| What: /sys/bus/*/drivers/ufshcd/*/auto_hibern8 |
| Date: March 2018 |
| Contact: linux-scsi@vger.kernel.org |
| Description: |
| This file contains the auto-hibernate idle timer setting of a |
| UFS host controller. A value of '0' means auto-hibernate is not |
| enabled. Otherwise the value is the number of microseconds of |
| idle time before the UFS host controller will autonomously put |
| the link into hibernate state. That will save power at the |
| expense of increased latency. Note that the hardware supports |
| 10-bit values with a power-of-ten multiplier which allows a |
| maximum value of 102300000. Refer to the UFS Host Controller |
| Interface specification for more details. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_type |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_type |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the device type. This is one of the UFS |
| device descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_class |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_class |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the device class. This is one of the UFS |
| device descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_sub_class |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_sub_class |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the UFS storage subclass. This is one of |
| the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/protocol |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/protocol |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the protocol supported by an UFS device. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_luns |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/number_of_luns |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows number of logical units. This is one of |
| the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_wluns |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/number_of_wluns |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows number of well known logical units. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/boot_enable |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/boot_enable |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows value that indicates whether the device is |
| enabled for boot. This is one of the UFS device descriptor |
| parameters. The full information about the descriptor could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/descriptor_access_enable |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/descriptor_access_enable |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows value that indicates whether the device |
| descriptor could be read after partial initialization phase |
| of the boot sequence. This is one of the UFS device descriptor |
| parameters. The full information about the descriptor could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/initial_power_mode |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/initial_power_mode |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows value that defines the power mode after |
| device initialization or hardware reset. This is one of |
| the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/high_priority_lun |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/high_priority_lun |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the high priority lun. This is one of |
| the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/secure_removal_type |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/secure_removal_type |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the secure removal type. This is one of |
| the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/support_security_lun |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/support_security_lun |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the security lun is supported. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/bkops_termination_latency |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/bkops_termination_latency |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the background operations termination |
| latency. This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/initial_active_icc_level |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/initial_active_icc_level |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the initial active ICC level. This is one |
| of the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/specification_version |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/specification_version |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the specification version. This is one |
| of the UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/manufacturing_date |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/manufacturing_date |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the manufacturing date in BCD format. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/manufacturer_id |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/manufacturer_id |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the manufacturer ID. This is one of the |
| UFS device descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/rtt_capability |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/rtt_capability |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum number of outstanding RTTs |
| supported by the device. This is one of the UFS device |
| descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/rtc_update |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/rtc_update |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the frequency and method of the realtime |
| clock update. This is one of the UFS device descriptor |
| parameters. The full information about the descriptor |
| could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/ufs_features |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/ufs_features |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows which features are supported by the device. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be |
| found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/ffu_timeout |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/ffu_timeout |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the FFU timeout. This is one of the |
| UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/queue_depth |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/queue_depth |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the device queue depth. This is one of the |
| UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/device_version |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/device_version |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the device version. This is one of the |
| UFS device descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/number_of_secure_wpa |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/number_of_secure_wpa |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows number of secure write protect areas |
| supported by the device. This is one of the UFS device |
| descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/psa_max_data_size |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/psa_max_data_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum amount of data that may be |
