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1// SPDX-License-Identifier: GPL-2.0
2#include <linux/init.h>
3#include <linux/pci.h>
4#include <linux/range.h>
5
6#include "bus_numa.h"
7
8LIST_HEAD(pci_root_infos);
9
10static struct pci_root_info *x86_find_pci_root_info(int bus)
11{
12 struct pci_root_info *info;
13
14 list_for_each_entry(info, &pci_root_infos, list)
15 if (info->busn.start == bus)
16 return info;
17
18 return NULL;
19}
20
21int x86_pci_root_bus_node(int bus)
22{
23 struct pci_root_info *info = x86_find_pci_root_info(bus);
24
25 if (!info)
26 return NUMA_NO_NODE;
27
28 return info->node;
29}
30
31void x86_pci_root_bus_resources(int bus, struct list_head *resources)
32{
33 struct pci_root_info *info = x86_find_pci_root_info(bus);
34 struct pci_root_res *root_res;
35 struct resource_entry *window;
36 bool found = false;
37
38 if (!info)
39 goto default_resources;
40
41 printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
42 bus);
43
44 /* already added by acpi ? */
45 resource_list_for_each_entry(window, resources)
46 if (window->res->flags & IORESOURCE_BUS) {
47 found = true;
48 break;
49 }
50
51 if (!found)
52 pci_add_resource(resources, &info->busn);
53
54 list_for_each_entry(root_res, &info->resources, list)
55 pci_add_resource(resources, &root_res->res);
56
57 return;
58
59default_resources:
60 /*
61 * We don't have any host bridge aperture information from the
62 * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
63 * so fall back to the defaults historically used by pci_create_bus().
64 */
65 printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
66 pci_add_resource(resources, &ioport_resource);
67 pci_add_resource(resources, &iomem_resource);
68}
69
70struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
71 int node, int link)
72{
73 struct pci_root_info *info;
74
75 info = kzalloc(sizeof(*info), GFP_KERNEL);
76
77 if (!info)
78 return info;
79
80 sprintf(info->name, "PCI Bus #%02x", bus_min);
81
82 INIT_LIST_HEAD(&info->resources);
83 info->busn.name = info->name;
84 info->busn.start = bus_min;
85 info->busn.end = bus_max;
86 info->busn.flags = IORESOURCE_BUS;
87 info->node = node;
88 info->link = link;
89
90 list_add_tail(&info->list, &pci_root_infos);
91
92 return info;
93}
94
95void update_res(struct pci_root_info *info, resource_size_t start,
96 resource_size_t end, unsigned long flags, int merge)
97{
98 struct resource *res;
99 struct pci_root_res *root_res;
100
101 if (start > end)
102 return;
103
104 if (start == RESOURCE_SIZE_MAX)
105 return;
106
107 if (!merge)
108 goto addit;
109
110 /* try to merge it with old one */
111 list_for_each_entry(root_res, &info->resources, list) {
112 resource_size_t final_start, final_end;
113 resource_size_t common_start, common_end;
114
115 res = &root_res->res;
116 if (res->flags != flags)
117 continue;
118
119 common_start = max(res->start, start);
120 common_end = min(res->end, end);
121 if (common_start > common_end + 1)
122 continue;
123
124 final_start = min(res->start, start);
125 final_end = max(res->end, end);
126
127 res->start = final_start;
128 res->end = final_end;
129 return;
130 }
131
132addit:
133
134 /* need to add that */
135 root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
136 if (!root_res)
137 return;
138
139 res = &root_res->res;
140 res->name = info->name;
141 res->flags = flags;
142 res->start = start;
143 res->end = end;
144
145 list_add_tail(&root_res->list, &info->resources);
146}
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 pci_add_resource(resources, &root_res->res);
55
56 return;
57
58default_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
69struct 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
94void 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
131addit:
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}