forked from mirrors/linux
72fd97bf4e
Arm already returns (~(dma_addr_t)0x0) on mapping failures, so we can switch over to returning DMA_MAPPING_ERROR and let the core dma-mapping code handle the rest. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Russell King <rmk+kernel@armlinux.org.uk> Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
39 lines
991 B
C
39 lines
991 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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/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/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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unsigned long **bitmaps; /* array of bitmaps */
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unsigned int nr_bitmaps; /* nr of elements in array */
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unsigned int extensions;
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size_t bitmap_size; /* size of a single bitmap */
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size_t bits; /* per bitmap */
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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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struct dma_iommu_mapping *
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arm_iommu_create_mapping(struct bus_type *bus, dma_addr_t base, u64 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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int arm_dma_supported(struct device *dev, u64 mask);
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#endif /* __KERNEL__ */
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#endif
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