| written during the pre-soldering phase of the PSA flow. |
| This is one of the UFS device descriptor parameters. |
| The full information about the descriptor could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/psa_state_timeout |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/psa_state_timeout |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the command maximum timeout for a change |
| in PSA state. This is one of the UFS device descriptor |
| parameters. The full information about the descriptor could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/interconnect_descriptor/unipro_version |
| What: /sys/bus/platform/devices/*.ufs/interconnect_descriptor/unipro_version |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the MIPI UniPro version number in BCD format. |
| This is one of the UFS interconnect descriptor parameters. |
| The full information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/interconnect_descriptor/mphy_version |
| What: /sys/bus/platform/devices/*.ufs/interconnect_descriptor/mphy_version |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the MIPI M-PHY version number in BCD format. |
| This is one of the UFS interconnect descriptor parameters. |
| The full information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/raw_device_capacity |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/raw_device_capacity |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the total memory quantity available to |
| the user to configure the device logical units. This is one |
| of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/max_number_of_luns |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/max_number_of_luns |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum number of logical units |
| supported by the UFS device. This is one of the UFS |
| geometry descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/segment_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/segment_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the segment size. This is one of the UFS |
| geometry descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/allocation_unit_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/allocation_unit_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the allocation unit size. This is one of |
| the UFS geometry descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/min_addressable_block_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/min_addressable_block_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the minimum addressable block size. This |
| is one of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at UFS |
| specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/optimal_read_block_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/optimal_read_block_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the optimal read block size. This is one |
| of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at UFS |
| specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/optimal_write_block_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/optimal_write_block_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the optimal write block size. This is one |
| of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at UFS |
| specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/max_in_buffer_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/max_in_buffer_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum data-in buffer size. This |
| is one of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at UFS |
| specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/max_out_buffer_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/max_out_buffer_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum data-out buffer size. This |
| is one of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at UFS |
| specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/rpmb_rw_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/rpmb_rw_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum number of RPMB frames allowed |
| in Security Protocol In/Out. This is one of the UFS geometry |
| descriptor parameters. The full information about the |
| descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/dyn_capacity_resource_policy |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/dyn_capacity_resource_policy |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the dynamic capacity resource policy. This |
| is one of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/data_ordering |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/data_ordering |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows support for out-of-order data transfer. |
| This is one of the UFS geometry descriptor parameters. |
| The full information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/max_number_of_contexts |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/max_number_of_contexts |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows maximum available number of contexts which |
| are supported by the device. This is one of the UFS geometry |
| descriptor parameters. The full information about the |
| descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/sys_data_tag_unit_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/sys_data_tag_unit_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows system data tag unit size. This is one of |
| the UFS geometry descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/sys_data_tag_resource_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/sys_data_tag_resource_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows maximum storage area size allocated by |
| the device to handle system data by the tagging mechanism. |
| This is one of the UFS geometry descriptor parameters. |
| The full information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/secure_removal_types |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/secure_removal_types |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows supported secure removal types. This is |
| one of the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/memory_types |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/memory_types |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows supported memory types. This is one of |
| the UFS geometry descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/*_memory_max_alloc_units |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/*_memory_max_alloc_units |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum number of allocation units for |
| different memory types (system code, non persistent, |
| enhanced type 1-4). This is one of the UFS geometry |
| descriptor parameters. The full information about the |
| descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/*_memory_capacity_adjustment_factor |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/*_memory_capacity_adjustment_factor |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the memory capacity adjustment factor for |
| different memory types (system code, non persistent, |
| enhanced type 1-4). This is one of the UFS geometry |
| descriptor parameters. The full information about the |
| descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/health_descriptor/eol_info |
