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#include <linux/sched.h>
#include <litmus/litmus.h>
#include <litmus/reservations/reservation.h>
#include <litmus/reservations/polling.h>
static void periodic_polling_client_arrives(
struct reservation* res,
struct reservation_client *client
)
{
struct polling_reservation *pres =
container_of(res, struct polling_reservation, res);
lt_t instances, tmp;
list_add_tail(&client->list, &res->clients);
switch (res->state) {
case RESERVATION_INACTIVE:
/* Figure out next replenishment time. */
tmp = res->env->current_time - res->env->time_zero;
instances = div64_u64(tmp, pres->period);
res->next_replenishment =
(instances + 1) * pres->period + pres->offset;
TRACE("pol-res: activate tmp=%llu instances=%llu period=%llu nextrp=%llu cur=%llu\n",
tmp, instances, pres->period, res->next_replenishment,
res->env->current_time);
res->env->change_state(res->env, res,
RESERVATION_DEPLETED);
break;
case RESERVATION_ACTIVE:
case RESERVATION_DEPLETED:
/* do nothing */
break;
case RESERVATION_ACTIVE_IDLE:
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
}
}
static void periodic_polling_client_departs(
struct reservation *res,
struct reservation_client *client,
int did_signal_job_completion
)
{
list_del(&client->list);
switch (res->state) {
case RESERVATION_INACTIVE:
case RESERVATION_ACTIVE_IDLE:
BUG(); /* INACTIVE or IDLE <=> no client */
break;
case RESERVATION_ACTIVE:
if (list_empty(&res->clients)) {
res->env->change_state(res->env, res,
RESERVATION_ACTIVE_IDLE);
} /* else: nothing to do, more clients ready */
break;
case RESERVATION_DEPLETED:
/* do nothing */
break;
}
}
static void periodic_polling_on_replenishment(
struct reservation *res
)
{
struct polling_reservation *pres =
container_of(res, struct polling_reservation, res);
/* replenish budget */
res->cur_budget = pres->max_budget;
res->next_replenishment += pres->period;
res->budget_consumed = 0;
switch (res->state) {
case RESERVATION_DEPLETED:
case RESERVATION_INACTIVE:
case RESERVATION_ACTIVE_IDLE:
if (list_empty(&res->clients))
/* no clients => poll again later */
res->env->change_state(res->env, res,
RESERVATION_INACTIVE);
else
/* we have clients & budget => ACTIVE */
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
case RESERVATION_ACTIVE:
/* Replenished while active => tardy? In any case,
* go ahead and stay active. */
break;
}
}
static void periodic_polling_on_replenishment_edf(
struct reservation *res
)
{
struct polling_reservation *pres =
container_of(res, struct polling_reservation, res);
/* update current priority */
res->priority = res->next_replenishment + pres->deadline;
/* do common updates */
periodic_polling_on_replenishment(res);
}
static struct reservation_ops periodic_polling_ops_fp = {
.dispatch_client = default_dispatch_client,
.client_arrives = periodic_polling_client_arrives,
.client_departs = periodic_polling_client_departs,
.replenish = periodic_polling_on_replenishment,
.drain_budget = common_drain_budget,
};
static struct reservation_ops periodic_polling_ops_edf = {
.dispatch_client = default_dispatch_client,
.client_arrives = periodic_polling_client_arrives,
.client_departs = periodic_polling_client_departs,
.replenish = periodic_polling_on_replenishment_edf,
.drain_budget = common_drain_budget,
};
static void sporadic_polling_client_arrives_fp(
struct reservation* res,
struct reservation_client *client
)
{
struct polling_reservation *pres =
container_of(res, struct polling_reservation, res);
list_add_tail(&client->list, &res->clients);
switch (res->state) {
case RESERVATION_INACTIVE:
/* Replenish now. */
res->cur_budget = pres->max_budget;
res->next_replenishment =
res->env->current_time + pres->period;
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
case RESERVATION_ACTIVE:
case RESERVATION_DEPLETED:
/* do nothing */
break;
case RESERVATION_ACTIVE_IDLE:
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
}
}
static void sporadic_polling_client_arrives_edf(
struct reservation* res,
struct reservation_client *client
)
{
struct polling_reservation *pres =
container_of(res, struct polling_reservation, res);
list_add_tail(&client->list, &res->clients);
switch (res->state) {
case RESERVATION_INACTIVE:
/* Replenish now. */
res->cur_budget = pres->max_budget;
res->next_replenishment =
res->env->current_time + pres->period;
res->priority =
res->env->current_time + pres->deadline;
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
case RESERVATION_ACTIVE:
case RESERVATION_DEPLETED:
/* do nothing */
break;
case RESERVATION_ACTIVE_IDLE:
res->env->change_state(res->env, res,
RESERVATION_ACTIVE);
break;
}
}
static struct reservation_ops sporadic_polling_ops_fp = {
.dispatch_client = default_dispatch_client,
.client_arrives = sporadic_polling_client_arrives_fp,
.client_departs = periodic_polling_client_departs,
.replenish = periodic_polling_on_replenishment,
.drain_budget = common_drain_budget,
};
static struct reservation_ops sporadic_polling_ops_edf = {
.dispatch_client = default_dispatch_client,
.client_arrives = sporadic_polling_client_arrives_edf,
.client_departs = periodic_polling_client_departs,
.replenish = periodic_polling_on_replenishment_edf,
.drain_budget = common_drain_budget,
};
void polling_reservation_init(
struct polling_reservation *pres,
int use_edf_prio,
int use_periodic_polling,
lt_t budget, lt_t period, lt_t deadline, lt_t offset
)
{
if (!deadline)
deadline = period;
BUG_ON(budget > period);
BUG_ON(budget > deadline);
BUG_ON(offset >= period);
reservation_init(&pres->res);
pres->max_budget = budget;
pres->period = period;
pres->deadline = deadline;
pres->offset = offset;
if (use_periodic_polling) {
pres->res.kind = PERIODIC_POLLING;
if (use_edf_prio)
pres->res.ops = &periodic_polling_ops_edf;
else
pres->res.ops = &periodic_polling_ops_fp;
} else {
pres->res.kind = SPORADIC_POLLING;
if (use_edf_prio)
pres->res.ops = &sporadic_polling_ops_edf;
else
pres->res.ops = &sporadic_polling_ops_fp;
}
}
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