106         if (!merge)
107                 goto addit;
108
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;
113
114                 res = &root_res->res;
115                 if (res->flags != flags)
116                         continue;
117
118                 common_start = max(res->start, start);
119                 common_end = min(res->end, end);
120                 if (common_start > common_end + 1)
121                         continue;
122
123                 final_start = min(res->start, start);
124                 final_end = max(res->end, end);
125
126                 res->start = final_start;
127                 res->end = final_end;
128                 return;
129         }
130
131 addit:
132
133         /* need to add that */
134         root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
135         if (!root_res)
136                 return;
137
138         res = &root_res->res;
139         res->name = info->name;
140         res->flags = flags;
141         res->start = start;
142         res->end = end;
143
144         list_add_tail(&root_res->list, &info->resources);
145 }