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         void *opaque;
  21 };
  22
  23 #define VHOST_IOTLB_FLAG_RETIRE 0x1
  24
  25 struct vhost_iotlb {
  26         struct rb_root_cached root;
  27         struct list_head list;
  28         unsigned int limit;
  29         unsigned int nmaps;
  30         unsigned int flags;
  31 };
  32
  33 int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb, u64 start, u64 last,
  34                               u64 addr, unsigned int perm, void *opaque);
  35 int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
  36                           u64 addr, unsigned int perm);
  37 void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
  38
  39 void vhost_iotlb_init(struct vhost_iotlb *iotlb, unsigned int limit,
  40                       unsigned int flags);
  41 struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
  42 void vhost_iotlb_free(struct vhost_iotlb *iotlb);
  43 void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
  44
  45 struct vhost_iotlb_map *
  46 vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
  47 struct vhost_iotlb_map *
  48 vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
  49
  50 void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
  51                           struct vhost_iotlb_map *map);
  52 #endif