Merge branch 'master'

1 files changed, 15 insertions, 4 deletions

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index c37fc7726ba..2fe23a6c361 100644
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -457,9 +457,12 @@ int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents, int dir)
 error:
 	flush_gart(NULL);
 	gart_unmap_sg(dev, sg, nents, dir);
-	/* When it was forced try again unforced */
-	if (force_iommu) 
-		return dma_map_sg_nonforce(dev, sg, nents, dir);
+	/* When it was forced or merged try again in a dumb way */
+	if (force_iommu || iommu_merge) {
+		out = dma_map_sg_nonforce(dev, sg, nents, dir);
+		if (out > 0)
+			return out;
+	}
 	if (panic_on_overflow)
 		panic("dma_map_sg: overflow on %lu pages\n", pages);
 	iommu_full(dev, pages << PAGE_SHIFT, dir);
@@ -642,9 +645,18 @@ static int __init pci_iommu_init(void)
 	    (no_agp && init_k8_gatt(&info) < 0)) {
 		no_iommu = 1;
 		no_iommu_init();
+		printk(KERN_INFO "PCI-DMA: Disabling IOMMU.\n");
+		if (end_pfn > MAX_DMA32_PFN) {
+			printk(KERN_ERR "WARNING more than 4GB of memory "
+					"but IOMMU not compiled in.\n"
+			       KERN_ERR "WARNING 32bit PCI may malfunction.\n"
+			       KERN_ERR "You might want to enable "
+					"CONFIG_GART_IOMMU\n");
+		}
 		return -1;
 	}
 
+	printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
 	aper_size = info.aper_size * 1024 * 1024;	
 	iommu_size = check_iommu_size(info.aper_base, aper_size); 
 	iommu_pages = iommu_size >> PAGE_SHIFT; 
@@ -718,7 +730,6 @@ static int __init pci_iommu_init(void)
 		     
 	flush_gart(NULL);
 
-	printk(KERN_INFO "PCI-DMA: using GART IOMMU.\n");
 	dma_ops = &gart_dma_ops;
 
 	return 0;