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 *domain, struct device *dev, 28 unsigned long iova, int flags, void *arg) 29 { 30 struct msm_iommu *iommu = arg; 31 if (iommu->base.handler) 32 return iommu->base.handler(iommu->base.arg, iova, flags); 33 pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags); 34 return 0; 35 } 36 37 static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names, 38 int cnt) 39 { 40 struct msm_iommu *iommu = to_msm_iommu(mmu); 41 42 return iommu_attach_device(iommu->domain, mmu->dev); 43 } 44 45 static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names, 46 int cnt) 47 { 48 struct msm_iommu *iommu = to_msm_iommu(mmu); 49 50 iommu_detach_device(iommu->domain, mmu->dev); 51 } 52 53 static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova, 54 struct sg_table *sgt, unsigned len, int prot) 55 { 56 struct msm_iommu *iommu = to_msm_iommu(mmu); 57 size_t ret; 58 59 ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot); 60 WARN_ON(!ret); 61 62 return (ret == len) ? 0 : -EINVAL; 63 } 64 65 static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova, unsigned len) 66 { 67 struct msm_iommu *iommu = to_msm_iommu(mmu); 68 69 iommu_unmap(iommu->domain, iova, len); 70 71 return 0; 72 } 73 74 static void msm_iommu_destroy(struct msm_mmu *mmu) 75 { 76 struct msm_iommu *iommu = to_msm_iommu(mmu); 77 iommu_domain_free(iommu->domain); 78 kfree(iommu); 79 } 80 81 static const struct msm_mmu_funcs funcs = { 82 .attach = msm_iommu_attach, 83 .detach = msm_iommu_detach, 84 .map = msm_iommu_map, 85 .unmap = msm_iommu_unmap, 86 .destroy = msm_iommu_destroy, 87 }; 88 89 struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain) 90 { 91 struct msm_iommu *iommu; 92 93 iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); 94 if (!iommu) 95 return ERR_PTR(-ENOMEM); 96 97 iommu->domain = domain; 98 msm_mmu_init(&iommu->base, dev, &funcs); 99 iommu_set_fault_handler(domain, msm_fault_handler, iommu); 100 101 return &iommu->base; 102 } 103