arch/sparc64/kernel/iommu_common.h

   1 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
   2  *
   3  * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
   4  */
   5
   6 #ifndef _IOMMU_COMMON_H
   7 #define _IOMMU_COMMON_H
   8
   9 #include <linux/kernel.h>
  10 #include <linux/types.h>
  11 #include <linux/sched.h>
  12 #include <linux/mm.h>
  13 #include <linux/scatterlist.h>
  14 #include <linux/device.h>
  15 #include <linux/iommu-helper.h>
  16
  17 #include <asm/iommu.h>
  18 #include <asm/scatterlist.h>
  19
  20 /*
  21  * These give mapping size of each iommu pte/tlb.
  22  */
  23 #define IO_PAGE_SHIFT                   13
  24 #define IO_PAGE_SIZE                    (1UL << IO_PAGE_SHIFT)
  25 #define IO_PAGE_MASK                    (~(IO_PAGE_SIZE-1))
  26 #define IO_PAGE_ALIGN(addr)             (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
  27
  28 #define IO_TSB_ENTRIES                  (128*1024)
  29 #define IO_TSB_SIZE                     (IO_TSB_ENTRIES * 8)
  30
  31 /*
  32  * This is the hardwired shift in the iotlb tag/data parts.
  33  */
  34 #define IOMMU_PAGE_SHIFT                13
  35
  36 #define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
  37
  38 static inline unsigned long iommu_num_pages(unsigned long vaddr,
  39                                             unsigned long slen)
  40 {
  41         unsigned long npages;
  42
  43         npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
  44         npages >>= IO_PAGE_SHIFT;
  45
  46         return npages;
  47 }
  48
  49 static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
  50 {
  51         unsigned long i, npages = 0;
  52         struct scatterlist *sg;
  53
  54         for_each_sg(sglist, sg, nelems, i) {
  55                 unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
  56                 npages += iommu_num_pages(paddr, sg->length);
  57         }
  58
  59         return npages;
  60 }
  61
  62 static inline int is_span_boundary(unsigned long entry,
  63                                    unsigned long shift,
  64                                    unsigned long boundary_size,
  65                                    struct scatterlist *outs,
  66                                    struct scatterlist *sg)
  67 {
  68         unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
  69         int nr = iommu_num_pages(paddr, outs->dma_length + sg->length);
  70
  71         return iommu_is_span_boundary(entry, nr, shift, boundary_size);
  72 }
  73
  74 extern unsigned long iommu_range_alloc(struct device *dev,
  75                                        struct iommu *iommu,
  76                                        unsigned long npages,
  77                                        unsigned long *handle);
  78 extern void iommu_range_free(struct iommu *iommu,
  79                              dma_addr_t dma_addr,
  80                              unsigned long npages);
  81
  82 #endif /* _IOMMU_COMMON_H */