common: dma-mapping: introduce common remapping functions

[cascardo/linux.git] / arch / arm / mm / dma-mapping.c

diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
index 7a996aa..eecc8e6 100644 (file)
--- a/arch/arm/mm/dma-mapping.c
+++ b/arch/arm/mm/dma-mapping.c
@@ -298,37 +298,19 @@ static void *
 __dma_alloc_remap(struct page *page, size_t size, gfp_t gfp, pgprot_t prot,
        const void *caller)
 {
-       struct vm_struct *area;
-       unsigned long addr;
-
        /*
         * DMA allocation can be mapped to user space, so lets
         * set VM_USERMAP flags too.
         */
-       area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
-                                 caller);
-       if (!area)
-               return NULL;
-       addr = (unsigned long)area->addr;
-       area->phys_addr = __pfn_to_phys(page_to_pfn(page));
-
-       if (ioremap_page_range(addr, addr + size, area->phys_addr, prot)) {
-               vunmap((void *)addr);
-               return NULL;
-       }
-       return (void *)addr;
+       return dma_common_contiguous_remap(page, size,
+                       VM_ARM_DMA_CONSISTENT | VM_USERMAP,
+                       prot, caller);
 }
 
 static void __dma_free_remap(void *cpu_addr, size_t size)
 {
-       unsigned int flags = VM_ARM_DMA_CONSISTENT | VM_USERMAP;
-       struct vm_struct *area = find_vm_area(cpu_addr);
-       if (!area || (area->flags & flags) != flags) {
-               WARN(1, "trying to free invalid coherent area: %p\n", cpu_addr);
-               return;
-       }
-       unmap_kernel_range((unsigned long)cpu_addr, size);
-       vunmap(cpu_addr);
+       dma_common_free_remap(cpu_addr, size,
+                       VM_ARM_DMA_CONSISTENT | VM_USERMAP);
 }
 
 #define DEFAULT_DMA_COHERENT_POOL_SIZE SZ_256K
@@ -1271,29 +1253,8 @@ static void *
 __iommu_alloc_remap(struct page **pages, size_t size, gfp_t gfp, pgprot_t prot,
                    const void *caller)
 {
-       unsigned int i, nr_pages = PAGE_ALIGN(size) >> PAGE_SHIFT;
-       struct vm_struct *area;
-       unsigned long p;
-
-       area = get_vm_area_caller(size, VM_ARM_DMA_CONSISTENT | VM_USERMAP,
-                                 caller);
-       if (!area)
-               return NULL;
-
-       area->pages = pages;
-       area->nr_pages = nr_pages;
-       p = (unsigned long)area->addr;
-
-       for (i = 0; i < nr_pages; i++) {
-               phys_addr_t phys = __pfn_to_phys(page_to_pfn(pages[i]));
-               if (ioremap_page_range(p, p + PAGE_SIZE, phys, prot))
-                       goto err;
-               p += PAGE_SIZE;
-       }
-       return area->addr;
-err:
-       unmap_kernel_range((unsigned long)area->addr, size);
-       vunmap(area->addr);
+       return dma_common_pages_remap(pages, size,
+                       VM_ARM_DMA_CONSISTENT | VM_USERMAP, prot, caller);
        return NULL;
 }
 
@@ -1501,8 +1462,8 @@ void arm_iommu_free_attrs(struct device *dev, size_t size, void *cpu_addr,
        }
 
        if (!dma_get_attr(DMA_ATTR_NO_KERNEL_MAPPING, attrs)) {
-               unmap_kernel_range((unsigned long)cpu_addr, size);
-               vunmap(cpu_addr);
+               dma_common_free_remap(cpu_addr, size,
+                       VM_ARM_DMA_CONSISTENT | VM_USERMAP);
        }
 
        __iommu_remove_mapping(dev, handle, size);