| What: /sys/bus/platform/devices/*.ufs/health_descriptor/eol_info |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows preend of life information. This is one |
| of the UFS health descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/health_descriptor/life_time_estimation_a |
| What: /sys/bus/platform/devices/*.ufs/health_descriptor/life_time_estimation_a |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows indication of the device life time |
| (method a). This is one of the UFS health descriptor |
| parameters. The full information about the descriptor |
| could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/health_descriptor/life_time_estimation_b |
| What: /sys/bus/platform/devices/*.ufs/health_descriptor/life_time_estimation_b |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows indication of the device life time |
| (method b). This is one of the UFS health descriptor |
| parameters. The full information about the descriptor |
| could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/power_descriptor/active_icc_levels_vcc* |
| What: /sys/bus/platform/devices/*.ufs/power_descriptor/active_icc_levels_vcc* |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows maximum VCC, VCCQ and VCCQ2 value for |
| active ICC levels from 0 to 15. This is one of the UFS |
| power descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/manufacturer_name |
| What: /sys/bus/platform/devices/*.ufs/string_descriptors/manufacturer_name |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file contains a device manufacturer name string. |
| The full information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/product_name |
| What: /sys/bus/platform/devices/*.ufs/string_descriptors/product_name |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file contains a product name string. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/oem_id |
| What: /sys/bus/platform/devices/*.ufs/string_descriptors/oem_id |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file contains a OEM ID string. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/serial_number |
| What: /sys/bus/platform/devices/*.ufs/string_descriptors/serial_number |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file contains a device serial number string. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/string_descriptors/product_revision |
| What: /sys/bus/platform/devices/*.ufs/string_descriptors/product_revision |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file contains a product revision string. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/boot_lun_id |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows boot LUN information. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/lun_write_protect |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows LUN write protection status. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/lun_queue_depth |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows LUN queue depth. This is one of the UFS |
| unit descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/psa_sensitive |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows PSA sensitivity. This is one of the UFS |
| unit descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/lun_memory_type |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows LUN memory type. This is one of the UFS |
| unit descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/data_reliability |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file defines the device behavior when a power failure |
| occurs during a write operation. This is one of the UFS |
| unit descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/logical_block_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the size of addressable logical blocks |
| (calculated as an exponent with base 2). This is one of |
| the UFS unit descriptor parameters. The full information about |
| the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/logical_block_count |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows total number of addressable logical blocks. |
| This is one of the UFS unit descriptor parameters. The full |
| information about the descriptor could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/erase_block_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the erase block size. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/provisioning_type |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the thin provisioning type. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/physical_memory_resourse_count |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the total physical memory resources. This is |
| one of the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/context_capabilities |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the context capabilities. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/large_unit_granularity |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the granularity of the LUN. This is one of |
| the UFS unit descriptor parameters. The full information |
| about the descriptor could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/device_init |
| What: /sys/bus/platform/devices/*.ufs/flags/device_init |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the device init status. The full information |
| about the flag could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/permanent_wpe |
| What: /sys/bus/platform/devices/*.ufs/flags/permanent_wpe |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether permanent write protection is enabled. |
| The full information about the flag could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/power_on_wpe |
| What: /sys/bus/platform/devices/*.ufs/flags/power_on_wpe |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether write protection is enabled on all |
| logical units configured as power on write protected. The |
| full information about the flag could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/bkops_enable |
| What: /sys/bus/platform/devices/*.ufs/flags/bkops_enable |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the device background operations are |
| enabled. The full information about the flag could be |
| found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/life_span_mode_enable |
| What: /sys/bus/platform/devices/*.ufs/flags/life_span_mode_enable |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the device life span mode is enabled. |
| The full information about the flag could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/phy_resource_removal |
| What: /sys/bus/platform/devices/*.ufs/flags/phy_resource_removal |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether physical resource removal is enable. |
| The full information about the flag could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/busy_rtc |
| What: /sys/bus/platform/devices/*.ufs/flags/busy_rtc |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the device is executing internal |
| operation related to real time clock. The full information |
| about the flag could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/disable_fw_update |
| What: /sys/bus/platform/devices/*.ufs/flags/disable_fw_update |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the device FW update is permanently |
