/* SPDX-License-Identifier: GPL-2.0 *//* * Copyright (C) 2018 Christoph Hellwig. * * DMA operations that map physical memory directly without using an IOMMU. */#ifndef _KERNEL_DMA_DIRECT_H#define _KERNEL_DMA_DIRECT_H #include <linux/dma-direct.h> int dma_direct_get_sgtable(struct device *dev, struct sg_table *sgt,		void *cpu_addr, dma_addr_t dma_addr, size_t size,		unsigned long attrs);bool dma_direct_can_mmap(struct device *dev);int dma_direct_mmap(struct device *dev, struct vm_area_struct *vma,		void *cpu_addr, dma_addr_t dma_addr, size_t size,		unsigned long attrs);bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr);int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,		enum dma_data_direction dir, unsigned long attrs);size_t dma_direct_max_mapping_size(struct device *dev); #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE) || \    defined(CONFIG_SWIOTLB)void dma_direct_sync_sg_for_device(struct device *dev, struct scatterlist *sgl,		int nents, enum dma_data_direction dir);#elsestatic inline void dma_direct_sync_sg_for_device(struct device *dev,		struct scatterlist *sgl, int nents, enum dma_data_direction dir){}#endif #if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \    defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \    defined(CONFIG_SWIOTLB)void dma_direct_unmap_sg(struct device *dev, struct scatterlist *sgl,		int nents, enum dma_data_direction dir, unsigned long attrs);void dma_direct_sync_sg_for_cpu(struct device *dev,		struct scatterlist *sgl, int nents, enum dma_data_direction dir);#elsestatic inline void dma_direct_unmap_sg(struct device *dev,		struct scatterlist *sgl, int nents, enum dma_data_direction dir,		unsigned long attrs){}static inline void dma_direct_sync_sg_for_cpu(struct device *dev,		struct scatterlist *sgl, int nents, enum dma_data_direction dir){}#endif static inline void dma_direct_sync_single_for_device(struct device *dev,		dma_addr_t addr, size_t size, enum dma_data_direction dir){	phys_addr_t paddr = dma_to_phys(dev, addr); 	if (unlikely(is_swiotlb_buffer(paddr)))		swiotlb_sync_single_for_device(dev, paddr, size, dir); 	if (!dev_is_dma_coherent(dev))		arch_sync_dma_for_device(paddr, size, dir);} static inline void dma_direct_sync_single_for_cpu(struct device *dev,		dma_addr_t addr, size_t size, enum dma_data_direction dir){	phys_addr_t paddr = dma_to_phys(dev, addr); 	if (!dev_is_dma_coherent(dev)) {		arch_sync_dma_for_cpu(paddr, size, dir);		arch_sync_dma_for_cpu_all();	} 	if (unlikely(is_swiotlb_buffer(paddr)))		swiotlb_sync_single_for_cpu(dev, paddr, size, dir); 	if (dir == DMA_FROM_DEVICE)		arch_dma_mark_clean(paddr, size);} static inline dma_addr_t dma_direct_map_page(struct device *dev,		struct page *page, unsigned long offset, size_t size,		enum dma_data_direction dir, unsigned long attrs){	phys_addr_t phys = page_to_phys(page) + offset;	dma_addr_t dma_addr = phys_to_dma(dev, phys); 	if (unlikely(swiotlb_force == SWIOTLB_FORCE))		return swiotlb_map(dev, phys, size, dir, attrs); 	if (unlikely(!dma_capable(dev, dma_addr, size, true))) {		if (swiotlb_force != SWIOTLB_NO_FORCE)			return swiotlb_map(dev, phys, size, dir, attrs); 		dev_WARN_ONCE(dev, 1,			     "DMA addr %pad+%zu overflow (mask %llx, bus limit %llx).\n",			     &dma_addr, size, *dev->dma_mask, dev->bus_dma_limit);		return DMA_MAPPING_ERROR;	} 	if (!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC))		arch_sync_dma_for_device(phys, size, dir);	return dma_addr;} static inline void dma_direct_unmap_page(struct device *dev, dma_addr_t addr,		size_t size, enum dma_data_direction dir, unsigned long attrs){	phys_addr_t phys = dma_to_phys(dev, addr); 	if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))		dma_direct_sync_single_for_cpu(dev, addr, size, dir); 	if (unlikely(is_swiotlb_buffer(phys)))		swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs);}#endif /* _KERNEL_DMA_DIRECT_H */