drivers/pci/iova.h

   1 /*
   2  * Copyright (c) 2006, Intel Corporation.
   3  *
   4  * This file is released under the GPLv2.
   5  *
   6  * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   7  *
   8  */
   9
  10 #ifndef _IOVA_H_
  11 #define _IOVA_H_
  12
  13 #include <linux/types.h>
  14 #include <linux/kernel.h>
  15 #include <linux/rbtree.h>
  16 #include <linux/dma-mapping.h>
  17
  18 /* IO virtual address start page frame number */
  19 #define IOVA_START_PFN          (1)
  20
  21 /* iova structure */
  22 struct iova {
  23         struct rb_node  node;
  24         unsigned long   pfn_hi; /* IOMMU dish out addr hi */
  25         unsigned long   pfn_lo; /* IOMMU dish out addr lo */
  26 };
  27
  28 /* holds all the iova translations for a domain */
  29 struct iova_domain {
  30         spinlock_t      iova_alloc_lock;/* Lock to protect iova  allocation */
  31         spinlock_t      iova_rbtree_lock; /* Lock to protect update of rbtree */
  32         struct rb_root  rbroot;         /* iova domain rbtree root */
  33         struct rb_node  *cached32_node; /* Save last alloced node */
  34         unsigned long   dma_32bit_pfn;
  35 };
  36
  37 struct iova *alloc_iova_mem(void);
  38 void free_iova_mem(struct iova *iova);
  39 void free_iova(struct iova_domain *iovad, unsigned long pfn);
  40 void __free_iova(struct iova_domain *iovad, struct iova *iova);
  41 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
  42         unsigned long limit_pfn,
  43         bool size_aligned);
  44 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
  45         unsigned long pfn_hi);
  46 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
  47 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
  48 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
  49 void put_iova_domain(struct iova_domain *iovad);
  50
  51 #endif