[PATCH] x86_64: no_iommu removal in pci-gart.c

[linux-2.6] / arch / x86_64 / kernel / pci-gart.c

diff --git a/arch/x86_64/kernel/pci-gart.c b/arch/x86_64/kernel/pci-gart.c
index c37fc7726ba6704a5ff02a2ca6f32463f2420d8d..0c3f052ba6cebb8af7a6c79ca961611288be6727 100644 (file)
--- a/arch/x86_64/kernel/pci-gart.c
+++ b/arch/x86_64/kernel/pci-gart.c
@@ -228,11 +228,6 @@ static inline int need_iommu(struct device *dev, unsigned long addr, size_t size
        int mmu = high;
        if (force_iommu) 
                mmu = 1; 
-       if (no_iommu) { 
-               if (high) 
-                       panic("PCI-DMA: high address but no IOMMU.\n"); 
-               mmu = 0; 
-       }       
        return mmu; 
 }
 
@@ -241,11 +236,6 @@ static inline int nonforced_iommu(struct device *dev, unsigned long addr, size_t
        u64 mask = *dev->dma_mask;
        int high = addr + size >= mask;
        int mmu = high;
-       if (no_iommu) { 
-               if (high) 
-                       panic("PCI-DMA: high address but no IOMMU.\n"); 
-               mmu = 0; 
-       }       
        return mmu; 
 }
 
@@ -379,7 +369,7 @@ static int __dma_map_cont(struct scatterlist *sg, int start, int stopat,
                        SET_LEAK(iommu_page);
                        addr += PAGE_SIZE;
                        iommu_page++;
-       } 
+               }
        } 
        BUG_ON(iommu_page - iommu_start != pages);      
        return 0;
@@ -457,9 +447,12 @@ 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);
@@ -631,20 +624,25 @@ static int __init pci_iommu_init(void)
                (agp_copy_info(agp_bridge, &info) < 0);
 #endif 
 
-       if (swiotlb) { 
-               no_iommu = 1;
+       if (swiotlb)
                return -1; 
-       } 
-       
+
        if (no_iommu ||
            (!force_iommu && end_pfn <= MAX_DMA32_PFN) ||
            !iommu_aperture ||
            (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 +716,6 @@ 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;