Merge branch 'for-linus' of git://git390.marist.edu/pub/scm/linux-2.6

[safe/jmp/linux-2.6] / arch / x86 / kernel / pci-swiotlb.c

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 17ce422..a5bc528 100644 (file)
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -31,8 +31,6 @@ static struct dma_map_ops swiotlb_dma_ops = {
        .free_coherent = swiotlb_free_coherent,
        .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
        .sync_single_for_device = swiotlb_sync_single_for_device,
-       .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
-       .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
        .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
        .sync_sg_for_device = swiotlb_sync_sg_for_device,
        .map_sg = swiotlb_map_sg_attrs,
@@ -42,16 +40,31 @@ static struct dma_map_ops swiotlb_dma_ops = {
        .dma_supported = NULL,
 };
 
-void __init pci_swiotlb_init(void)
+/*
+ * pci_swiotlb_detect - set swiotlb to 1 if necessary
+ *
+ * This returns non-zero if we are forced to use swiotlb (by the boot
+ * option).
+ */
+int __init pci_swiotlb_detect(void)
 {
+       int use_swiotlb = swiotlb | swiotlb_force;
+
        /* don't initialize swiotlb if iommu=off (no_iommu=1) */
 #ifdef CONFIG_X86_64
        if (!no_iommu && max_pfn > MAX_DMA32_PFN)
                swiotlb = 1;
 #endif
+       if (swiotlb_force)
+               swiotlb = 1;
+
+       return use_swiotlb;
+}
+
+void __init pci_swiotlb_init(void)
+{
        if (swiotlb) {
                swiotlb_init(0);
                dma_ops = &swiotlb_dma_ops;
-       } else
-               dma_ops = &nommu_dma_ops;
+       }
 }