On Mon, Jun 24, 2013 at 08:17:59AM +0300, Hiroshi Doyu wrote: > Ok, thanks. One more question, IOMMU H/W sometimes supports more > platform specific attributes than READ/WRITE. For example, in OMAP, > > #define IOMMU_FLAG (IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_8) > > Is there any way to deal with those platform specific attrs from DMA > mapping API POV? Depends on the kind of flag and whether you want to make it changeable from the DMA-API. The AMD IOMMU for example has a flag in the page-tables to force PCI DMA coherency. This is always set by the driver. For other parameters that should be changeable and don't fit into the dma_direction parameter in some way the use of dma_attr would make sense. Joerg -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
