+ avr32-dma-mappingh.patch added to -mm tree

+ avr32-dma-mappingh.patch added to -mm tree

[akpm]

The patch titled
     avr32: dma-mapping.h
has been added to the -mm tree.  Its filename is
     avr32-dma-mappingh.patch

*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this

------------------------------------------------------
Subject: avr32: dma-mapping.h
From: "Gary Zambrano" <zambrano@broadcom.com>

Added dma_sync_single_range_for_cpu/device to dma-mapping.h in asm-avr32 to
call dma_sync_single_for_cpu/device.  This patch enables b44 to compile on
systems with these cpus.  This patch was created with the assumption that
another method of dma_sync_single_range_for_cpu/device does not exist on these
architectures.

Signed-off by: Gary Zambrano <zambrano@broadcom.com>
Cc: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 include/asm-avr32/dma-mapping.h |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+)

diff -puN include/asm-avr32/dma-mapping.h~avr32-dma-mappingh include/asm-avr32/dma-mapping.h
--- a/include/asm-avr32/dma-mapping.h~avr32-dma-mappingh
+++ a/include/asm-avr32/dma-mapping.h
@@ -242,6 +242,24 @@ dma_unmap_sg(struct device *dev, struct 
 {
 
 }
+static inline void
+dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
+			      unsigned long offset, size_t size,
+			      enum dma_data_direction direction)
+{
+	/* just sync everything, that's all the pci API can do */
+	dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);
+}
+
+static inline void
+dma_sync_single_range_for_device(struct device *dev, dma_addr_t dma_handle,
+				 unsigned long offset, size_t size,
+				 enum dma_data_direction direction)
+{
+	/* just sync everything, that's all the pci API can do */
+	dma_sync_single_for_device(dev, dma_handle, offset+size, direction);
+}
+
 
 /**
  * dma_sync_single_for_cpu
_

Patches currently in -mm which might be from zambrano@broadcom.com are

arm-dma-mappingh.patch
avr32-dma-mappingh.patch

Re: + avr32-dma-mappingh.patch added to -mm tree

[Haavard Skinnemoen]

On Fri, 16 Feb 2007 14:00:53 -0800
akpm@linux-foundation.org wrote:

> Subject: avr32: dma-mapping.h
> From: "Gary Zambrano" <zambrano@broadcom.com>
> 
> Added dma_sync_single_range_for_cpu/device to dma-mapping.h in asm-avr32 to
> call dma_sync_single_for_cpu/device.  This patch enables b44 to compile on
> systems with these cpus.  This patch was created with the assumption that
> another method of dma_sync_single_range_for_cpu/device does not exist on these
> architectures.

Thanks. However, I have a couple of questions for the arch experts...

> +static inline void
> +dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
> +			      unsigned long offset, size_t size,
> +			      enum dma_data_direction direction)
> +{
> +	/* just sync everything, that's all the pci API can do */
> +	dma_sync_single_for_cpu(dev, dma_handle, offset+size, direction);

I'm a little curious about why we can't just do

dma_sync_single_for_cpu(dev, dma_handle + offset, size, direction);

instead?

Also, although not related to this patch in particular, I wonder if we
actually need to sync anything at all in the _for_cpu() functions.
These are analogous to dma_unmap_*(), right?

Haavard