drivers/vdpa/vdpa_user/iova_domain.h

   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 };
  38
  39 int vduse_domain_set_map(struct vduse_iova_domain *domain,
  40                          struct vhost_iotlb *iotlb);
  41
  42 void vduse_domain_clear_map(struct vduse_iova_domain *domain,
  43                             struct vhost_iotlb *iotlb);
  44
  45 dma_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
  50 void 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
  54 void *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
  58 void 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
  62 void vduse_domain_reset_bounce_map(struct vduse_iova_domain *domain);
  63
  64 void vduse_domain_destroy(struct vduse_iova_domain *domain);
  65
  66 struct vduse_iova_domain *vduse_domain_create(unsigned long iova_limit,
  67                                               size_t bounce_size);
  68
  69 int vduse_domain_init(void);
  70
  71 void vduse_domain_exit(void);
  72
  73 #endif /* _VDUSE_IOVA_DOMAIN_H */