1 /* 2 * Reset handlers. 3 * 4 * Copyright (c) 2003-2008 Fabrice Bellard 5 * Copyright (c) 2016 Red Hat, Inc. 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "qemu/queue.h" 28 #include "sysemu/reset.h" 29 #include "hw/resettable.h" 30 #include "hw/core/resetcontainer.h" 31 32 /* 33 * Return a pointer to the singleton container that holds all the Resettable 34 * items that will be reset when qemu_devices_reset() is called. 35 */ 36 static ResettableContainer *get_root_reset_container(void) 37 { 38 static ResettableContainer *root_reset_container; 39 40 if (!root_reset_container) { 41 root_reset_container = 42 RESETTABLE_CONTAINER(object_new(TYPE_RESETTABLE_CONTAINER)); 43 } 44 return root_reset_container; 45 } 46 47 typedef struct QEMUResetEntry { 48 QTAILQ_ENTRY(QEMUResetEntry) entry; 49 QEMUResetHandler *func; 50 void *opaque; 51 bool skip_on_snapshot_load; 52 } QEMUResetEntry; 53 54 static QTAILQ_HEAD(, QEMUResetEntry) reset_handlers = 55 QTAILQ_HEAD_INITIALIZER(reset_handlers); 56 57 void qemu_register_reset(QEMUResetHandler *func, void *opaque) 58 { 59 QEMUResetEntry *re = g_new0(QEMUResetEntry, 1); 60 61 re->func = func; 62 re->opaque = opaque; 63 QTAILQ_INSERT_TAIL(&reset_handlers, re, entry); 64 } 65 66 void qemu_register_reset_nosnapshotload(QEMUResetHandler *func, void *opaque) 67 { 68 QEMUResetEntry *re = g_new0(QEMUResetEntry, 1); 69 70 re->func = func; 71 re->opaque = opaque; 72 re->skip_on_snapshot_load = true; 73 QTAILQ_INSERT_TAIL(&reset_handlers, re, entry); 74 } 75 76 void qemu_unregister_reset(QEMUResetHandler *func, void *opaque) 77 { 78 QEMUResetEntry *re; 79 80 QTAILQ_FOREACH(re, &reset_handlers, entry) { 81 if (re->func == func && re->opaque == opaque) { 82 QTAILQ_REMOVE(&reset_handlers, re, entry); 83 g_free(re); 84 return; 85 } 86 } 87 } 88 89 void qemu_register_resettable(Object *obj) 90 { 91 resettable_container_add(get_root_reset_container(), obj); 92 } 93 94 void qemu_unregister_resettable(Object *obj) 95 { 96 resettable_container_remove(get_root_reset_container(), obj); 97 } 98 99 void qemu_devices_reset(ShutdownCause reason) 100 { 101 QEMUResetEntry *re, *nre; 102 103 /* reset all devices */ 104 QTAILQ_FOREACH_SAFE(re, &reset_handlers, entry, nre) { 105 if (reason == SHUTDOWN_CAUSE_SNAPSHOT_LOAD && 106 re->skip_on_snapshot_load) { 107 continue; 108 } 109 re->func(re->opaque); 110 } 111 112 /* Reset the simulation */ 113 resettable_reset(OBJECT(get_root_reset_container()), RESET_TYPE_COLD); 114 } 115