// SPDX-License-Identifier: GPL-2.0/* * Dummy DMA ops that always fail. */#include <linux/dma-map-ops.h> static int dma_dummy_mmap(struct device *dev, struct vm_area_struct *vma,		void *cpu_addr, dma_addr_t dma_addr, size_t size,		unsigned long attrs){	return -ENXIO;} static dma_addr_t dma_dummy_map_phys(struct device *dev, phys_addr_t phys,		size_t size, enum dma_data_direction dir, unsigned long attrs){	return DMA_MAPPING_ERROR;}static void dma_dummy_unmap_phys(struct device *dev, dma_addr_t dma_handle,		size_t size, enum dma_data_direction dir, unsigned long attrs){	/*	 * Dummy ops doesn't support map_phys, so unmap_page should never be	 * called.	 */	WARN_ON_ONCE(true);} static int dma_dummy_map_sg(struct device *dev, struct scatterlist *sgl,		int nelems, enum dma_data_direction dir,		unsigned long attrs){	return -EINVAL;} static void dma_dummy_unmap_sg(struct device *dev, struct scatterlist *sgl,		int nelems, enum dma_data_direction dir,		unsigned long attrs){	/*	 * Dummy ops doesn't support map_sg, so unmap_sg should never be called.	 */	WARN_ON_ONCE(true);} static int dma_dummy_supported(struct device *hwdev, u64 mask){	return 0;} const struct dma_map_ops dma_dummy_ops = {	.mmap                   = dma_dummy_mmap,	.map_phys               = dma_dummy_map_phys,	.unmap_phys             = dma_dummy_unmap_phys,	.map_sg                 = dma_dummy_map_sg,	.unmap_sg               = dma_dummy_unmap_sg,	.dma_supported          = dma_dummy_supported,};