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
arch_dma_alloc(struct device * dev,size_t size,dma_addr_t * dma_handle,gfp_t gfp,unsigned long attrs)11 void *arch_dma_alloc(struct device *dev, size_t size,
12 dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
13 {
14 return dma_direct_alloc_pages(dev, size, dma_handle, gfp, attrs);
15 }
16
arch_dma_free(struct device * dev,size_t size,void * cpu_addr,dma_addr_t dma_addr,unsigned long attrs)17 void arch_dma_free(struct device *dev, size_t size, void *cpu_addr,
18 dma_addr_t dma_addr, unsigned long attrs)
19 {
20 dma_direct_free_pages(dev, size, cpu_addr, dma_addr, attrs);
21 }
22
arch_dma_coherent_to_pfn(struct device * dev,void * cpu_addr,dma_addr_t dma_addr)23 long arch_dma_coherent_to_pfn(struct device *dev, void *cpu_addr,
24 dma_addr_t dma_addr)
25 {
26 return page_to_pfn(virt_to_page(cpu_addr));
27 }
28