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 void 42 msm_gem_unmap_vma(struct msm_gem_address_space *aspace, 43 struct msm_gem_vma *vma, struct sg_table *sgt) 44 { 45 if (!vma->iova) 46 return; 47 48 if (aspace->mmu) { 49 unsigned size = vma->node.size << PAGE_SHIFT; 50 aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size); 51 } 52 53 drm_mm_remove_node(&vma->node); 54 55 vma->iova = 0; 56 57 msm_gem_address_space_put(aspace); 58 } 59 60 int 61 msm_gem_map_vma(struct msm_gem_address_space *aspace, 62 struct msm_gem_vma *vma, struct sg_table *sgt, int npages) 63 { 64 int ret; 65 66 if (WARN_ON(drm_mm_node_allocated(&vma->node))) 67 return 0; 68 69 ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages); 70 if (ret) 71 return ret; 72 73 vma->iova = vma->node.start << PAGE_SHIFT; 74 75 if (aspace->mmu) { 76 unsigned size = npages << PAGE_SHIFT; 77 ret = aspace->mmu->funcs->map(aspace->mmu, vma->iova, sgt, 78 size, IOMMU_READ | IOMMU_WRITE); 79 } 80 81 /* Get a reference to the aspace to keep it around */ 82 kref_get(&aspace->kref); 83 84 return ret; 85 } 86 87 struct msm_gem_address_space * 88 msm_gem_address_space_create(struct device *dev, struct iommu_domain *domain, 89 const char *name) 90 { 91 struct msm_gem_address_space *aspace; 92 93 aspace = kzalloc(sizeof(*aspace), GFP_KERNEL); 94 if (!aspace) 95 return ERR_PTR(-ENOMEM); 96 97 aspace->name = name; 98 aspace->mmu = msm_iommu_new(dev, domain); 99 100 drm_mm_init(&aspace->mm, (domain->geometry.aperture_start >> PAGE_SHIFT), 101 (domain->geometry.aperture_end >> PAGE_SHIFT) - 1); 102 103 kref_init(&aspace->kref); 104 105 return aspace; 106 } 107