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

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Date:   Sun, 10 Sep 2023 22:59:27 -0700
From:   Can Guo <quic_cang@...cinc.com>
To:     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, Bart Van Assche <bvanassche@....org>,
        Bean Huo <beanhuo@...ron.com>, Lu Hongfei <luhongfei@...o.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 6/6] scsi: ufs: ufs-sysfs: Introduce UFS power info sysfs nodes

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.

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.
 
-- 
2.7.4