linux-kernel - Re: [PATCH v5 10/10] vfio/fsl-mc: Add support for device reset

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Date:   Fri, 2 Oct 2020 14:50:27 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Diana Craciun <diana.craciun@....nxp.com>
Cc:     kvm@...r.kernel.org, bharatb.linux@...il.com,
        linux-kernel@...r.kernel.org, eric.auger@...hat.com
Subject: Re: [PATCH v5 10/10] vfio/fsl-mc: Add support for device reset

On Tue, 29 Sep 2020 12:03:39 +0300
Diana Craciun <diana.craciun@....nxp.com> 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 | 14 +++++++++++++-
>  1 file changed, 13 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> index 0aff99cdf722..e1b2dea8a5fe 100644
> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> @@ -299,7 +299,19 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
>  	}
>  	case VFIO_DEVICE_RESET:
>  	{
> -		return -ENOTTY;
> +		int ret;
> +		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;
> +
> +		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;

This should also result in setting the VFIO_DEVICE_FLAGS_RESET bit in
vfio_device_info.flags for the appropriate devices.  Thanks,

Alex