drivers/pci/iova.h

   1 /*
   2  * Copyright (c) 2006, Intel Corporation.
   3  *
   4  * This file is released under the GPLv2.
   5  *
   6 <<<<<<< HEAD:drivers/pci/iova.h
   7  * Copyright (C) 2006 Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8 =======
   9  * Copyright (C) 2006-2008 Intel Corporation
  10  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
  11 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/pci/iova.h
  12  *
  13  */
  14
  15 #ifndef _IOVA_H_
  16 #define _IOVA_H_
  17
  18 #include <linux/types.h>
  19 #include <linux/kernel.h>
  20 #include <linux/rbtree.h>
  21 #include <linux/dma-mapping.h>
  22
  23 /* IO virtual address start page frame number */
  24 #define IOVA_START_PFN          (1)
  25
  26 /* iova structure */
  27 struct iova {
  28         struct rb_node  node;
  29         unsigned long   pfn_hi; /* IOMMU dish out addr hi */
  30         unsigned long   pfn_lo; /* IOMMU dish out addr lo */
  31 };
  32
  33 /* holds all the iova translations for a domain */
  34 struct iova_domain {
  35         spinlock_t      iova_alloc_lock;/* Lock to protect iova  allocation */
  36         spinlock_t      iova_rbtree_lock; /* Lock to protect update of rbtree */
  37         struct rb_root  rbroot;         /* iova domain rbtree root */
  38         struct rb_node  *cached32_node; /* Save last alloced node */
  39         unsigned long   dma_32bit_pfn;
  40 };
  41
  42 struct iova *alloc_iova_mem(void);
  43 void free_iova_mem(struct iova *iova);
  44 void free_iova(struct iova_domain *iovad, unsigned long pfn);
  45 void __free_iova(struct iova_domain *iovad, struct iova *iova);
  46 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
  47         unsigned long limit_pfn,
  48         bool size_aligned);
  49 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
  50         unsigned long pfn_hi);
  51 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
  52 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
  53 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
  54 void put_iova_domain(struct iova_domain *iovad);
  55
  56 #endif