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Commit 1fe53268 authored by Dmitry Eremin-Solenikov's avatar Dmitry Eremin-Solenikov Committed by Ingo Molnar
Browse files

ARM: support generic per-device coherent dma mem 



Signed-off-by: default avatarDmitry Baryshkov <dbaryshkov@gmail.com>
Cc: Jesse Barnes <jbarnes@virtuousgeek.org>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 538c29d4

arch/arm/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ config ARM 
	select HAVE_KRETPROBES if (HAVE_KPROBES)

	select HAVE_FTRACE if (!XIP_KERNEL)

	select HAVE_DYNAMIC_FTRACE if (HAVE_FTRACE)

	select HAVE_GENERIC_DMA_COHERENT

	help

	  The ARM series is a line of low-power-consumption RISC chip designs

	  licensed by ARM Ltd and targeted at embedded applications and

arch/arm/mm/consistent.c

+8 −0
Original line number Diff line number Diff line
@@ -274,6 +274,11 @@ __dma_alloc(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp, 
void *

dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)

{

	void *memory;



	if (dma_alloc_from_coherent(dev, size, handle, &memory))

		return memory;



	if (arch_is_coherent()) {

		void *virt;
@@ -362,6 +367,9 @@ void dma_free_coherent(struct device *dev, size_t size, void *cpu_addr, dma_addr 


	WARN_ON(irqs_disabled());



	if (dma_release_from_coherent(dev, get_order(size), cpu_addr))

		return;



	if (arch_is_coherent()) {

		kfree(cpu_addr);

		return;

include/asm-arm/dma-mapping.h

+2 −0
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ 


#include <linux/scatterlist.h>



#include <asm-generic/dma-coherent.h>



/*

 * DMA-consistent mapping functions.  These allocate/free a region of

 * uncached, unwrite-buffered mapped memory space for use with DMA