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

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Hi Bart,

On 9/18/2023 11:36 PM, Bart Van Assche wrote:
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.

Sure


-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?
Yes, my bad, good catch.

+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@xxxxxxxxxxx>
-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.
Sure

+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@xxxxxxxxxxx>
+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.
Sure

+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@xxxxxxxxxxx>
+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.
Sure

+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@xxxxxxxxxxx>
+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.
Sure

+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@xxxxxxxxxxx>
+Description:    This file shows the the state of the UFS link.

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

Sure


Thanks,

Can Guo.


Thanks,

Bart.



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