1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* |
3 | * Host bridge related code |
4 | */ |
5 | |
6 | #include <linux/kernel.h> |
7 | #include <linux/pci.h> |
8 | #include <linux/module.h> |
9 | |
10 | #include "pci.h" |
11 | |
12 | static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) |
13 | { |
14 | while (bus->parent) |
15 | bus = bus->parent; |
16 | |
17 | return bus; |
18 | } |
19 | |
20 | struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) |
21 | { |
22 | struct pci_bus *root_bus = find_pci_root_bus(bus); |
23 | |
24 | return to_pci_host_bridge(root_bus->bridge); |
25 | } |
26 | EXPORT_SYMBOL_GPL(pci_find_host_bridge); |
27 | |
28 | struct device *pci_get_host_bridge_device(struct pci_dev *dev) |
29 | { |
30 | struct pci_bus *root_bus = find_pci_root_bus(bus: dev->bus); |
31 | struct device *bridge = root_bus->bridge; |
32 | |
33 | kobject_get(kobj: &bridge->kobj); |
34 | return bridge; |
35 | } |
36 | |
37 | void pci_put_host_bridge_device(struct device *dev) |
38 | { |
39 | kobject_put(kobj: &dev->kobj); |
40 | } |
41 | |
42 | void pci_set_host_bridge_release(struct pci_host_bridge *bridge, |
43 | void (*release_fn)(struct pci_host_bridge *), |
44 | void *release_data) |
45 | { |
46 | bridge->release_fn = release_fn; |
47 | bridge->release_data = release_data; |
48 | } |
49 | EXPORT_SYMBOL_GPL(pci_set_host_bridge_release); |
50 | |
51 | void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, |
52 | struct resource *res) |
53 | { |
54 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
55 | struct resource_entry *window; |
56 | resource_size_t offset = 0; |
57 | |
58 | resource_list_for_each_entry(window, &bridge->windows) { |
59 | if (resource_contains(r1: window->res, r2: res)) { |
60 | offset = window->offset; |
61 | break; |
62 | } |
63 | } |
64 | |
65 | region->start = res->start - offset; |
66 | region->end = res->end - offset; |
67 | } |
68 | EXPORT_SYMBOL(pcibios_resource_to_bus); |
69 | |
70 | static bool region_contains(struct pci_bus_region *region1, |
71 | struct pci_bus_region *region2) |
72 | { |
73 | return region1->start <= region2->start && region1->end >= region2->end; |
74 | } |
75 | |
76 | void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, |
77 | struct pci_bus_region *region) |
78 | { |
79 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
80 | struct resource_entry *window; |
81 | resource_size_t offset = 0; |
82 | |
83 | resource_list_for_each_entry(window, &bridge->windows) { |
84 | struct pci_bus_region bus_region; |
85 | |
86 | if (resource_type(res) != resource_type(res: window->res)) |
87 | continue; |
88 | |
89 | bus_region.start = window->res->start - window->offset; |
90 | bus_region.end = window->res->end - window->offset; |
91 | |
92 | if (region_contains(region1: &bus_region, region2: region)) { |
93 | offset = window->offset; |
94 | break; |
95 | } |
96 | } |
97 | |
98 | res->start = region->start + offset; |
99 | res->end = region->end + offset; |
100 | } |
101 | EXPORT_SYMBOL(pcibios_bus_to_resource); |
102 | |