1#include <linux/init.h>
2#include <linux/pci.h>
3#include <linux/range.h>
4
5#include "bus_numa.h"
6
7LIST_HEAD(pci_root_infos);
8
9static 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
20int 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
30void 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
67default_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
78struct 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
103void 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
140addit:
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