linux-kernel - Re: [PATCH v6 10/10] vfio/fsl-mc: Add support for device reset

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Date:   Sat, 10 Oct 2020 19:50:37 +0200
From:   Auger Eric <eric.auger@...hat.com>
To:     Diana Craciun <diana.craciun@....nxp.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        kvm@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, bharatb.linux@...il.com,
        laurentiu.tudor@....com
Subject: Re: [PATCH v6 10/10] vfio/fsl-mc: Add support for device reset

Hi Diana,

On 10/5/20 7:36 PM, 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>
Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric
> ---
>  drivers/vfio/fsl-mc/vfio_fsl_mc.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/fsl-mc/vfio_fsl_mc.c b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> index d95568cd8021..d009f873578c 100644
> --- a/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> +++ b/drivers/vfio/fsl-mc/vfio_fsl_mc.c
> @@ -217,6 +217,10 @@ static long vfio_fsl_mc_ioctl(void *device_data, unsigned int cmd,
>  			return -EINVAL;
>  
>  		info.flags = VFIO_DEVICE_FLAGS_FSL_MC;
> +
> +		if (is_fsl_mc_bus_dprc(mc_dev))
> +			info.flags |= VFIO_DEVICE_FLAGS_RESET;
> +
>  		info.num_regions = mc_dev->obj_desc.region_count;
>  		info.num_irqs = mc_dev->obj_desc.irq_count;
>  
> @@ -299,7 +303,19 @@ 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;
>