The patch titled
dma: add dma_*map*_attrs() interfaces
has been added to the -mm tree. Its filename is
dma-add-dma_map_attrs-interfaces.patch
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------------------------------------------------------
Subject: dma: add dma_*map*_attrs() interfaces
From: Arthur Kepner <akepner@xxxxxxx>
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@xxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Cc: Jes Sorensen <jes@xxxxxxx>
Cc: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
Cc: Roland Dreier <rdreier@xxxxxxxxx>
Cc: James Bottomley <James.Bottomley@xxxxxxxxxxxxxxxxxxxxx>
Cc: David Miller <davem@xxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Grant Grundler <grundler@xxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <michael@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/Kconfig | 3 +
arch/ia64/Kconfig | 1
include/linux/dma-attrs.h | 74 ++++++++++++++++++++++++++++++++++
include/linux/dma-mapping.h | 17 +++++++
4 files changed, 95 insertions(+)
diff -puN arch/Kconfig~dma-add-dma_map_attrs-interfaces arch/Kconfig
--- a/arch/Kconfig~dma-add-dma_map_attrs-interfaces
+++ a/arch/Kconfig
@@ -36,3 +36,6 @@ config HAVE_KPROBES
config HAVE_KRETPROBES
def_bool n
+
+config HAVE_DMA_ATTRS
+ def_bool n
diff -puN arch/ia64/Kconfig~dma-add-dma_map_attrs-interfaces arch/ia64/Kconfig
--- a/arch/ia64/Kconfig~dma-add-dma_map_attrs-interfaces
+++ a/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 -puN include/linux/dma-attrs.h~dma-add-dma_map_attrs-interfaces include/linux/dma-attrs.h
--- a/include/linux/dma-attrs.h~dma-add-dma_map_attrs-interfaces
+++ a/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 -puN include/linux/dma-mapping.h~dma-add-dma_map_attrs-interfaces include/linux/dma-mapping.h
--- a/include/linux/dma-mapping.h~dma-add-dma_map_attrs-interfaces
+++ a/include/linux/dma-mapping.h
@@ -146,4 +146,21 @@ static inline void dmam_release_declared
}
#endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */
+#ifndef CONFIG_HAVE_DMA_ATTRS
+struct dma_attrs;
+
+#define dma_map_single_attrs(dev, cpu_addr, size, dir, attrs) \
+ dma_map_single(dev, cpu_addr, size, dir)
+
+#define dma_unmap_single_attrs(dev, dma_addr, size, dir, attrs) \
+ dma_unmap_single(dev, dma_addr, size, dir)
+
+#define dma_map_sg_attrs(dev, sgl, nents, dir, attrs) \
+ dma_map_sg(dev, sgl, nents, dir)
+
+#define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \
+ dma_unmap_sg(dev, sgl, nents, dir)
+
+#endif /* CONFIG_HAVE_DMA_ATTRS */
+
#endif
_
Patches currently in -mm which might be from akepner@xxxxxxx are
dma-add-dma_map_attrs-interfaces.patch
dma-document-dma_map_attrs-interfaces.patch
dma-ia64-update-ia64-machvecs-swiotlbc.patch
ib-expand-ib_umem_get-prototype.patch
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