arch/x86/pci/bus_numa.c

   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
   8 LIST_HEAD(pci_root_infos);
   9
  10 static 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
  21 int 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
  31 void 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
  59 default_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
  70 struct 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
  95 void 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
 132 addit:
 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 }