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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bus_numa.c (3177B)

      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 == MAX_RESOURCE)
    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}