projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7328c8f4 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 610929e1 | 2 | /* |
| df62ab5e | 3 | * Host bridge related code |
| 610929e1 YL |
4 | */ |
| 5 | ||
| 6 | #include <linux/kernel.h> | |
| 610929e1 YL |
7 | #include <linux/pci.h> |
| 8 | #include <linux/module.h> | |
| 9 | ||
| 10 | #include "pci.h" | |
| 11 | ||
| fc279850 | 12 | static struct pci_bus *find_pci_root_bus(struct pci_bus *bus) |
| 610929e1 | 13 | { |
| 610929e1 YL |
14 | while (bus->parent) |
| 15 | bus = bus->parent; | |
| 16 | ||
| 459f58ce YL |
17 | return bus; |
| 18 | } | |
| 19 | ||
| 3390e085 | 20 | struct pci_host_bridge *pci_find_host_bridge(struct pci_bus *bus) |
| 459f58ce | 21 | { |
| fc279850 | 22 | struct pci_bus *root_bus = find_pci_root_bus(bus); |
| 610929e1 | 23 | |
| fc279850 | 24 | return to_pci_host_bridge(root_bus->bridge); |
| 610929e1 | 25 | } |
| 59dc3325 | 26 | EXPORT_SYMBOL_GPL(pci_find_host_bridge); |
| 610929e1 | 27 | |
| 6675a601 MK |
28 | struct device *pci_get_host_bridge_device(struct pci_dev *dev) |
| 29 | { | |
| 30 | struct pci_bus *root_bus = find_pci_root_bus(dev->bus); | |
| 31 | struct device *bridge = root_bus->bridge; | |
| 32 | ||
| 33 | kobject_get(&bridge->kobj); | |
| 34 | return bridge; | |
| 35 | } | |
| 36 | ||
| 37 | void pci_put_host_bridge_device(struct device *dev) | |
| 38 | { | |
| 39 | kobject_put(&dev->kobj); | |
| 40 | } | |
| 41 | ||
| 4fa2649a YL |
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 | } | |
| 6f38a8b9 | 49 | EXPORT_SYMBOL_GPL(pci_set_host_bridge_release); |
| 4fa2649a | 50 | |
| fc279850 | 51 | void pcibios_resource_to_bus(struct pci_bus *bus, struct pci_bus_region *region, |
| 610929e1 YL |
52 | struct resource *res) |
| 53 | { | |
| 3390e085 | 54 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
| 14d76b68 | 55 | struct resource_entry *window; |
| 610929e1 YL |
56 | resource_size_t offset = 0; |
| 57 | ||
| 14d76b68 | 58 | resource_list_for_each_entry(window, &bridge->windows) { |
| 610929e1 YL |
59 | if (resource_contains(window->res, 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 | ||
| fc279850 | 76 | void pcibios_bus_to_resource(struct pci_bus *bus, struct resource *res, |
| 610929e1 YL |
77 | struct pci_bus_region *region) |
| 78 | { | |
| 3390e085 | 79 | struct pci_host_bridge *bridge = pci_find_host_bridge(bus); |
| 14d76b68 | 80 | struct resource_entry *window; |
| 610929e1 YL |
81 | resource_size_t offset = 0; |
| 82 | ||
| 14d76b68 | 83 | resource_list_for_each_entry(window, &bridge->windows) { |
| 459f58ce YL |
84 | struct pci_bus_region bus_region; |
| 85 | ||
| 610929e1 YL |
86 | if (resource_type(res) != resource_type(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(&bus_region, 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); |