1 // SPDX-License-Identifier: GPL-2.0 2 #include <linux/dma-direct.h> 3 #include <linux/swiotlb.h> 4 #include <linux/export.h> 5 6 /* Set this to 1 if there is a HW IOMMU in the system */ 7 int iommu_detected __read_mostly; 8 9 const struct dma_map_ops *dma_ops; 10 EXPORT_SYMBOL(dma_ops); 11 12 #ifdef CONFIG_SWIOTLB 13 void *arch_dma_alloc(struct device *dev, size_t size, 14 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs) 15 { 16 return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs); 17 } 18 19 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr, 20 dma_addr_t dma_addr, unsigned long attrs) 21 { 22 dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs); 23 } 24 25 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr, 26 dma_addr_t dma_addr) 27 { 28 return page_to_pfn(virt_to_page(cpu_addr)); 29 } 30 31 void __init swiotlb_dma_init(void) 32 { 33 swiotlb_init(1); 34 } 35 #endif 36