// 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_page(struct device *dev, struct page *page, unsigned long offset, size_t size, enum dma_data_direction dir, unsigned long attrs) { return DMA_MAPPING_ERROR; } 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 int dma_dummy_supported(struct device *hwdev, u64 mask) { return 0; } const struct dma_map_ops dma_dummy_ops = { .mmap = dma_dummy_mmap, .map_page = dma_dummy_map_page, .map_sg = dma_dummy_map_sg, .dma_supported = dma_dummy_supported, };