linux-kernel - Re: [PATCH v2 03/12] bus/fsl-mc: add support for 'driver

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Message-ID: <20200507133410.GN208718@lunn.ch>
Date:   Thu, 7 May 2020 15:34:10 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Diana Craciun <diana.craciun@....nxp.com>
Cc:     linux-kernel@...r.kernel.org, stuyoder@...il.com,
        gregkh@...uxfoundation.org, leoyang.li@....com,
        Bharat Bhushan <Bharat.Bhushan@....com>,
        linux-arm-kernel@...ts.infradead.org, laurentiu.tudor@....com
Subject: Re: [PATCH v2 03/12] bus/fsl-mc: add support for 'driver_override'
 in the mc-bus

On Thu, May 07, 2020 at 10:34:22AM +0300, Diana Craciun wrote:
> From: Bharat Bhushan <Bharat.Bhushan@....com>
> 
> This patch is required for vfio-fsl-mc meta driver to successfully bind
> layerscape container devices for device passthrough. This patch adds
> a mechanism to allow a layerscape device to specify a driver rather than
> a layerscape driver provide a device match.
> 
> Example to allow a device (dprc.1) to specifically bind
> with driver (vfio-fsl-mc):
>  - echo vfio-fsl-mc > /sys/bus/fsl-mc/devices/dprc.1/driver_override
>  - echo dprc.1 > /sys/bus/fsl-mc/drivers/fsl_mc_dprc/unbind
>  - echo dprc.1 > /sys/bus/fsl-mc/drivers/vfio-fsl-mc/bind

Hi Bharat, Diana

grep -r "/driver_override" Documentation 
Documentation/ABI/testing/sysfs-bus-rpmsg:What:		/sys/bus/rpmsg/devices/.../driver_override
Documentation/ABI/testing/sysfs-bus-pci:What:		/sys/bus/pci/devices/.../driver_override
Documentation/ABI/testing/sysfs-bus-platform:What:		/sys/bus/platform/devices/.../driver_override
Documentation/ABI/testing/sysfs-bus-css:What:		/sys/bus/css/devices/.../driver_override
Documentation/ABI/testing/sysfs-bus-vmbus:What:		/sys/bus/vmbus/devices/.../driver_override
Documentation/ABI/testing/sysfs-bus-amba:What:		/sys/bus/amba/devices/.../driver_override

Maybe it is time to move this into the core, and avoid yet another
implementation of driver_override_store() and driver_override_show()
functions etc.

   Andrew