drivers/gpu/drm/msm/msm_gem_vma.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2016 Red Hat
   4  * Author: Rob Clark <[email protected]>
   5  */
   6
   7 #include "msm_drv.h"
   8 #include "msm_gem.h"
   9 #include "msm_mmu.h"
  10
  11 static void
  12 msm_gem_address_space_destroy(struct kref *kref)
  13 {
  14         struct msm_gem_address_space *aspace = container_of(kref,
  15                         struct msm_gem_address_space, kref);
  16
  17         drm_mm_takedown(&aspace->mm);
  18         if (aspace->mmu)
  19                 aspace->mmu->funcs->destroy(aspace->mmu);
  20         kfree(aspace);
  21 }
  22
  23
  24 void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
  25 {
  26         if (aspace)
  27                 kref_put(&aspace->kref, msm_gem_address_space_destroy);
  28 }
  29
  30 /* Actually unmap memory for the vma */
  31 void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
  32                 struct msm_gem_vma *vma)
  33 {
  34         unsigned size = vma->node.size << PAGE_SHIFT;
  35
  36         /* Print a message if we try to purge a vma in use */
  37         if (WARN_ON(vma->inuse > 0))
  38                 return;
  39
  40         /* Don't do anything if the memory isn't mapped */
  41         if (!vma->mapped)
  42                 return;
  43
  44         if (aspace->mmu)
  45                 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size);
  46
  47         vma->mapped = false;
  48 }
  49
  50 /* Remove reference counts for the mapping */
  51 void msm_gem_unmap_vma(struct msm_gem_address_space *aspace,
  52                 struct msm_gem_vma *vma)
  53 {
  54         if (!WARN_ON(!vma->iova))
  55                 vma->inuse--;
  56 }
  57
  58 int
  59 msm_gem_map_vma(struct msm_gem_address_space *aspace,
  60                 struct msm_gem_vma *vma, int prot,
  61                 struct sg_table *sgt, int npages)
  62 {
  63         unsigned size = npages << PAGE_SHIFT;
  64         int ret = 0;
  65
  66         if (WARN_ON(!vma->iova))
  67                 return -EINVAL;
  68
  69         /* Increase the usage counter */
  70         vma->inuse++;
  71
  72         if (vma->mapped)
  73                 return 0;
  74
  75         vma->mapped = true;
  76
  77         if (aspace && aspace->mmu)
  78                 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt,
  79                                 size, prot);
  80
  81         if (ret)
  82                 vma->mapped = false;
  83
  84         return ret;
  85 }
  86
  87 /* Close an iova.  Warn if it is still in use */
  88 void msm_gem_close_vma(struct msm_gem_address_space *aspace,
  89                 struct msm_gem_vma *vma)
  90 {
  91         if (WARN_ON(vma->inuse > 0 || vma->mapped))
  92                 return;
  93
  94         spin_lock(&aspace->lock);
  95         if (vma->iova)
  96                 drm_mm_remove_node(&vma->node);
  97         spin_unlock(&aspace->lock);
  98
  99         vma->iova = 0;
 100
 101         msm_gem_address_space_put(aspace);
 102 }
 103
 104 /* Initialize a new vma and allocate an iova for it */
 105 int msm_gem_init_vma(struct msm_gem_address_space *aspace,
 106                 struct msm_gem_vma *vma, int npages,
 107                 u64 range_start, u64 range_end)
 108 {
 109         int ret;
 110
 111         if (WARN_ON(vma->iova))
 112                 return -EBUSY;
 113
 114         spin_lock(&aspace->lock);
 115         ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node, npages, 0,
 116                 0, range_start, range_end, 0);
 117         spin_unlock(&aspace->lock);
 118
 119         if (ret)
 120                 return ret;
 121
 122         vma->iova = vma->node.start << PAGE_SHIFT;
 123         vma->mapped = false;
 124
 125         kref_get(&aspace->kref);
 126
 127         return 0;
 128 }
 129
 130 struct msm_gem_address_space *
 131 msm_gem_address_space_create(struct msm_mmu *mmu, const char *name,
 132                 u64 va_start, u64 size)
 133 {
 134         struct msm_gem_address_space *aspace;
 135
 136         if (IS_ERR(mmu))
 137                 return ERR_CAST(mmu);
 138
 139         aspace = kzalloc(sizeof(*aspace), GFP_KERNEL);
 140         if (!aspace)
 141                 return ERR_PTR(-ENOMEM);
 142
 143         spin_lock_init(&aspace->lock);
 144         aspace->name = name;
 145         aspace->mmu = mmu;
 146
 147         drm_mm_init(&aspace->mm, va_start >> PAGE_SHIFT, size >> PAGE_SHIFT);
 148
 149         kref_init(&aspace->kref);
 150
 151         return aspace;
 152 }