| Mahesh Salgaonkar | fd7bacb | 2016-05-15 09:44:26 +0530 | [diff] [blame] | 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 | } |