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/* BTS shutdown FSM */
/* (C) 2020 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
* Author: Pau Espin Pedrol <pespin@sysmocom.de>
*
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <osmocom/core/fsm.h>
#include <osmocom/core/tdef.h>
#include <osmo-bts/bts_shutdown_fsm.h>
#include <osmo-bts/logging.h>
#include <osmo-bts/gsm_data.h>
#include <osmo-bts/bts_model.h>
#define X(s) (1 << (s))
static const struct osmo_tdef_state_timeout bts_shutdown_fsm_timeouts[32] = {
[BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL] = { .T = -1 },
[BTS_SHUTDOWN_ST_EXIT] = { .T = -2 },
};
#define bts_shutdown_fsm_state_chg(fi, NEXT_STATE) \
osmo_tdef_fsm_inst_state_chg(fi, NEXT_STATE, bts_shutdown_fsm_timeouts, ((struct gsm_bts *)fi->priv)->T_defs, -1)
static void st_none(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
switch(event) {
case BTS_SHUTDOWN_EV_START:
bts_shutdown_fsm_state_chg(fi, BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL);
break;
}
}
static void st_wait_ramp_down_compl_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
/* TODO: here power ramp down will be started on all TRX, prior to changing state */
}
static void st_wait_ramp_down_compl(struct osmo_fsm_inst *fi, uint32_t event, void *data)
{
/* TODO: In here once we have ramp down implemented we'll transit to
regular exit. For now we simply wait for state timeout
bts_shutdown_fsm_state_chg(fi, BTS_SHUTDOWN_ST_EXIT);
*/
}
static void st_exit_on_enter(struct osmo_fsm_inst *fi, uint32_t prev_state)
{
struct gsm_bts *bts = (struct gsm_bts *)fi->priv;
struct gsm_bts_trx *trx;
llist_for_each_entry_reverse(trx, &bts->trx_list, list) {
bts_model_trx_deact_rf(trx);
bts_model_trx_close(trx);
}
/* There's yet no way to get confirmation from lower layers regarding
state. Allow a few seconds of select() loop and timeout timer will
exit later */
}
static struct osmo_fsm_state bts_shutdown_fsm_states[] = {
[BTS_SHUTDOWN_ST_NONE] = {
.in_event_mask =
X(BTS_SHUTDOWN_EV_START),
.out_state_mask = X(BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL),
.name = "NONE",
.action = st_none,
},
[BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL] = {
.in_event_mask = 0,
.out_state_mask =
X(BTS_SHUTDOWN_ST_EXIT),
.name = "WAIT_RAMP_DOWN_COMPL",
.onenter = st_wait_ramp_down_compl_on_enter,
.action = st_wait_ramp_down_compl,
},
[BTS_SHUTDOWN_ST_EXIT] = {
.name = "EXIT",
.onenter = st_exit_on_enter,
}
};
const struct value_string bts_shutdown_fsm_event_names[] = {
OSMO_VALUE_STRING(BTS_SHUTDOWN_EV_START),
{ 0, NULL }
};
int bts_shutdown_fsm_timer_cb(struct osmo_fsm_inst *fi)
{
switch (fi->state) {
case BTS_SHUTDOWN_ST_WAIT_RAMP_DOWN_COMPL:
LOGPFSML(fi, LOGL_ERROR, "Timer expired waiting for ramp down complete\n");
bts_shutdown_fsm_state_chg(fi, BTS_SHUTDOWN_ST_EXIT);
break;
case BTS_SHUTDOWN_ST_EXIT:
LOGPFSML(fi, LOGL_NOTICE, "Shutdown process completed successfuly, exiting process\n");
exit(0);
break;
default:
OSMO_ASSERT(false);
}
return 0;
}
struct osmo_fsm bts_shutdown_fsm = {
.name = "BTS_SHUTDOWN",
.states = bts_shutdown_fsm_states,
.num_states = ARRAY_SIZE(bts_shutdown_fsm_states),
.event_names = bts_shutdown_fsm_event_names,
.log_subsys = DOML,
.timer_cb = bts_shutdown_fsm_timer_cb,
};
static __attribute__((constructor)) void bts_shutdown_fsm_init(void)
{
OSMO_ASSERT(osmo_fsm_register(&bts_shutdown_fsm) == 0);
}
void bts_shutdown(struct gsm_bts *bts, const char *reason)
{
struct osmo_fsm_inst *fi = bts->shutdown_fi;
if (fi->state != BTS_SHUTDOWN_ST_NONE) {
LOGPFSML(fi, LOGL_NOTICE, "BTS is already being shutdown.\n");
return;
}
LOGPFSML(fi, LOGL_NOTICE, "Shutting down BTS, reason: %s\n", reason);
osmo_fsm_inst_dispatch(fi, BTS_SHUTDOWN_EV_START, NULL);
}
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