1 files changed, 15 insertions, 30 deletions

diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index b2a71dca5642..afcc58b69c7c 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -11,10 +11,11 @@
 #include <asm/gart.h>
 #include <asm/calgary.h>
 #include <asm/amd_iommu.h>
+#include <asm/x86_init.h>
 
 static int forbid_dac __read_mostly;
 
-struct dma_map_ops *dma_ops;
+struct dma_map_ops *dma_ops = &nommu_dma_ops;
 EXPORT_SYMBOL(dma_ops);
 
 static int iommu_sac_force __read_mostly;
@@ -42,15 +43,10 @@ int iommu_detected __read_mostly = 0;
  */
 int iommu_pass_through __read_mostly;
 
-dma_addr_t bad_dma_address __read_mostly = 0;
-EXPORT_SYMBOL(bad_dma_address);
-
-/* Dummy device used for NULL arguments (normally ISA). Better would
-   be probably a smaller DMA mask, but this is bug-to-bug compatible
-   to older i386. */
+/* Dummy device used for NULL arguments (normally ISA). */
 struct device x86_dma_fallback_dev = {
         .init_name = "fallback device",
-        .coherent_dma_mask = DMA_BIT_MASK(32),
+        .coherent_dma_mask = ISA_DMA_BIT_MASK,
         .dma_mask = &x86_dma_fallback_dev.coherent_dma_mask,
 };
 EXPORT_SYMBOL(x86_dma_fallback_dev);
@@ -128,20 +124,17 @@ void __init pci_iommu_alloc(void)
         /* free the range so iommu could get some range less than 4G */
         dma32_free_bootmem();
 #endif
+        if (pci_swiotlb_init())
+                return;
 
-        /*
-         * The order of these functions is important for
-         * fall-back/fail-over reasons
-         */
         gart_iommu_hole_init();
 
         detect_calgary();
 
         detect_intel_iommu();
 
+        /* needs to be called after gart_iommu_hole_init */
         amd_iommu_detect();
-
-        pci_swiotlb_init();
 }
 
 void *dma_generic_alloc_coherent(struct device *dev, size_t size,
@@ -216,7 +209,7 @@ static __init int iommu_setup(char *p)
                 if (!strncmp(p, "allowdac", 8))
                         forbid_dac = 0;
                 if (!strncmp(p, "nodac", 5))
-                        forbid_dac = -1;
+                        forbid_dac = 1;
                 if (!strncmp(p, "usedac", 6)) {
                         forbid_dac = -1;
                         return 1;
@@ -291,25 +284,17 @@ static int __init pci_iommu_init(void)
 #ifdef CONFIG_PCI
         dma_debug_add_bus(&pci_bus_type);
 #endif
+        x86_init.iommu.iommu_init();
 
-        calgary_iommu_init();
-
-        intel_iommu_init();
+        if (swiotlb) {
+                printk(KERN_INFO "PCI-DMA: "
+                       "Using software bounce buffering for IO (SWIOTLB)\n");
+                swiotlb_print_info();
+        } else
+                swiotlb_free();
 
-        amd_iommu_init();
-
-        gart_iommu_init();
-
-        no_iommu_init();
         return 0;
 }
-
-void pci_iommu_shutdown(void)
-{
-        gart_iommu_shutdown();
-
-        amd_iommu_shutdown();
-}
 /* Must execute after PCI subsystem */
 rootfs_initcall(pci_iommu_init);