linux-kernel - Re: [PATCH V3] remoteproc: virtio: Fix wdg cannot recovery remote processor

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Message-ID: <ZZ7miRHTe2LJ2PAh@p14s>
Date: Wed, 10 Jan 2024 11:48:41 -0700
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: joakim.zhang@...tech.com
Cc: andersson@...nel.org, arnaud.pouliquen@...s.st.com,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	cix-kernel-upstream@...tech.com
Subject: Re: [PATCH V3] remoteproc: virtio: Fix wdg cannot recovery remote
 processor

Good day Joakim,

On Sun, Dec 17, 2023 at 01:36:59PM +0800, joakim.zhang@...tech.com wrote:
> From: Joakim Zhang <joakim.zhang@...tech.com>
> 
> Recovery remote processor failed when wdg irq received:
> [    0.842574] remoteproc remoteproc0: crash detected in cix-dsp-rproc: type watchdog
> [    0.842750] remoteproc remoteproc0: handling crash #1 in cix-dsp-rproc
> [    0.842824] remoteproc remoteproc0: recovering cix-dsp-rproc
> [    0.843342] remoteproc remoteproc0: stopped remote processor cix-dsp-rproc
> [    0.847901] rproc-virtio rproc-virtio.0.auto: Failed to associate buffer
> [    0.847979] remoteproc remoteproc0: failed to probe subdevices for cix-dsp-rproc: -16
> 
> The reason is that dma coherent mem would not be released when
> recovering the remote processor, due to rproc_virtio_remove()
> would not be called, where the mem released. It will fail when
> it try to allocate and associate buffer again.
> 
> Releasing reserved memory from rproc_virtio_dev_release(), instead of
> rproc_virtio_remove().
> 
> Fixes: 1d7b61c06dc3 ("remoteproc: virtio: Create platform device for the remoteproc_virtio")
> Signed-off-by: Joakim Zhang <joakim.zhang@...tech.com>

I am in agreement with your patch.  I will apply it when 6.8-rc1 comes out.

Thanks,
Mathieu

> ---
> ChangeLogs:
> V1->V2:
> 	* the same for of_reserved_mem_device_release()
> V2->V3:
> 	* release reserved memory in rproc_virtio_dev_release()
> ---
>  drivers/remoteproc/remoteproc_virtio.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
> index 83d76915a6ad..25b66b113b69 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -351,6 +351,9 @@ static void rproc_virtio_dev_release(struct device *dev)
>  
>  	kfree(vdev);
>  
> +	of_reserved_mem_device_release(&rvdev->pdev->dev);
> +	dma_release_coherent_memory(&rvdev->pdev->dev);
> +
>  	put_device(&rvdev->pdev->dev);
>  }
>  
> @@ -584,9 +587,6 @@ static void rproc_virtio_remove(struct platform_device *pdev)
>  	rproc_remove_subdev(rproc, &rvdev->subdev);
>  	rproc_remove_rvdev(rvdev);
>  
> -	of_reserved_mem_device_release(&pdev->dev);
> -	dma_release_coherent_memory(&pdev->dev);
> -
>  	put_device(&rproc->dev);
>  }
>  
> -- 
> 2.25.1
>