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qcacmn: Add Scheduler Watchdog Timer

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In order to catch long running scheduler messages, start a watchdog
timer before processing each message, and stop the timer after each
message is processed. When the watchdog timer expires, immediately
crash the device in debug builds for easier debugging.

Change-Id: I4b43a9e12fc1f5b8a795fec790fe7548a100d9db
CRs-Fixed: 2037094
This commit is contained in:
Dustin Brown
2017-04-21 13:22:14 -07:00
committed by snandini
parent d6b243219d
commit e226cebdd2
6 changed files with 90 additions and 3 deletions
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36
scheduler/src/scheduler_api.c
View File

@@ -77,9 +77,39 @@ static QDF_STATUS scheduler_close(struct scheduler_ctx *sched_ctx)
/* Deinit all the queues */
scheduler_queues_deinit(sched_ctx);
qdf_timer_free(&sched_ctx->watchdog_timer);
return QDF_STATUS_SUCCESS;
}
static inline void scheduler_watchdog_notify(struct scheduler_ctx *sched)
{
char symbol[QDF_SYMBOL_LEN] = "<null>";
if (sched->watchdog_callback)
qdf_sprint_symbol(symbol, sched->watchdog_callback);
QDF_TRACE(QDF_MODULE_ID_SCHEDULER, QDF_TRACE_LEVEL_ERROR,
"%s: Callback %s (type 0x%x) has exceeded its allotted time of %ds",
__func__, symbol, sched->watchdog_msg_type,
SCHEDULER_WATCHDOG_TIMEOUT / 1000);
}
#ifdef CONFIG_SLUB_DEBUG_ON
static void scheduler_watchdog_bite(void *arg)
{
scheduler_watchdog_notify((struct scheduler_ctx *)arg);
QDF_TRACE(QDF_MODULE_ID_SCHEDULER, QDF_TRACE_LEVEL_ERROR,
"%s: Going down for Scheduler Watchdog Bite!", __func__);
QDF_BUG(0);
}
#else
static void scheduler_watchdog_bite(void *arg)
{
scheduler_watchdog_notify((struct scheduler_ctx *)arg);
}
#endif
static QDF_STATUS scheduler_open(struct scheduler_ctx *sched_ctx)
{
QDF_TRACE(QDF_MODULE_ID_SCHEDULER, QDF_TRACE_LEVEL_INFO_HIGH,
@@ -98,6 +128,12 @@ static QDF_STATUS scheduler_open(struct scheduler_ctx *sched_ctx)
qdf_spinlock_create(&sched_ctx->sch_thread_lock);
qdf_init_waitqueue_head(&sched_ctx->sch_wait_queue);
sched_ctx->sch_event_flag = 0;
qdf_timer_init(NULL,
&sched_ctx->watchdog_timer,
&scheduler_watchdog_bite,
sched_ctx,
QDF_TIMER_TYPE_SW);
/* Create the Scheduler Main Controller thread */
sched_ctx->sch_thread = qdf_create_thread(scheduler_thread,
sched_ctx, "scheduler_thread");

13
scheduler/src/scheduler_core.c
View File

@@ -283,7 +283,7 @@ static void scheduler_core_return_msg(struct scheduler_ctx *sch_ctx,
}
static void scheduler_thread_process_queues(struct scheduler_ctx *sch_ctx,
bool *shutdown)
bool *shutdown)
{
int i;
QDF_STATUS vStatus = QDF_STATUS_E_FAILURE;
@@ -331,9 +331,16 @@ static void scheduler_thread_process_queues(struct scheduler_ctx *sch_ctx,
return;
}
if (sch_ctx->queue_ctx.scheduler_msg_process_fn[i]) {
struct scheduler_msg *msg = pMsgWrapper->msg_buf;
sch_ctx->watchdog_msg_type = msg->type;
sch_ctx->watchdog_callback = msg->callback;
qdf_timer_start(&sch_ctx->watchdog_timer,
SCHEDULER_WATCHDOG_TIMEOUT);
vStatus = sch_ctx->queue_ctx.
scheduler_msg_process_fn[i](
pMsgWrapper->msg_buf);
scheduler_msg_process_fn[i](msg);
qdf_timer_stop(&sch_ctx->watchdog_timer);
if (QDF_IS_STATUS_ERROR(vStatus)) {
QDF_TRACE(QDF_MODULE_ID_SCHEDULER,
QDF_TRACE_LEVEL_ERROR,