106 lines
2.8 KiB
C
106 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*/
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#include <linux/iommu.h>
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#include "iommufd_private.h"
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void iommufd_hw_pagetable_destroy(struct iommufd_object *obj)
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{
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struct iommufd_hw_pagetable *hwpt =
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container_of(obj, struct iommufd_hw_pagetable, obj);
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WARN_ON(!list_empty(&hwpt->devices));
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if (!list_empty(&hwpt->hwpt_item)) {
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mutex_lock(&hwpt->ioas->mutex);
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list_del(&hwpt->hwpt_item);
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mutex_unlock(&hwpt->ioas->mutex);
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iopt_table_remove_domain(&hwpt->ioas->iopt, hwpt->domain);
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}
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if (hwpt->domain)
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iommu_domain_free(hwpt->domain);
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refcount_dec(&hwpt->ioas->obj.users);
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mutex_destroy(&hwpt->devices_lock);
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}
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/**
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* iommufd_hw_pagetable_alloc() - Get an iommu_domain for a device
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* @ictx: iommufd context
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* @ioas: IOAS to associate the domain with
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* @idev: Device to get an iommu_domain for
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* @immediate_attach: True if idev should be attached to the hwpt
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*
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* Allocate a new iommu_domain and return it as a hw_pagetable. The HWPT
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* will be linked to the given ioas and upon return the underlying iommu_domain
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* is fully popoulated.
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*/
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struct iommufd_hw_pagetable *
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iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, struct iommufd_ioas *ioas,
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struct iommufd_device *idev, bool immediate_attach)
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{
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struct iommufd_hw_pagetable *hwpt;
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int rc;
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lockdep_assert_held(&ioas->mutex);
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hwpt = iommufd_object_alloc(ictx, hwpt, IOMMUFD_OBJ_HW_PAGETABLE);
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if (IS_ERR(hwpt))
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return hwpt;
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INIT_LIST_HEAD(&hwpt->devices);
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INIT_LIST_HEAD(&hwpt->hwpt_item);
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mutex_init(&hwpt->devices_lock);
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/* Pairs with iommufd_hw_pagetable_destroy() */
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refcount_inc(&ioas->obj.users);
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hwpt->ioas = ioas;
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hwpt->domain = iommu_domain_alloc(idev->dev->bus);
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if (!hwpt->domain) {
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rc = -ENOMEM;
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goto out_abort;
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}
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mutex_lock(&hwpt->devices_lock);
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/*
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* immediate_attach exists only to accommodate iommu drivers that cannot
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* directly allocate a domain. These drivers do not finish creating the
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* domain until attach is completed. Thus we must have this call
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* sequence. Once those drivers are fixed this should be removed.
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*/
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if (immediate_attach) {
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rc = iommufd_hw_pagetable_attach(hwpt, idev);
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if (rc)
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goto out_unlock;
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}
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rc = iopt_table_add_domain(&hwpt->ioas->iopt, hwpt->domain);
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if (rc)
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goto out_detach;
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list_add_tail(&hwpt->hwpt_item, &hwpt->ioas->hwpt_list);
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if (immediate_attach) {
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/* See iommufd_device_do_attach() */
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refcount_inc(&hwpt->obj.users);
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idev->hwpt = hwpt;
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list_add(&idev->devices_item, &hwpt->devices);
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}
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mutex_unlock(&hwpt->devices_lock);
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return hwpt;
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out_detach:
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if (immediate_attach)
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iommufd_hw_pagetable_detach(hwpt, idev);
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out_unlock:
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mutex_unlock(&hwpt->devices_lock);
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out_abort:
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iommufd_object_abort_and_destroy(ictx, &hwpt->obj);
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return ERR_PTR(rc);
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}
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