Make dept able to track dependencies by dma fence waits and signals.

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 drivers/dma-buf/dma-fence.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index b4f5c8635276..b313bb59dc9c 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -16,6 +16,7 @@
 #include <linux/dma-fence.h>
 #include <linux/sched/signal.h>
 #include <linux/seq_file.h>
+#include <linux/dept_sdt.h>
 
 #define CREATE_TRACE_POINTS
 #include <trace/events/dma_fence.h>
@@ -798,6 +799,7 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout)
 	cb.task = current;
 	list_add(&cb.base.node, &fence->cb_list);
 
+	sdt_might_sleep_start(NULL);
 	while (!test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags) && ret > 0) {
 		if (intr)
 			__set_current_state(TASK_INTERRUPTIBLE);
@@ -811,6 +813,7 @@ dma_fence_default_wait(struct dma_fence *fence, bool intr, signed long timeout)
 		if (ret > 0 && intr && signal_pending(current))
 			ret = -ERESTARTSYS;
 	}
+	sdt_might_sleep_end();
 
 	if (!list_empty(&cb.base.node))
 		list_del(&cb.base.node);
@@ -900,6 +903,7 @@ dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,
 		}
 	}
 
+	sdt_might_sleep_start(NULL);
 	while (ret > 0) {
 		if (intr)
 			set_current_state(TASK_INTERRUPTIBLE);
@@ -914,6 +918,7 @@ dma_fence_wait_any_timeout(struct dma_fence **fences, uint32_t count,
 		if (ret > 0 && intr && signal_pending(current))
 			ret = -ERESTARTSYS;
 	}
+	sdt_might_sleep_end();
 
 	__set_current_state(TASK_RUNNING);
 
-- 
2.17.1