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 22 struct vduse_bounce_map { 23 struct page *bounce_page; 24 u64 orig_phys; 25 }; 26 27 struct 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 41 int vduse_domain_set_map(struct vduse_iova_domain *domain, 42 struct vhost_iotlb *iotlb); 43 44 void vduse_domain_clear_map(struct vduse_iova_domain *domain, 45 struct vhost_iotlb *iotlb); 46 47 dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain, 48 struct page *page, unsigned long offset, 49 size_t size, enum dma_data_direction dir, 50 unsigned long attrs); 51 52 void vduse_domain_unmap_page(struct vduse_iova_domain *domain, 53 dma_addr_t dma_addr, size_t size, 54 enum dma_data_direction dir, unsigned long attrs); 55 56 void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, 57 size_t size, dma_addr_t *dma_addr, 58 gfp_t flag, unsigned long attrs); 59 60 void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, 61 void *vaddr, dma_addr_t dma_addr, 62 unsigned long attrs); 63 64 void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain); 65 66 int vduse_domain_add_user_bounce_pages(struct vduse_iova_domain *domain, 67 struct page **pages, int count); 68 69 void vduse_domain_remove_user_bounce_pages(struct vduse_iova_domain *domain); 70 71 void vduse_domain_destroy(struct vduse_iova_domain *domain); 72 73 struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit, 74 size_t bounce_size); 75 76 int vduse_domain_init(void); 77 78 void vduse_domain_exit(void); 79 80 #endif /* _VDUSE_IOVA_DOMAIN_H */ 81