/* * ICSWX and ACOP/PID Management * * Copyright (C) 2011 Anton Blanchard, IBM Corp. * * 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 #include #include #include #include #include #include #include #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); }