linux-kernel - Re: [PATCH v3 4/4] bus: fsl-mc: add bus rescan attribute

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Date:   Fri, 23 Mar 2018 16:49:53 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Ioana Ciornei <ioana.ciornei@....com>
Cc:     laurentiu.tudor@....com, linux-kernel@...r.kernel.org,
        stuyoder@...il.com, ruxandra.radulescu@....com, arnd@...db.de,
        razvan.stefanescu@....com, Roy.Pledge@....com
Subject: Re: [PATCH v3 4/4] bus: fsl-mc: add bus rescan attribute

On Fri, Mar 23, 2018 at 10:38:58AM -0500, Ioana Ciornei wrote:
> Introduce the rescan attribute as a bus attribute to
> synchronize the fsl-mc bus objects and the MC firmware.
> 
> To rescan the fsl-mc bus, e.g.,
> echo 1 > /sys/bus/fsl-mc/rescan
> 
> Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
> ---
> Changes in v2:
>   - added proper documentation in /Documentation/ABI/
>   - updated the MAINTAINERS file
> Changes in v3:
>   - no change
> 
>  Documentation/ABI/stable/sysfs-bus-fsl-mc |  7 +++++
>  drivers/bus/fsl-mc/fsl-mc-bus.c           | 48 +++++++++++++++++++++++++++++++
>  2 files changed, 55 insertions(+)
> 
> diff --git a/Documentation/ABI/stable/sysfs-bus-fsl-mc b/Documentation/ABI/stable/sysfs-bus-fsl-mc
> index e530e8c..0663fbd 100644
> --- a/Documentation/ABI/stable/sysfs-bus-fsl-mc
> +++ b/Documentation/ABI/stable/sysfs-bus-fsl-mc
> @@ -4,3 +4,10 @@ KernelVersion:	4.16
>  Contact:	Ioana Ciornei <ioana.ciornei@....com>
>  Description:	Root dprc rescan attribute
>  Users:		Userspace drivers and management tools
> +
> +What:		/sys/bus/fsl-mc/rescan
> +Date:		March. 2018
> +KernelVersion:	4.16

Same comments as previous review.

> +Contact:	Ioana Ciornei <ioana.ciornei@....com>
> +Description:	Bus rescan attribute

Again, describe this better please.

> +Users:		Userspace drivers and management tools
> diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
> index 9d02984..80010d1 100644
> --- a/drivers/bus/fsl-mc/fsl-mc-bus.c
> +++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
> @@ -172,11 +172,59 @@ static ssize_t rescan_store(struct device *dev,
>  
>  ATTRIBUTE_GROUPS(fsl_mc_dev);
>  
> +static int scan_fsl_mc_bus(struct device *dev, void *data)
> +{
> +	struct fsl_mc_device *root_mc_dev;
> +	struct fsl_mc_bus *root_mc_bus;
> +
> +	if (!fsl_mc_is_root_dprc(dev))
> +		goto exit;
> +
> +	root_mc_dev = to_fsl_mc_device(dev);
> +	root_mc_bus = to_fsl_mc_bus(root_mc_dev);
> +	mutex_lock(&root_mc_bus->scan_mutex);
> +	dprc_scan_objects(root_mc_dev, NULL);
> +	mutex_unlock(&root_mc_bus->scan_mutex);
> +
> +exit:
> +	return 0;
> +}
> +
> +static ssize_t bus_rescan_store(struct bus_type *bus,
> +				const char *buf, size_t count)
> +{
> +	unsigned long val;
> +
> +	if (kstrtoul(buf, 0, &val) < 0)
> +		return -EINVAL;
> +
> +	if (val)
> +		bus_for_each_dev(bus, NULL, NULL, scan_fsl_mc_bus);
> +
> +	return count;
> +}
> +static BUS_ATTR(rescan, 0220, NULL, bus_rescan_store);

BUS_ATTR_RO()?



> +
> +static struct attribute *fsl_mc_bus_attrs[] = {
> +	&bus_attr_rescan.attr,
> +	NULL,
> +};
> +
> +static const struct attribute_group fsl_mc_bus_group = {
> +	.attrs = fsl_mc_bus_attrs,
> +};
> +
> +static const struct attribute_group *fsl_mc_bus_groups[] = {
> +	&fsl_mc_bus_group,
> +	NULL,
> +};

ATTRIBUTE_GROUPS()?

thanks,

greg k-h