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Date:	Thu, 6 Mar 2014 17:19:52 +0800
From:	Santosh Shilimkar <>
To:	<>
CC:	<>,
	Santosh Shilimkar <>,
	Greg Kroah-Hartman <>,
	Russell King <>,
	Arnd Bergmann <>, Olof Johansson <>,
	Grant Likely <>,
	Rob Herring <>,
	Catalin Marinas <>,
	Linus Walleij <>,
	Grygorii Strashko <>
Subject: [PATCH 1/7] device: introduce per device dma_pfn_offset

On few architectures, there are few restrictions on DMAble area of system
RAM. That also means that devices needs to know about this restrictions so
that the dma_masks can be updated accordingly and dma address translation
helpers can add/subtract the dma offset.

In most of cases DMA addresses can be performed using offset value of
Bus address space relatively to physical address space as following:

PFN->DMA:  __pfn_to_phys(pfn + [-]dma_pfn_offset)
DMA->PFN:  __phys_to_pfn(dma_addr) + [-]dma_pfn_offset

So we introduce per device dma_pfn_offset which can be popullated
by architectures init code while creating the devices.

Cc: Greg Kroah-Hartman <>
Cc: Russell King <>
Cc: Arnd Bergmann <>
Cc: Olof Johansson <>
Cc: Grant Likely <>
Cc: Rob Herring <>
Cc: Catalin Marinas <>
Cc: Linus Walleij <>
Signed-off-by: Grygorii Strashko <>
Signed-off-by: Santosh Shilimkar <>
 include/linux/device.h |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index 952b010..6940b25 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -688,6 +688,7 @@ struct acpi_dev_node {
  * @coherent_dma_mask: Like dma_mask, but for alloc_coherent mapping as not all
  * 		hardware supports 64-bit addresses for consistent allocations
  * 		such descriptors.
+ * @dma_pfn_offset: offset of DMA memory range relatively of RAM
  * @dma_parms:	A low level driver may set these to teach IOMMU code about
  * 		segment limitations.
  * @dma_pools:	Dma pools (if dma'ble device).
@@ -753,6 +754,7 @@ struct device {
 					     not all hardware supports
 					     64 bit addresses for consistent
 					     allocations such descriptors. */
+	unsigned long	dma_pfn_offset;
 	struct device_dma_parameters *dma_parms;

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