root/arch/sparc/kernel/iommu_common.h

INCLUDED FROM

DEFINITIONS

1. is_span_boundary

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
   3  *
   4  * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
   5  */
   6 
   7 #ifndef _IOMMU_COMMON_H
   8 #define _IOMMU_COMMON_H
   9 
  10 #include <linux/kernel.h>
  11 #include <linux/types.h>
  12 #include <linux/sched.h>
  13 #include <linux/mm.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/device.h>
  16 #include <linux/iommu-helper.h>
  17 
  18 #include <asm/iommu.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)             ALIGN(addr, IO_PAGE_SIZE)
  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 int is_span_boundary(unsigned long entry,
  39                                    unsigned long shift,
  40                                    unsigned long boundary_size,
  41                                    struct scatterlist *outs,
  42                                    struct scatterlist *sg)
  43 {
  44         unsigned long paddr = SG_ENT_PHYS_ADDRESS(outs);
  45         int nr = iommu_num_pages(paddr, outs->dma_length + sg->length,
  46                                  IO_PAGE_SIZE);
  47 
  48         return iommu_is_span_boundary(entry, nr, shift, boundary_size);
  49 }
  50 
  51 #endif /* _IOMMU_COMMON_H */