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0bbe30668d
This patch factors out IOTLB into a dedicated module in order to be reused by other modules like vringh. User may choose to enable the automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit for the case of vhost device IOTLB implementation. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200326140125.19794-4-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_VHOST_IOTLB_H
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#define _LINUX_VHOST_IOTLB_H
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#include <linux/interval_tree_generic.h>
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struct vhost_iotlb_map {
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struct rb_node rb;
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struct list_head link;
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u64 start;
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u64 last;
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u64 size;
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u64 addr;
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#define VHOST_MAP_RO 0x1
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#define VHOST_MAP_WO 0x2
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#define VHOST_MAP_RW 0x3
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u32 perm;
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u32 flags_padding;
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u64 __subtree_last;
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};
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#define VHOST_IOTLB_FLAG_RETIRE 0x1
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struct vhost_iotlb {
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struct rb_root_cached root;
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struct list_head list;
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unsigned int limit;
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unsigned int nmaps;
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unsigned int flags;
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};
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int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
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u64 addr, unsigned int perm);
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void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
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struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
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void vhost_iotlb_free(struct vhost_iotlb *iotlb);
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void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
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struct vhost_iotlb_map *
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vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
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struct vhost_iotlb_map *
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vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
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void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
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struct vhost_iotlb_map *map);
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#endif
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