revert "x86: make GART to respect device's dma_mask about virtual mappings"

[linux-2.6-omap-h63xx.git] / arch / x86 / kernel / pci-gart_64.c

diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 338c4f2415598b6fdf253e5d52408567f885394c..7e08e466b8ad370465fbc3f6e6e99fd78e8d07aa 100644 (file)
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -214,24 +214,14 @@ static void iommu_full(struct device *dev, size_t size, int dir)
 static inline int
 need_iommu(struct device *dev, unsigned long addr, size_t size)
 {
-       u64 mask = *dev->dma_mask;
-       int high = addr + size > mask;
-       int mmu = high;
-
-       if (force_iommu)
-               mmu = 1;
-
-       return mmu;
+       return force_iommu ||
+               !is_buffer_dma_capable(*dev->dma_mask, addr, size);
 }
 
 static inline int
 nonforced_iommu(struct device *dev, unsigned long addr, size_t size)
 {
-       u64 mask = *dev->dma_mask;
-       int high = addr + size > mask;
-       int mmu = high;
-
-       return mmu;
+       return !is_buffer_dma_capable(*dev->dma_mask, addr, size);
 }
 
 /* Map a single continuous physical area into the IOMMU.
@@ -261,20 +251,6 @@ static dma_addr_t dma_map_area(struct device *dev, dma_addr_t phys_mem,
        return iommu_bus_base + iommu_page*PAGE_SIZE + (phys_mem & ~PAGE_MASK);
 }
 
-static dma_addr_t
-gart_map_simple(struct device *dev, phys_addr_t paddr, size_t size, int dir)
-{
-       dma_addr_t map;
-       unsigned long align_mask;
-
-       align_mask = (1UL << get_order(size)) - 1;
-       map = dma_map_area(dev, paddr, size, dir, align_mask);
-
-       flush_gart();
-
-       return map;
-}
-
 /* Map a single area into the IOMMU */
 static dma_addr_t
 gart_map_single(struct device *dev, phys_addr_t paddr, size_t size, int dir)
@@ -512,12 +488,26 @@ gart_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_addr,
                    gfp_t flag)
 {
        void *vaddr;
+       dma_addr_t paddr;
+       unsigned long align_mask;
+       u64 dma_mask = dma_alloc_coherent_mask(dev, flag);
 
        vaddr = (void *)__get_free_pages(flag | __GFP_ZERO, get_order(size));
        if (!vaddr)
                return NULL;
 
-       *dma_addr = gart_map_single(dev, __pa(vaddr), size, DMA_BIDIRECTIONAL);
+       paddr = virt_to_phys(vaddr);
+       if (is_buffer_dma_capable(dma_mask, paddr, size)) {
+               *dma_addr = paddr;
+               return vaddr;
+       }
+
+       align_mask = (1UL << get_order(size)) - 1;
+
+       *dma_addr = dma_map_area(dev, paddr, size, DMA_BIDIRECTIONAL,
+                                align_mask);
+       flush_gart();
+
        if (*dma_addr != bad_dma_address)
                return vaddr;
 
@@ -829,7 +819,7 @@ void __init gart_iommu_init(void)
         * Out of IOMMU space handling.
         * Reserve some invalid pages at the beginning of the GART.
         */
-       set_bit_string(iommu_gart_bitmap, 0, EMERGENCY_PAGES);
+       iommu_area_reserve(iommu_gart_bitmap, 0, EMERGENCY_PAGES);
 
        agp_memory_reserved = iommu_size;
        printk(KERN_INFO