Commit 1b0fac45 authored by Dan Williams's avatar Dan Williams Committed by Linus Torvalds

dma-mapping: prevent dma dependent code from linking on !HAS_DMA archs

Continuing the work started in 411f0f3e ...

This enables code with a dma path, that compiles away, to build without
requiring additional code factoring.  It also prevents code that calls
dma_alloc_coherent and dma_free_coherent from linking whereas previously
the code would hit a BUG() at run time.  Finally, it allows archs that set
!HAS_DMA to delete their asm/dma-mapping.h file.

Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: John W. Linville <linville@tuxdriver.com>
Cc: Kyle McMartin <kyle@parisc-linux.org>
Cc: James Bottomley <James.Bottomley@SteelEye.com>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Jeff Garzik <jeff@garzik.org>
Cc: <geert@linux-m68k.org>
Cc: <zippel@linux-m68k.org>
Cc: <spyro@f2s.com>
Cc: <ysato@users.sourceforge.jp>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9e7bf24b
......@@ -17,6 +17,9 @@ config MMU
bool
default y
config NO_DMA
def_bool y
config ARCH_ACORN
bool
default y
......
......@@ -68,6 +68,9 @@ config TIME_LOW_RES
config NO_IOPORT
def_bool y
config NO_DMA
def_bool y
config ISA
bool
default y
......
......@@ -31,6 +31,9 @@ config GENERIC_IRQ_PROBE
config NO_IOPORT
def_bool y
config NO_DMA
def_bool y
source "init/Kconfig"
......
......@@ -3,7 +3,7 @@
#
menu "DMA Engine support"
depends on !S390
depends on HAS_DMA
config DMA_ENGINE
bool "Support for DMA engines"
......
#include <asm-generic/dma-mapping-broken.h>
#ifndef _ASM_GENERIC_DMA_MAPPING_H
#define _ASM_GENERIC_DMA_MAPPING_H
/* This is used for archs that do not support DMA */
/* define the dma api to allow compilation but not linking of
* dma dependent code. Code that depends on the dma-mapping
* API needs to set 'depends on HAS_DMA' in its Kconfig
*/
static inline void *
struct scatterlist;
extern void *
dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *dma_handle,
gfp_t flag)
{
BUG();
return NULL;
}
gfp_t flag);
static inline void
extern void
dma_free_coherent(struct device *dev, size_t size, void *cpu_addr,
dma_addr_t dma_handle)
{
BUG();
}
dma_addr_t dma_handle);
#define dma_alloc_noncoherent(d, s, h, f) dma_alloc_coherent(d, s, h, f)
#define dma_free_noncoherent(d, s, v, h) dma_free_coherent(d, s, v, h)
extern dma_addr_t
dma_map_single(struct device *dev, void *ptr, size_t size,
enum dma_data_direction direction);
extern void
dma_unmap_single(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction direction);
extern int
dma_map_sg(struct device *dev, struct scatterlist *sg, int nents,
enum dma_data_direction direction);
extern void
dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries,
enum dma_data_direction direction);
extern dma_addr_t
dma_map_page(struct device *dev, struct page *page, unsigned long offset,
size_t size, enum dma_data_direction direction);
extern void
dma_unmap_page(struct device *dev, dma_addr_t dma_address, size_t size,
enum dma_data_direction direction);
extern void
dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, size_t size,
enum dma_data_direction direction);
extern void
dma_sync_single_range_for_cpu(struct device *dev, dma_addr_t dma_handle,
unsigned long offset, size_t size,
enum dma_data_direction direction);
extern void
dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems,
enum dma_data_direction direction);
#define dma_sync_single_for_device dma_sync_single_for_cpu
#define dma_sync_single_range_for_device dma_sync_single_range_for_cpu
#define dma_sync_sg_for_device dma_sync_sg_for_cpu
extern int
dma_mapping_error(dma_addr_t dma_addr);
extern int
dma_supported(struct device *dev, u64 mask);
extern int
dma_set_mask(struct device *dev, u64 mask);
extern int
dma_get_cache_alignment(void);
extern int
dma_is_consistent(struct device *dev, dma_addr_t dma_handle);
extern void
dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction direction);
#endif /* _ASM_GENERIC_DMA_MAPPING_H */
#include <asm-generic/dma-mapping-broken.h>
#ifndef _ASM_M32R_DMA_MAPPING_H
#define _ASM_M32R_DMA_MAPPING_H
#include <asm-generic/dma-mapping-broken.h>
#endif /* _ASM_M32R_DMA_MAPPING_H */
/*
* include/asm-s390/dma-mapping.h
*
* S390 version
*
* This file exists so that #include <dma-mapping.h> doesn't break anything.
*/
#ifndef _ASM_DMA_MAPPING_H
#define _ASM_DMA_MAPPING_H
#endif /* _ASM_DMA_MAPPING_H */
......@@ -31,7 +31,11 @@ static inline int valid_dma_direction(int dma_direction)
(dma_direction == DMA_FROM_DEVICE));
}
#ifdef CONFIG_HAS_DMA
#include <asm/dma-mapping.h>
#else
#include <asm-generic/dma-mapping-broken.h>
#endif
/* Backwards compat, remove in 2.7.x */
#define dma_sync_single dma_sync_single_for_cpu
......
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