1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/dma-direct.h> 3 #include <linux/export.h> 4 5 /* Set this to 1 if there is a HW IOMMU in the system */ 6 int iommu_detected __read_mostly; 7 8 const struct dma_map_ops *dma_ops; 9 EXPORT_SYMBOL(dma_ops); 10 11 #ifdef CONFIG_SWIOTLB 12 void *arch_dma_alloc(struct device *dev, size_t size, 13 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) 14 { 15 return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs); 16 } 17 18 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, 19 dma_addr_t dma_addr, unsigned long attrs) 20 { 21 dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs); 22 } 23 24 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, 25 dma_addr_t dma_addr) 26 { 27 return page_to_pfn(virt_to_page(cpu_addr)); 28 } 29 #endif 30