add is_buffer_dma_capable helper function

is_buffer_dma_capable helper function is to see if a memory region is DMA-capable or not. The arugments are the dma_mask (or coherent_dma_mask) of a device and the address and size of a memory region. 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>

add is_buffer_dma_capable helper function
is_buffer_dma_capable helper function is to see if a memory region is DMA-capable or not. The arugments are the dma_mask (or coherent_dma_mask) of a device and the address and size of a memory region. 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>
FUJITA Tomonori · Ingo Molnar
1 parent e92b4fdacc
Showing 1 changed file with 5 additions and 0 deletions Side-by-side Diff
include/linux/dma-mapping.h
@@ -48,6 +48,11 @@
 	return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
 }
  
+static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
+{
+	return addr + size <= mask;
+}
+
 #ifdef CONFIG_HAS_DMA
 #include <asm/dma-mapping.h>
 #else
...	...	@@ -48,6 +48,11 @@
48	48	return dev->dma_mask != NULL && *dev->dma_mask != DMA_MASK_NONE;
49	49	}
50	50
	51	+static inline int is_buffer_dma_capable(u64 mask, dma_addr_t addr, size_t size)
	52	+{
	53	+ return addr + size <= mask;
	54	+}
	55	+
51	56	#ifdef CONFIG_HAS_DMA
52	57	#include <asm/dma-mapping.h>
53	58	#else