include/linux/vhost_iotlb.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _LINUX_VHOST_IOTLB_H
0003 #define _LINUX_VHOST_IOTLB_H
0004
0005 #include <linux/interval_tree_generic.h>
0006
0007 struct vhost_iotlb_map {
0008     struct rb_node rb;
0009     struct list_head link;
0010     u64 start;
0011     u64 last;
0012     u64 size;
0013     u64 addr;
0014 #define VHOST_MAP_RO 0x1
0015 #define VHOST_MAP_WO 0x2
0016 #define VHOST_MAP_RW 0x3
0017     u32 perm;
0018     u32 flags_padding;
0019     u64 __subtree_last;
0020     void *opaque;
0021 };
0022
0023 #define VHOST_IOTLB_FLAG_RETIRE 0x1
0024
0025 struct vhost_iotlb {
0026     struct rb_root_cached root;
0027     struct list_head list;
0028     unsigned int limit;
0029     unsigned int nmaps;
0030     unsigned int flags;
0031 };
0032
0033 int vhost_iotlb_add_range_ctx(struct vhost_iotlb *iotlb, u64 start, u64 last,
0034                   u64 addr, unsigned int perm, void *opaque);
0035 int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
0036               u64 addr, unsigned int perm);
0037 void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
0038
0039 void vhost_iotlb_init(struct vhost_iotlb *iotlb, unsigned int limit,
0040               unsigned int flags);
0041 struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
0042 void vhost_iotlb_free(struct vhost_iotlb *iotlb);
0043 void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
0044
0045 struct vhost_iotlb_map *
0046 vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
0047 struct vhost_iotlb_map *
0048 vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
0049
0050 void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
0051               struct vhost_iotlb_map *map);
0052 #endif