linux-kernel - [PATCH 0/3 v3] dma: dma_{un}map_{single|sg}

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Date:	Wed, 27 Feb 2008 19:23:51 -0800
From:	akepner@....com
To:	Tony Luck <tony.luck@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Jes Sorensen <jes@....com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	Roland Dreier <rdreier@...co.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	David Miller <davem@...emloft.net>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Grant Grundler <grundler@...isc-linux.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 0/3 v3] dma: dma_{un}map_{single|sg}_attrs() interface


v2->v3 changes:
mainly cosmetic changes to make checkpatch a little happier - 
trailing whitespace, long lines.... Also made dma_set_attr() a 
no-op inline func when ARCH_USES_DMA_ATTRS is not defined instead 
of a macro.

I'd like to get this one queued up for 2.6.26.

--- 

Introduce a new interface for passing architecture-specific
attributes when memory is mapped and unmapped for DMA. Give
the interface a default implementation which ignores
attributes.

Signed-off-by: Arthur Kepner <akepner@....com>

---

 dma-mapping.h |   35 +++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+)


diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 3320307..5a0e924 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -146,4 +146,39 @@ static inline void dmam_release_declared_memory(struct device *dev)
 }
 #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
 
+#ifndef ARCH_USES_DMA_ATTRS
+struct dma_attrs;
+
+static inline dma_addr_t dma_map_single_attrs(struct device *dev,
+					      void *cpu_addr, size_t size,
+					      enum dma_data_direction dir,
+					      struct dma_attrs *attrs)
+{
+	return dma_map_single(dev, cpu_addr, size, dir);
+}
+
+static inline void dma_unmap_single_attrs(struct device *dev,
+					  dma_addr_t dma_addr, size_t size,
+					  enum dma_data_direction dir,
+					  struct dma_attrs *attrs)
+{
+	return dma_unmap_single(dev, dma_addr, size, dir);
+}
+
+static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl,
+				   int nents, enum dma_data_direction dir,
+				   struct dma_attrs *attrs)
+{
+	return dma_map_sg(dev, sgl, nents, dir);
+}
+
+static inline void dma_unmap_sg_attrs(struct device *dev,
+				      struct scatterlist *sgl, int nents,
+				      enum dma_data_direction dir,
+				      struct dma_attrs *attrs)
+{
+	return dma_unmap_sg(dev, sgl, nents, dir);
+}
+#endif /* ARCH_USES_DMA_ATTRS */
+
 #endif
--
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