dma-iommu.h (908B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef ASMARM_DMA_IOMMU_H 3#define ASMARM_DMA_IOMMU_H 4 5#ifdef __KERNEL__ 6 7#include <linux/mm_types.h> 8#include <linux/scatterlist.h> 9#include <linux/kref.h> 10 11struct dma_iommu_mapping { 12 /* iommu specific data */ 13 struct iommu_domain *domain; 14 15 unsigned long **bitmaps; /* array of bitmaps */ 16 unsigned int nr_bitmaps; /* nr of elements in array */ 17 unsigned int extensions; 18 size_t bitmap_size; /* size of a single bitmap */ 19 size_t bits; /* per bitmap */ 20 dma_addr_t base; 21 22 spinlock_t lock; 23 struct kref kref; 24}; 25 26struct dma_iommu_mapping * 27arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 size); 28 29void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping); 30 31int arm_iommu_attach_device(struct device *dev, 32 struct dma_iommu_mapping *mapping); 33void arm_iommu_detach_device(struct device *dev); 34 35#endif /* __KERNEL__ */ 36#endif