hw/watchdog/spapr_watchdog.c - qemu - Git at Google

 /*
  * 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)
	/*
	* 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)