61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/**
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* intel-pasid.c - PASID idr, table and entry manipulation
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*
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* Copyright (C) 2018 Intel Corporation
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*
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* Author: Lu Baolu <baolu.lu@linux.intel.com>
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*/
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#define pr_fmt(fmt) "DMAR: " fmt
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#include <linux/dmar.h>
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#include <linux/intel-iommu.h>
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#include <linux/iommu.h>
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#include <linux/memory.h>
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#include <linux/spinlock.h>
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#include "intel-pasid.h"
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/*
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* Intel IOMMU system wide PASID name space:
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*/
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static DEFINE_SPINLOCK(pasid_lock);
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u32 intel_pasid_max_id = PASID_MAX;
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static DEFINE_IDR(pasid_idr);
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int intel_pasid_alloc_id(void *ptr, int start, int end, gfp_t gfp)
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{
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int ret, min, max;
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min = max_t(int, start, PASID_MIN);
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max = min_t(int, end, intel_pasid_max_id);
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WARN_ON(in_interrupt());
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idr_preload(gfp);
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spin_lock(&pasid_lock);
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ret = idr_alloc(&pasid_idr, ptr, min, max, GFP_ATOMIC);
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spin_unlock(&pasid_lock);
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idr_preload_end();
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return ret;
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}
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void intel_pasid_free_id(int pasid)
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{
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spin_lock(&pasid_lock);
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idr_remove(&pasid_idr, pasid);
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spin_unlock(&pasid_lock);
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}
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void *intel_pasid_lookup_id(int pasid)
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{
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void *p;
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spin_lock(&pasid_lock);
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p = idr_find(&pasid_idr, pasid);
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spin_unlock(&pasid_lock);
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return p;
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}
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