cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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host-bridge.c (2462B)

      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
     12static 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
     20struct 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}
     26EXPORT_SYMBOL_GPL(pci_find_host_bridge);
     27
     28struct 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
     37void  pci_put_host_bridge_device(struct device *dev)
     38{
     39	kobject_put(&dev->kobj);
     40}
     41
     42void 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}
     49EXPORT_SYMBOL_GPL(pci_set_host_bridge_release);
     50
     51void 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(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}
     68EXPORT_SYMBOL(pcibios_resource_to_bus);
     69
     70static 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
     76void 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(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}
    101EXPORT_SYMBOL(pcibios_bus_to_resource);