| /* | |
| * Hypervisor Maintenance Interrupt (HMI) handling. | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation; either version 2 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program. | |
| * | |
| * Copyright 2015 IBM Corporation | |
| * Author: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> | |
| */ | |
| #undef DEBUG | |
| #include <linux/types.h> | |
| #include <linux/compiler.h> | |
| #include <asm/paca.h> | |
| #include <asm/hmi.h> | |
| void wait_for_subcore_guest_exit(void) | |
| { | |
| int i; | |
| /* | |
| * NULL bitmap pointer indicates that KVM module hasn't | |
| * been loaded yet and hence no guests are running. | |
| * If no KVM is in use, no need to co-ordinate among threads | |
| * as all of them will always be in host and no one is going | |
| * to modify TB other than the opal hmi handler. | |
| * Hence, just return from here. | |
| */ | |
| if (!local_paca->sibling_subcore_state) | |
| return; | |
| for (i = 0; i < MAX_SUBCORE_PER_CORE; i++) | |
| while (local_paca->sibling_subcore_state->in_guest[i]) | |
| cpu_relax(); | |
| } | |
| void wait_for_tb_resync(void) | |
| { | |
| if (!local_paca->sibling_subcore_state) | |
| return; | |
| while (test_bit(CORE_TB_RESYNC_REQ_BIT, | |
| &local_paca->sibling_subcore_state->flags)) | |
| cpu_relax(); | |
| } |