arch/x86/pci/bus_numa.c

   1 #include <linux/init.h>
   2 #include <linux/pci.h>
   3 #include <linux/range.h>
   4
   5 #include "bus_numa.h"
   6
   7 LIST_HEAD(pci_root_infos);
   8
   9 static struct pci_root_info *x86_find_pci_root_info(int bus)
  10 {
  11         struct pci_root_info *info;
  12
  13         if (list_empty(&pci_root_infos))
  14                 return NULL;
  15
  16         list_for_each_entry(info, &pci_root_infos, list)
  17                 if (info->busn.start == bus)
  18                         return info;
  19
  20         return NULL;
  21 }
  22
  23 void x86_pci_root_bus_resources(int bus, struct list_head *resources)
  24 {
  25         struct pci_root_info *info = x86_find_pci_root_info(bus);
  26         struct pci_root_res *root_res;
  27         struct pci_host_bridge_window *window;
  28         bool found = false;
  29
  30         if (!info)
  31                 goto default_resources;
  32
  33         printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
  34                bus);
  35
  36         /* already added by acpi ? */
  37         list_for_each_entry(window, resources, list)
  38                 if (window->res->flags & IORESOURCE_BUS) {
  39                         found = true;
  40                         break;
  41                 }
  42
  43         if (!found)
  44                 pci_add_resource(resources, &info->busn);
  45
  46         list_for_each_entry(root_res, &info->resources, list) {
  47                 struct resource *res;
  48                 struct resource *root;
  49
  50                 res = &root_res->res;
  51                 pci_add_resource(resources, res);
  52                 if (res->flags & IORESOURCE_IO)
  53                         root = &ioport_resource;
  54                 else
  55                         root = &iomem_resource;
  56                 insert_resource(root, res);
  57         }
  58         return;
  59
  60 default_resources:
  61         /*
  62          * We don't have any host bridge aperture information from the
  63          * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
  64          * so fall back to the defaults historically used by pci_create_bus().
  65          */
  66         printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
  67         pci_add_resource(resources, &ioport_resource);
  68         pci_add_resource(resources, &iomem_resource);
  69 }
  70
  71 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
  72                                                  int node, int link)
  73 {
  74         struct pci_root_info *info;
  75
  76         info = kzalloc(sizeof(*info), GFP_KERNEL);
  77
  78         if (!info)
  79                 return info;
  80
  81         sprintf(info->name, "PCI Bus #%02x", bus_min);
  82
  83         INIT_LIST_HEAD(&info->resources);
  84         info->busn.name  = info->name;
  85         info->busn.start = bus_min;
  86         info->busn.end   = bus_max;
  87         info->busn.flags = IORESOURCE_BUS;
  88         info->node = node;
  89         info->link = link;
  90
  91         list_add_tail(&info->list, &pci_root_infos);
  92
  93         return info;
  94 }
  95
  96 void update_res(struct pci_root_info *info, resource_size_t start,
  97                 resource_size_t end, unsigned long flags, int merge)
  98 {
  99         struct resource *res;
 100         struct pci_root_res *root_res;
 101
 102         if (start > end)
 103                 return;
 104
 105         if (start == MAX_RESOURCE)
 106                 return;
 107
 108         if (!merge)
 109                 goto addit;
 110
 111         /* try to merge it with old one */
 112         list_for_each_entry(root_res, &info->resources, list) {
 113                 resource_size_t final_start, final_end;
 114                 resource_size_t common_start, common_end;
 115
 116                 res = &root_res->res;
 117                 if (res->flags != flags)
 118                         continue;
 119
 120                 common_start = max(res->start, start);
 121                 common_end = min(res->end, end);
 122                 if (common_start > common_end + 1)
 123                         continue;
 124
 125                 final_start = min(res->start, start);
 126                 final_end = max(res->end, end);
 127
 128                 res->start = final_start;
 129                 res->end = final_end;
 130                 return;
 131         }
 132
 133 addit:
 134
 135         /* need to add that */
 136         root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
 137         if (!root_res)
 138                 return;
 139
 140         res = &root_res->res;
 141         res->name = info->name;
 142         res->flags = flags;
 143         res->start = start;
 144         res->end = end;
 145
 146         list_add_tail(&root_res->list, &info->resources);
 147 }