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Date: Sun, 14 Jun 2020 09:53:26 +0000
From: Avri Altman <Avri.Altman@....com>
To: Asutosh Das <asutoshd@...eaurora.org>,
"gregkh@...gle.com" <gregkh@...gle.com>,
"cang@...eaurora.org" <cang@...eaurora.org>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 1/1] Documentation:sysfs-ufs: Add WriteBooster
documentation
>
> Adds sysfs documentation for WriteBooster entries.
>
> Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
Acked-by: Avri Altman <avri.altman@....com>
Maybe insert each field following the fields of the same descriptor, attributes, flags etc.
Thanks,
Avri
> ---
> 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
> <subhashj@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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_unit
> s
> +Date: June 2020
> +Contact: Asutosh Das <asutoshd@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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@...eaurora.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.
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