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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;
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);
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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