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mm/cma: Move dma contiguous changes into a seperate config

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We want to use CMA for allocating hash page table and real mode area for
PPC64. Hence move DMA contiguous related changes into a seperate config
so that ppc64 can enable CMA without requiring DMA contiguous.

Acked-by: Michal Nazarewicz <mina86@mina86.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
[removed defconfig changes]
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
This commit is contained in:
Aneesh Kumar K.V 2013-07-02 11:15:15 +05:30 committed by Marek Szyprowski
parent 8bb495e3f0
commit f825c736e7
6 changed files with 34 additions and 22 deletions
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2
arch/arm/include/asm/dma-contiguous.h
View File

@ -2,7 +2,7 @@
#define ASMARM_DMA_CONTIGUOUS_H
#ifdef __KERNEL__
#ifdef CONFIG_CMA
#ifdef CONFIG_DMA_CMA
#include <linux/types.h>
#include <asm-generic/dma-contiguous.h>

6
arch/arm/mm/dma-mapping.c
View File

@ -358,7 +358,7 @@ static int __init atomic_pool_init(void)
if (!pages)
goto no_pages;
if (IS_ENABLED(CONFIG_CMA))
if (IS_ENABLED(CONFIG_DMA_CMA))
ptr = __alloc_from_contiguous(NULL, pool->size, prot, &page,
atomic_pool_init);
else
@ -670,7 +670,7 @@ static void *__dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
addr = __alloc_simple_buffer(dev, size, gfp, &page);
else if (!(gfp & __GFP_WAIT))
addr = __alloc_from_pool(size, &page);
else if (!IS_ENABLED(CONFIG_CMA))
else if (!IS_ENABLED(CONFIG_DMA_CMA))
addr = __alloc_remap_buffer(dev, size, gfp, prot, &page, caller);
else
addr = __alloc_from_contiguous(dev, size, prot, &page, caller);
@ -759,7 +759,7 @@ static void __arm_dma_free(struct device *dev, size_t size, void *cpu_addr,
__dma_free_buffer(page, size);
} else if (__free_from_pool(cpu_addr, size)) {
return;
} else if (!IS_ENABLED(CONFIG_CMA)) {
} else if (!IS_ENABLED(CONFIG_DMA_CMA)) {
__dma_free_remap(cpu_addr, size);
__dma_free_buffer(page, size);
} else {

20
drivers/base/Kconfig
View File

@ -202,11 +202,9 @@ config DMA_SHARED_BUFFER
APIs extension; the file's descriptor can then be passed on to other
driver.
config CMA
bool "Contiguous Memory Allocator"
depends on HAVE_DMA_CONTIGUOUS && HAVE_MEMBLOCK
select MIGRATION
select MEMORY_ISOLATION
config DMA_CMA
bool "DMA Contiguous Memory Allocator"
depends on HAVE_DMA_CONTIGUOUS && CMA
help
This enables the Contiguous Memory Allocator which allows drivers
to allocate big physically-contiguous blocks of memory for use with
@ -215,17 +213,7 @@ config CMA
For more information see <include/linux/dma-contiguous.h>.
If unsure, say "n".
if CMA
config CMA_DEBUG
bool "CMA debug messages (DEVELOPMENT)"
depends on DEBUG_KERNEL
help
Turns on debug messages in CMA. This produces KERN_DEBUG
messages for every CMA call as well as various messages while
processing calls such as dma_alloc_from_contiguous().
This option does not affect warning and error messages.
if DMA_CMA
comment "Default contiguous memory area size:"
config CMA_SIZE_MBYTES

2
drivers/base/Makefile
View File

@ -6,7 +6,7 @@ obj-y := core.o bus.o dd.o syscore.o \
attribute_container.o transport_class.o \
topology.o
obj-$(CONFIG_DEVTMPFS) += devtmpfs.o
obj-$(CONFIG_CMA) += dma-contiguous.o
obj-$(CONFIG_DMA_CMA) += dma-contiguous.o
obj-y += power/
obj-$(CONFIG_HAS_DMA) += dma-mapping.o
obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o

2
include/linux/dma-contiguous.h
View File

@ -57,7 +57,7 @@ struct cma;
struct page;
struct device;
#ifdef CONFIG_CMA
#ifdef CONFIG_DMA_CMA
/*
* There is always at least global CMA area and a few optional device

24
mm/Kconfig
View File

@ -477,3 +477,27 @@ config FRONTSWAP
and swap data is stored as normal on the matching swap device.
If unsure, say Y to enable frontswap.
config CMA
bool "Contiguous Memory Allocator"
depends on HAVE_MEMBLOCK
select MIGRATION
select MEMORY_ISOLATION
help
This enables the Contiguous Memory Allocator which allows other
subsystems to allocate big physically-contiguous blocks of memory.
CMA reserves a region of memory and allows only movable pages to
be allocated from it. This way, the kernel can use the memory for
pagecache and when a subsystem requests for contiguous area, the
allocated pages are migrated away to serve the contiguous request.
If unsure, say "n".
config CMA_DEBUG
bool "CMA debug messages (DEVELOPMENT)"
depends on DEBUG_KERNEL && CMA
help
Turns on debug messages in CMA. This produces KERN_DEBUG
messages for every CMA call as well as various messages while
processing calls such as dma_alloc_from_contiguous().
This option does not affect warning and error messages.