| disabled. The full information about the flag could be found |
| at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/boot_lun_enabled |
| What: /sys/bus/platform/devices/*.ufs/attributes/boot_lun_enabled |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the boot lun enabled UFS device attribute. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/current_power_mode |
| What: /sys/bus/platform/devices/*.ufs/attributes/current_power_mode |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the current power mode UFS device attribute. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/active_icc_level |
| What: /sys/bus/platform/devices/*.ufs/attributes/active_icc_level |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the active icc level UFS device attribute. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/ooo_data_enabled |
| What: /sys/bus/platform/devices/*.ufs/attributes/ooo_data_enabled |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the out of order data transfer enabled UFS |
| device attribute. The full information about the attribute |
| could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/bkops_status |
| What: /sys/bus/platform/devices/*.ufs/attributes/bkops_status |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the background operations status UFS device |
| attribute. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/purge_status |
| What: /sys/bus/platform/devices/*.ufs/attributes/purge_status |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the purge operation status UFS device |
| attribute. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/max_data_in_size |
| What: /sys/bus/platform/devices/*.ufs/attributes/max_data_in_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum data size in a DATA IN |
| UPIU. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/max_data_out_size |
| What: /sys/bus/platform/devices/*.ufs/attributes/max_data_out_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the maximum number of bytes that can be |
| requested with a READY TO TRANSFER UPIU. The full information |
| about the attribute could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/reference_clock_frequency |
| What: /sys/bus/platform/devices/*.ufs/attributes/reference_clock_frequency |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the reference clock frequency UFS device |
| attribute. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/configuration_descriptor_lock |
| What: /sys/bus/platform/devices/*.ufs/attributes/configuration_descriptor_lock |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows whether the configuration descriptor is locked. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/max_number_of_rtt |
| What: /sys/bus/platform/devices/*.ufs/attributes/max_number_of_rtt |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the maximum current number of |
| outstanding RTTs in device that is allowed. The full |
| information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/exception_event_control |
| What: /sys/bus/platform/devices/*.ufs/attributes/exception_event_control |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the exception event control UFS device |
| attribute. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/exception_event_status |
| What: /sys/bus/platform/devices/*.ufs/attributes/exception_event_status |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the exception event status UFS device |
| attribute. The full information about the attribute could |
| be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/ffu_status |
| What: /sys/bus/platform/devices/*.ufs/attributes/ffu_status |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file provides the ffu status UFS device attribute. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/psa_state |
| What: /sys/bus/platform/devices/*.ufs/attributes/psa_state |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file show the PSA feature status. The full information |
| about the attribute could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/psa_data_size |
| What: /sys/bus/platform/devices/*.ufs/attributes/psa_data_size |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the amount of data that the host plans to |
| load to all logical units in pre-soldering state. |
| The full information about the attribute could be found at |
| UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/class/scsi_device/*/device/dyn_cap_needed |
| Date: February 2018 |
| Contact: Stanislav Nijnikov <stanislav.nijnikov@wdc.com> |
| Description: This file shows the amount of physical memory needed |
| to be removed from the physical memory resources pool of |
| the particular logical unit. The full information about |
| the attribute could be found at UFS specifications 2.1. |
| |
| The file is read only. |
| |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/rpm_lvl |
| What: /sys/bus/platform/devices/*.ufs/rpm_lvl |
| Date: September 2014 |
| Contact: Subhash Jadavani <subhashj@codeaurora.org> |
| Description: This entry could be used to set or show the UFS device |
| runtime power management level. The current driver |
| implementation supports 7 levels with next target states: |
| |
| == ==================================================== |
| 0 UFS device will stay active, UIC link will |
| stay active |
| 1 UFS device will stay active, UIC link will |
| hibernate |
| 2 UFS device will be moved to sleep, UIC link will |
| stay active |
| 3 UFS device will be moved to sleep, UIC link will |
| hibernate |
| 4 UFS device will be powered off, UIC link will |
| hibernate |
| 5 UFS device will be powered off, UIC link will |
| be powered off |
| 6 UFS device will be moved to deep sleep, UIC link |
| will be powered off. Note, deep sleep might not be |
| supported in which case this value will not be |
| accepted |
| == ==================================================== |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/rpm_target_dev_state |
| What: /sys/bus/platform/devices/*.ufs/rpm_target_dev_state |
| Date: February 2018 |
| Contact: Subhash Jadavani <subhashj@codeaurora.org> |
| Description: This entry shows the target power mode of an UFS device |
| for the chosen runtime power management level. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/rpm_target_link_state |
| What: /sys/bus/platform/devices/*.ufs/rpm_target_link_state |
| Date: February 2018 |
| Contact: Subhash Jadavani <subhashj@codeaurora.org> |
| Description: This entry shows the target state of an UFS UIC link |
| for the chosen runtime power management level. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/spm_lvl |
| What: /sys/bus/platform/devices/*.ufs/spm_lvl |
| Date: September 2014 |
| Contact: Subhash Jadavani <subhashj@codeaurora.org> |
| Description: This entry could be used to set or show the UFS device |
| system power management level. The current driver |
| implementation supports 7 levels with next target states: |
| |
| == ==================================================== |
| 0 UFS device will stay active, UIC link will |
| stay active |
| 1 UFS device will stay active, UIC link will |
| hibernate |
| 2 UFS device will be moved to sleep, UIC link will |
| stay active |
| 3 UFS device will be moved to sleep, UIC link will |
