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  */
22 struct sibling_subcore_state {
23 	unsigned long	flags;
24 	u8		in_guest[MAX_SUBCORE_PER_CORE];
25 };
26 
27 extern void wait_for_subcore_guest_exit(void);
28 extern void wait_for_tb_resync(void);
29 #else
wait_for_subcore_guest_exit(void)30 static inline void wait_for_subcore_guest_exit(void) { }
wait_for_tb_resync(void)31 static inline void wait_for_tb_resync(void) { }
32 #endif
33 
34 struct pt_regs;
35 extern long hmi_handle_debugtrig(struct pt_regs *regs);
36 
37 #endif /* __ASM_PPC64_HMI_H__ */
38