common: dma-mapping: add support for generic dma_mmap_* calls

Commit 9adc5374 ('common: dma-mapping: introduce mmap method') added a
generic method for implementing mmap user call to dma_map_ops structure.

This patch converts ARM and PowerPC architectures (the only providers of
dma_mmap_coherent/dma_mmap_writecombine calls) to use this generic
dma_map_ops based call and adds a generic cross architecture
definition for dma_mmap_attrs, dma_mmap_coherent, dma_mmap_writecombine
functions.

The generic mmap virt_to_page-based fallback implementation is provided for
architectures which don't provide their own implementation for mmap method.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com>

4 files changed, 22 insertions, 17 deletions

diff --git a/arch/powerpc/kernel/dma-iommu.c b/arch/powerpc/kernel/dma-iommu.c
index bcfdcd22c76..2d7bb8ced13 100644
--- a/arch/powerpc/kernel/dma-iommu.c
+++ b/arch/powerpc/kernel/dma-iommu.c
@@ -109,6 +109,7 @@ static u64 dma_iommu_get_required_mask(struct device *dev)
 struct dma_map_ops dma_iommu_ops = {
         .alloc                  = dma_iommu_alloc_coherent,
         .free                   = dma_iommu_free_coherent,
+        .mmap                   = dma_direct_mmap_coherent,
         .map_sg                 = dma_iommu_map_sg,
         .unmap_sg               = dma_iommu_unmap_sg,
         .dma_supported          = dma_iommu_dma_supported,
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 4ab88dafb23..46943651da2 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -49,6 +49,7 @@ static u64 swiotlb_powerpc_get_required(struct device *dev)
 struct dma_map_ops swiotlb_dma_ops = {
         .alloc = dma_direct_alloc_coherent,
         .free = dma_direct_free_coherent,
+        .mmap = dma_direct_mmap_coherent,
         .map_sg = swiotlb_map_sg_attrs,
         .unmap_sg = swiotlb_unmap_sg_attrs,
         .dma_supported = swiotlb_dma_supported,
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index b1ec983dcec..062bf20e6dd 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -65,6 +65,24 @@ void dma_direct_free_coherent(struct device *dev, size_t size,
 #endif
 }
 
+int dma_direct_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
+                             void *cpu_addr, dma_addr_t handle, size_t size,
+                             struct dma_attrs *attrs)
+{
+        unsigned long pfn;
+
+#ifdef CONFIG_NOT_COHERENT_CACHE
+        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+        pfn = __dma_get_coherent_pfn((unsigned long)cpu_addr);
+#else
+        pfn = page_to_pfn(virt_to_page(cpu_addr));
+#endif
+        return remap_pfn_range(vma, vma->vm_start,
+                               pfn + vma->vm_pgoff,
+                               vma->vm_end - vma->vm_start,
+                               vma->vm_page_prot);
+}
+
 static int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl,
                              int nents, enum dma_data_direction direction,
                              struct dma_attrs *attrs)
@@ -154,6 +172,7 @@ static inline void dma_direct_sync_single(struct device *dev,
 struct dma_map_ops dma_direct_ops = {
         .alloc                          = dma_direct_alloc_coherent,
         .free                           = dma_direct_free_coherent,
+        .mmap                           = dma_direct_mmap_coherent,
         .map_sg                         = dma_direct_map_sg,
         .unmap_sg                       = dma_direct_unmap_sg,
         .dma_supported                  = dma_direct_dma_supported,
@@ -211,20 +230,3 @@ static int __init dma_init(void)
 }
 fs_initcall(dma_init);
 
-int dma_mmap_coherent(struct device *dev, struct vm_area_struct *vma,
-                      void *cpu_addr, dma_addr_t handle, size_t size)
-{
-        unsigned long pfn;
-
-#ifdef CONFIG_NOT_COHERENT_CACHE
-        vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-        pfn = __dma_get_coherent_pfn((unsigned long)cpu_addr);
-#else
-        pfn = page_to_pfn(virt_to_page(cpu_addr));
-#endif
-        return remap_pfn_range(vma, vma->vm_start,
-                               pfn + vma->vm_pgoff,
-                               vma->vm_end - vma->vm_start,
-                               vma->vm_page_prot);
-}
-EXPORT_SYMBOL_GPL(dma_mmap_coherent);
diff --git a/arch/powerpc/kernel/vio.c b/arch/powerpc/kernel/vio.c
index cb87301ccd5..dda3d9ad109 100644
--- a/arch/powerpc/kernel/vio.c
+++ b/arch/powerpc/kernel/vio.c
@@ -613,6 +613,7 @@ static u64 vio_dma_get_required_mask(struct device *dev)
 struct dma_map_ops vio_dma_mapping_ops = {
         .alloc             = vio_dma_iommu_alloc_coherent,
         .free              = vio_dma_iommu_free_coherent,
+        .mmap              = dma_direct_mmap_coherent,
         .map_sg            = vio_dma_iommu_map_sg,
         .unmap_sg          = vio_dma_iommu_unmap_sg,
         .map_page          = vio_dma_iommu_map_page,