Adds sysfs documentation for WriteBooster entries.
Signed-off-by: Asutosh Das <asuto...@codeaurora.org>
---
Documentation/ABI/testing/sysfs-driver-ufs | 136 +++++++++++++++++++++++++++++
1 file changed, 136 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-driver-ufs
b/Documentation/ABI/testing/sysfs-driver-ufs
index 016724e..d1a3521 100644
--- a/Documentation/ABI/testing/sysfs-driver-ufs
+++ b/Documentation/ABI/testing/sysfs-driver-ufs
@@ -883,3 +883,139 @@ Contact: Subhash Jadavani <subha...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@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 <asuto...@codeaurora.org>
+Description: This entry shows the configured size of WriteBooster buffer.
+ 0400h corresponds to 4GB.
+ The file is read only.
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux
Foundation Collaborative Project.
