linux-kernel - Re: [PATCH v4 10/10] vfio/fsl-mc: Add support for device reset

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Message-ID: <629498a6-8329-1045-c1a4-ab334f3c8107@redhat.com>
Date:   Fri, 4 Sep 2020 10:21:29 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Diana Craciun <diana.craciun@....nxp.com>,
        alex.williamson@...hat.com, kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bharatb.linux@...il.com,
        laurentiu.tudor@....com
Subject: Re: [PATCH v4 10/10] vfio/fsl-mc: Add support for device reset

Hi Diana,

On 8/26/20 11:33 AM, Diana Craciun wrote:
> Currently only resetting the DPRC container is supported which
> will reset all the objects inside it. Resetting individual
> objects is possible from the userspace by issueing commands
> towards MC firmware.
> 
> Signed-off-by: Diana Craciun <diana.craciun@....nxp.com>
> ---
>  drivers/vfio/fsl-mc/vfio_fsl_mc.c | 15 ++++++++++++++-
>  1 file changed, 14 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> index 27713aa86878..d17c5b3148ad 100644
> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> @@ -310,7 +310,20 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
>  	}
>  	case VFIO_DEVICE_RESET:
>  	{
> -		return -ENOTTY;
> +		int ret = 0;
initialization not needed
> +
spare empty line
> +		struct fsl_mc_device *mc_dev = vdev->mc_dev;
> +
> +		/* reset is supported only for the DPRC */
> +		if (!is_fsl_mc_bus_dprc(mc_dev))
> +			return -ENOTTY;
it is an error case or do we just don't care?
> +
> +		ret = dprc_reset_container(mc_dev->mc_io, 0,
> +					   mc_dev->mc_handle,
> +					   mc_dev->obj_desc.id,
> +					   DPRC_RESET_OPTION_NON_RECURSIVE);
> +		return ret;
> +
>  	}
>  	default:
>  		return -ENOTTY;
> 
Thanks

Eric