blob: e13d36ec57e71f47f3acbbbda0a710c28d14bb17 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2022 - Google LLC
* Author: David Brazdil <dbrazdil@google.com>
*/
#include <linux/kvm_host.h>
static unsigned long dev_to_id(struct device *dev)
{
/* Use the struct device pointer as a unique identifier. */
return (unsigned long)dev;
}
int pkvm_iommu_driver_init(enum pkvm_iommu_driver_id id, void *data, size_t size)
{
return kvm_call_hyp_nvhe(__pkvm_iommu_driver_init, id, data, size);
}
int pkvm_iommu_register(struct device *dev, enum pkvm_iommu_driver_id drv_id,
phys_addr_t pa, size_t size)
{
void *mem;
int ret;
/*
* Hypcall to register the device. It will return -ENOMEM if it needs
* more memory. In that case allocate a page and retry.
* We assume that hyp never allocates more than a page per hypcall.
*/
ret = kvm_call_hyp_nvhe(__pkvm_iommu_register, dev_to_id(dev),
drv_id, pa, size, NULL, 0);
if (ret == -ENOMEM) {
mem = (void *)__get_free_page(GFP_KERNEL);
if (!mem)
return -ENOMEM;
ret = kvm_call_hyp_nvhe(__pkvm_iommu_register, dev_to_id(dev),
drv_id, pa, size, mem, PAGE_SIZE);
}
return ret;
}
int pkvm_iommu_suspend(struct device *dev)
{
return kvm_call_hyp_nvhe(__pkvm_iommu_pm_notify, dev_to_id(dev),
PKVM_IOMMU_PM_SUSPEND);
}
EXPORT_SYMBOL_GPL(pkvm_iommu_suspend);
int pkvm_iommu_resume(struct device *dev)
{
return kvm_call_hyp_nvhe(__pkvm_iommu_pm_notify, dev_to_id(dev),
PKVM_IOMMU_PM_RESUME);
}
EXPORT_SYMBOL_GPL(pkvm_iommu_resume);