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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
*/
#include <linux/iommu.h>
#include "iommufd_private.h"
void iommufd_hw_pagetable_destroy(struct iommufd_object *obj)
{
struct iommufd_hw_pagetable *hwpt =
container_of(obj, struct iommufd_hw_pagetable, obj);
WARN_ON(!list_empty(&hwpt->devices));
iommu_domain_free(hwpt->domain);
refcount_dec(&hwpt->ioas->obj.users);
mutex_destroy(&hwpt->devices_lock);
}
/**
* iommufd_hw_pagetable_alloc() - Get an iommu_domain for a device
* @ictx: iommufd context
* @ioas: IOAS to associate the domain with
* @dev: Device to get an iommu_domain for
*
* Allocate a new iommu_domain and return it as a hw_pagetable.
*/
struct iommufd_hw_pagetable *
iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
struct device *dev)
{
struct iommufd_hw_pagetable *hwpt;
int rc;
hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE);
if (IS_ERR(hwpt))
return hwpt;
hwpt->domain = iommu_domain_alloc(dev->bus);
if (!hwpt->domain) {
rc = -ENOMEM;
goto out_abort;
}
INIT_LIST_HEAD(&hwpt->devices);
INIT_LIST_HEAD(&hwpt->hwpt_item);
mutex_init(&hwpt->devices_lock);
/* Pairs with iommufd_hw_pagetable_destroy() */
refcount_inc(&ioas->obj.users);
hwpt->ioas = ioas;
return hwpt;
out_abort:
iommufd_object_abort(ictx, &hwpt->obj);
return ERR_PTR(rc);
}
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