Re: [PATCH 3/3] dma-buf: Check status of enable-signaling bit on debug

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On 9/30/2022 12:02 AM, Christian König wrote:
Am 29.09.22 um 20:30 schrieb Yadav, Arvind:

On 9/29/2022 11:48 PM, Christian König wrote:
Am 27.09.22 um 19:24 schrieb Arvind Yadav:
Fence signaling must be enabled to make sure that
the dma_fence_is_signaled_locked() function ever returns true.
Since drivers and implementations sometimes mess this up,
this ensures correct behaviour when DMABUF_DEBUG_ENABLE_SIGNALING
is used during debugging.
This should make any implementation bugs resulting in not
signaled fences much more obvious.

Are all IGT tests now passing with this? That would be a bit unfortunate because it means we still have missed the bug in drm_syncobj.

IGT has these test cases related to syncobj (syncobj_basic, syncobj_timeline and syncobj_wait)and all are passing.

I will check syncobj and let you know.

Maybe CC the Intel list and let their CI systems take a look. That's usually rather valuable.

There is one IGT subtest is failing which is related to syncobj. I will fix this and submit the patch.

 igt_subtest("host-signal-points")
                test_host_signal_points(fd);


Thanks,
Christian.


~Arvind

Christian.


Signed-off-by: Arvind Yadav <Arvind.Yadav@xxxxxxx>
---
  include/linux/dma-fence.h | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 775cdc0b4f24..5156dc6be0a6 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -398,6 +398,11 @@ void dma_fence_enable_sw_signaling(struct dma_fence *fence);
  static inline bool
  dma_fence_is_signaled_locked(struct dma_fence *fence)
  {
+#ifdef CONFIG_DMABUF_DEBUG_ENABLE_SIGNALING
+    if (!test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT, &fence->flags))
+        return false;
+#endif
+
      if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags))
          return true;





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