Messages in this thread Patch in this message | | | From | akepner@sgi ... | Date | Wed, 12 Mar 2008 21:00:22 -0700 | Subject | [PATCH 0/4 v4] dma: dma_{un}map_{single|sg}_attrs() interface |
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v3-v4 changes:
slight reorganization: split off one arch-independent patch, and moved both new include/linux/*.h files to the first patch in the series.
changed the name DMA_ATTR_SYNC_ON_WRITE to DMA_ATTR_BARRIER.
describe the semantics of DMA_ATTR_BARRIER in a very general, architecture-neutral way.
--- Introduce a new interface for passing architecture-specific attributes when memory is mapped and unmapped for DMA. Give the interface a default implementation which ignores attributes. Also introduce the dma_{set|get}_attr() interface for setting and retrieving individual attributes. Define one attribute DMA_ATTR_BARRIER in anticipation of its use by ia64/sn.
Signed-off-by: Arthur Kepner <akepner@sgi.com> Acked-by: Jesse Barnes <jesse.barnes@intel.com>
---
dma-attrs.h | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ dma-mapping.h | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+)
diff --git a/include/linux/dma-attrs.h b/include/linux/dma-attrs.h index e69de29..05b6e91 100644 --- a/include/linux/dma-attrs.h +++ b/include/linux/dma-attrs.h @@ -0,0 +1,55 @@ +#ifndef _DMA_ATTR_H +#define _DMA_ATTR_H + +enum dma_attr { + DMA_ATTR_BARRIER, + DMA_ATTR_MAX, +}; + +struct dma_attrs { + unsigned flags; +}; + +#define __DMA_ATTRS_INIT() { .flags = 0, } + +#define DECLARE_DMA_ATTRS(x) struct dma_attrs x = __DMA_ATTRS_INIT() + +#define INIT_DMA_ATTRS(x) (x)->flags = 0; + +#ifdef ARCH_USES_DMA_ATTRS +/* + * dma_set_attr - set a specific attribute + * may be called with a null attrs + */ +static inline int dma_set_attr(struct dma_attrs *attrs, enum dma_attr attr) +{ + if (!attrs) + return 0; + if (attr < DMA_ATTR_MAX) { + attrs->flags |= (1 << attr); + return 0; + } + return -EINVAL; +} + +/* + * dma_get_attr - check for a specific attribute + * may be called with a null attrs + */ +static inline int dma_get_attr(struct dma_attrs *attrs, enum dma_attr attr) +{ + if (!attrs) + return 0; + if (attr < DMA_ATTR_MAX) { + int ret = attrs->flags & (1 << attr); + return !!ret; + } + return -EINVAL; +} +#else /* !ARCH_USES_DMA_ATTRS */ +static inline int dma_set_attr(struct dma_attrs *attrs, enum dma_attr attr) +{ + return 0; +} +#endif /* ARCH_USES_DMA_ATTRS */ +#endif /* _DMA_ATTR_H */ diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 3320307..5a0e924 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -146,4 +146,39 @@ static inline void dmam_release_declared_memory(struct device *dev) } #endif /* ARCH_HAS_DMA_DECLARE_COHERENT_MEMORY */ +#ifndef ARCH_USES_DMA_ATTRS +struct dma_attrs; + +static inline dma_addr_t dma_map_single_attrs(struct device *dev, + void *cpu_addr, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return dma_map_single(dev, cpu_addr, size, dir); +} + +static inline void dma_unmap_single_attrs(struct device *dev, + dma_addr_t dma_addr, size_t size, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return dma_unmap_single(dev, dma_addr, size, dir); +} + +static inline int dma_map_sg_attrs(struct device *dev, struct scatterlist *sgl, + int nents, enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return dma_map_sg(dev, sgl, nents, dir); +} + +static inline void dma_unmap_sg_attrs(struct device *dev, + struct scatterlist *sgl, int nents, + enum dma_data_direction dir, + struct dma_attrs *attrs) +{ + return dma_unmap_sg(dev, sgl, nents, dir); +} +#endif /* ARCH_USES_DMA_ATTRS */ + #endif
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