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 */
 6int iommu_detected __read_mostly;
 7
 8const struct dma_map_ops *dma_ops;
 9EXPORT_SYMBOL(dma_ops);
10
11void *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
17void 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
23long 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}

 1// SPDX-License-Identifier: GPL-2.0
 2#include <linux/dma-mapping.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 */
 7int iommu_detected __read_mostly;
 8
 9const struct dma_map_ops *dma_ops;
10EXPORT_SYMBOL(dma_ops);
11
12#define PREALLOC_DMA_DEBUG_ENTRIES (1 << 16)
13
14static int __init dma_init(void)
15{
16	dma_debug_init(PREALLOC_DMA_DEBUG_ENTRIES);
17
18	return 0;
19}
20fs_initcall(dma_init);
21
22const struct dma_map_ops *dma_get_ops(struct device *dev)
 
23{
24	return dma_ops;
25}
26EXPORT_SYMBOL(dma_get_ops);
27
28#ifdef CONFIG_SWIOTLB
29void __init swiotlb_dma_init(void)
30{
31	dma_ops = &swiotlb_dma_ops;
32	swiotlb_init(1);
33}
34#endif