1 /* 2 * Copyright (C) 2016 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include "msm_drv.h" 19 #include "msm_gem.h" 20 #include "msm_mmu.h" 21 22 static void 23 msm_gem_address_space_destroy(struct kref *kref) 24 { 25 struct msm_gem_address_space *aspace = container_of(kref, 26 struct msm_gem_address_space, kref); 27 28 drm_mm_takedown(&aspace->mm); 29 if (aspace->mmu) 30 aspace->mmu->funcs->destroy(aspace->mmu); 31 kfree(aspace); 32 } 33 34 35 void msm_gem_address_space_put(struct msm_gem_address_space *aspace) 36 { 37 if (aspace) 38 kref_put(&aspace->kref, msm_gem_address_space_destroy); 39 } 40 41 /* Actually unmap memory for the vma */ 42 void msm_gem_purge_vma(struct msm_gem_address_space *aspace, 43 struct msm_gem_vma *vma) 44 { 45 unsigned size = vma->node.size << PAGE_SHIFT; 46 47 /* Print a message if we try to purge a vma in use */ 48 if (WARN_ON(vma->inuse > 0)) 49 return; 50 51 /* Don't do anything if the memory isn't mapped */ 52 if (!vma->mapped) 53 return; 54 55 if (aspace->mmu) 56 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, size); 57 58 vma->mapped = false; 59 } 60 61 /* Remove reference counts for the mapping */ 62 void msm_gem_unmap_vma(struct msm_gem_address_space *aspace, 63 struct msm_gem_vma *vma) 64 { 65 if (!WARN_ON(!vma->iova)) 66 vma->inuse--; 67 } 68 69 int 70 msm_gem_map_vma(struct msm_gem_address_space *aspace, 71 struct msm_gem_vma *vma, struct sg_table *sgt, int npages) 72 { 73 unsigned size = npages << PAGE_SHIFT; 74 int ret = 0; 75 76 if (WARN_ON(!vma->iova)) 77 return -EINVAL; 78 79 /* Increase the usage counter */ 80 vma->inuse++; 81 82 if (vma->mapped) 83 return 0; 84 85 vma->mapped = true; 86 87 if (aspace->mmu) 88 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, 89 size, IOMMU_READ | IOMMU_WRITE); 90 91 if (ret) 92 vma->mapped = false; 93 94 return ret; 95 } 96 97 /* Close an iova. Warn if it is still in use */ 98 void msm_gem_close_vma(struct msm_gem_address_space *aspace, 99 struct msm_gem_vma *vma) 100 { 101 if (WARN_ON(vma->inuse > 0 || vma->mapped)) 102 return; 103 104 spin_lock(&aspace->lock); 105 if (vma->iova) 106 drm_mm_remove_node(&vma->node); 107 spin_unlock(&aspace->lock); 108 109 vma->iova = 0; 110 111 msm_gem_address_space_put(aspace); 112 } 113 114 /* Initialize a new vma and allocate an iova for it */ 115 int msm_gem_init_vma(struct msm_gem_address_space *aspace, 116 struct msm_gem_vma *vma, int npages) 117 { 118 int ret; 119 120 if (WARN_ON(vma->iova)) 121 return -EBUSY; 122 123 spin_lock(&aspace->lock); 124 ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages); 125 spin_unlock(&aspace->lock); 126 127 if (ret) 128 return ret; 129 130 vma->iova = vma->node.start << PAGE_SHIFT; 131 vma->mapped = false; 132 133 kref_get(&aspace->kref); 134 135 return 0; 136 } 137 138 139 struct msm_gem_address_space * 140 msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain, 141 const char *name) 142 { 143 struct msm_gem_address_space *aspace; 144 u64 size = domain->geometry.aperture_end - 145 domain->geometry.aperture_start; 146 147 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL); 148 if (!aspace) 149 return ERR_PTR(-ENOMEM); 150 151 spin_lock_init(&aspace->lock); 152 aspace->name = name; 153 aspace->mmu = msm_iommu_new(dev, domain); 154 155 drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT), 156 size >> PAGE_SHIFT); 157 158 kref_init(&aspace->kref); 159 160 return aspace; 161 } 162