linux-kernel - Re: [PATCH 6/6] scsi: ufs: ufs-sysfs: Introduce UFS power info sysfs nodes

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Date:   Mon, 18 Sep 2023 08:36:21 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Can Guo <quic_cang@...cinc.com>, mani@...nel.org,
        quic_nguyenb@...cinc.com, quic_nitirawa@...cinc.com,
        martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, Bean Huo <beanhuo@...ron.com>,
        Lu Hongfei <luhongfei@...o.com>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] scsi: ufs: ufs-sysfs: Introduce UFS power info sysfs
 nodes

On 9/10/23 22:59, Can Guo wrote:
> Having UFS power info available in sysfs makes it easier to tell the state
> of the link during runtime considering we have a bounch of power saving
> features and various combinations for backward compatiblity.

bounch -> bunch
compatiblity -> compatibility

Additionally, please combine this patch with patch 5/6 into a single patch.

> -What:		/sys/bus/platform/drivers/ufshcd/*/monitor/write_req_latency_sum
> -What:		/sys/bus/platform/devices/*.ufs/monitor/write_req_latency_sum
> -Date:		January 2021

Has the above information perhaps been removed by accident?

> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/gear
> +What:		/sys/bus/platform/devices/*.ufs/power_info/gear
> +Date:		September 2023
>   Contact:	Can Guo <quic_cang@...cinc.com>
> -Description:	This file shows the total latency (in micro seconds) of write
> -		requests after monitor gets started.
> +Description:	This file shows the gear of UFS link.
> +
> +		The file is read only.

Please explain what "gear" means and also what the unit is of the 
numbers reported via this sysfs attribute.

> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/mode
> +What:		/sys/bus/platform/devices/*.ufs/power_info/mode
> +Date:		September 2023
> +Contact:	Can Guo <quic_cang@...cinc.com>
> +Description:	This file shows the power mode of UFS link.
> +
> +		The file is read only.

Please document the meaning of the numbers reported via this sysfs 
attribute.

> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/rate
> +What:		/sys/bus/platform/devices/*.ufs/power_info/rate
> +Date:		September 2023
> +Contact:	Can Guo <quic_cang@...cinc.com>
> +Description:	This file shows the high speed rate of UFS link.
> +
> +		The file is read only.

Please document the unit of the numbers reported via this sysfs attribute.

> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/dev_pm
> +What:		/sys/bus/platform/devices/*.ufs/power_info/dev_pm
> +Date:		September 2023
> +Contact:	Can Guo <quic_cang@...cinc.com>
> +Description:	This file shows the UFS device power mode, i.e., the power mode
> +		set to UFS device via the Start Stop Unit command.

Please document the meaning of the numbers reported through this sysfs 
attribute.

> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/link_state
> +What:		/sys/bus/platform/devices/*.ufs/power_info/link_state
> +Date:		September 2023
> +Contact:	Can Guo <quic_cang@...cinc.com>
> +Description:	This file shows the the state of the UFS link.

Please document the meaning of the numbers reported through this sysfs 
attribute.

Thanks,

Bart.