arch/powerpc/include/asm/hmi.h

   1 /*
   2  * Hypervisor Maintenance Interrupt header file.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.
  16  *
  17  * Copyright 2015 IBM Corporation
  18  * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
  19  */
  20
  21 #ifndef __ASM_PPC64_HMI_H__
  22 #define __ASM_PPC64_HMI_H__
  23
  24 #ifdef CONFIG_PPC_BOOK3S_64
  25
  26 #define CORE_TB_RESYNC_REQ_BIT          63
  27 #define MAX_SUBCORE_PER_CORE            4
  28
  29 /*
  30  * sibling_subcore_state structure is used to co-ordinate all threads
  31  * during HMI to avoid TB corruption. This structure is allocated once
  32  * per each core and shared by all threads on that core.
  33  */
  34 struct sibling_subcore_state {
  35         unsigned long   flags;
  36         u8              in_guest[MAX_SUBCORE_PER_CORE];
  37 };
  38
  39 extern void wait_for_subcore_guest_exit(void);
  40 extern void wait_for_tb_resync(void);
  41 #else
  42 static inline void wait_for_subcore_guest_exit(void) { }
  43 static inline void wait_for_tb_resync(void) { }
  44 #endif
  45 #endif /* __ASM_PPC64_HMI_H__ */