| hibernate |
| 4 UFS device will be powered off, UIC link will |
| hibernate |
| 5 UFS device will be powered off, UIC link will |
| be powered off |
| 6 UFS device will be moved to deep sleep, UIC link |
| will be powered off. Note, deep sleep might not be |
| supported in which case this value will not be |
| accepted |
| == ==================================================== |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/spm_target_dev_state |
| What: /sys/bus/platform/devices/*.ufs/spm_target_dev_state |
| Date: February 2018 |
| Contact: Subhash Jadavani <subhashj@codeaurora.org> |
| Description: This entry shows the target power mode of an UFS device |
| for the chosen system power management level. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/spm_target_link_state |
| What: /sys/bus/platform/devices/*.ufs/spm_target_link_state |
| Date: February 2018 |
| 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/*/monitor/monitor_enable |
| What: /sys/bus/platform/devices/*.ufs/monitor/monitor_enable |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the status of performance monitor enablement |
| and it can be used to start/stop the monitor. When the monitor |
| is stopped, the performance data collected is also cleared. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/monitor_chunk_size |
| What: /sys/bus/platform/devices/*.ufs/monitor/monitor_chunk_size |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file tells the monitor to focus on requests transferring |
| data of specific chunk size (in Bytes). 0 means any chunk size. |
| It can only be changed when monitor is disabled. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_total_sectors |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_total_sectors |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how many sectors (in 512 Bytes) have been |
| sent from device to host after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_total_busy |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_total_busy |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how long (in micro seconds) has been spent |
| sending data from device to host after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_nr_requests |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_nr_requests |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how many read requests have been sent after |
| monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_req_latency_max |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_req_latency_max |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the maximum latency (in micro seconds) of |
| read requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_req_latency_min |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_req_latency_min |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the minimum latency (in micro seconds) of |
| read requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_req_latency_avg |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_req_latency_avg |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the average latency (in micro seconds) of |
| read requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/read_req_latency_sum |
| What: /sys/bus/platform/devices/*.ufs/monitor/read_req_latency_sum |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the total latency (in micro seconds) of |
| read requests sent after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_total_sectors |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_total_sectors |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how many sectors (in 512 Bytes) have been sent |
| from host to device after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_total_busy |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_total_busy |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how long (in micro seconds) has been spent |
| sending data from host to device after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_nr_requests |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_nr_requests |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows how many write requests have been sent after |
| monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_req_latency_max |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_req_latency_max |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the maximum latency (in micro seconds) of write |
| requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_req_latency_min |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_req_latency_min |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the minimum latency (in micro seconds) of write |
| requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/monitor/write_req_latency_avg |
| What: /sys/bus/platform/devices/*.ufs/monitor/write_req_latency_avg |
| Date: January 2021 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the average latency (in micro seconds) of write |
| requests after monitor gets started. |
| |
| 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 |
| Contact: Can Guo <cang@codeaurora.org> |
| Description: This file shows the total latency (in micro seconds) of write |
| requests after monitor gets started. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/wb_presv_us_en |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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 |
| What: /sys/bus/platform/devices/*.ufs/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. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/wb_on |
| What: /sys/bus/platform/devices/*.ufs/wb_on |
| Date: January 2021 |
| Contact: Bean Huo <beanhuo@micron.com> |
| Description: This node is used to set or display whether UFS WriteBooster is |
| enabled. Echo 0 to this file to disable UFS WriteBooster or 1 to |
| enable it. The WriteBooster is enabled after power-on/reset, |
| however, it will be disabled/enable while CLK scaling down/up |
| (if the platform supports UFSHCD_CAP_CLK_SCALING). For a |
| platform that doesn't support UFSHCD_CAP_CLK_SCALING, we can |
| disable/enable WriteBooster through this sysfs node. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/hpb_version |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/hpb_version |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the HPB specification version. |
| The full information about the descriptor can be found in the UFS |
| HPB (Host Performance Booster) Extension specifications. |
| Example: version 1.2.3 = 0123h |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/device_descriptor/hpb_control |
| What: /sys/bus/platform/devices/*.ufs/device_descriptor/hpb_control |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows an indication of the HPB control mode. |
| 00h: Host control mode |
| 01h: Device control mode |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/hpb_region_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/hpb_region_size |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the bHPBRegionSize which can be calculated |
| as in the following (in bytes): |
| HPB Region size = 512B * 2^bHPBRegionSize |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/hpb_number_lu |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/hpb_number_lu |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the maximum number of HPB LU supported by |
