- patches.suse/slab-handle-memoryless-nodes-v2a.patch: Refresh.

[linux-flexiantxendom0-3.2.10.git] / arch / x86 / kernel / pci-swiotlb.c

diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index aaa6b78..7d2829d 100644 (file)
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -42,18 +42,31 @@ 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 ((!iommu_detected && !no_iommu && max_pfn > MAX_DMA32_PFN))
+       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) {
-               printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
-               swiotlb_init();
+               swiotlb_init(0);
                dma_ops = &swiotlb_dma_ops;
        }
 }