AMD IOMMU: use iommu_device_max_index

AMD IOMMU can use iommu_device_max_index() instead of the homegrown
function.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 3 insertions, 7 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index c19212191c98..3b346c6f5514 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -470,10 +470,6 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
  * efficient allocator.
  *
  ****************************************************************************/
-static unsigned long dma_mask_to_pages(unsigned long mask)
-{
-        return PAGE_ALIGN(mask) >> PAGE_SHIFT;
-}
 
 /*
  * The address allocator core function.
@@ -486,14 +482,14 @@ static unsigned long dma_ops_alloc_addresses(struct device *dev,
                                              unsigned long align_mask,
                                              u64 dma_mask)
 {
-        unsigned long limit = dma_mask_to_pages(dma_mask);
+        unsigned long limit;
         unsigned long address;
-        unsigned long size = dom->aperture_size >> PAGE_SHIFT;
         unsigned long boundary_size;
 
         boundary_size = ALIGN(dma_get_seg_boundary(dev) + 1,
                         PAGE_SIZE) >> PAGE_SHIFT;
-        limit = limit < size ? limit : size;
+        limit = iommu_device_max_index(dom->aperture_size >> PAGE_SHIFT, 0,
+                                       dma_mask >> PAGE_SHIFT);
 
         if (dom->next_bit >= limit) {
                 dom->next_bit = 0;