Commit 002e6745 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

dma-direct: rename dma_noop to dma_direct 



The trivial direct mapping implementation already does a virtual to
physical translation which isn't strictly a noop, and will soon learn
to do non-direct but linear physical to dma translations through the
device offset and a few small tricks.  Rename it to a better fitting
name.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarVladimir Murzin <vladimir.murzin@arm.com>
parent c5cd037d

MAINTAINERS

+1 −1
Original line number Diff line number Diff line
@@ -4334,7 +4334,7 @@ T: git git://git.infradead.org/users/hch/dma-mapping.git 
W:	http://git.infradead.org/users/hch/dma-mapping.git

S:	Supported

F:	lib/dma-debug.c

F:	lib/dma-noop.c

F:	lib/dma-direct.c

F:	lib/dma-virt.c

F:	drivers/base/dma-mapping.c

F:	drivers/base/dma-coherent.c

arch/arm/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -25,7 +25,7 @@ config ARM 
	select CLONE_BACKWARDS

	select CPU_PM if (SUSPEND || CPU_IDLE)

	select DCACHE_WORD_ACCESS if HAVE_EFFICIENT_UNALIGNED_ACCESS

	select DMA_NOOP_OPS if !MMU

	select DMA_DIRECT_OPS if !MMU

	select EDAC_SUPPORT

	select EDAC_ATOMIC_SCRUB

	select GENERIC_ALLOCATOR

arch/arm/include/asm/dma-mapping.h

+1 −1
Original line number Diff line number Diff line
@@ -18,7 +18,7 @@ extern const struct dma_map_ops arm_coherent_dma_ops; 


static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)

{

	return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops;

	return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_direct_ops;

}



#ifdef __arch_page_to_dma

arch/arm/mm/dma-mapping-nommu.c

+4 −4
Original line number Diff line number Diff line
@@ -22,7 +22,7 @@ 
#include "dma.h"



/*

 *  dma_noop_ops is used if

 *  dma_direct_ops is used if

 *   - MMU/MPU is off

 *   - cpu is v7m w/o cache support

 *   - device is coherent
@@ -39,7 +39,7 @@ static void *arm_nommu_dma_alloc(struct device *dev, size_t size, 
				 unsigned long attrs)



{

	const struct dma_map_ops *ops = &dma_noop_ops;

	const struct dma_map_ops *ops = &dma_direct_ops;

	void *ret;



	/*
@@ -70,7 +70,7 @@ static void arm_nommu_dma_free(struct device *dev, size_t size, 
			       void *cpu_addr, dma_addr_t dma_addr,

			       unsigned long attrs)

{

	const struct dma_map_ops *ops = &dma_noop_ops;

	const struct dma_map_ops *ops = &dma_direct_ops;



	if (attrs & DMA_ATTR_NON_CONSISTENT) {

		ops->free(dev, size, cpu_addr, dma_addr, attrs);
@@ -213,7 +213,7 @@ EXPORT_SYMBOL(arm_nommu_dma_ops); 


static const struct dma_map_ops *arm_nommu_get_dma_map_ops(bool coherent)

{

	return coherent ? &dma_noop_ops : &arm_nommu_dma_ops;

	return coherent ? &dma_direct_ops : &arm_nommu_dma_ops;

}



void arch_setup_dma_ops(struct device *dev, u64 dma_base, u64 size,

arch/m32r/Kconfig

+1 −1
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ config M32R 
	select MODULES_USE_ELF_RELA

	select HAVE_DEBUG_STACKOVERFLOW

	select CPU_NO_EFFICIENT_FFS

	select DMA_NOOP_OPS

	select DMA_DIRECT_OPS

	select ARCH_NO_COHERENT_DMA_MMAP if !MMU



config SBUS

CRA Git | Maintained and supported by SUSTech CRA and CCSE