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* [PATCH 1/2] dma-fence: export dma_fence_might_wait
@ 2021-07-06  9:05 ` Matthew Auld
  0 siblings, 0 replies; 15+ messages in thread
From: Matthew Auld @ 2021-07-06  9:05 UTC (permalink / raw)
  To: intel-gfx; +Cc: Daniel Vetter, dri-devel, Thomas Hellström

It might be useful for drivers to annotate a path where hitting the
actual wait path might be difficult or unlikely through normal testing.

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
---
 drivers/dma-buf/dma-fence.c | 19 ++++++++++++++++---
 include/linux/dma-fence.h   |  2 ++
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
index ce0f5eff575d..f2cd036b5243 100644
--- a/drivers/dma-buf/dma-fence.c
+++ b/drivers/dma-buf/dma-fence.c
@@ -335,6 +335,21 @@ void __dma_fence_might_wait(void)
 }
 #endif
 
+/**
+ * dma_fence_might_wait - entering a section which might wait on DMA fence
+ * critical section.
+ *
+ * This is also potentially useful for drivers to call directly, when annotating
+ * a path where hitting the actual wait path might be difficult or unlikely
+ * through normal testing.
+ */
+void dma_fence_might_wait(void)
+{
+	might_sleep();
+	__dma_fence_might_wait();
+}
+EXPORT_SYMBOL(dma_fence_might_wait);
+
 
 /**
  * dma_fence_signal_timestamp_locked - signal completion of a fence
@@ -495,9 +510,7 @@ dma_fence_wait_timeout(struct dma_fence *fence, bool intr, signed long timeout)
 	if (WARN_ON(timeout < 0))
 		return -EINVAL;
 
-	might_sleep();
-
-	__dma_fence_might_wait();
+	dma_fence_might_wait();
 
 	trace_dma_fence_wait_start(fence);
 	if (fence->ops->wait)
diff --git a/include/linux/dma-fence.h b/include/linux/dma-fence.h
index 6ffb4b2c6371..37bf4beed93f 100644
--- a/include/linux/dma-fence.h
+++ b/include/linux/dma-fence.h
@@ -370,6 +370,8 @@ static inline void dma_fence_end_signalling(bool cookie) {}
 static inline void __dma_fence_might_wait(void) {}
 #endif
 
+void dma_fence_might_wait(void);
+
 int dma_fence_signal(struct dma_fence *fence);
 int dma_fence_signal_locked(struct dma_fence *fence);
 int dma_fence_signal_timestamp(struct dma_fence *fence, ktime_t timestamp);
-- 
2.26.3


^ permalink raw reply related	[flat|nested] 15+ messages in thread

end of thread, other threads:[~2021-07-06 15:56 UTC | newest]

Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-07-06  9:05 [PATCH 1/2] dma-fence: export dma_fence_might_wait Matthew Auld
2021-07-06  9:05 ` [Intel-gfx] " Matthew Auld
2021-07-06  9:05 ` [PATCH 2/2] drm/i915: prefer dma_fence_might_wait in wait_migration Matthew Auld
2021-07-06  9:05   ` [Intel-gfx] " Matthew Auld
2021-07-06  9:14   ` Daniel Vetter
2021-07-06  9:14     ` [Intel-gfx] " Daniel Vetter
2021-07-06  9:14 ` [PATCH 1/2] dma-fence: export dma_fence_might_wait Daniel Vetter
2021-07-06  9:14   ` [Intel-gfx] " Daniel Vetter
2021-07-06  9:15   ` Daniel Vetter
2021-07-06  9:15     ` [Intel-gfx] " Daniel Vetter
2021-07-06  9:34 ` [Intel-gfx] ✗ Fi.CI.SPARSE: warning for series starting with [1/2] " Patchwork
2021-07-06 10:03 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2021-07-06 14:11 ` [Intel-gfx] ✗ Fi.CI.SPARSE: warning for series starting with [1/2] dma-fence: export dma_fence_might_wait (rev2) Patchwork
2021-07-06 14:39 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2021-07-06 15:56 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork

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