ppc/spapr: Implement H_WATCHDOG
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>
diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index fd4942e..9a5382d 100644
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -898,6 +898,8 @@
add_str(hypertas, "hcall-hpt-resize");
}
+ add_str(hypertas, "hcall-watchdog");
+
_FDT(fdt_setprop(fdt, rtas, "ibm,hypertas-functions",
hypertas->str, hypertas->len));
g_string_free(hypertas, TRUE);
@@ -3051,6 +3053,8 @@
spapr->vof->fw_size = fw_size; /* for claim() on itself */
spapr_register_hypercall(KVMPPC_H_VOF_CLIENT, spapr_h_vof_client);
}
+
+ spapr_watchdog_init(spapr);
}
#define DEFAULT_KVM_TYPE "auto"
diff --git a/hw/watchdog/meson.build b/hw/watchdog/meson.build
index 054c403..8974b5c 100644
--- a/hw/watchdog/meson.build
+++ b/hw/watchdog/meson.build
@@ -6,3 +6,4 @@
softmmu_ss.add(when: 'CONFIG_ASPEED_SOC', if_true: files('wdt_aspeed.c'))
softmmu_ss.add(when: 'CONFIG_WDT_IMX2', if_true: files('wdt_imx2.c'))
softmmu_ss.add(when: 'CONFIG_WDT_SBSA', if_true: files('sbsa_gwdt.c'))
+specific_ss.add(when: 'CONFIG_PSERIES', if_true: files('spapr_watchdog.c'))
diff --git a/hw/watchdog/spapr_watchdog.c b/hw/watchdog/spapr_watchdog.c
new file mode 100644
index 0000000..55ff1f0
--- /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)
diff --git a/hw/watchdog/trace-events b/hw/watchdog/trace-events
index e7523e2..89ccbcf 100644
--- a/hw/watchdog/trace-events
+++ b/hw/watchdog/trace-events
@@ -9,3 +9,10 @@
# wdt-aspeed.c
aspeed_wdt_read(uint64_t addr, uint32_t size) "@0x%" PRIx64 " size=%d"
aspeed_wdt_write(uint64_t addr, uint32_t size, uint64_t data) "@0x%" PRIx64 " size=%d value=0x%"PRIx64
+
+# spapr_watchdog.c
+spapr_watchdog_start(uint64_t flags, uint64_t num, uint64_t timeout) "Flags 0x%" PRIx64 " num=%" PRId64 " %" PRIu64 "ms"
+spapr_watchdog_stop(uint64_t num, uint64_t ret) "num=%" PRIu64 " ret=%" PRId64
+spapr_watchdog_query(uint64_t caps) "caps=0x%" PRIx64
+spapr_watchdog_query_lpm(uint64_t caps) "caps=0x%" PRIx64
+spapr_watchdog_expired(uint64_t num, unsigned action) "num=%" PRIu64 " action=%u"
diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
index 4ba2b27..530d739 100644
--- a/include/hw/ppc/spapr.h
+++ b/include/hw/ppc/spapr.h
@@ -164,6 +164,21 @@
SpaprIrq *irq;
};
+#define WDT_MAX_WATCHDOGS 4 /* Maximum number of watchdog devices */
+
+#define TYPE_SPAPR_WDT "spapr-wdt"
+OBJECT_DECLARE_SIMPLE_TYPE(SpaprWatchdog, SPAPR_WDT)
+
+typedef struct SpaprWatchdog {
+ /*< private >*/
+ DeviceState parent_obj;
+ /*< public >*/
+
+ QEMUTimer timer;
+ uint8_t action; /* One of PSERIES_WDTF_ACTION_xxx */
+ uint8_t leave_others; /* leaveOtherWatchdogsRunningOnTimeout */
+} SpaprWatchdog;
+
/**
* SpaprMachineState:
*/
@@ -264,6 +279,8 @@
uint32_t FORM2_assoc_array[NUMA_NODES_MAX_NUM][FORM2_NUMA_ASSOC_SIZE];
Error *fwnmi_migration_blocker;
+
+ SpaprWatchdog wds[WDT_MAX_WATCHDOGS];
};
#define H_SUCCESS 0
@@ -344,6 +361,7 @@
#define H_P7 -60
#define H_P8 -61
#define H_P9 -62
+#define H_NOOP -63
#define H_UNSUPPORTED -67
#define H_OVERLAP -68
#define H_UNSUPPORTED_FLAG -256
@@ -564,8 +582,9 @@
#define H_SCM_HEALTH 0x400
#define H_RPT_INVALIDATE 0x448
#define H_SCM_FLUSH 0x44C
+#define H_WATCHDOG 0x45C
-#define MAX_HCALL_OPCODE H_SCM_FLUSH
+#define MAX_HCALL_OPCODE H_WATCHDOG
/* The hcalls above are standardized in PAPR and implemented by pHyp
* as well.
@@ -1028,6 +1047,7 @@
extern const VMStateDescription vmstate_spapr_cap_ccf_assist;
extern const VMStateDescription vmstate_spapr_cap_fwnmi;
extern const VMStateDescription vmstate_spapr_cap_rpt_invalidate;
+extern const VMStateDescription vmstate_spapr_wdt;
static inline uint8_t spapr_get_cap(SpaprMachineState *spapr, int cap)
{
@@ -1064,4 +1084,7 @@
target_ulong ovec_addr);
void spapr_vof_client_dt_finalize(SpaprMachineState *spapr, void *fdt);
+/* H_WATCHDOG */
+void spapr_watchdog_init(SpaprMachineState *spapr);
+
#endif /* HW_SPAPR_H */
