From 782e6769c0df744e773dc2acff71c974b3bba4e9 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 16 Apr 2018 15:24:51 +0200 Subject: dma-mapping: provide a generic dma-noncoherent implementation Add a new dma_map_ops implementation that uses dma-direct for the address mapping of streaming mappings, and which requires arch-specific implemenations of coherent allocate/free. Architectures have to provide flushing helpers to ownership trasnfers to the device and/or CPU, and can provide optional implementations of the coherent mmap functionality, and the cache_flush routines for non-coherent long term allocations. Signed-off-by: Christoph Hellwig Tested-by: Alexey Brodkin Acked-by: Vineet Gupta --- include/linux/dma-noncoherent.h | 47 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 include/linux/dma-noncoherent.h (limited to 'include/linux/dma-noncoherent.h') diff --git a/include/linux/dma-noncoherent.h b/include/linux/dma-noncoherent.h new file mode 100644 index 000000000000..10b2654d549b --- /dev/null +++ b/include/linux/dma-noncoherent.h @@ -0,0 +1,47 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _LINUX_DMA_NONCOHERENT_H +#define _LINUX_DMA_NONCOHERENT_H 1 + +#include + +void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle, + gfp_t gfp, unsigned long attrs); +void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, + dma_addr_t dma_addr, unsigned long attrs); + +#ifdef CONFIG_DMA_NONCOHERENT_MMAP +int arch_dma_mmap(struct device *dev, struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, size_t size, + unsigned long attrs); +#else +#define arch_dma_mmap NULL +#endif /* CONFIG_DMA_NONCOHERENT_MMAP */ + +#ifdef CONFIG_DMA_NONCOHERENT_CACHE_SYNC +void arch_dma_cache_sync(struct device *dev, void *vaddr, size_t size, + enum dma_data_direction direction); +#else +#define arch_dma_cache_sync NULL +#endif /* CONFIG_DMA_NONCOHERENT_CACHE_SYNC */ + +#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE +void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir); +#else +static inline void arch_sync_dma_for_device(struct device *dev, + phys_addr_t paddr, size_t size, enum dma_data_direction dir) +{ +} +#endif /* ARCH_HAS_SYNC_DMA_FOR_DEVICE */ + +#ifdef CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU +void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr, + size_t size, enum dma_data_direction dir); +#else +static inline void arch_sync_dma_for_cpu(struct device *dev, + phys_addr_t paddr, size_t size, enum dma_data_direction dir) +{ +} +#endif /* ARCH_HAS_SYNC_DMA_FOR_CPU */ + +#endif /* _LINUX_DMA_NONCOHERENT_H */ -- cgit v1.2.3-59-g8ed1b