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Date: Wed, 19 Mar 2008 18:07:09 -0700
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>,
Michael Ellerman <michael@...erman.id.au>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 0/3 v5] dma: add dma_*map*_attrs() interfaces
v4-v5 changes:
- select HAVE_DMA_ATTRS via Kconfig
- changed the name DMA_ATTR_BARRIER to DMA_ATTR_WRITE_BARRIER
- changed struct dma_attrs to be a wrapper around a bitmap
- kernel-doc-ified some comments
- recombined the lib/swiotlb.c patch into the ia64-arch patch
(they need to go in together, or other forward decls are needed)
---
Introduce new interfaces, dma_*map*_attrs(), for passing
architecture-specific attributes when memory is mapped and
unmapped for DMA. Give the interfaces default implementations
which ignore attributes. Also introduce the dma_{set|get}_attr()
interfaces for setting and retrieving individual attributes. Define
one attribute, DMA_ATTR_WRITE_BARRIER, in anticipation of its use
by ia64/sn. Select whether architectures implement arch-specific
versions of the dma_*map*_attrs() interfaces via HAVE_DMA_ATTRS in
Kconfig.
Signed-off-by: Arthur Kepner <akepner@....com>
---
arch/Kconfig | 3 +
arch/ia64/Kconfig | 1
include/linux/dma-attrs.h | 74 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/dma-mapping.h | 35 ++++++++++++++++++++
4 files changed, 113 insertions(+)
diff --git a/arch/Kconfig b/arch/Kconfig
index 694c9af..3ea332b 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -36,3 +36,6 @@ config HAVE_KPROBES
config HAVE_KRETPROBES
def_bool n
+
+config HAVE_DMA_ATTRS
+ def_bool n
diff --git a/arch/ia64/Kconfig b/arch/ia64/Kconfig
index 8fa3faf..985b267 100644
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -19,6 +19,7 @@ config IA64
select HAVE_OPROFILE
select HAVE_KPROBES
select HAVE_KRETPROBES
+ select HAVE_DMA_ATTRS
default y
help
The Itanium Processor Family is Intel's 64-bit successor to
diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h
index e69de29..5f151fb 100644
--- a/include/linux/dma-attrs.h
+++ b/include/linux/dma-attrs.h
@@ -0,0 +1,74 @@
+#ifndef _DMA_ATTR_H
+#define _DMA_ATTR_H
+
+#include <linux/bitmap.h>
+#include <linux/bitops.h>
+#include <linux/bug.h>
+
+/**
+ * an enum dma_attr represents an attribute associated with a DMA
+ * mapping. The semantics of each attribute should be defined in
+ * Documentation/DMA-attributes.txt.
+ */
+enum dma_attr {
+ DMA_ATTR_WRITE_BARRIER,
+ DMA_ATTR_MAX,
+};
+
+#define __DMA_ATTRS_LONGS BITS_TO_LONGS(DMA_ATTR_MAX)
+
+/**
+ * struct dma_attrs - an opaque container for DMA attributes
+ * @flags - bitmask representing a collection of enum dma_attr
+ */
+struct dma_attrs {
+ unsigned long flags[__DMA_ATTRS_LONGS];
+};
+
+#define DEFINE_DMA_ATTRS(x) \
+ struct dma_attrs x = { \
+ .flags = { [0 ... __DMA_ATTRS_LONGS-1] = 0 }, \
+ }
+
+static inline void init_dma_attrs(struct dma_attrs *attrs)
+{
+ bitmap_zero(attrs->flags, __DMA_ATTRS_LONGS);
+}
+
+#ifdef CONFIG_HAVE_DMA_ATTRS
+/**
+ * dma_set_attr - set a specific attribute
+ * @attr: attribute to set
+ * @attrs: struct dma_attrs (may be NULL)
+ */
+void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
+{
+ if (attrs == NULL)
+ return;
+ BUG_ON(attr >= DMA_ATTR_MAX);
+ __set_bit(attr, attrs->flags);
+}
+
+/**
+ * dma_get_attr - check for a specific attribute
+ * @attr: attribute to set
+ * @attrs: struct dma_attrs (may be NULL)
+ */
+int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
+{
+ if (attrs == NULL)
+ return 0;
+ BUG_ON(attr >= DMA_ATTR_MAX);
+ return test_bit(attr, attrs->flags);
+}
+#else /* !CONFIG_HAVE_DMA_ATTRS */
+static inline void dma_set_attr(enum dma_attr attr, struct dma_attrs *attrs)
+{
+}
+
+static inline int dma_get_attr(enum dma_attr attr, struct dma_attrs *attrs)
+{
+ return 0;
+}
+#endif /* CONFIG_HAVE_DMA_ATTRS */
+#endif /* _DMA_ATTR_H */
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 3320307..f757d63 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 CONFIG_HAVE_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 /* CONFIG_HAVE_DMA_ATTRS */
+
#endif
--
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