1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2016 Red Hat 4 * Author: Rob Clark <robdclark@gmail.com> 5 */ 6 7 #include "msm_drv.h" 8 #include "msm_fence.h" 9 #include "msm_gem.h" 10 #include "msm_mmu.h" 11 12 static void 13 msm_gem_address_space_destroy(struct kref *kref) 14 { 15 struct msm_gem_address_space *aspace = container_of(kref, 16 struct msm_gem_address_space, kref); 17 18 drm_mm_takedown(&aspace->mm); 19 if (aspace->mmu) 20 aspace->mmu->funcs->destroy(aspace->mmu); 21 put_pid(aspace->pid); 22 kfree(aspace); 23 } 24 25 26 void msm_gem_address_space_put(struct msm_gem_address_space *aspace) 27 { 28 if (aspace) 29 kref_put(&aspace->kref, msm_gem_address_space_destroy); 30 } 31 32 struct msm_gem_address_space * 33 msm_gem_address_space_get(struct msm_gem_address_space *aspace) 34 { 35 if (!IS_ERR_OR_NULL(aspace)) 36 kref_get(&aspace->kref); 37 38 return aspace; 39 } 40 41 bool msm_gem_vma_inuse(struct msm_gem_vma *vma) 42 { 43 if (vma->inuse > 0) 44 return true; 45 46 while (vma->fence_mask) { 47 unsigned idx = ffs(vma->fence_mask) - 1; 48 49 if (!msm_fence_completed(vma->fctx[idx], vma->fence[idx])) 50 return true; 51 52 vma->fence_mask &= ~BIT(idx); 53 } 54 55 return false; 56 } 57 58 /* Actually unmap memory for the vma */ 59 void msm_gem_purge_vma(struct msm_gem_address_space *aspace, 60 struct msm_gem_vma *vma) 61 { 62 unsigned size = vma->node.size; 63 64 /* Print a message if we try to purge a vma in use */ 65 GEM_WARN_ON(msm_gem_vma_inuse(vma)); 66 67 /* Don't do anything if the memory isn't mapped */ 68 if (!vma->mapped) 69 return; 70 71 if (aspace->mmu) 72 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size); 73 74 vma->mapped = false; 75 } 76 77 /* Remove reference counts for the mapping */ 78 void msm_gem_unpin_vma(struct msm_gem_vma *vma) 79 { 80 if (GEM_WARN_ON(!vma->inuse)) 81 return; 82 if (!GEM_WARN_ON(!vma->iova)) 83 vma->inuse--; 84 } 85 86 /* Replace pin reference with fence: */ 87 void msm_gem_unpin_vma_fenced(struct msm_gem_vma *vma, struct msm_fence_context *fctx) 88 { 89 vma->fctx[fctx->index] = fctx; 90 vma->fence[fctx->index] = fctx->last_fence; 91 vma->fence_mask |= BIT(fctx->index); 92 msm_gem_unpin_vma(vma); 93 } 94 95 /* Map and pin vma: */ 96 int 97 msm_gem_map_vma(struct msm_gem_address_space *aspace, 98 struct msm_gem_vma *vma, int prot, 99 struct sg_table *sgt, int size) 100 { 101 int ret = 0; 102 103 if (GEM_WARN_ON(!vma->iova)) 104 return -EINVAL; 105 106 /* Increase the usage counter */ 107 vma->inuse++; 108 109 if (vma->mapped) 110 return 0; 111 112 vma->mapped = true; 113 114 if (aspace && aspace->mmu) 115 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, 116 size, prot); 117 118 if (ret) { 119 vma->mapped = false; 120 vma->inuse--; 121 } 122 123 return ret; 124 } 125 126 /* Close an iova. Warn if it is still in use */ 127 void msm_gem_close_vma(struct msm_gem_address_space *aspace, 128 struct msm_gem_vma *vma) 129 { 130 GEM_WARN_ON(msm_gem_vma_inuse(vma) || vma->mapped); 131 132 spin_lock(&aspace->lock); 133 if (vma->iova) 134 drm_mm_remove_node(&vma->node); 135 spin_unlock(&aspace->lock); 136 137 vma->iova = 0; 138 139 msm_gem_address_space_put(aspace); 140 } 141 142 /* Initialize a new vma and allocate an iova for it */ 143 int msm_gem_init_vma(struct msm_gem_address_space *aspace, 144 struct msm_gem_vma *vma, int size, 145 u64 range_start, u64 range_end) 146 { 147 int ret; 148 149 if (GEM_WARN_ON(vma->iova)) 150 return -EBUSY; 151 152 spin_lock(&aspace->lock); 153 ret = drm_mm_insert_node_in_range(&aspace->mm, &vma->node, 154 size, PAGE_SIZE, 0, 155 range_start, range_end, 0); 156 spin_unlock(&aspace->lock); 157 158 if (ret) 159 return ret; 160 161 vma->iova = vma->node.start; 162 vma->mapped = false; 163 164 kref_get(&aspace->kref); 165 166 return 0; 167 } 168 169 struct msm_gem_address_space * 170 msm_gem_address_space_create(struct msm_mmu *mmu, const char *name, 171 u64 va_start, u64 size) 172 { 173 struct msm_gem_address_space *aspace; 174 175 if (IS_ERR(mmu)) 176 return ERR_CAST(mmu); 177 178 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL); 179 if (!aspace) 180 return ERR_PTR(-ENOMEM); 181 182 spin_lock_init(&aspace->lock); 183 aspace->name = name; 184 aspace->mmu = mmu; 185 aspace->va_start = va_start; 186 aspace->va_size = size; 187 188 drm_mm_init(&aspace->mm, va_start, size); 189 190 kref_init(&aspace->kref); 191 192 return aspace; 193 } 194