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 pci_host_bridge_window *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         list_for_each_entry(window, resources, list)
  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                 struct resource *res;
  55                 struct resource *root;
  56
  57                 res = &root_res->res;
  58                 pci_add_resource(resources, res);
  59                 if (res->flags & IORESOURCE_IO)
  60                         root = &ioport_resource;
  61                 else
  62                         root = &iomem_resource;
  63                 insert_resource(root, res);
  64         }
  65         return;
  66
  67 default_resources:
  68         /*
  69          * We don't have any host bridge aperture information from the
  70          * "native host bridge drivers," e.g., amd_bus or broadcom_bus,
  71          * so fall back to the defaults historically used by pci_create_bus().
  72          */
  73         printk(KERN_DEBUG "PCI: root bus %02x: using default resources\n", bus);
  74         pci_add_resource(resources, &ioport_resource);
  75         pci_add_resource(resources, &iomem_resource);
  76 }
  77
  78 struct pci_root_info __init *alloc_pci_root_info(int bus_min, int bus_max,
  79                                                  int node, int link)
  80 {
  81         struct pci_root_info *info;
  82
  83         info = kzalloc(sizeof(*info), GFP_KERNEL);
  84
  85         if (!info)
  86                 return info;
  87
  88         sprintf(info->name, "PCI Bus #%02x", bus_min);
  89
  90         INIT_LIST_HEAD(&info->resources);
  91         info->busn.name  = info->name;
  92         info->busn.start = bus_min;
  93         info->busn.end   = bus_max;
  94         info->busn.flags = IORESOURCE_BUS;
  95         info->node = node;
  96         info->link = link;
  97
  98         list_add_tail(&info->list, &pci_root_infos);
  99
 100         return info;
 101 }
 102
 103 void update_res(struct pci_root_info *info, resource_size_t start,
 104                 resource_size_t end, unsigned long flags, int merge)
 105 {
 106         struct resource *res;
 107         struct pci_root_res *root_res;
 108
 109         if (start > end)
 110                 return;
 111
 112         if (start == MAX_RESOURCE)
 113                 return;
 114
 115         if (!merge)
 116                 goto addit;
 117
 118         /* try to merge it with old one */
 119         list_for_each_entry(root_res, &info->resources, list) {
 120                 resource_size_t final_start, final_end;
 121                 resource_size_t common_start, common_end;
 122
 123                 res = &root_res->res;
 124                 if (res->flags != flags)
 125                         continue;
 126
 127                 common_start = max(res->start, start);
 128                 common_end = min(res->end, end);
 129                 if (common_start > common_end + 1)
 130                         continue;
 131
 132                 final_start = min(res->start, start);
 133                 final_end = max(res->end, end);
 134
 135                 res->start = final_start;
 136                 res->end = final_end;
 137                 return;
 138         }
 139
 140 addit:
 141
 142         /* need to add that */
 143         root_res = kzalloc(sizeof(*root_res), GFP_KERNEL);
 144         if (!root_res)
 145                 return;
 146
 147         res = &root_res->res;
 148         res->name = info->name;
 149         res->flags = flags;
 150         res->start = start;
 151         res->end = end;
 152
 153         list_add_tail(&root_res->list, &info->resources);
 154 }