Fix x86-64 AGPGART/IOMMU compilation.

arch/x86_64/kernel/pci-gart.c

@@ -72,6 +72,7 @@ static unsigned long *iommu_gart_bitmap; /* guarded by iommu_bitmap_lock */
 #define EMERGENCY_PAGES 32 /* = 128KB */ 
 
 #ifdef CONFIG_AGP
+extern int agp_amdk8_init(void);
 extern int agp_init(void);
 #define AGPEXTERN extern
 #else
@@ -453,10 +454,14 @@ void __init pci_iommu_init(void)
 	unsigned long aper_size;
 	unsigned long iommu_start;
 		
-#ifndef CONFIG_AGP
+#ifndef CONFIG_AGP_AMD_8151
 	no_agp = 1; 
 #else
-	no_agp = no_agp || (agp_init() < 0) || (agp_copy_info(&info) < 0); 
+	/* Add other K8 AGP bridge drivers here */
+	no_agp = no_agp ||
+			(agp_init() < 0) ||
+			(agp_amdk8_init() < 0) ||
+			(agp_copy_info(&info) < 0);
 #endif	
 
 	if (no_iommu || (!force_mmu && end_pfn < 0xffffffff>>PAGE_SHIFT)) { 

drivers/char/agp/amd-k8-agp.c

@@ -8,6 +8,12 @@
  * removed now).
  */ 
 
+/*
+ * On x86-64 the AGP driver needs to be initialized early by the IOMMU
+ * code.  When you use this driver as a template for a new K8 AGP bridge
+ * driver don't forget to change arch/x86_64/kernel/pci-gart.c too -AK.
+ */
+
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/init.h>
@@ -505,7 +511,8 @@ static struct __initdata pci_driver agp_amdk8_pci_driver = {
 	.probe		= agp_amdk8_probe,
 };
 
-static int __init agp_amdk8_init(void)
+/* Not static due to IOMMU code calling it early. */
+int __init agp_amdk8_init(void)
 {
 	int ret_val;
 
@@ -524,8 +531,12 @@ static void __exit agp_amdk8_cleanup(void)
 	pci_unregister_driver(&agp_amdk8_pci_driver);
 }
 
+/* On x86-64 the PCI driver needs to initialize this driver early
+   for the IOMMU, so it has to be called via a backdoor. */
+#ifndef CONFIG_GART_IOMMU
 module_init(agp_amdk8_init);
 module_exit(agp_amdk8_cleanup);
+#endif
 
 MODULE_AUTHOR("Dave Jones <davej@codemonkey.org.uk>");
 MODULE_LICENSE("GPL and additional rights");