1 files changed, 55 insertions, 26 deletions

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index 0cfebecf2a8f..654a2234f8f3 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -209,7 +209,7 @@ static int __init pci_mmcfg_check_hostbridge(void)
         return name != NULL;
 }
 
-static void __init pci_mmcfg_insert_resources(unsigned long resource_flags)
+static void __init pci_mmcfg_insert_resources(void)
 {
 #define PCI_MMCFG_RESOURCE_NAME_LEN 19
         int i;
@@ -233,7 +233,7 @@ static void __init pci_mmcfg_insert_resources(unsigned long resource_flags)
                          cfg->pci_segment);
                 res->start = cfg->address;
                 res->end = res->start + (num_buses << 20) - 1;
-                res->flags = IORESOURCE_MEM | resource_flags;
+                res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
                 insert_resource(&iomem_resource, res);
                 names += PCI_MMCFG_RESOURCE_NAME_LEN;
         }
@@ -293,7 +293,7 @@ static acpi_status __init find_mboard_resource(acpi_handle handle, u32 lvl,
         return AE_OK;
 }
 
-static int __init is_acpi_reserved(unsigned long start, unsigned long end)
+static int __init is_acpi_reserved(u64 start, u64 end, unsigned not_used)
 {
         struct resource mcfg_res;
 
@@ -310,6 +310,41 @@ static int __init is_acpi_reserved(unsigned long start, unsigned long end)
         return mcfg_res.flags;
 }
 
+typedef int (*check_reserved_t)(u64 start, u64 end, unsigned type);
+
+static int __init is_mmconf_reserved(check_reserved_t is_reserved,
+                u64 addr, u64 size, int i,
+                typeof(pci_mmcfg_config[0]) *cfg, int with_e820)
+{
+        u64 old_size = size;
+        int valid = 0;
+
+        while (!is_reserved(addr, addr + size - 1, E820_RESERVED)) {
+                size >>= 1;
+                if (size < (16UL<<20))
+                        break;
+        }
+
+        if (size >= (16UL<<20) || size == old_size) {
+                printk(KERN_NOTICE
+                       "PCI: MCFG area at %Lx reserved in %s\n",
+                        addr, with_e820?"E820":"ACPI motherboard resources");
+                valid = 1;
+
+                if (old_size != size) {
+                        /* update end_bus_number */
+                        cfg->end_bus_number = cfg->start_bus_number + ((size>>20) - 1);
+                        printk(KERN_NOTICE "PCI: updated MCFG configuration %d: base %lx "
+                               "segment %hu buses %u - %u\n",
+                               i, (unsigned long)cfg->address, cfg->pci_segment,
+                               (unsigned int)cfg->start_bus_number,
+                               (unsigned int)cfg->end_bus_number);
+                }
+        }
+
+        return valid;
+}
+
 static void __init pci_mmcfg_reject_broken(int early)
 {
         typeof(pci_mmcfg_config[0]) *cfg;
@@ -324,21 +359,22 @@ static void __init pci_mmcfg_reject_broken(int early)
 
         for (i = 0; i < pci_mmcfg_config_num; i++) {
                 int valid = 0;
-                u32 size = (cfg->end_bus_number + 1) << 20;
+                u64 addr, size;
+
                 cfg = &pci_mmcfg_config[i];
+                addr = cfg->start_bus_number;
+                addr <<= 20;
+                addr += cfg->address;
+                size = cfg->end_bus_number + 1 - cfg->start_bus_number;
+                size <<= 20;
                 printk(KERN_NOTICE "PCI: MCFG configuration %d: base %lx "
                        "segment %hu buses %u - %u\n",
                        i, (unsigned long)cfg->address, cfg->pci_segment,
                        (unsigned int)cfg->start_bus_number,
                        (unsigned int)cfg->end_bus_number);
 
-                if (!early &&
-                    is_acpi_reserved(cfg->address, cfg->address + size - 1)) {
-                        printk(KERN_NOTICE "PCI: MCFG area at %Lx reserved "
-                               "in ACPI motherboard resources\n",
-                               cfg->address);
-                        valid = 1;
-                }
+                if (!early)
+                        valid = is_mmconf_reserved(is_acpi_reserved, addr, size, i, cfg, 0);
 
                 if (valid)
                         continue;
@@ -347,16 +383,11 @@ static void __init pci_mmcfg_reject_broken(int early)
                         printk(KERN_ERR "PCI: BIOS Bug: MCFG area at %Lx is not"
                                " reserved in ACPI motherboard resources\n",
                                cfg->address);
+
                 /* Don't try to do this check unless configuration
                    type 1 is available. how about type 2 ?*/
-                if (raw_pci_ops && e820_all_mapped(cfg->address,
-                                                  cfg->address + size - 1,
-                                                  E820_RESERVED)) {
-                        printk(KERN_NOTICE
-                               "PCI: MCFG area at %Lx reserved in E820\n",
-                               cfg->address);
-                        valid = 1;
-                }
+                if (raw_pci_ops)
+                        valid = is_mmconf_reserved(e820_all_mapped, addr, size, i, cfg, 1);
 
                 if (!valid)
                         goto reject;
@@ -365,7 +396,7 @@ static void __init pci_mmcfg_reject_broken(int early)
         return;
 
 reject:
-        printk(KERN_ERR "PCI: Not using MMCONFIG.\n");
+        printk(KERN_INFO "PCI: Not using MMCONFIG.\n");
         pci_mmcfg_arch_free();
         kfree(pci_mmcfg_config);
         pci_mmcfg_config = NULL;
@@ -374,7 +405,7 @@ reject:
 
 static int __initdata known_bridge;
 
-void __init __pci_mmcfg_init(int early)
+static void __init __pci_mmcfg_init(int early)
 {
         /* MMCONFIG disabled */
         if ((pci_probe & PCI_PROBE_MMCONF) == 0)
@@ -403,11 +434,9 @@ void __init __pci_mmcfg_init(int early)
             (pci_mmcfg_config[0].address == 0))
                 return;
 
-        if (pci_mmcfg_arch_init()) {
-                if (known_bridge)
-                        pci_mmcfg_insert_resources(IORESOURCE_BUSY);
+        if (pci_mmcfg_arch_init())
                 pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
-        } else {
+        else {
                 /*
                  * Signal not to attempt to insert mmcfg resources because
                  * the architecture mmcfg setup could not initialize.
@@ -444,7 +473,7 @@ static int __init pci_mmcfg_late_insert_resources(void)
          * marked so it won't cause request errors when __request_region is
          * called.
          */
-        pci_mmcfg_insert_resources(0);
+        pci_mmcfg_insert_resources();
 
         return 0;
 }