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[05/15] x86: add dma_capable() to replace is_buffer_dma_capable()

Message ID 1247187904-31999-6-git-send-email-fujita.tomonori@lab.ntt.co.jp (mailing list archive)
State Not Applicable
Headers show

Commit Message

FUJITA Tomonori July 10, 2009, 1:04 a.m. UTC
dma_capable() eventually replaces is_buffer_dma_capable(), which tells
if a memory area is dma-capable or not. The problem of
is_buffer_dma_capable() is that it doesn't take a pointer to struct
device so it doesn't work for POWERPC.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
 arch/x86/include/asm/dma-mapping.h |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
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diff --git a/arch/x86/include/asm/dma-mapping.h b/arch/x86/include/asm/dma-mapping.h
index 1c3f943..adac59c 100644
--- a/arch/x86/include/asm/dma-mapping.h
+++ b/arch/x86/include/asm/dma-mapping.h
@@ -55,6 +55,14 @@  extern int dma_set_mask(struct device *dev, u64 mask);
 extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
 					dma_addr_t *dma_addr, gfp_t flag);
+static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
+	if (!dev->dma_mask)
+		return 0;
+	return addr + size <= *dev->dma_mask;
 static inline void
 dma_cache_sync(struct device *dev, void *vaddr, size_t size,
 	enum dma_data_direction dir)