linux-kernel - Re: [PATCH 3/4] dma-buf: Add callback and enable signaling on debug

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Date:   Mon, 5 Sep 2022 13:26:50 +0200
From:   Christian König <christian.koenig@....com>
To:     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 3/4] dma-buf: Add callback and enable signaling on debug



Am 05.09.22 um 12:56 schrieb Arvind Yadav:
> Here's on debug adding an enable_signaling callback for the stub
> fences and enabling software signaling for the stub fence which
> is always signaled. This fence should enable software signaling
> otherwise the AMD GPU scheduler will cause a GPU reset due to a
> GPU scheduler cleanup activity timeout.
>
> Signed-off-by: Arvind Yadav <Arvind.Yadav@....com>
> ---
>   drivers/dma-buf/dma-fence.c | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
>
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 066400ed8841..0a67af945ef8 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -27,6 +27,10 @@ EXPORT_TRACEPOINT_SYMBOL(dma_fence_signaled);
>   static DEFINE_SPINLOCK(dma_fence_stub_lock);
>   static struct dma_fence dma_fence_stub;
>   
> +#ifdef CONFIG_DEBUG_FS
> +static bool __dma_fence_enable_signaling(struct dma_fence *fence);
> +#endif
> +
>   /*
>    * fence context counter: each execution context should have its own
>    * fence context, this allows checking if fences belong to the same
> @@ -116,9 +120,19 @@ static const char *dma_fence_stub_get_name(struct dma_fence *fence)
>           return "stub";
>   }
>   
> +#ifdef CONFIG_DEBUG_FS
> +static bool dma_fence_stub_enable_signaling(struct dma_fence *f)
> +{
> +	return true;
> +}
> +#endif

Again, adding the callback is unnecessary.

> +
>   static const struct dma_fence_ops dma_fence_stub_ops = {
>   	.get_driver_name = dma_fence_stub_get_name,
>   	.get_timeline_name = dma_fence_stub_get_name,
> +#ifdef CONFIG_DEBUG_FS
> +	.enable_signaling =  dma_fence_stub_enable_signaling,
> +#endif
>   };
>   
>   /**
> @@ -136,6 +150,9 @@ struct dma_fence *dma_fence_get_stub(void)
>   			       &dma_fence_stub_ops,
>   			       &dma_fence_stub_lock,
>   			       0, 0);
> +#ifdef CONFIG_DEBUG_FS
> +		__dma_fence_enable_signaling(&dma_fence_stub);
> +#endif
>   		dma_fence_signal_locked(&dma_fence_stub);
>   	}
>   	spin_unlock(&dma_fence_stub_lock);