/* * watchdog device diag288 support * * Copyright IBM, Corp. 2015 * * Authors: * Xu Wang <gesaint@linux.vnet.ibm.com> * * This work is licensed under the terms of the GNU GPL, version 2 or (at your * option) any later version. See the COPYING file in the top-level directory. * */ #include "qemu/osdep.h" #include "sysemu/watchdog.h" #include "hw/sysbus.h" #include "qemu/timer.h" #include "hw/watchdog/wdt_diag288.h" #include "qemu/log.h" static WatchdogTimerModel model = { .wdt_name = TYPE_WDT_DIAG288, .wdt_description = "diag288 device for s390x platform", }; static const VMStateDescription vmstate_diag288 = { .name = "vmstate_diag288", .version_id = 0, .minimum_version_id = 0, .fields = (VMStateField[]) { VMSTATE_TIMER_PTR(timer, DIAG288State), VMSTATE_BOOL(enabled, DIAG288State), VMSTATE_END_OF_LIST() } }; static void wdt_diag288_reset(DeviceState *dev) { DIAG288State *diag288 = DIAG288(dev); diag288->enabled = false; timer_del(diag288->timer); } static void diag288_reset(void *opaque) { DeviceState *diag288 = opaque; wdt_diag288_reset(diag288); } static void diag288_timer_expired(void *dev) { qemu_log_mask(CPU_LOG_RESET, "Watchdog timer expired.\n"); /* Reset the watchdog only if the guest gets notified about * expiry. watchdog_perform_action() may temporarily relinquish * the BQL; reset before triggering the action to avoid races with * diag288 instructions. */ switch (get_watchdog_action()) { case WDT_DEBUG: case WDT_NONE: case WDT_PAUSE: break; default: wdt_diag288_reset(dev); } watchdog_perform_action(); } static int wdt_diag288_handle_timer(DIAG288State *diag288, uint64_t func, uint64_t timeout) { switch (func) { case WDT_DIAG288_INIT: diag288->enabled = true; /* fall through */ case WDT_DIAG288_CHANGE: if (!diag288->enabled) { return -1; } timer_mod(diag288->timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + timeout * NANOSECONDS_PER_SECOND); break; case WDT_DIAG288_CANCEL: if (!diag288->enabled) { return -1; } diag288->enabled = false; timer_del(diag288->timer); break; default: return -1; } return 0; } static void wdt_diag288_realize(DeviceState *dev, Error **errp) { DIAG288State *diag288 = DIAG288(dev); qemu_register_reset(diag288_reset, diag288); diag288->timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, diag288_timer_expired, dev); } static void wdt_diag288_unrealize(DeviceState *dev, Error **errp) { DIAG288State *diag288 = DIAG288(dev); timer_del(diag288->timer); timer_free(diag288->timer); } static void wdt_diag288_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); DIAG288Class *diag288 = DIAG288_CLASS(klass); dc->realize = wdt_diag288_realize; dc->unrealize = wdt_diag288_unrealize; dc->reset = wdt_diag288_reset; set_bit(DEVICE_CATEGORY_MISC, dc->categories); dc->vmsd = &vmstate_diag288; diag288->handle_timer = wdt_diag288_handle_timer; } static const TypeInfo wdt_diag288_info = { .class_init = wdt_diag288_class_init, .parent = TYPE_DEVICE, .name = TYPE_WDT_DIAG288, .instance_size = sizeof(DIAG288State), .class_size = sizeof(DIAG288Class), }; static void wdt_diag288_register_types(void) { watchdog_add_model(&model); type_register_static(&wdt_diag288_info); } type_init(wdt_diag288_register_types)