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/* Copyright 2013-2014 IBM Corp.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <skiboot.h>
#include <fsp.h>
#include <lock.h>
#include <processor.h>
#include <timebase.h>
#include <fsp-sysparam.h>
#include <errorlog.h>
#include <opal-api.h>
static bool fsp_surv_state = false;
static bool fsp_surv_ack_pending = false;
static u64 surv_timer;
static u64 surv_ack_timer;
static u32 surv_state_param;
static struct lock surv_lock = LOCK_UNLOCKED;
#define FSP_SURV_ACK_TIMEOUT 120 /* surv ack timeout in seconds */
DEFINE_LOG_ENTRY(OPAL_RC_SURVE_INIT, OPAL_MISC_ERR_EVT, OPAL_SURVEILLANCE,
OPAL_SURVEILLANCE_ERR, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_MISCELLANEOUS_INFO_ONLY);
DEFINE_LOG_ENTRY(OPAL_RC_SURVE_STATUS, OPAL_MISC_ERR_EVT, OPAL_SURVEILLANCE,
OPAL_SURVEILLANCE_ERR, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_MISCELLANEOUS_INFO_ONLY);
DEFINE_LOG_ENTRY(OPAL_RC_SURVE_ACK, OPAL_MISC_ERR_EVT, OPAL_SURVEILLANCE,
OPAL_SURVEILLANCE_ERR, OPAL_PREDICTIVE_ERR_GENERAL,
OPAL_MISCELLANEOUS_INFO_ONLY);
static void fsp_surv_ack(struct fsp_msg *msg)
{
uint8_t val;
if (!msg->resp)
return;
val = (msg->resp->word1 >> 8) & 0xff;
if (val == 0) {
/* reset the pending flag */
prlog(PR_DEBUG,
"SURV: Received heartbeat acknowledge from FSP\n");
lock(&surv_lock);
fsp_surv_ack_pending = false;
unlock(&surv_lock);
} else {
/**
* @fwts-label FSPHeartbeatAckError
* @fwts-advice Error in acknowledging heartbeat to FSP.
* This could mean the FSP has gone away or it may mean
* the FSP may kill us for missing too many heartbeats.
*/
prlog(PR_ERR,
"SURV: Heartbeat Acknowledgment error from FSP\n");
}
fsp_freemsg(msg);
}
static void fsp_surv_check_timeout(void)
{
u64 now = mftb();
/*
* We just checked fsp_surv_ack_pending to be true in fsp_surv_hbeat
* and we haven't dropped the surv_lock between then and now. So, we
* just go ahead and check timeouts.
*/
if (tb_compare(now, surv_ack_timer) == TB_AAFTERB) {
/* XXX: We should be logging a PEL to the host, assuming
* the FSP is dead, pending a R/R.
*/
log_simple_error(&e_info(OPAL_RC_SURVE_ACK),
"SURV: Surv ACK timed out; initiating R/R\n");
/* Reset the pending trigger too */
fsp_surv_ack_pending = false;
fsp_trigger_reset();
}
return;
}
/* Send surveillance heartbeat based on a timebase trigger */
static void fsp_surv_hbeat(void)
{
u64 now = mftb();
struct fsp_msg *msg;
/* Check if an ack is pending... if so, don't send the ping just yet */
if (fsp_surv_ack_pending) {
fsp_surv_check_timeout();
return;
}
/* add timebase callbacks */
/*
* XXX This packet needs to be pushed to FSP in an interval
* less than 120s that's advertised to FSP.
*
* Verify if the command building format and call is fine.
*/
if (surv_timer == 0 ||
(tb_compare(now, surv_timer) == TB_AAFTERB) ||
(tb_compare(now, surv_timer) == TB_AEQUALB)) {
prlog(PR_DEBUG,
"SURV: Sending the heartbeat command to FSP\n");
msg = fsp_mkmsg(FSP_CMD_SURV_HBEAT, 1, 120);
if (!msg) {
prerror("SURV: Failed to allocate heartbeat msg\n");
return;
}
if (fsp_queue_msg(msg, fsp_surv_ack)) {
fsp_freemsg(msg);
prerror("SURV: Failed to queue heartbeat msg\n");
} else {
fsp_surv_ack_pending = true;
surv_timer = now + secs_to_tb(60);
surv_ack_timer = now + secs_to_tb(FSP_SURV_ACK_TIMEOUT);
}
}
}
static void fsp_surv_poll(void *data __unused)
{
if (!fsp_surv_state)
return;
lock(&surv_lock);
fsp_surv_hbeat();
unlock(&surv_lock);
}
static void fsp_surv_got_param(uint32_t param_id __unused, int err_len,
void *data __unused)
{
if (err_len != 4) {
log_simple_error(&e_info(OPAL_RC_SURVE_STATUS),
"SURV: Error (%d) retrieving surv status; initiating R/R\n",
err_len);
fsp_trigger_reset();
return;
}
printf("SURV: Status from FSP: %d\n", surv_state_param);
if (!(surv_state_param & 0x01))
return;
lock(&surv_lock);
fsp_surv_state = true;
/* Also send one heartbeat now. The next one will not happen
* until we hit the OS.
*/
fsp_surv_hbeat();
unlock(&surv_lock);
}
void fsp_surv_query(void)
{
int rc;
printf("SURV: Querying FSP's surveillance status\n");
/* Reset surveillance settings */
lock(&surv_lock);
fsp_surv_state = false;
surv_timer = 0;
surv_ack_timer = 0;
unlock(&surv_lock);
/* Query FPS for surveillance state */
rc = fsp_get_sys_param(SYS_PARAM_SURV, &surv_state_param, 4,
fsp_surv_got_param, NULL);
if (rc) {
log_simple_error(&e_info(OPAL_RC_SURVE_INIT),
"SURV: Error %d queueing param request\n", rc);
}
}
static bool fsp_surv_msg_rr(u32 cmd_sub_mod, struct fsp_msg *msg)
{
assert(msg == NULL);
switch (cmd_sub_mod) {
case FSP_RESET_START:
printf("SURV: Disabling surveillance\n");
lock(&surv_lock);
fsp_surv_state = false;
fsp_surv_ack_pending = false;
unlock(&surv_lock);
return true;
case FSP_RELOAD_COMPLETE:
fsp_surv_query();
return true;
}
return false;
}
static struct fsp_client fsp_surv_client_rr = {
.message = fsp_surv_msg_rr,
};
/* This is called at boot time */
void fsp_init_surveillance(void)
{
/* Always register the poller, so we don't have to add/remove
* it on reset-reload or change of surveillance state. Also the
* poller list has no locking so we don't want to play with it
* at runtime.
*/
opal_add_poller(fsp_surv_poll, NULL);
/* Register for the reset/reload event */
fsp_register_client(&fsp_surv_client_rr, FSP_MCLASS_RR_EVENT);
/* Send query to FSP */
fsp_surv_query();
}
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