1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * Hypervisor Maintenance Interrupt header file.
4 *
5 * Copyright 2015 IBM Corporation
6 * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>
7 */
8
9#ifndef __ASM_PPC64_HMI_H__
10#define __ASM_PPC64_HMI_H__
11
12#ifdef CONFIG_KVM_BOOK3S_HV_POSSIBLE
13
14#define	CORE_TB_RESYNC_REQ_BIT		63
15#define MAX_SUBCORE_PER_CORE		4
16
17/*
18 * sibling_subcore_state structure is used to co-ordinate all threads
19 * during HMI to avoid TB corruption. This structure is allocated once
20 * per each core and shared by all threads on that core.
21 */
22struct sibling_subcore_state {
23	unsigned long	flags;
24	u8		in_guest[MAX_SUBCORE_PER_CORE];
25};
26
27extern void wait_for_subcore_guest_exit(void);
28extern void wait_for_tb_resync(void);
29#else
30static inline void wait_for_subcore_guest_exit(void) { }
31static inline void wait_for_tb_resync(void) { }
32#endif
33
34struct pt_regs;
35extern long hmi_handle_debugtrig(struct pt_regs *regs);
36
37#endif /* __ASM_PPC64_HMI_H__ */
38