115 lines
3 KiB
C
115 lines
3 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "msm_drv.h"
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#include "msm_mmu.h"
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struct msm_iommu {
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struct msm_mmu base;
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struct iommu_domain *domain;
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};
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#define to_msm_iommu(x) container_of(x, struct msm_iommu, base)
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static int msm_fault_handler(struct iommu_domain *domain, struct device *dev,
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unsigned long iova, int flags, void *arg)
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{
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struct msm_iommu *iommu = arg;
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if (iommu->base.handler)
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return iommu->base.handler(iommu->base.arg, iova, flags);
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pr_warn_ratelimited("*** fault: iova=%08lx, flags=%d\n", iova, flags);
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return 0;
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}
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static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names,
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int cnt)
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{
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struct msm_iommu *iommu = to_msm_iommu(mmu);
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int ret;
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pm_runtime_get_sync(mmu->dev);
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ret = iommu_attach_device(iommu->domain, mmu->dev);
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pm_runtime_put_sync(mmu->dev);
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return ret;
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}
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static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
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int cnt)
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{
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struct msm_iommu *iommu = to_msm_iommu(mmu);
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pm_runtime_get_sync(mmu->dev);
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iommu_detach_device(iommu->domain, mmu->dev);
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pm_runtime_put_sync(mmu->dev);
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}
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static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
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struct sg_table *sgt, unsigned len, int prot)
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{
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struct msm_iommu *iommu = to_msm_iommu(mmu);
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size_t ret;
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// pm_runtime_get_sync(mmu->dev);
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ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
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// pm_runtime_put_sync(mmu->dev);
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WARN_ON(!ret);
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return (ret == len) ? 0 : -EINVAL;
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}
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static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
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struct sg_table *sgt, unsigned len)
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{
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struct msm_iommu *iommu = to_msm_iommu(mmu);
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pm_runtime_get_sync(mmu->dev);
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iommu_unmap(iommu->domain, iova, len);
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pm_runtime_put_sync(mmu->dev);
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return 0;
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}
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static void msm_iommu_destroy(struct msm_mmu *mmu)
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{
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struct msm_iommu *iommu = to_msm_iommu(mmu);
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iommu_domain_free(iommu->domain);
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kfree(iommu);
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}
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static const struct msm_mmu_funcs funcs = {
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.attach = msm_iommu_attach,
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.detach = msm_iommu_detach,
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.map = msm_iommu_map,
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.unmap = msm_iommu_unmap,
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.destroy = msm_iommu_destroy,
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};
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struct msm_mmu *msm_iommu_new(struct device *dev, struct iommu_domain *domain)
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{
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struct msm_iommu *iommu;
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iommu = kzalloc(sizeof(*iommu), GFP_KERNEL);
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if (!iommu)
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return ERR_PTR(-ENOMEM);
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iommu->domain = domain;
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msm_mmu_init(&iommu->base, dev, &funcs);
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iommu_set_fault_handler(domain, msm_fault_handler, iommu);
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return &iommu->base;
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}
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