A lazy version of dma_mmap_coherent() implementation for x86.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
arch/x86/include/asm/dma-mapping.h | 16 ++++++++++++++++
include/linux/dma-mapping.h | 2 ++
2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 1c3f943..4941ad9 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -139,4 +139,20 @@ static inline void dma_free_coherent(struct device *dev, size_t size,
ops->free_coherent(dev, size, vaddr, bus);
}
+#define ARCH_HAS_DMA_MMAP_COHERENT
+static inline int dma_mmap_coherent(struct device *dev,
+ struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle,
+ size_t size)
+{
+ struct dma_map_ops *ops = get_dma_ops(dev);
+ unsigned long pfn;
+
+ if (ops->mmap_coherent)
+ return ops->mmap_coherent(dev, vma, cpu_addr, handle, size);
+ pfn = page_to_pfn(virt_to_page(cpu_addr));
+ return remap_pfn_range(vma, vma->vm_start, pfn + vma->vm_pgoff,
+ size, vma->vm_page_prot);
+}
+
#endif
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 07dfd46..9ddc6ae 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -58,6 +58,8 @@ struct dma_map_ops {
enum dma_data_direction dir);
int (*mapping_error)(struct device *dev, dma_addr_t dma_addr);
int (*dma_supported)(struct device *dev, u64 mask);
+ int (*mmap_coherent)(struct device *dev, struct vm_area_struct *vma,
+ void *cpu_addr, dma_addr_t handle, size_t size);
int is_phys;
};
--
1.6.3.2
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