include/linux/vhost_iotlb.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_VHOST_IOTLB_H
   3 #define _LINUX_VHOST_IOTLB_H
   4
   5 #include <linux/interval_tree_generic.h>
   6
   7 struct vhost_iotlb_map {
   8         struct rb_node rb;
   9         struct list_head link;
  10         u64 start;
  11         u64 last;
  12         u64 size;
  13         u64 addr;
  14 #define VHOST_MAP_RO 0x1
  15 #define VHOST_MAP_WO 0x2
  16 #define VHOST_MAP_RW 0x3
  17         u32 perm;
  18         u32 flags_padding;
  19         u64 __subtree_last;
  20 };
  21
  22 #define VHOST_IOTLB_FLAG_RETIRE 0x1
  23
  24 struct vhost_iotlb {
  25         struct rb_root_cached root;
  26         struct list_head list;
  27         unsigned int limit;
  28         unsigned int nmaps;
  29         unsigned int flags;
  30 };
  31
  32 int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
  33                           u64 addr, unsigned int perm);
  34 void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
  35
  36 struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
  37 void vhost_iotlb_free(struct vhost_iotlb *iotlb);
  38 void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
  39
  40 struct vhost_iotlb_map *
  41 vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
  42 struct vhost_iotlb_map *
  43 vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
  44
  45 void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
  46                           struct vhost_iotlb_map *map);
  47 #endif