diff options
Diffstat (limited to 'hw/watchdog/spapr_watchdog.c')
| -rw-r--r-- | hw/watchdog/spapr_watchdog.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/hw/watchdog/spapr_watchdog.c b/hw/watchdog/spapr_watchdog.c new file mode 100644 index 0000000000..55ff1f03c1 --- /dev/null +++ b/hw/watchdog/spapr_watchdog.c @@ -0,0 +1,274 @@ +/* + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library 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 + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, see <http://www.gnu.org/licenses/>. + */ + +#include "qemu/osdep.h" +#include "qapi/error.h" +#include "target/ppc/cpu.h" +#include "migration/vmstate.h" +#include "trace.h" + +#include "hw/ppc/spapr.h" + +#define FIELD_BE(reg, field, start, len) \ + FIELD(reg, field, 64 - (start + len), len) + +/* + * Bits 47: "leaveOtherWatchdogsRunningOnTimeout", specified on + * the "Start watchdog" operation, + * 0 - stop out-standing watchdogs on timeout, + * 1 - leave outstanding watchdogs running on timeout + */ +FIELD_BE(PSERIES_WDTF, LEAVE_OTHER, 47, 1) + +/* Bits 48-55: "operation" */ +FIELD_BE(PSERIES_WDTF, OP, 48, 8) +#define PSERIES_WDTF_OP_START 0x1 +#define PSERIES_WDTF_OP_STOP 0x2 +#define PSERIES_WDTF_OP_QUERY 0x3 +#define PSERIES_WDTF_OP_QUERY_LPM 0x4 + +/* Bits 56-63: "timeoutAction" */ +FIELD_BE(PSERIES_WDTF, ACTION, 56, 8) +#define PSERIES_WDTF_ACTION_HARD_POWER_OFF 0x1 +#define PSERIES_WDTF_ACTION_HARD_RESTART 0x2 +#define PSERIES_WDTF_ACTION_DUMP_RESTART 0x3 + +FIELD_BE(PSERIES_WDTF, RESERVED, 0, 47) + +/* Special watchdogNumber for the "stop all watchdogs" operation */ +#define PSERIES_WDT_STOP_ALL ((uint64_t)~0) + +/* + * For the "Query watchdog capabilities" operation, a uint64 structure + * defined as: + * Bits 0-15: The minimum supported timeout in milliseconds + * Bits 16-31: The number of watchdogs supported + * Bits 32-63: Reserved + */ +FIELD_BE(PSERIES_WDTQ, MIN_TIMEOUT, 0, 16) +FIELD_BE(PSERIES_WDTQ, NUM, 16, 16) + +/* + * For the "Query watchdog LPM requirement" operation: + * 1 = The given "watchdogNumber" must be stopped prior to suspending + * 2 = The given "watchdogNumber" does not have to be stopped prior to + * suspending + */ +#define PSERIES_WDTQL_STOPPED 1 +#define PSERIES_WDTQL_QUERY_NOT_STOPPED 2 + +#define WDT_MIN_TIMEOUT 1 /* 1ms */ + +static target_ulong watchdog_stop(unsigned watchdogNumber, SpaprWatchdog *w) +{ + target_ulong ret = H_NOOP; + + if (timer_pending(&w->timer)) { + timer_del(&w->timer); + ret = H_SUCCESS; + } + trace_spapr_watchdog_stop(watchdogNumber, ret); + + return ret; +} + +static target_ulong watchdog_stop_all(SpaprMachineState *spapr) +{ + target_ulong ret = H_NOOP; + int i; + + for (i = 1; i <= ARRAY_SIZE(spapr->wds); ++i) { + target_ulong r = watchdog_stop(i, &spapr->wds[i - 1]); + + if (r != H_NOOP && r != H_SUCCESS) { + ret = r; + } + } + + return ret; +} + +static void watchdog_expired(void *pw) +{ + SpaprWatchdog *w = pw; + CPUState *cs; + SpaprMachineState *spapr = SPAPR_MACHINE(qdev_get_machine()); + unsigned num = w - spapr->wds; + + g_assert(num < ARRAY_SIZE(spapr->wds)); + trace_spapr_watchdog_expired(num, w->action); + switch (w->action) { + case PSERIES_WDTF_ACTION_HARD_POWER_OFF: + qemu_system_vmstop_request(RUN_STATE_SHUTDOWN); + break; + case PSERIES_WDTF_ACTION_HARD_RESTART: + qemu_system_reset_request(SHUTDOWN_CAUSE_GUEST_RESET); + break; + case PSERIES_WDTF_ACTION_DUMP_RESTART: + CPU_FOREACH(cs) { + async_run_on_cpu(cs, spapr_do_system_reset_on_cpu, RUN_ON_CPU_NULL); + } + break; + } + if (!w->leave_others) { + watchdog_stop_all(spapr); + } +} + +static target_ulong h_watchdog(PowerPCCPU *cpu, + SpaprMachineState *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong ret = H_SUCCESS; + target_ulong flags = args[0]; + target_ulong watchdogNumber = args[1]; /* 1-Based per PAPR */ + target_ulong timeoutInMs = args[2]; + unsigned operation = FIELD_EX64(flags, PSERIES_WDTF, OP); + unsigned timeoutAction = FIELD_EX64(flags, PSERIES_WDTF, ACTION); + SpaprWatchdog *w; + + if (FIELD_EX64(flags, PSERIES_WDTF, RESERVED)) { + return H_PARAMETER; + } + + switch (operation) { + case PSERIES_WDTF_OP_START: + if (watchdogNumber > ARRAY_SIZE(spapr->wds)) { + return H_P2; + } + if (timeoutInMs <= WDT_MIN_TIMEOUT) { + return H_P3; + } + + w = &spapr->wds[watchdogNumber - 1]; + switch (timeoutAction) { + case PSERIES_WDTF_ACTION_HARD_POWER_OFF: + case PSERIES_WDTF_ACTION_HARD_RESTART: + case PSERIES_WDTF_ACTION_DUMP_RESTART: + w->action = timeoutAction; + break; + default: + return H_PARAMETER; + } + w->leave_others = FIELD_EX64(flags, PSERIES_WDTF, LEAVE_OTHER); + timer_mod(&w->timer, + qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + timeoutInMs); + trace_spapr_watchdog_start(flags, watchdogNumber, timeoutInMs); + break; + case PSERIES_WDTF_OP_STOP: + if (watchdogNumber == PSERIES_WDT_STOP_ALL) { + ret = watchdog_stop_all(spapr); + } else if (watchdogNumber <= ARRAY_SIZE(spapr->wds)) { + ret = watchdog_stop(watchdogNumber, + &spapr->wds[watchdogNumber - 1]); + } else { + return H_P2; + } + break; + case PSERIES_WDTF_OP_QUERY: + args[0] = FIELD_DP64(0, PSERIES_WDTQ, MIN_TIMEOUT, WDT_MIN_TIMEOUT); + args[0] = FIELD_DP64(args[0], PSERIES_WDTQ, NUM, + ARRAY_SIZE(spapr->wds)); + trace_spapr_watchdog_query(args[0]); + break; + case PSERIES_WDTF_OP_QUERY_LPM: + if (watchdogNumber > ARRAY_SIZE(spapr->wds)) { + return H_P2; + } + args[0] = PSERIES_WDTQL_QUERY_NOT_STOPPED; + trace_spapr_watchdog_query_lpm(args[0]); + break; + default: + return H_PARAMETER; + } + + return ret; +} + +void spapr_watchdog_init(SpaprMachineState *spapr) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(spapr->wds); ++i) { + char name[16]; + SpaprWatchdog *w = &spapr->wds[i]; + + snprintf(name, sizeof(name) - 1, "wdt%d", i + 1); + object_initialize_child_with_props(OBJECT(spapr), name, w, + sizeof(SpaprWatchdog), + TYPE_SPAPR_WDT, + &error_fatal, NULL); + qdev_realize(DEVICE(w), NULL, &error_fatal); + } +} + +static bool watchdog_needed(void *opaque) +{ + SpaprWatchdog *w = opaque; + + return timer_pending(&w->timer); +} + +static const VMStateDescription vmstate_wdt = { + .name = "spapr_watchdog", + .version_id = 1, + .minimum_version_id = 1, + .needed = watchdog_needed, + .fields = (VMStateField[]) { + VMSTATE_TIMER(timer, SpaprWatchdog), + VMSTATE_UINT8(action, SpaprWatchdog), + VMSTATE_UINT8(leave_others, SpaprWatchdog), + VMSTATE_END_OF_LIST() + } +}; + +static void spapr_wdt_realize(DeviceState *dev, Error **errp) +{ + SpaprWatchdog *w = SPAPR_WDT(dev); + Object *o = OBJECT(dev); + + timer_init_ms(&w->timer, QEMU_CLOCK_VIRTUAL, watchdog_expired, w); + + object_property_add_uint64_ptr(o, "expire", + (uint64_t *)&w->timer.expire_time, + OBJ_PROP_FLAG_READ); + object_property_add_uint8_ptr(o, "action", &w->action, OBJ_PROP_FLAG_READ); + object_property_add_uint8_ptr(o, "leaveOtherWatchdogsRunningOnTimeout", + &w->leave_others, OBJ_PROP_FLAG_READ); +} + +static void spapr_wdt_class_init(ObjectClass *oc, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(oc); + + dc->realize = spapr_wdt_realize; + dc->vmsd = &vmstate_wdt; + dc->user_creatable = false; +} + +static const TypeInfo spapr_wdt_info = { + .name = TYPE_SPAPR_WDT, + .parent = TYPE_DEVICE, + .instance_size = sizeof(SpaprWatchdog), + .class_init = spapr_wdt_class_init, +}; + +static void spapr_watchdog_register_types(void) +{ + spapr_register_hypercall(H_WATCHDOG, h_watchdog); + type_register_static(&spapr_wdt_info); +} + +type_init(spapr_watchdog_register_types) |