Merge branch 'acpi-ec'
[linux-drm-fsl-dcu.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                 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
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
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 }