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/* IBM_PROLOG_BEGIN_TAG */
/* This is an automatically generated prolog. */
/* */
/* $Source: src/usr/ipmiext/ipmiwatchdog.C $ */
/* */
/* OpenPOWER HostBoot Project */
/* */
/* Contributors Listed Below - COPYRIGHT 2014,2018 */
/* [+] Google Inc. */
/* [+] International Business Machines 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. */
/* */
/* IBM_PROLOG_END_TAG */
#ifndef __IPMIWATCHDOG_IPMIWATCHDOG_C
#define __IPMIWATCHDOG_IPMIWATCHDOG_C
/**
* @file ipmiwatchdog.C
*
* Ipmi watchdog timer
*
*/
/******************************************************************************/
// Includes
/******************************************************************************/
#include <stdint.h>
#include <errl/errlentry.H>
#include <ipmi/ipmiwatchdog.H>
#include <ipmi/ipmiif.H>
#include <sys/time.h>
#include <time.h>
/******************************************************************************/
// Globals/Constants
/******************************************************************************/
// Defined in ipmidd.C
extern trace_desc_t * g_trac_ipmi;
#define IPMI_TRAC(printf_string,args...) \
TRACFCOMP(g_trac_ipmi,"wd: " printf_string,##args)
namespace IPMIWATCHDOG
{
// Needed for watchdog resets in case the BMC side becomes uninitialized and we
// need to reinitialize it
static bool g_set_once = false;
static uint16_t g_countdown_secs;
static uint8_t g_timer_use;
static TIMER_ACTIONS g_timer_action;
static TIMER_USE_CLR_FLAGS g_timer_clr_flag;
/******************************************************************************/
// Functions
/******************************************************************************/
errlHndl_t setWatchDogTimer( const uint16_t i_countdown_secs,
const uint8_t i_timer_use,
const TIMER_ACTIONS i_timer_action,
const TIMER_USE_CLR_FLAGS i_timer_clr_flag)
{
// Save the latest values so that reset actions can setup the timer
// if the BMC goes away.
g_set_once = true;
g_countdown_secs = i_countdown_secs;
g_timer_use = i_timer_use;
g_timer_action = i_timer_action;
g_timer_clr_flag = i_timer_clr_flag;
// Convert secs into lsb and msb values
// the ipmi spec uses the count which is 100ms/count
static const uint16_t ms_per_count = 100;
static const uint8_t bits_to_shift_for_nxt_byte = 8;
static const uint8_t byte_mask = 0xFF;
uint16_t countdown = (i_countdown_secs * MS_PER_SEC)
/ ms_per_count;
uint8_t init_countdown_lsb = static_cast<uint8_t>
(countdown & byte_mask);
uint8_t init_countdown_msb = static_cast<uint8_t>(
(countdown >> bits_to_shift_for_nxt_byte)
& byte_mask);
size_t len = 6; // IPMI spec has request data at 6 bytes
//create request data buffer
uint8_t* data = new uint8_t[len];
data[0] = i_timer_use; // byte 1 timer use
data[1] = i_timer_action; // byte 2 timer actions
data[2] = 0x00; // byte 3 pre-interval timeout in secs
data[3] = i_timer_clr_flag; // byte 4 timer use flags to clear
data[4] = init_countdown_lsb; // byte 5 initial countdown timer LSByte
data[5] = init_countdown_msb; // byte 6 initial countdown timer MSByte
IPMI_TRAC( "setWatchDogTimer : sec=%d, use=%d, act=%d, clr=%d",
i_countdown_secs,
i_timer_use,
i_timer_action,
i_timer_clr_flag );
return IPMI::send(IPMI::set_watchdog(), len, data);
}
errlHndl_t resetWatchDogTimer()
{
errlHndl_t err_ipmi = NULL;
// Limit the amount of sent watchdog resets to once per second to make
// sure that we don't overload the BMC with resets during quickly
// completing ISTEPs. For simplicity we only compare the tv_sec so
// the grace period may be almost 2 seconds.
static uint64_t last_reset_sec;
timespec_t now;
clock_gettime(CLOCK_MONOTONIC, &now);
if (last_reset_sec + 1 >= now.tv_sec)
{
return NULL;
}
last_reset_sec = now.tv_sec;
// reset command does not take any request data
size_t len = 0;
uint8_t* data = NULL;
do
{
IPMI_TRAC( "resetWatchDogTimer" );
IPMI::completion_code cc;
err_ipmi = IPMI::sendrecv(IPMI::reset_watchdog(), cc, len, data);
delete[] data;
if(err_ipmi)
{
//got an error sending IPMI msg
//progate error upstream.
break;
}
// Make sure we don't have an uninitialized watchdog
// openbmc will always start the watchdog regardless of us
// initializing it. If we don't initialize it, it can eventually
// time out on us
if (g_set_once && cc == IPMI::CC_CMDSPC1)
{
err_ipmi = setWatchDogTimer(g_countdown_secs,
g_timer_use | DO_NOT_STOP,
g_timer_action, g_timer_clr_flag);
if (err_ipmi)
{
//got an error sending IPMI msg
//progate error upstream.
break;
}
// Make sure to issue a reset after initialization to start
// the timer if it isn't already. We don't care about the return
// value of this message since we can't recurse forever. If we
// fail here, later resets should handle reconfiguring the
// watchdog if it isn't critically broken.
len = 0;
data = NULL;
err_ipmi = IPMI::send(IPMI::reset_watchdog(), len, data);
if(err_ipmi)
{
//got an error sending IPMI msg
//progate error upstream.
break;
}
}
// We don't care about any other types of errors as the watchdog
// will just trip in these cases.
break;
}
while(0);
return err_ipmi;
}
} // namespace
#endif
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