Commit 7691c4ae authored by Christophe Lombard's avatar Christophe Lombard Committed by Reza Arbab
Browse files

core/pldm: Handle Watchdog timer.


Encode a PLDM platform event message to send the heartbeat to the BMC.
Watchdog is "armed" when a
PLDM_EVENT_MESSAGE_GLOBAL_ENABLE_ASYNC_KEEP_ALIVE is received.
Signed-off-by: default avatarChristophe Lombard <clombard@linux.ibm.com>
Signed-off-by: default avatarReza Arbab <arbab@linux.ibm.com>
parent e172f39a
......@@ -11,6 +11,7 @@ PLDM_OBJS = pldm-mctp.o pldm-responder.o pldm-requester.o
PLDM_OBJS += pldm-base-requests.o pldm-platform-requests.o
PLDM_OBJS += pldm-bios-requests.o pldm-fru-requests.o
PLDM_OBJS += pldm-file-io-requests.o pldm-lid-files.o
PLDM_OBJS += pldm-watchdog.o
PLDM = $(PLDM_DIR)/built-in.a
$(PLDM): $(PLDM_OBJS:%=$(PLDM_DIR)/%)
// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
// Copyright 2022 IBM Corp.
#define pr_fmt(fmt) "PLDM: " fmt
#include <lock.h>
#include <stdlib.h>
#include <string.h>
#include <opal.h>
#include <timebase.h>
#include <timer.h>
#include <pldm/include/libpldm/platform.h>
#include "pldm.h"
#define DEFAULT_WATCHDOG_TIMEOUT_SEC (10 * 60) /* 10 min */
/* Whether the watchdog timer is armed and Skiboot should be sending
* regular heartbeats.
*/
bool watchdog_armed;
/* The period (in seconds) of the PLDM watchdog, as dictated by BMC */
int watchdog_period_sec = DEFAULT_WATCHDOG_TIMEOUT_SEC;
static uint8_t sequence_number;
struct timer watchdog_timer;
static void watchdog_reset_timer_complete(struct pldm_rx_data *rx,
void *data __unused)
{
struct pldm_platform_event_message_resp response;
size_t payload_len;
int rc;
if (rx == NULL) {
prlog(PR_ERR, "%s: Response not received\n", __func__);
return;
}
/* Decode the message */
payload_len = rx->msg_len - sizeof(struct pldm_msg_hdr);
rc = decode_platform_event_message_resp(
rx->msg,
payload_len,
&response.completion_code,
&response.platform_event_status);
if (rc != PLDM_SUCCESS || response.completion_code != PLDM_SUCCESS) {
prlog(PR_ERR, "Decode PlatformEventMessage Error, rc: %d, cc: %d, pes: %d\n",
rc, response.completion_code,
response.platform_event_status);
}
}
static int pldm_watchdog_reset_timer(void)
{
uint8_t heartbeat_elapsed_data[2];
struct pldm_tx_data *tx;
size_t payload_len;
size_t data_size;
int rc;
struct pldm_platform_event_message_req event_message_req = {
.format_version = PLDM_PLATFORM_EVENT_MESSAGE_FORMAT_VERSION,
.tid = HOST_TID,
.event_class = PLDM_HEARTBEAT_TIMER_ELAPSED_EVENT,
};
prlog(PR_TRACE, "%s - send the heartbeat to the BMC, sequence: %d, period: %d\n",
__func__, sequence_number, watchdog_period_sec);
/* Send the event request */
heartbeat_elapsed_data[0] = PLDM_PLATFORM_EVENT_MESSAGE_FORMAT_VERSION;
/* We need to make sure that we send the BMC the correct
* sequence number. To prevent possible race conditions for the
* sequence number, lock it while we're incrementing and
* sending it down.
*/
heartbeat_elapsed_data[1] = sequence_number++;
payload_len = PLDM_PLATFORM_EVENT_MESSAGE_MIN_REQ_BYTES + sizeof(heartbeat_elapsed_data);
data_size = sizeof(struct pldm_msg_hdr) +
sizeof(struct pldm_platform_event_message_req) +
sizeof(heartbeat_elapsed_data);
tx = zalloc(sizeof(struct pldm_tx_data) + data_size);
if (!tx)
return OPAL_NO_MEM;
tx->data_size = data_size - 1;
/* Encode the platform event message request */
rc = encode_platform_event_message_req(
DEFAULT_INSTANCE_ID,
event_message_req.format_version,
event_message_req.tid,
event_message_req.event_class,
heartbeat_elapsed_data,
sizeof(heartbeat_elapsed_data),
(struct pldm_msg *)tx->data,
payload_len);
if (rc != PLDM_SUCCESS) {
prlog(PR_ERR, "Encode PlatformEventMessage Error, rc: %d\n", rc);
free(tx);
return OPAL_PARAMETER;
}
/* Send and get the response message bytes */
rc = pldm_requester_queue(tx, watchdog_reset_timer_complete, NULL);
if (rc) {
prlog(PR_ERR, "Communication Error, req: PlatformEventMessage, rc: %d\n", rc);
free(tx);
return rc;
}
free(tx);
return OPAL_SUCCESS;
}
static void watchdog_poller(struct timer *t __unused,
void *data __unused,
uint64_t now __unused)
{
/* Whether the watchdog timer is armed and Skiboot should be sending
* regular heartbeats.
*/
if (watchdog_armed)
pldm_watchdog_reset_timer();
schedule_timer(&watchdog_timer, secs_to_tb(watchdog_period_sec));
}
int pldm_watchdog_init(void)
{
if (watchdog_armed)
pldm_watchdog_reset_timer();
init_timer(&watchdog_timer, watchdog_poller, NULL);
schedule_timer(&watchdog_timer, secs_to_tb(watchdog_period_sec));
return OPAL_SUCCESS;
}
......@@ -48,4 +48,9 @@ int pldm_lid_files_init(struct blocklevel_device **bl);
*/
bool pldm_lid_files_exit(struct blocklevel_device *bl);
/**
* Initialize and reset the watchdog
*/
int pldm_watchdog_init(void);
#endif /* __PLDM_H__ */
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