[PATCH] mmconfig: Reserve resources but only when we're sure about them.

Put back the resource reservation as per
4c6e052adfe285ede5884e4e8c4d33af33932c13 but use it *only* when the range(s)
come from a chipset probe instead of the bios.

Signed-off-by: Olivier Galibert <galibert@pobox.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Cc: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>

1 files changed, 33 insertions, 0 deletions

diff --git a/arch/i386/pci/mmconfig-shared.c b/arch/i386/pci/mmconfig-shared.c
index d72f0439147c..4757554b08cf 100644
--- a/arch/i386/pci/mmconfig-shared.c
+++ b/arch/i386/pci/mmconfig-shared.c
@@ -166,6 +166,37 @@ static int __init pci_mmcfg_check_hostbridge(void)
         return name != NULL;
 }
 
+static __init void pci_mmcfg_insert_resources(void)
+{
+#define PCI_MMCFG_RESOURCE_NAME_LEN 19
+        int i;
+        struct resource *res;
+        char *names;
+        unsigned num_buses;
+
+        res = kcalloc(PCI_MMCFG_RESOURCE_NAME_LEN + sizeof(*res),
+                        pci_mmcfg_config_num, GFP_KERNEL);
+
+        if (!res) {
+                printk(KERN_ERR "PCI: Unable to allocate MMCONFIG resources\n");
+                return;
+        }
+
+        names = (void *)&res[pci_mmcfg_config_num];
+        for (i = 0; i < pci_mmcfg_config_num; i++, res++) {
+                num_buses = pci_mmcfg_config[i].end_bus_number -
+                    pci_mmcfg_config[i].start_bus_number + 1;
+                res->name = names;
+                snprintf(names, PCI_MMCFG_RESOURCE_NAME_LEN, "PCI MMCONFIG %u",
+                        pci_mmcfg_config[i].pci_segment);
+                res->start = pci_mmcfg_config[i].address;
+                res->end = res->start + (num_buses << 20) - 1;
+                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+                insert_resource(&iomem_resource, res);
+                names += PCI_MMCFG_RESOURCE_NAME_LEN;
+        }
+}
+
 void __init pci_mmcfg_init(int type)
 {
         int known_bridge = 0;
@@ -199,6 +230,8 @@ void __init pci_mmcfg_init(int type)
         if (pci_mmcfg_arch_init()) {
                 if (type == 1)
                         unreachable_devices();
+                if (known_bridge)
+                        pci_mmcfg_insert_resources();
                 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
         }
 }