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iommu_common.h

/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
 *
 * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
 */

#ifndef _IOMMU_COMMON_H
#define _IOMMU_COMMON_H

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/scatterlist.h>
#include <linux/device.h>
#include <linux/iommu-helper.h>

#include <asm/iommu.h>
#include <asm/scatterlist.h>

/*
 * These give mapping size of each iommu pte/tlb.
 */
#define IO_PAGE_SHIFT               13
#define IO_PAGE_SIZE                (1UL << IO_PAGE_SHIFT)
#define IO_PAGE_MASK                (~(IO_PAGE_SIZE-1))
#define IO_PAGE_ALIGN(addr)         ALIGN(addr, IO_PAGE_SIZE)

#define IO_TSB_ENTRIES              (128*1024)
#define IO_TSB_SIZE                 (IO_TSB_ENTRIES * 8)

/*
 * This is the hardwired shift in the iotlb tag/data parts.
 */
#define IOMMU_PAGE_SHIFT            13

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

static inline unsigned long iommu_num_pages(unsigned long vaddr,
                                  unsigned long slen)
{
      unsigned long npages;

      npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
      npages >>= IO_PAGE_SHIFT;

      return npages;
}

static inline int is_span_boundary(unsigned long entry,
                           unsigned long shift,
                           unsigned long boundary_size,
                           struct scatterlist *outs,
                           struct scatterlist *sg)
{
      unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
      int nr = iommu_num_pages(paddr, outs->dma_length + sg->length);

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

extern unsigned long iommu_range_alloc(struct device *dev,
                               struct iommu *iommu,
                               unsigned long npages,
                               unsigned long *handle);
extern void iommu_range_free(struct iommu *iommu,
                       dma_addr_t dma_addr,
                       unsigned long npages);

#endif /* _IOMMU_COMMON_H */

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