LXR linux/drivers/vdpa/vdpa_user/iova

   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 */
  74