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Date: Thu, 29 Sep 2022 20:32:08 +0200 From: Christian König <christian.koenig@....com> To: "Yadav, Arvind" <arvyadav@....com>, Arvind Yadav <Arvind.Yadav@....com>, andrey.grodzovsky@....com, shashank.sharma@....com, amaranath.somalapuram@....com, Arunpravin.PaneerSelvam@....com, sumit.semwal@...aro.org, gustavo@...ovan.org, airlied@...ux.ie, daniel@...ll.ch, linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org, linaro-mm-sig@...ts.linaro.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 3/3] dma-buf: Check status of enable-signaling bit on debug 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. Thanks, Christian. > > ~Arvind > >> Christian. >> >>> >>> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com> >>> --- >>> 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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