iova_domain.h (1963B)
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}; 38 39int vduse_domain_set_map(struct vduse_iova_domain *domain, 40 struct vhost_iotlb *iotlb); 41 42void vduse_domain_clear_map(struct vduse_iova_domain *domain, 43 struct vhost_iotlb *iotlb); 44 45dma_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, 48 unsigned long attrs); 49 50void 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); 53 54void *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); 57 58void vduse_domain_free_coherent(struct vduse_iova_domain *domain, size_t size, 59 void *vaddr, dma_addr_t dma_addr, 60 unsigned long attrs); 61 62void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain); 63 64void vduse_domain_destroy(struct vduse_iova_domain *domain); 65 66struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit, 67 size_t bounce_size); 68 69int vduse_domain_init(void); 70 71void vduse_domain_exit(void); 72 73#endif /* _VDUSE_IOVA_DOMAIN_H */