[PATCH] drm/amdgpu: replace BUG_ON() and BUG()

[jimqu]

Sometimes, it maybe a ring test failure during S3 resume. When that
happens, it will be kernel panic in the fence interrupt and  will
hangs up system. it is difficult to get any information from kernel
for debug.

Change-Id: Iafa6c3793be151b8b85cf4299b929ba333b6174e
Signed-off-by: JimQu <Jim.Qu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h       | 15 +++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c |  4 ++--
 2 files changed, 17 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index c3bf33f..15b6c5d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -2242,6 +2242,21 @@ amdgpu_get_sdma_instance(struct amdgpu_ring *ring)
 }
 
 /*
+ * Debug helpers
+ */
+#define AMDGPU_BUG() do { \
+		printk(KERN_ERR "BUG: failure at %s:%d/%s()!\n", __FILE__, __LINE__, __FUNCTION__); \
+		dump_stack(); \
+		for (;;); \
+	} while (0)
+
+#define AMDGPU_BUG_ON(condition) do { \
+		if (unlikely((condition)!= 0)) { \
+			AMDGPU_BUG(); \
+		} \
+	} while (0)
+
+/*
  * ASICs macro.
  */
 #define amdgpu_asic_set_vga_state(adev, state) (adev)->asic_funcs->set_vga_state((adev), (state))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
index d155876..b8e5fa7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -213,13 +213,13 @@ void amdgpu_fence_process(struct amdgpu_ring *ring)
 		fence = rcu_dereference_protected(*ptr, 1);
 		RCU_INIT_POINTER(*ptr, NULL);
 
-		BUG_ON(!fence);
+		AMDGPU_BUG_ON(!fence);
 
 		r = fence_signal(fence);
 		if (!r)
 			FENCE_TRACE(fence, "signaled from irq context\n");
 		else
-			BUG();
+			AMDGPU_BUG();
 
 		fence_put(fence);
 	}
-- 
1.9.1