| the device. |
| 00h: HPB is not supported by the device. |
| 01h ~ 20h: Maximum number of HPB LU supported by the device |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/hpb_subregion_size |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/hpb_subregion_size |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the bHPBSubRegionSize, which can be |
| calculated as in the following (in bytes) and shall be a multiple of |
| logical block size: |
| HPB Sub-Region size = 512B x 2^bHPBSubRegionSize |
| bHPBSubRegionSize shall not exceed bHPBRegionSize. |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/geometry_descriptor/hpb_max_active_regions |
| What: /sys/bus/platform/devices/*.ufs/geometry_descriptor/hpb_max_active_regions |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the maximum number of active HPB regions that |
| is supported by the device. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/hpb_lu_max_active_regions |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the maximum number of HPB regions assigned to |
| the HPB logical unit. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/hpb_pinned_region_start_offset |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the start offset of HPB pinned region. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/unit_descriptor/hpb_number_pinned_regions |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of HPB pinned regions assigned to |
| the HPB logical unit. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/hit_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of reads that changed to HPB read. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/miss_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of reads that cannot be changed to |
| HPB read. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/rb_noti_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of response UPIUs that has |
| recommendations for activating sub-regions and/or inactivating region. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/rb_active_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of active sub-regions recommended by |
| response UPIUs. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/rb_inactive_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of inactive regions recommended by |
| response UPIUs. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_stats/map_req_cnt |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the number of read buffer commands for |
| activating sub-regions recommended by response UPIUs. |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_params/requeue_timeout_ms |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the requeue timeout threshold for write buffer |
| command in ms. The value can be changed by writing an integer to |
| this entry. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/attributes/max_data_size_hpb_single_cmd |
| What: /sys/bus/platform/devices/*.ufs/attributes/max_data_size_hpb_single_cmd |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the maximum HPB data size for using a single HPB |
| command. |
| |
| === ======== |
| 00h 4KB |
| 01h 8KB |
| 02h 12KB |
| ... |
| FFh 1024KB |
| === ======== |
| |
| The file is read only. |
| |
| What: /sys/bus/platform/drivers/ufshcd/*/flags/hpb_enable |
| What: /sys/bus/platform/devices/*.ufs/flags/hpb_enable |
| Date: June 2021 |
| Contact: Daejun Park <daejun7.park@samsung.com> |
| Description: This entry shows the status of HPB. |
| |
| == ============================ |
| 0 HPB is not enabled. |
| 1 HPB is enabled |
| == ============================ |
| |
| The file is read only. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/activation_thld |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: In host control mode, reads are the major source of activation |
| trials. Once this threshold hs met, the region is added to the |
| "to-be-activated" list. Since we reset the read counter upon |
| write, this include sending a rb command updating the region |
| ppn as well. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/normalization_factor |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: In host control mode, we think of the regions as "buckets". |
| Those buckets are being filled with reads, and emptied on write. |
| We use entries_per_srgn - the amount of blocks in a subregion as |
| our bucket size. This applies because HPB1.0 only handles |
| single-block reads. Once the bucket size is crossed, we trigger |
| a normalization work - not only to avoid overflow, but mainly |
| because we want to keep those counters normalized, as we are |
| using those reads as a comparative score, to make various decisions. |
| The normalization is dividing (shift right) the read counter by |
| the normalization_factor. If during consecutive normalizations |
| an active region has exhausted its reads - inactivate it. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/eviction_thld_enter |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: Region deactivation is often due to the fact that eviction took |
| place: A region becomes active at the expense of another. This is |
| happening when the max-active-regions limit has been crossed. |
| In host mode, eviction is considered an extreme measure. We |
| want to verify that the entering region has enough reads, and |
| the exiting region has much fewer reads. eviction_thld_enter is |
| the min reads that a region must have in order to be considered |
| a candidate for evicting another region. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/eviction_thld_exit |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: Same as above for the exiting region. A region is considered to |
| be a candidate for eviction only if it has fewer reads than |
| eviction_thld_exit. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/read_timeout_ms |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: In order not to hang on to "cold" regions, we inactivate |
| a region that has no READ access for a predefined amount of |
| time - read_timeout_ms. If read_timeout_ms has expired, and the |
| region is dirty, it is less likely that we can make any use of |
| HPB reading it so we inactivate it. Still, deactivation has |
| its overhead, and we may still benefit from HPB reading this |
| region if it is clean - see read_timeout_expiries. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/read_timeout_expiries |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: If the region read timeout has expired, but the region is clean, |
| just re-wind its timer for another spin. Do that as long as it |
| is clean and did not exhaust its read_timeout_expiries threshold. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/timeout_polling_interval_ms |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: The frequency with which the delayed worker that checks the |
| read_timeouts is awakened. |
| |
| What: /sys/class/scsi_device/*/device/hpb_param_sysfs/inflight_map_req |
| Date: February 2021 |
| Contact: Avri Altman <avri.altman@wdc.com> |
| Description: In host control mode the host is the originator of map requests. |
| To avoid flooding the device with map requests, use a simple throttling |
| mechanism that limits the number of inflight map requests. |
