Commit | Line | Data |
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fd7bacbc MS |
1 | /* |
2 | * Hypervisor Maintenance Interrupt (HMI) handling. | |
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 | #undef DEBUG | |
22 | ||
23 | #include <linux/types.h> | |
24 | #include <linux/compiler.h> | |
25 | #include <asm/paca.h> | |
26 | #include <asm/hmi.h> | |
27 | ||
28 | void wait_for_subcore_guest_exit(void) | |
29 | { | |
30 | int i; | |
31 | ||
32 | /* | |
33 | * NULL bitmap pointer indicates that KVM module hasn't | |
34 | * been loaded yet and hence no guests are running. | |
35 | * If no KVM is in use, no need to co-ordinate among threads | |
36 | * as all of them will always be in host and no one is going | |
37 | * to modify TB other than the opal hmi handler. | |
38 | * Hence, just return from here. | |
39 | */ | |
40 | if (!local_paca->sibling_subcore_state) | |
41 | return; | |
42 | ||
43 | for (i = 0; i < MAX_SUBCORE_PER_CORE; i++) | |
44 | while (local_paca->sibling_subcore_state->in_guest[i]) | |
45 | cpu_relax(); | |
46 | } | |
47 | ||
48 | void wait_for_tb_resync(void) | |
49 | { | |
50 | if (!local_paca->sibling_subcore_state) | |
51 | return; | |
52 | ||
53 | while (test_bit(CORE_TB_RESYNC_REQ_BIT, | |
54 | &local_paca->sibling_subcore_state->flags)) | |
55 | cpu_relax(); | |
56 | } |