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authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-09-10 01:06:46 +0900
committerIngo Molnar <mingo@elte.hu>2008-09-10 11:33:43 +0200
commit636dc67cbf8c481a996faf6c23f0532d0f02ebad (patch)
tree344e1d8c6e4b91cfb941d2dfba76ac6498393b19 /include
parente92b4fdacc6a7d8cc7895b81347671d5fcd6c5e1 (diff)
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>
Diffstat (limited to 'include')
-rw-r--r--include/linux/dma-mapping.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 952e0f857ac..6ed50c1642f 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -48,6 +48,11 @@ static inline int is_device_dma_capable(struct device *dev)
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