linux-kernel - Re: [PATCH v3] remoteproc: core: Auto select rproc-virtio device id

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Date:   Tue, 18 Oct 2022 09:18:18 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Shengjiu Wang <shengjiu.wang@....com>
Cc:     andersson@...nel.org, arnaud.pouliquen@...s.st.com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        shengjiu.wang@...il.com
Subject: Re: [PATCH v3] remoteproc: core: Auto select rproc-virtio device id

On Tue, 18 Oct 2022 at 08:04, Shengjiu Wang <shengjiu.wang@....com> wrote:
>
> With multiple remoteproc device, there will below error:
>
> sysfs: cannot create duplicate filename '/bus/platform/devices/rproc-virtio.0'
>
> The rvdev_data.index is duplicate, that cause issue, so
> need to use the PLATFORM_DEVID_AUTO instead. After fixing
> device name it becomes something like:
> /bus/platform/devices/rproc-virtio.2.auto
>
> Fixes: 1d7b61c06dc3 ("remoteproc: virtio: Create platform device for the remoteproc_virtio")
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>
> Reviewed-by: Mukesh Ojha <quic_mojha@...cinc.com>
> Tested-by: Peng Fan <peng.fan@....com>

I will queue this on Monday when rc2 comes out.

Thanks,
Mathieu

> ---
> changes in v3:
> - add comment in codec
>
> changes in v2:
> - update commit message
>
>  drivers/remoteproc/remoteproc_core.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 8768cb64f560..f9187e35b090 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -509,7 +509,13 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
>         rvdev_data.rsc_offset = offset;
>         rvdev_data.rsc = rsc;
>
> -       pdev = platform_device_register_data(dev, "rproc-virtio", rvdev_data.index, &rvdev_data,
> +       /*
> +        * When there is more than one remote processor, rproc->nb_vdev number is
> +        * same for each separate instances of "rproc". If rvdev_data.index is used
> +        * as device id, then we get dupliation in sysfs, so need to use
> +        * PLATFORM_DEVID_AUTO to auto select device id.
> +        */
> +       pdev = platform_device_register_data(dev, "rproc-virtio", PLATFORM_DEVID_AUTO, &rvdev_data,
>                                              sizeof(rvdev_data));
>         if (IS_ERR(pdev)) {
>                 dev_err(dev, "failed to create rproc-virtio device\n");
> --
> 2.34.1
>