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scsi: ufs: docs: Add WriteBooster documentation

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Adds sysfs documentation for WriteBooster entries.

Link: https://lore.kernel.org/r/1591723067-22998-1-git-send-email-asutoshd@codeaurora.org
Acked-by: Avri Altman <avri.altman@wdc.com>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Asutosh Das 2020-06-09 10:17:46 -07:00 committed by Martin K. Petersen
parent 4c7b4d6327
commit f51853fc06
1 changed files with 136 additions and 0 deletions
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136
Documentation/ABI/testing/sysfs-driver-ufs
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@ -883,3 +883,139 @@ Contact: Subhash Jadavani <subhashj@codeaurora.org>
Description: This entry shows the target state of an UFS UIC link
for the chosen system power management level.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/wb_presv_us_en
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows if preserve user-space was configured
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/wb_shared_alloc_units
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the shared allocated units of WB buffer
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/wb_type
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the configured WB type.
0x1 for shared buffer mode. 0x0 for dedicated buffer mode.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/wb_buff_cap_adj
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the total user-space decrease in shared
buffer mode.
The value of this parameter is 3 for TLC NAND when SLC mode
is used as WriteBooster Buffer. 2 for MLC NAND.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/wb_max_alloc_units
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the Maximum total WriteBooster Buffer size
which is supported by the entire device.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/wb_max_wb_luns
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the maximum number of luns that can support
WriteBooster.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/wb_sup_red_type
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: The supportability of user space reduction mode
and preserve user space mode.
00h: WriteBooster Buffer can be configured only in
user space reduction type.
01h: WriteBooster Buffer can be configured only in
preserve user space type.
02h: Device can be configured in either user space
reduction type or preserve user space type.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/wb_sup_wb_type
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: The supportability of WriteBooster Buffer type.
00h: LU based WriteBooster Buffer configuration
01h: Single shared WriteBooster Buffer
configuration
02h: Supporting both LU based WriteBooster
Buffer and Single shared WriteBooster Buffer
configuration
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/flags/wb_enable
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the status of WriteBooster.
0: WriteBooster is not enabled.
1: WriteBooster is enabled
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/flags/wb_flush_en
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows if flush is enabled.
0: Flush operation is not performed.
1: Flush operation is performed.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/flags/wb_flush_during_h8
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: Flush WriteBooster Buffer during hibernate state.
0: Device is not allowed to flush the
WriteBooster Buffer during link hibernate
state.
1: Device is allowed to flush the
WriteBooster Buffer during link hibernate
state
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/attributes/wb_avail_buf
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the amount of unused WriteBooster buffer
available.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/attributes/wb_cur_buf
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the amount of unused current buffer.
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/attributes/wb_flush_status
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the flush operation status.
00h: idle
01h: Flush operation in progress
02h: Flush operation stopped prematurely.
03h: Flush operation completed successfully
04h: Flush operation general failure
The file is read only.
What: /sys/bus/platform/drivers/ufshcd/*/attributes/wb_life_time_est
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows an indication of the WriteBooster Buffer
lifetime based on the amount of performed program/erase cycles
01h: 0% - 10% WriteBooster Buffer life time used
...
0Ah: 90% - 100% WriteBooster Buffer life time used
The file is read only.
What: /sys/class/scsi_device/*/device/unit_descriptor/wb_buf_alloc_units
Date: June 2020
Contact: Asutosh Das <asutoshd@codeaurora.org>
Description: This entry shows the configured size of WriteBooster buffer.
0400h corresponds to 4GB.
The file is read only.