blob: e3f738eb1cacc73d97ccaf4d10c770716ae469b8 [file] [log] [blame]
Mahesh Salgaonkarfd7bacb2016-05-15 09:44:26 +05301/*
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
28void 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
48void 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}