62 lines
1.3 KiB
C
62 lines
1.3 KiB
C
#ifndef ASMARM_DMA_IOMMU_H
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#define ASMARM_DMA_IOMMU_H
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#ifdef __KERNEL__
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#include <linux/err.h>
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#include <linux/mm_types.h>
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#include <linux/scatterlist.h>
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#include <linux/dma-debug.h>
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#include <linux/kmemcheck.h>
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#include <linux/kref.h>
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struct dma_iommu_mapping {
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/* iommu specific data */
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struct iommu_domain *domain;
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void *bitmap;
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size_t bits;
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dma_addr_t base;
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spinlock_t lock;
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struct kref kref;
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};
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#ifdef CONFIG_ARM64_DMA_USE_IOMMU
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struct dma_iommu_mapping *
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arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size);
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void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping);
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int arm_iommu_attach_device(struct device *dev,
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struct dma_iommu_mapping *mapping);
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void arm_iommu_detach_device(struct device *dev);
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#else /* !CONFIG_ARM64_DMA_USE_IOMMU */
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static inline struct dma_iommu_mapping *
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arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, size_t size)
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{
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return ERR_PTR(-ENOMEM);
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}
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static inline void arm_iommu_release_mapping(struct dma_iommu_mapping *mapping)
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{
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}
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static inline int arm_iommu_attach_device(struct device *dev,
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struct dma_iommu_mapping *mapping)
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{
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return -ENODEV;
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}
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static inline void arm_iommu_detach_device(struct device *dev)
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{
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}
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#endif /* CONFIG_ARM64_DMA_USE_IOMMU */
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#endif /* __KERNEL__ */
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#endif
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