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qcacld-3.0: Add operation timeout detection to DSC

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In order to catch and debug long running or stuck operations, add a
watchdog timer to Driver Synchronization Core (DSC) operation start/stop
call pairs. If the timer expires, panic the driver for offline
debugging.

Change-Id: If93914178622b993fb09c7330fded2e9bc1c25d1
CRs-Fixed: 2328591
This commit is contained in:
Dustin Brown
2018-10-04 13:32:50 -07:00
committed by nshrivas
parent 88b4ea45c6
commit 39e01d0812
2 changed files with 27 additions and 0 deletions
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23
components/dsc/src/__wlan_dsc.c
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@@ -20,9 +20,18 @@
#include "qdf_mem.h"
#include "qdf_status.h"
#include "qdf_str.h"
#include "qdf_timer.h"
#include "__wlan_dsc.h"
#ifdef WLAN_DSC_DEBUG
static void __dsc_dbg_op_timeout(void *opaque_op)
{
struct dsc_op *op = opaque_op;
QDF_DEBUG_PANIC("Operation '%s' exceeded %ums",
op->func, DSC_OP_TIMEOUT_MS);
}
/**
* __dsc_dbg_ops_init() - initialize debug ops data structures
* @ops: the ops container to initialize
@@ -54,17 +63,29 @@ static inline void __dsc_dbg_ops_deinit(struct dsc_ops *ops)
*/
static QDF_STATUS __dsc_dbg_ops_insert(struct dsc_ops *ops, const char *func)
{
QDF_STATUS status;
struct dsc_op *op;
op = qdf_mem_malloc(sizeof(*op));
if (!op)
return QDF_STATUS_E_NOMEM;
status = qdf_timer_init(NULL, &op->timeout_timer, __dsc_dbg_op_timeout,
op, QDF_TIMER_TYPE_SW);
if (QDF_IS_STATUS_ERROR(status))
goto free_op;
op->func = func;
qdf_timer_start(&op->timeout_timer, DSC_OP_TIMEOUT_MS);
qdf_list_insert_back(&ops->list, &op->node);
return QDF_STATUS_SUCCESS;
free_op:
qdf_mem_free(op);
return status;
}
/**
@@ -86,6 +107,8 @@ static void __dsc_dbg_ops_remove(struct dsc_ops *ops, const char *func)
/* this is safe because we cease iteration */
qdf_list_remove_node(&ops->list, &op->node);
qdf_timer_stop(&op->timeout_timer);
qdf_timer_free(&op->timeout_timer);
qdf_mem_free(op);
return;