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The new PAPR 2.12 defines a watchdog facility managed via the new H_WATCHDOG hypercall. This adds H_WATCHDOG support which a proposed driver for pseries uses: https://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=303120 This was tested by running QEMU with a debug kernel and command line: -append \ "pseries-wdt.timeout=60 pseries-wdt.nowayout=1 pseries-wdt.action=2" and running "echo V > /dev/watchdog0" inside the VM. Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Reviewed-by: Cédric Le Goater <clg@kaod.org> Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20220622051008.1067464-1-aik@ozlabs.ru> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>pull/213/head
Alexey Kardashevskiy
4 years ago
committed by
Daniel Henrique Barboza
Daniel Henrique Barboza
5 changed files with 310 additions and 1 deletions
@ -0,0 +1,274 @@ |
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/*
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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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