Introduce the dma_flags_set/get_*() interfaces and give them default implementations.
Architectures which allow DMA to be reordered between a device and host memory (within a NUMA interconnect) can redefine these to allow a driver to explicitly synchronize DMA from the device when necessary. Signed-off-by: Arthur Kepner <[EMAIL PROTECTED]> --- Andrew, this is the first in a series of three patches: [1/3] dma: add dma_flags_set/get_*() interfaces [2/3] dma: redefine dma_flags_set/get_*() for sn-ia64 [3/3] dma: document dma_flags_set/get_*() Variants of these patches have been discussed on several occasions, most recently in a thread beginning: http://marc.info/?l=linux-kernel&m=119137949604365&w=2 Please consider this for 2.6.24. Jes, Tony, please note that I added an explicit test for CONFIG_IA64_SGI_SN2 in asm-ia64/sn/io.h (Yuck). This is needed for IA64_GENERIC to build, since there's at least one driver (qla1280) that includes asm-ia64/sn/io.h for CONFIG_IA64_GENERIC. dma-mapping.h | 18 ++++++++++++++++++ 1 files changed, 18 insertions(+) diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 0ebfafb..132b559 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -106,4 +106,22 @@ static inline void dmam_release_declared_memory(struct device *dev) } #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ +#define DMA_BARRIER_ATTR 0x1 +#ifndef ARCH_USES_DMA_ATTRS +static inline int dma_flags_set_attr(u32 attr, enum dma_data_direction dir) +{ + return dir; +} + +static inline int dma_flags_get_dir(int flags) +{ + return flags; +} + +static inline int dma_flags_get_attr(int flags) +{ + return 0; +} +#endif /* ARCH_USES_DMA_ATTRS */ + #endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
