iommu: export iommu_area_reserve helper function

x86 has set_bit_string() that does the exact same thing that
set_bit_area() in lib/iommu-helper.c does.

This patch exports set_bit_area() in lib/iommu-helper.c as
iommu_area_reserve(), converts GART, Calgary, and AMD IOMMU to use it.

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>

5 files changed, 6 insertions, 6 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 6f7b97445738..70537d117a96 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -572,7 +572,7 @@ static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
         if (start_page + pages > last_page)
                 pages = last_page - start_page;
 
-        set_bit_string(dom->bitmap, start_page, pages);
+        iommu_area_reserve(dom->bitmap, start_page, pages);
 }
 
 static void dma_ops_free_pagetable(struct dma_ops_domain *dma_dom)
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index fe7695e4caae..080d1d27f37a 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -261,7 +261,7 @@ static void iommu_range_reserve(struct iommu_table *tbl,
                                badbit, tbl, start_addr, npages);
         }
 
-        set_bit_string(tbl->it_map, index, npages);
+        iommu_area_reserve(tbl->it_map, index, npages);
 
         spin_unlock_irqrestore(&tbl->it_lock, flags);
 }
diff --git a/arch/x86/kernel/pci-gart_64.c b/arch/x86/kernel/pci-gart_64.c
index 508ef470b27f..3dcb1ad86e38 100644
--- a/arch/x86/kernel/pci-gart_64.c
+++ b/arch/x86/kernel/pci-gart_64.c
@@ -827,7 +827,7 @@ 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
diff --git a/include/linux/iommu-helper.h b/include/linux/iommu-helper.h
index 58f41107e4ae..786539e432d7 100644
--- a/include/linux/iommu-helper.h
+++ b/include/linux/iommu-helper.h
@@ -11,6 +11,7 @@ static inline unsigned long iommu_device_max_index(unsigned long size,
 extern int iommu_is_span_boundary(unsigned int index, unsigned int nr,
                                   unsigned long shift,
                                   unsigned long boundary_size);
+extern void iommu_area_reserve(unsigned long *map, unsigned long i, int len);
 extern unsigned long iommu_area_alloc(unsigned long *map, unsigned long size,
                                       unsigned long start, unsigned int nr,
                                       unsigned long shift,
diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index a3b8d4c3f77a..5d90074dca75 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -30,8 +30,7 @@ again:
         return index;
 }
 
-static inline void set_bit_area(unsigned long *map, unsigned long i,
-                                int len)
+void iommu_area_reserve(unsigned long *map, unsigned long i, int len)
 {
         unsigned long end = i + len;
         while (i < end) {
@@ -64,7 +63,7 @@ again:
                         start = index + 1;
                         goto again;
                 }
-                set_bit_area(map, index, nr);
+                iommu_area_reserve(map, index, nr);
         }
         return index;
 }