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/*
* ICSWX and ACOP/PID Management
*
* Copyright (C) 2011 Anton Blanchard, IBM Corp. <anton@samba.org>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/spinlock.h>
#include <linux/idr.h>
#include <linux/module.h>
#include "icswx.h"
#define COP_PID_MIN (COP_PID_NONE + 1)
#define COP_PID_MAX (0xFFFF)
static DEFINE_IDA(cop_ida);
static int new_cop_pid(struct ida *ida)
{
return ida_get_range(ida, COP_PID_MIN, COP_PID_MAX, GFP_KERNEL);
}
int get_cop_pid(struct mm_struct *mm)
{
int pid;
if (mm->context.cop_pid == COP_PID_NONE) {
pid = new_cop_pid(&cop_ida);
if (pid >= 0)
mm->context.cop_pid = pid;
}
return mm->context.cop_pid;
}
int disable_cop_pid(struct mm_struct *mm)
{
int free_pid = COP_PID_NONE;
if ((!mm->context.acop) && (mm->context.cop_pid != COP_PID_NONE)) {
free_pid = mm->context.cop_pid;
mm->context.cop_pid = COP_PID_NONE;
}
return free_pid;
}
void free_cop_pid(int free_pid)
{
ida_remove(&cop_ida, free_pid);
}
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