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         list_for_each_entry(info, &pci_root_infos, list)
  14                 if (info->busn.start == bus)
  15                         return info;
  16
  17         return NULL;
  18 }
  19
  20 int x86_pci_root_bus_node(int bus)
  21 {
  22         struct pci_root_info *info = x86_find_pci_root_info(bus);
  23
  24         if (!info)
  25                 return NUMA_NO_NODE;
  26
  27         return info->node;
  28 }
  29
  30 void x86_pci_root_bus_resources(int bus, struct list_head *resources)
  31 {
  32         struct pci_root_info *info = x86_find_pci_root_info(bus);
  33         struct pci_root_res *root_res;
  34         struct resource_entry *window;
  35         bool found = false;
  36
  37         if (!info)
  38                 goto default_resources;
  39
  40         printk(KERN_DEBUG "PCI: root bus %02x: hardware-probed resources\n",
  41                bus);
  42
  43         /* already added by acpi ? */
  44         resource_list_for_each_entry(window, resources)
  45                 if (window->res->flags & IORESOURCE_BUS) {
  46                         found = true;
  47                         break;
  48                 }
  49
  50         if (!found)
  51                 pci_add_resource(resources, &info->busn);
  52
  53         list_for_each_entry(root_res, &info->resources, list)
  54                 pci_add_resource(resources, &root_res->res);
  55
  56         return;
  57
  58 default_resources:
  59         /*
  60          * We don't have any host bridge aperture information from the
  61          * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
  62          * so fall back to the defaults historically used by pci_create_bus().
  63          */
  64         printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
  65         pci_add_resource(resources, &ioport_resource);
  66         pci_add_resource(resources, &iomem_resource);
  67 }
  68
  69 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
  70                                                  int node, int link)
  71 {
  72         struct pci_root_info *info;
  73
  74         info = kzalloc(sizeof(*info), GFP_KERNEL);
  75
  76         if (!info)
  77                 return info;
  78
  79         sprintf(info->name, "PCI Bus #%02x", bus_min);
  80
  81         INIT_LIST_HEAD(&info->resources);
  82         info->busn.name  = info->name;
  83         info->busn.start = bus_min;
  84         info->busn.end   = bus_max;
  85         info->busn.flags = IORESOURCE_BUS;
  86         info->node = node;
  87         info->link = link;
  88
  89         list_add_tail(&info->list, &pci_root_infos);
  90
  91         return info;
  92 }
  93
  94 void update_res(struct pci_root_info *info, resource_size_t start,
  95                 resource_size_t end, unsigned long flags, int merge)
  96 {
  97         struct resource *res;
  98         struct pci_root_res *root_res;
  99
 100         if (start > end)
 101                 return;
 102
 103         if (start == MAX_RESOURCE)
 104                 return;
 105
 106         if (!merge)
 107                 goto addit;
 108
 109         /* try to merge it with old one */
 110         list_for_each_entry(root_res, &info->resources, list) {
 111                 resource_size_t final_start, final_end;
 112                 resource_size_t common_start, common_end;
 113
 114                 res = &root_res->res;
 115                 if (res->flags != flags)
 116                         continue;
 117
 118                 common_start = max(res->start, start);
 119                 common_end = min(res->end, end);
 120                 if (common_start > common_end + 1)
 121                         continue;
 122
 123                 final_start = min(res->start, start);
 124                 final_end = max(res->end, end);
 125
 126                 res->start = final_start;
 127                 res->end = final_end;
 128                 return;
 129         }
 130
 131 addit:
 132
 133         /* need to add that */
 134         root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
 135         if (!root_res)
 136                 return;
 137
 138         res = &root_res->res;
 139         res->name = info->name;
 140         res->flags = flags;
 141         res->start = start;
 142         res->end = end;
 143
 144         list_add_tail(&root_res->list, &info->resources);
 145 }