64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022 - Google LLC
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* Author: David Brazdil <dbrazdil@google.com>
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*/
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#include <linux/kvm_host.h>
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static unsigned long dev_to_id(struct device *dev)
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{
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/* Use the struct device pointer as a unique identifier. */
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return (unsigned long)dev;
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}
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int pkvm_iommu_driver_init(enum pkvm_iommu_driver_id id, void *data, size_t size)
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{
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return kvm_call_hyp_nvhe(__pkvm_iommu_driver_init, id, data, size);
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}
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int pkvm_iommu_register(struct device *dev, enum pkvm_iommu_driver_id drv_id,
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phys_addr_t pa, size_t size, struct device *parent)
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{
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void *mem;
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int ret;
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/*
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* Hypcall to register the device. It will return -ENOMEM if it needs
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* more memory. In that case allocate a page and retry.
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* We assume that hyp never allocates more than a page per hypcall.
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*/
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ret = kvm_call_hyp_nvhe(__pkvm_iommu_register, dev_to_id(dev),
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drv_id, pa, size, dev_to_id(parent), NULL, 0);
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if (ret == -ENOMEM) {
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mem = (void *)__get_free_page(GFP_KERNEL);
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if (!mem)
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return -ENOMEM;
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ret = kvm_call_hyp_nvhe(__pkvm_iommu_register, dev_to_id(dev),
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drv_id, pa, size, dev_to_id(parent),
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mem, PAGE_SIZE);
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}
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return ret;
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}
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int pkvm_iommu_suspend(struct device *dev)
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{
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return kvm_call_hyp_nvhe(__pkvm_iommu_pm_notify, dev_to_id(dev),
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PKVM_IOMMU_PM_SUSPEND);
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}
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EXPORT_SYMBOL_GPL(pkvm_iommu_suspend);
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int pkvm_iommu_resume(struct device *dev)
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{
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return kvm_call_hyp_nvhe(__pkvm_iommu_pm_notify, dev_to_id(dev),
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PKVM_IOMMU_PM_RESUME);
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}
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EXPORT_SYMBOL_GPL(pkvm_iommu_resume);
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int pkvm_iommu_finalize(void)
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{
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return kvm_call_hyp_nvhe(__pkvm_iommu_finalize);
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}
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EXPORT_SYMBOL_GPL(pkvm_iommu_finalize);
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