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