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