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_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 } 153