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 pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", 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 msm_iommu *iommu = to_msm_iommu(mmu); 37 return iommu_attach_device(iommu->domain, mmu->dev); 38 } 39 40 static void msm_iommu_detach(struct msm_mmu *mmu, const char **names, int cnt) 41 { 42 struct msm_iommu *iommu = to_msm_iommu(mmu); 43 iommu_detach_device(iommu->domain, mmu->dev); 44 } 45 46 static int msm_iommu_map(struct msm_mmu *mmu, uint32_t iova, 47 struct sg_table *sgt, unsigned len, int prot) 48 { 49 struct msm_iommu *iommu = to_msm_iommu(mmu); 50 struct iommu_domain *domain = iommu->domain; 51 struct scatterlist *sg; 52 unsigned int da = iova; 53 unsigned int i, j; 54 int ret; 55 56 if (!domain || !sgt) 57 return -EINVAL; 58 59 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 60 u32 pa = sg_phys(sg) - sg->offset; 61 size_t bytes = sg->length + sg->offset; 62 63 VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes); 64 65 ret = iommu_map(domain, da, pa, bytes, prot); 66 if (ret) 67 goto fail; 68 69 da += bytes; 70 } 71 72 return 0; 73 74 fail: 75 da = iova; 76 77 for_each_sg(sgt->sgl, sg, i, j) { 78 size_t bytes = sg->length + sg->offset; 79 iommu_unmap(domain, da, bytes); 80 da += bytes; 81 } 82 return ret; 83 } 84 85 static int msm_iommu_unmap(struct msm_mmu *mmu, uint32_t iova, 86 struct sg_table *sgt, unsigned len) 87 { 88 struct msm_iommu *iommu = to_msm_iommu(mmu); 89 struct iommu_domain *domain = iommu->domain; 90 struct scatterlist *sg; 91 unsigned int da = iova; 92 int i; 93 94 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 95 size_t bytes = sg->length + sg->offset; 96 size_t unmapped; 97 98 unmapped = iommu_unmap(domain, da, bytes); 99 if (unmapped < bytes) 100 return unmapped; 101 102 VERB("unmap[%d]: %08x(%x)", i, iova, bytes); 103 104 BUG_ON(!PAGE_ALIGNED(bytes)); 105 106 da += bytes; 107 } 108 109 return 0; 110 } 111 112 static void msm_iommu_destroy(struct msm_mmu *mmu) 113 { 114 struct msm_iommu *iommu = to_msm_iommu(mmu); 115 iommu_domain_free(iommu->domain); 116 kfree(iommu); 117 } 118 119 static const struct msm_mmu_funcs funcs = { 120 .attach = msm_iommu_attach, 121 .detach = msm_iommu_detach, 122 .map = msm_iommu_map, 123 .unmap = msm_iommu_unmap, 124 .destroy = msm_iommu_destroy, 125 }; 126 127 struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain) 128 { 129 struct msm_iommu *iommu; 130 131 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); 132 if (!iommu) 133 return ERR_PTR(-ENOMEM); 134 135 iommu->domain = domain; 136 msm_mmu_init(&iommu->base, dev, &funcs); 137 iommu_set_fault_handler(domain, msm_fault_handler, dev); 138 139 return &iommu->base; 140 } 141