x86/PCI: dynamically allocate pci_root_info for native host bridge drivers

This dynamically allocates struct pci_root_info instead of using a
static array.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

1 files changed, 27 insertions, 49 deletions

diff --git a/arch/x86/pci/amd_bus.c b/arch/x86/pci/amd_bus.c
index 0567df3890e1..459a7316375c 100644
--- a/arch/x86/pci/amd_bus.c
+++ b/arch/x86/pci/amd_bus.c
@@ -32,6 +32,18 @@ static struct pci_hostbridge_probe pci_probes[] __initdata = {
 
 #define RANGE_NUM 16
 
+static struct pci_root_info __init *find_pci_root_info(int node, int link)
+{
+        struct pci_root_info *info;
+
+        /* find the position */
+        list_for_each_entry(info, &pci_root_infos, list)
+                if (info->node == node && info->link == link)
+                        return info;
+
+        return NULL;
+}
+
 /**
  * early_fill_mp_bus_to_node()
  * called before pcibios_scan_root and pci_scan_bus
@@ -50,7 +62,6 @@ static int __init early_fill_mp_bus_info(void)
         int def_link;
         struct pci_root_info *info;
         u32 reg;
-        struct resource *res;
         u64 start;
         u64 end;
         struct range range[RANGE_NUM];
@@ -86,7 +97,6 @@ static int __init early_fill_mp_bus_info(void)
         if (!found)
                 return 0;
 
-        pci_root_num = 0;
         for (i = 0; i < 4; i++) {
                 int min_bus;
                 int max_bus;
@@ -105,13 +115,8 @@ static int __init early_fill_mp_bus_info(void)
 #endif
                 link = (reg >> 8) & 0x03;
 
-                info = &pci_root_info[pci_root_num];
-                info->bus_min = min_bus;
-                info->bus_max = max_bus;
-                info->node = node;
-                info->link = link;
+                info = alloc_pci_root_info(min_bus, max_bus, node, link);
                 sprintf(info->name, "PCI Bus #%02x", min_bus);
-                pci_root_num++;
         }
 
         /* get the default node and link for left over res */
@@ -134,16 +139,10 @@ static int __init early_fill_mp_bus_info(void)
                 link = (reg >> 4) & 0x03;
                 end = (reg & 0xfff000) | 0xfff;
 
-                /* find the position */
-                for (j = 0; j < pci_root_num; j++) {
-                        info = &pci_root_info[j];
-                        if (info->node == node && info->link == link)
-                                break;
-                }
-                if (j == pci_root_num)
+                info = find_pci_root_info(node, link);
+                if (!info)
                         continue; /* not found */
 
-                info = &pci_root_info[j];
                 printk(KERN_DEBUG "node %d link %d: io port [%llx, %llx]\n",
                        node, link, start, end);
 
@@ -155,13 +154,8 @@ static int __init early_fill_mp_bus_info(void)
         }
         /* add left over io port range to def node/link, [0, 0xffff] */
         /* find the position */
-        for (j = 0; j < pci_root_num; j++) {
-                info = &pci_root_info[j];
-                if (info->node == def_node && info->link == def_link)
-                        break;
-        }
-        if (j < pci_root_num) {
-                info = &pci_root_info[j];
+        info = find_pci_root_info(def_node, def_link);
+        if (info) {
                 for (i = 0; i < RANGE_NUM; i++) {
                         if (!range[i].end)
                                 continue;
@@ -214,16 +208,10 @@ static int __init early_fill_mp_bus_info(void)
                 end <<= 8;
                 end |= 0xffff;
 
-                /* find the position */
-                for (j = 0; j < pci_root_num; j++) {
-                        info = &pci_root_info[j];
-                        if (info->node == node && info->link == link)
-                                break;
-                }
-                if (j == pci_root_num)
-                        continue; /* not found */
+                info = find_pci_root_info(node, link);
 
-                info = &pci_root_info[j];
+                if (!info)
+                        continue;
 
                 printk(KERN_DEBUG "node %d link %d: mmio [%llx, %llx]",
                        node, link, start, end);
@@ -291,14 +279,8 @@ static int __init early_fill_mp_bus_info(void)
          * add left over mmio range to def node/link ?
          * that is tricky, just record range in from start_min to 4G
          */
-        for (j = 0; j < pci_root_num; j++) {
-                info = &pci_root_info[j];
-                if (info->node == def_node && info->link == def_link)
-                        break;
-        }
-        if (j < pci_root_num) {
-                info = &pci_root_info[j];
-
+        info = find_pci_root_info(def_node, def_link);
+        if (info) {
                 for (i = 0; i < RANGE_NUM; i++) {
                         if (!range[i].end)
                                 continue;
@@ -309,20 +291,16 @@ static int __init early_fill_mp_bus_info(void)
                 }
         }
 
-        for (i = 0; i < pci_root_num; i++) {
-                int res_num;
+        list_for_each_entry(info, &pci_root_infos, list) {
                 int busnum;
+                struct pci_root_res *root_res;
 
-                info = &pci_root_info[i];
-                res_num = info->res_num;
                 busnum = info->bus_min;
                 printk(KERN_DEBUG "bus: [%02x, %02x] on node %x link %x\n",
                        info->bus_min, info->bus_max, info->node, info->link);
-                for (j = 0; j < res_num; j++) {
-                        res = &info->res[j];
-                        printk(KERN_DEBUG "bus: %02x index %x %pR\n",
-                                       busnum, j, res);
-                }
+                list_for_each_entry(root_res, &info->resources, list)
+                        printk(KERN_DEBUG "bus: %02x %pR\n",
+                                       busnum, &root_res->res);
         }
 
         return 0;