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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/sparc/kernel/iommu_common.h
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/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.

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 *

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 * Copyright (C) 1999, 2008 David S. Miller ([email protected])

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 */

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#ifndef _IOMMU_COMMON_H

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#define _IOMMU_COMMON_H

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#include <linux/kernel.h>

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#include <linux/types.h>

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#include <linux/sched.h>

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#include <linux/mm.h>

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#include <linux/scatterlist.h>

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#include <linux/device.h>

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#include <linux/iommu-helper.h>

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#include <asm/iommu.h>

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#include <asm/scatterlist.h>

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/*

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 * These give mapping size of each iommu pte/tlb.

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 */

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#define IO_PAGE_SHIFT			13

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#define IO_PAGE_SIZE			(1UL << IO_PAGE_SHIFT)

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#define IO_PAGE_MASK			(~(IO_PAGE_SIZE-1))

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#define IO_PAGE_ALIGN(addr)		ALIGN(addr, IO_PAGE_SIZE)

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#define IO_TSB_ENTRIES			(128*1024)

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#define IO_TSB_SIZE			(IO_TSB_ENTRIES * 8)

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/*

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 * This is the hardwired shift in the iotlb tag/data parts.

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 */

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#define IOMMU_PAGE_SHIFT		13

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#define SG_ENT_PHYS_ADDRESS(SG)	(__pa(sg_virt((SG))))

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static inline int is_span_boundary(unsigned long entry,

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				   unsigned long shift,

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				   unsigned long boundary_size,

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				   struct scatterlist *outs,

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				   struct scatterlist *sg)

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{

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	unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);

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	int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,

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				 IO_PAGE_SIZE);

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	return iommu_is_span_boundary(entry, nr, shift, boundary_size);

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}

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extern unsigned long iommu_range_alloc(struct device *dev,

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				       struct iommu *iommu,

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				       unsigned long npages,

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				       unsigned long *handle);

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extern void iommu_range_free(struct iommu *iommu,

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			     dma_addr_t dma_addr,

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			     unsigned long npages);

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#endif /* _IOMMU_COMMON_H */

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