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// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2024, NVIDIA CORPORATION & AFFILIATES
*/
#include "iommufd_private.h"
struct iommufd_object *_iommufd_object_alloc(struct iommufd_ctx *ictx,
size_t size,
enum iommufd_object_type type)
{
struct iommufd_object *obj;
int rc;
obj = kzalloc(size, GFP_KERNEL_ACCOUNT);
if (!obj)
return ERR_PTR(-ENOMEM);
obj->type = type;
/* Starts out bias'd by 1 until it is removed from the xarray */
refcount_set(&obj->shortterm_users, 1);
refcount_set(&obj->users, 1);
/*
* Reserve an ID in the xarray but do not publish the pointer yet since
* the caller hasn't initialized it yet. Once the pointer is published
* in the xarray and visible to other threads we can't reliably destroy
* it anymore, so the caller must complete all errorable operations
* before calling iommufd_object_finalize().
*/
rc = xa_alloc(&ictx->objects, &obj->id, XA_ZERO_ENTRY, xa_limit_31b,
GFP_KERNEL_ACCOUNT);
if (rc)
goto out_free;
return obj;
out_free:
kfree(obj);
return ERR_PTR(rc);
}
EXPORT_SYMBOL_NS_GPL(_iommufd_object_alloc, IOMMUFD);
/* Caller should xa_lock(&viommu->vdevs) to protect the return value */
struct device *iommufd_viommu_find_dev(struct iommufd_viommu *viommu,
unsigned long vdev_id)
{
struct iommufd_vdevice *vdev;
lockdep_assert_held(&viommu->vdevs.xa_lock);
vdev = xa_load(&viommu->vdevs, vdev_id);
return vdev ? vdev->dev : NULL;
}
EXPORT_SYMBOL_NS_GPL(iommufd_viommu_find_dev, IOMMUFD);
MODULE_DESCRIPTION("iommufd code shared with builtin modules");
MODULE_LICENSE("GPL");
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