Am 14.09.22 um 18:43 schrieb Arvind Yadav:
Fence signaling must be enabled to make sure that
the dma_fence_is_signaled() 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.

Signed-off-by: Arvind Yadav <arvind.ya...@amd.com>

Reviewed-by: Christian König <christian.koe...@amd.com>

---

Changes in v1,v2 :
1- Addressing Christian's comment to replace
CONFIG_DEBUG_WW_MUTEX_SLOWPATH instead of CONFIG_DEBUG_FS.
2- As per Christian's comment moving this patch at last so
The version of this patch is also changed and previously
it was [PATCH 1/4]

Changes in v3:
1 - Adding new config DMABUF_DEBUG_ENABLE_SIGNALING.
2 - Replace CONFIG_DEBUG_WW_MUTEX_SLOWPATH to new
CONFIG_DMABUF_DEBUG_ENABLE_SIGNALING.

---
  drivers/dma-buf/Kconfig   | 7 +++++++
  include/linux/dma-fence.h | 5 +++++
  2 files changed, 12 insertions(+)

diff --git a/drivers/dma-buf/Kconfig b/drivers/dma-buf/Kconfig
index e4dc53a36428..c991e6a51510 100644
--- a/drivers/dma-buf/Kconfig
+++ b/drivers/dma-buf/Kconfig
@@ -65,6 +65,13 @@ config DMABUF_SELFTESTS
        default n
        depends on DMA_SHARED_BUFFER
+config DMABUF_DEBUG_ENABLE_SIGNALING
+       bool "DMA Fence enable signaling debug checks"
+       default n
+       depends on DMA_SHARED_BUFFER
+       help
+         This option enables additional checks for software signaling of fence.
+
  menuconfig DMABUF_HEAPS
        bool "DMA-BUF Userland Memory Heaps"
        select DMA_SHARED_BUFFER
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 775cdc0b4f24..01e1fa4d3cec 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -428,6 +428,11 @@ dma_fence_is_signaled_locked(struct dma_fence *fence)
  static inline bool
  dma_fence_is_signaled(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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