Hi, On Tue, Aug 14, 2012 at 06:52:15PM +0100, Catalin Marinas wrote: > This patch adds support for the DMA mapping API. It uses dma_map_ops for > flexibility and it currently supports swiotlb. This patch could be > simplified further if the DMA accesses are coherent (not mandated by the > architecture) or if corresponding hooks are placed in the generic > swiotlb code to deal with cache maintenance. > > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > --- > arch/arm64/include/asm/dma-mapping.h | 124 ++++++++++++++++++++ > arch/arm64/mm/dma-mapping.c | 208 ++++++++++++++++++++++++++++++++++ > 2 files changed, 332 insertions(+), 0 deletions(-) > create mode 100644 arch/arm64/include/asm/dma-mapping.h > create mode 100644 arch/arm64/mm/dma-mapping.c > > diff --git a/arch/arm64/include/asm/dma-mapping.h b/arch/arm64/include/asm/dma-mapping.h > new file mode 100644 > index 0000000..538f4b4 > --- /dev/null > +++ b/arch/arm64/include/asm/dma-mapping.h > @@ -0,0 +1,124 @@ > +/* > + * Copyright (C) 2012 ARM Ltd. > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License version 2 as > + * published by the Free Software Foundation. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program. If not, see <http://www.gnu.org/licenses/>. > + */ > +#ifndef __ASM_DMA_MAPPING_H > +#define __ASM_DMA_MAPPING_H > + > +#ifdef __KERNEL__ > + > +#include <linux/types.h> > +#include <linux/vmalloc.h> > + > +#include <asm-generic/dma-coherent.h> > + > +#define ARCH_HAS_DMA_GET_REQUIRED_MASK > + > +extern struct dma_map_ops *dma_ops; > > +static inline struct dma_map_ops *get_dma_ops(struct device *dev) > +{ > + if (unlikely(!dev) || !dev->archdata.dma_ops) > + return dma_ops; > + else > + return dev->archdata.dma_ops; > +} Does it make sense to add the concept of a global dma ops on arm64, instead of requiring the dma ops pointer per device similar to how some other platforms do it (including powerpc)? For devices that lack archdata.dma_ops, dma_supported() should return 0 (and the other ops should return error). -Olof -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
