Hello Joakim,
On 12/15/23 15:50, joakim.zh...@cixtech.com wrote:
> From: Joakim Zhang <joakim.zh...@cixtech.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.
>
> We can see that dma coherent mem allocated from rproc_add_virtio_dev(),
> so should release it from rproc_remove_virtio_dev(). These functions should
> appear symmetrically:
> -rproc_vdev_do_start()->rproc_add_virtio_dev()->dma_declare_coherent_memory()
> -rproc_vdev_do_stop()->rproc_remove_virtio_dev()->dma_release_coherent_memory()
>
> The same for of_reserved_mem_device_init_by_idx() and
> of_reserved_mem_device_release().
>
> Fixes: 1d7b61c06dc3 ("remoteproc: virtio: Create platform device for the
> remoteproc_virtio")
> Signed-off-by: Joakim Zhang <joakim.zh...@cixtech.com>
> ---
> ChangeLogs:
> V1->V2:
> * the same for of_reserved_mem_device_release()
> ---
> drivers/remoteproc/remoteproc_virtio.c | 7 ++++---
> 1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/remoteproc/remoteproc_virtio.c
> b/drivers/remoteproc/remoteproc_virtio.c
> index 83d76915a6ad..e877ee78740d 100644
> --- a/drivers/remoteproc/remoteproc_virtio.c
> +++ b/drivers/remoteproc/remoteproc_virtio.c
> @@ -465,8 +465,12 @@ static int rproc_add_virtio_dev(struct rproc_vdev
> *rvdev, int id)
> static int rproc_remove_virtio_dev(struct device *dev, void *data)
> {
> struct virtio_device *vdev = dev_to_virtio(dev);
> + struct rproc_vdev *rvdev = vdev_to_rvdev(vdev);
>
> unregister_virtio_device(vdev);
> + of_reserved_mem_device_release(&rvdev->pdev->dev);
> + dma_release_coherent_memory(&rvdev->pdev->dev);
> +
At this step, the virtio device may not be released and may still be using the
memory.
Do you try to move this in rproc_virtio_dev_release?
Regards,
Arnaud
> return 0;
> }
>
> @@ -584,9 +588,6 @@ 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
>
>
>
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