1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * MMU-based software IOTLB.
4 *
5 * Copyright (C) 2020-2021 Bytedance Inc. and/or its affiliates. All rights reserved.
6 *
7 * Author: Xie Yongji <xieyongji@bytedance.com>
8 *
9 */
10
11#ifndef _VDUSE_IOVA_DOMAIN_H
12#define _VDUSE_IOVA_DOMAIN_H
13
14#include <linux/iova.h>
15#include <linux/dma-mapping.h>
16#include <linux/vhost_iotlb.h>
17
18#define IOVA_START_PFN 1
19
20#define INVALID_PHYS_ADDR (~(phys_addr_t)0)
21
22struct vduse_bounce_map {
23 struct page *bounce_page;
24 u64 orig_phys;
25};
26
27struct vduse_iova_domain {
28 struct iova_domain stream_iovad;
29 struct iova_domain consistent_iovad;
30 struct vduse_bounce_map *bounce_maps;
31 size_t bounce_size;
32 unsigned long iova_limit;
33 int bounce_map;
34 struct vhost_iotlb *iotlb;
35 spinlock_t iotlb_lock;
36 struct file *file;
37 bool user_bounce_pages;
38 rwlock_t bounce_lock;
39};
40
41int vduse_domain_set_map(struct vduse_iova_domain *domain,
42 struct vhost_iotlb *iotlb);
43
44void vduse_domain_clear_map(struct vduse_iova_domain *domain,
45 struct vhost_iotlb *iotlb);
46
47void vduse_domain_sync_single_for_device(struct vduse_iova_domain *domain,
48 dma_addr_t dma_addr, size_t size,
49 enum dma_data_direction dir);
50
51void vduse_domain_sync_single_for_cpu(struct vduse_iova_domain *domain,
52 dma_addr_t dma_addr, size_t size,
53 enum dma_data_direction dir);
54
55dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain,
56 struct page *page, unsigned long offset,
57 size_t size, enum dma_data_direction dir,
58 unsigned long attrs);
59
60void vduse_domain_unmap_page(struct vduse_iova_domain *domain,
61 dma_addr_t dma_addr, size_t size,
62 enum dma_data_direction dir, unsigned long attrs);
63
64void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain,
65 size_t size, dma_addr_t *dma_addr,
66 gfp_t flag, unsigned long attrs);
67
68void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size,
69 void *vaddr, dma_addr_t dma_addr,
70 unsigned long attrs);
71
72void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain);
73
74int vduse_domain_add_user_bounce_pages(struct vduse_iova_domain *domain,
75 struct page **pages, int count);
76
77void vduse_domain_remove_user_bounce_pages(struct vduse_iova_domain *domain);
78
79void vduse_domain_destroy(struct vduse_iova_domain *domain);
80
81struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit,
82 size_t bounce_size);
83
84int vduse_domain_init(void);
85
86void vduse_domain_exit(void);
87
88#endif /* _VDUSE_IOVA_DOMAIN_H */
89

source code of linux/drivers/vdpa/vdpa_user/iova_domain.h