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

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Message-ID: <8d95d169-452f-e426-938f-ccadf26de9ca@quicinc.com>
Date:   Thu, 14 Sep 2023 17:05:29 +0530
From:   Nitin Rawat <quic_nitirawa@...cinc.com>
To:     Can Guo <quic_cang@...cinc.com>, <mani@...nel.org>,
        <quic_nguyenb@...cinc.com>, <martin.petersen@...cle.com>
CC:     <linux-scsi@...r.kernel.org>, Bart Van Assche <bvanassche@....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 9/11/2023 11:29 AM, 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.

Please fix spelling mistake *bounch -> bunch
> 
> Signed-off-by: Can Guo <quic_cang@...cinc.com>
> ---
>   Documentation/ABI/testing/sysfs-driver-ufs | 48 ++++++++++++++++++++++++++----
>   1 file changed, 43 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/ABI/testing/sysfs-driver-ufs b/Documentation/ABI/testing/sysfs-driver-ufs
> index 0c7efaf..25169f2 100644
> --- a/Documentation/ABI/testing/sysfs-driver-ufs
> +++ b/Documentation/ABI/testing/sysfs-driver-ufs
> @@ -1214,12 +1214,50 @@ Description:	This file shows the average latency (in micro seconds) of write
>   
>   		The file is read only.
>   
> -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
> +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.
> +
> +What:		/sys/bus/platform/drivers/ufshcd/*/power_info/lane
> +What:		/sys/bus/platform/devices/*.ufs/power_info/lane
> +Date:		September 2023
> +Contact:	Can Guo <quic_cang@...cinc.com>
> +Description:	This file shows how many lanes are enabled on the UFS link.
> +
> +		The file is read only.
> +
> +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.
> +
> +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.
> +
> +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.
> +
> +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.
>   
>   		The file is read only.
>   

Thanks,
nitin