[I/OAT]: DMA memcpy subsystem

Provides an API for offloading memory copies to DMA devices
Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/Kconfig

@@ -72,4 +72,6 @@ source "drivers/edac/Kconfig"
 
 source "drivers/rtc/Kconfig"
 
+source "drivers/dma/Kconfig"
+
 endmenu

drivers/Makefile

@@ -74,3 +74,4 @@ obj-$(CONFIG_SGI_SN)		+= sn/
 obj-y				+= firmware/
 obj-$(CONFIG_CRYPTO)		+= crypto/
 obj-$(CONFIG_SUPERH)		+= sh/
+obj-$(CONFIG_DMA_ENGINE)	+= dma/

drivers/dma/Kconfig

+#
+# DMA engine configuration
+#
+
+menu "DMA Engine support"
+
+config DMA_ENGINE
+	bool "Support for DMA engines"
+	---help---
+	  DMA engines offload copy operations from the CPU to dedicated
+	  hardware, allowing the copies to happen asynchronously.
+
+endmenu

drivers/dma/Makefile

+obj-y += dmaengine.o