1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * MMU-based software IOTLB.
5 * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
7 * Author: Xie Yongji <xieyongji@bytedance.com>
11 #ifndef _VDUSE_IOVA_DOMAIN_H
12 #define _VDUSE_IOVA_DOMAIN_H
14 #include <linux/iova.h>
15 #include <linux/dma-mapping.h>
16 #include <linux/vhost_iotlb.h>
18 #define IOVA_START_PFN 1
20 #define INVALID_PHYS_ADDR (~(phys_addr_t)0)
22 struct vduse_bounce_map {
23 struct page *bounce_page;
27 struct vduse_iova_domain {
28 struct iova_domain stream_iovad;
29 struct iova_domain consistent_iovad;
30 struct vduse_bounce_map *bounce_maps;
32 unsigned long iova_limit;
34 struct vhost_iotlb *iotlb;
35 spinlock_t iotlb_lock;
39 int vduse_domain_set_map(struct vduse_iova_domain *domain,
40 struct vhost_iotlb *iotlb);
42 void vduse_domain_clear_map(struct vduse_iova_domain *domain,
43 struct vhost_iotlb *iotlb);
45 dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
46 struct page *page, unsigned long offset,
47 size_t size, enum dma_data_direction dir,
50 void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
51 dma_addr_t dma_addr, size_t size,
52 enum dma_data_direction dir, unsigned long attrs);
54 void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain,
55 size_t size, dma_addr_t *dma_addr,
56 gfp_t flag, unsigned long attrs);
58 void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size,
59 void *vaddr, dma_addr_t dma_addr,
62 void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain);
64 void vduse_domain_destroy(struct vduse_iova_domain *domain);
66 struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit,
69 int vduse_domain_init(void);
71 void vduse_domain_exit(void);
73 #endif /* _VDUSE_IOVA_DOMAIN_H */