1 /* 2 * Copyright (C) 2013 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_mmu.h" 20 21 struct msm_iommu { 22 struct msm_mmu base; 23 struct iommu_domain *domain; 24 }; 25 #define to_msm_iommu(x) container_of(x, struct msm_iommu, base) 26 27 static int msm_fault_handler(struct iommu_domain *iommu, struct device *dev, 28 unsigned long iova, int flags, void *arg) 29 { 30 DBG("*** fault: iova=%08lx, flags=%d", iova, flags); 31 return 0; 32 } 33 34 static int msm_iommu_attach(struct msm_mmu *mmu, const char **names, int cnt) 35 { 36 struct drm_device *dev = mmu->dev; 37 struct msm_iommu *iommu = to_msm_iommu(mmu); 38 int i, ret; 39 40 for (i = 0; i < cnt; i++) { 41 struct device *msm_iommu_get_ctx(const char *ctx_name); 42 struct device *ctx = msm_iommu_get_ctx(names[i]); 43 if (IS_ERR_OR_NULL(ctx)) 44 continue; 45 ret = iommu_attach_device(iommu->domain, ctx); 46 if (ret) { 47 dev_warn(dev->dev, "could not attach iommu to %s", names[i]); 48 return ret; 49 } 50 } 51 52 return 0; 53 } 54 55 static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova, 56 struct sg_table *sgt, unsigned len, int prot) 57 { 58 struct msm_iommu *iommu = to_msm_iommu(mmu); 59 struct iommu_domain *domain = iommu->domain; 60 struct scatterlist *sg; 61 unsigned int da = iova; 62 unsigned int i, j; 63 int ret; 64 65 if (!domain || !sgt) 66 return -EINVAL; 67 68 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 69 u32 pa = sg_phys(sg) - sg->offset; 70 size_t bytes = sg->length + sg->offset; 71 72 VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes); 73 74 ret = iommu_map(domain, da, pa, bytes, prot); 75 if (ret) 76 goto fail; 77 78 da += bytes; 79 } 80 81 return 0; 82 83 fail: 84 da = iova; 85 86 for_each_sg(sgt->sgl, sg, i, j) { 87 size_t bytes = sg->length + sg->offset; 88 iommu_unmap(domain, da, bytes); 89 da += bytes; 90 } 91 return ret; 92 } 93 94 static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova, 95 struct sg_table *sgt, unsigned len) 96 { 97 struct msm_iommu *iommu = to_msm_iommu(mmu); 98 struct iommu_domain *domain = iommu->domain; 99 struct scatterlist *sg; 100 unsigned int da = iova; 101 int i; 102 103 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 104 size_t bytes = sg->length + sg->offset; 105 size_t unmapped; 106 107 unmapped = iommu_unmap(domain, da, bytes); 108 if (unmapped < bytes) 109 return unmapped; 110 111 VERB("unmap[%d]: %08x(%x)", i, iova, bytes); 112 113 BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); 114 115 da += bytes; 116 } 117 118 return 0; 119 } 120 121 static void msm_iommu_destroy(struct msm_mmu *mmu) 122 { 123 struct msm_iommu *iommu = to_msm_iommu(mmu); 124 iommu_domain_free(iommu->domain); 125 kfree(iommu); 126 } 127 128 static const struct msm_mmu_funcs funcs = { 129 .attach = msm_iommu_attach, 130 .map = msm_iommu_map, 131 .unmap = msm_iommu_unmap, 132 .destroy = msm_iommu_destroy, 133 }; 134 135 struct msm_mmu *msm_iommu_new(struct drm_device *dev, struct iommu_domain *domain) 136 { 137 struct msm_iommu *iommu; 138 139 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); 140 if (!iommu) 141 return ERR_PTR(-ENOMEM); 142 143 iommu->domain = domain; 144 msm_mmu_init(&iommu->base, dev, &funcs); 145 iommu_set_fault_handler(domain, msm_fault_handler, dev); 146 147 return &iommu->base; 148 } 149