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 BOUNCE_MAP_SHIFT 12 21 #define BOUNCE_MAP_SIZE (1 << BOUNCE_MAP_SHIFT) 22 #define BOUNCE_MAP_MASK (~(BOUNCE_MAP_SIZE - 1)) 23 #define BOUNCE_MAP_ALIGN(addr) (((addr) + BOUNCE_MAP_SIZE - 1) & ~(BOUNCE_MAP_SIZE - 1)) 24 25 struct vduse_bounce_map { 26 struct page *bounce_page; 27 struct page *user_bounce_page; 28 u64 orig_phys; 29 }; 30 31 struct vduse_iova_domain { 32 struct iova_domain stream_iovad; 33 struct iova_domain consistent_iovad; 34 struct vduse_bounce_map *bounce_maps; 35 size_t bounce_size; 36 unsigned long iova_limit; 37 int bounce_map; 38 struct vhost_iotlb *iotlb; 39 spinlock_t iotlb_lock; 40 struct file *file; 41 bool user_bounce_pages; 42 rwlock_t bounce_lock; 43 }; 44 45 int vduse_domain_set_map(struct vduse_iova_domain *domain, 46 struct vhost_iotlb *iotlb); 47 48 void vduse_domain_clear_map(struct vduse_iova_domain *domain, 49 struct vhost_iotlb *iotlb); 50 51 void vduse_domain_sync_single_for_device(struct vduse_iova_domain *domain, 52 dma_addr_t dma_addr, size_t size, 53 enum dma_data_direction dir); 54 55 void vduse_domain_sync_single_for_cpu(struct vduse_iova_domain *domain, 56 dma_addr_t dma_addr, size_t size, 57 enum dma_data_direction dir); 58 59 dma_addr_t vduse_domain_map_page(struct vduse_iova_domain *domain, 60 struct page *page, unsigned long offset, 61 size_t size, enum dma_data_direction dir, 62 unsigned long attrs); 63 64 void vduse_domain_unmap_page(struct vduse_iova_domain *domain, 65 dma_addr_t dma_addr, size_t size, 66 enum dma_data_direction dir, unsigned long attrs); 67 68 void *vduse_domain_alloc_coherent(struct vduse_iova_domain *domain, 69 size_t size, dma_addr_t *dma_addr, 70 gfp_t flag); 71 72 void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, 73 void *vaddr, dma_addr_t dma_addr, 74 unsigned long attrs); 75 76 void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain); 77 78 int vduse_domain_add_user_bounce_pages(struct vduse_iova_domain *domain, 79 struct page **pages, int count); 80 81 void vduse_domain_remove_user_bounce_pages(struct vduse_iova_domain *domain); 82 83 void vduse_domain_destroy(struct vduse_iova_domain *domain); 84 85 struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit, 86 size_t bounce_size); 87 88 int vduse_domain_init(void); 89 90 void vduse_domain_exit(void); 91 92 #endif /* _VDUSE_IOVA_DOMAIN_H */ 93