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 <[email protected]>
   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 */