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// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2013 Red Hat * Author: Rob Clark <robdclark@gmail.com> */ #include "msm_drv.h" #include "msm_mmu.h" struct msm_iommu { struct msm_mmu base; struct iommu_domain *domain; }; #define to_msm_iommu(x) container_of(x, struct msm_iommu, base) static int msm_fault_handler(struct iommu_domain *domain, struct device *dev, unsigned long iova, int flags, void *arg) { struct msm_iommu *iommu = arg; if (iommu->base.handler) return iommu->base.handler(iommu->base.arg, iova, flags); pr_warn_ratelimited("*** fault: iova=%16lx, flags=%d\n", iova, flags); return 0; } static void msm_iommu_detach(struct msm_mmu *mmu) { struct msm_iommu *iommu = to_msm_iommu(mmu); iommu_detach_device(iommu->domain, mmu->dev); } static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova, struct sg_table *sgt, size_t len, int prot) { struct msm_iommu *iommu = to_msm_iommu(mmu); size_t ret; /* The arm-smmu driver expects the addresses to be sign extended */ if (iova & BIT_ULL(48)) iova |= GENMASK_ULL(63, 49); ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot); WARN_ON(!ret); return (ret == len) ? 0 : -EINVAL; } static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova, size_t len) { struct msm_iommu *iommu = to_msm_iommu(mmu); if (iova & BIT_ULL(48)) iova |= GENMASK_ULL(63, 49); iommu_unmap(iommu->domain, iova, len); return 0; } static void msm_iommu_destroy(struct msm_mmu *mmu) { struct msm_iommu *iommu = to_msm_iommu(mmu); iommu_domain_free(iommu->domain); kfree(iommu); } static const struct msm_mmu_funcs funcs = { .detach = msm_iommu_detach, .map = msm_iommu_map, .unmap = msm_iommu_unmap, .destroy = msm_iommu_destroy, }; struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain) { struct msm_iommu *iommu; int ret; if (!domain) return ERR_PTR(-ENODEV); iommu = kzalloc(sizeof(*iommu), GFP_KERNEL); if (!iommu) return ERR_PTR(-ENOMEM); iommu->domain = domain; msm_mmu_init(&iommu->base, dev, &funcs); iommu_set_fault_handler(domain, msm_fault_handler, iommu); ret = iommu_attach_device(iommu->domain, dev); if (ret) { kfree(iommu); return ERR_PTR(ret); } return &iommu->base; }
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