1b2441318SGreg Kroah-Hartman# SPDX-License-Identifier: GPL-2.0 23a65dfe8SJens Axboe# 33a65dfe8SJens Axboe# Block layer core configuration 43a65dfe8SJens Axboe# 516ed002fSJan Engelhardtmenuconfig BLOCK 66a108a14SDavid Rientjes bool "Enable the block layer" if EXPERT 79361401eSDavid Howells default y 888459642SOmar Sandoval select SBITMAP 96a83e74dSBart Van Assche select SRCU 109361401eSDavid Howells help 11ee86418dSNick Andrew Provide block layer support for the kernel. 129361401eSDavid Howells 13ee86418dSNick Andrew Disable this option to remove the block layer support from the 14ee86418dSNick Andrew kernel. This may be useful for embedded devices. 15ee86418dSNick Andrew 16ee86418dSNick Andrew If this option is disabled: 17ee86418dSNick Andrew 18ee86418dSNick Andrew - block device files will become unusable 19ee86418dSNick Andrew - some filesystems (such as ext3) will become unavailable. 20ee86418dSNick Andrew 21ee86418dSNick Andrew Also, SCSI character devices and USB storage will be disabled since 22ee86418dSNick Andrew they make use of various block layer definitions and facilities. 239361401eSDavid Howells 249361401eSDavid Howells Say Y here unless you know you really don't want to mount disks and 259361401eSDavid Howells suchlike. 269361401eSDavid Howells 279361401eSDavid Howellsif BLOCK 289361401eSDavid Howells 2972148aecSChristoph Hellwigconfig BLK_SCSI_REQUEST 3072148aecSChristoph Hellwig bool 3172148aecSChristoph Hellwig 323d6392cfSJens Axboeconfig BLK_DEV_BSG 3314d9fa35SJohn Stoffel bool "Block layer SG support v4" 3414d9fa35SJohn Stoffel default y 3572148aecSChristoph Hellwig select BLK_SCSI_REQUEST 3614d9fa35SJohn Stoffel help 37319a7b7fSFUJITA Tomonori Saying Y here will enable generic SG (SCSI generic) v4 support 38319a7b7fSFUJITA Tomonori for any block device. 39319a7b7fSFUJITA Tomonori 40319a7b7fSFUJITA Tomonori Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4 41319a7b7fSFUJITA Tomonori can handle complicated SCSI commands: tagged variable length cdbs 42319a7b7fSFUJITA Tomonori with bidirectional data transfers and generic request/response 43319a7b7fSFUJITA Tomonori protocols (e.g. Task Management Functions and SMP in Serial 44319a7b7fSFUJITA Tomonori Attached SCSI). 453d6392cfSJens Axboe 4614d9fa35SJohn Stoffel This option is required by recent UDEV versions to properly 4714d9fa35SJohn Stoffel access device serial numbers, etc. 4814d9fa35SJohn Stoffel 4914d9fa35SJohn Stoffel If unsure, say Y. 50ee86418dSNick Andrew 51aa387cc8SMike Christieconfig BLK_DEV_BSGLIB 52aa387cc8SMike Christie bool "Block layer SG support v4 helper lib" 53aa387cc8SMike Christie select BLK_DEV_BSG 5472148aecSChristoph Hellwig select BLK_SCSI_REQUEST 55aa387cc8SMike Christie help 56aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 57aa387cc8SMike Christie normally need to manually enable this. 58aa387cc8SMike Christie 59aa387cc8SMike Christie If unsure, say N. 60aa387cc8SMike Christie 617ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 627ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 632341c2f8SMartin K. Petersen select CRC_T10DIF if BLK_DEV_INTEGRITY 647ba1ba12SMartin K. Petersen ---help--- 657ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 667ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 677ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 687ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 697ba1ba12SMartin K. Petersen 707ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 717ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 727ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 737ba1ba12SMartin K. Petersen 746a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 756a0cb1bcSHannes Reinecke bool "Zoned block device support" 766a0cb1bcSHannes Reinecke ---help--- 776a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 786a0cb1bcSHannes Reinecke support for ZAC/ZBC host-managed and host-aware zoned block devices. 796a0cb1bcSHannes Reinecke 806a0cb1bcSHannes Reinecke Say yes here if you have a ZAC or ZBC storage device. 816a0cb1bcSHannes Reinecke 82e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 83e43473b7SVivek Goyal bool "Block layer bio throttling support" 848e42e0a2SKees Cook depends on BLK_CGROUP=y 85e43473b7SVivek Goyal ---help--- 86e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 87e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 88e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 89e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 90e43473b7SVivek Goyal 91*99c8b231SMauro Carvalho Chehab See Documentation/cgroup-v1/blkio-controller.rst for more information. 92e43473b7SVivek Goyal 93327ffb9bSShaohua Liconfig BLK_DEV_THROTTLING_LOW 94327ffb9bSShaohua Li bool "Block throttling .low limit interface support (EXPERIMENTAL)" 95327ffb9bSShaohua Li depends on BLK_DEV_THROTTLING 96327ffb9bSShaohua Li ---help--- 97327ffb9bSShaohua Li Add .low limit interface for block throttling. The low limit is a best 98327ffb9bSShaohua Li effort limit to prioritize cgroups. Depending on the setting, the limit 99327ffb9bSShaohua Li can be used to protect cgroups in terms of bandwidth/iops and better 100327ffb9bSShaohua Li utilize disk resource. 101327ffb9bSShaohua Li 102327ffb9bSShaohua Li Note, this is an experimental interface and could be changed someday. 103327ffb9bSShaohua Li 104080506adSPaul Gortmakerconfig BLK_CMDLINE_PARSER 105bab55417SCai Zhiyong bool "Block device command line partition parser" 106bab55417SCai Zhiyong ---help--- 107080506adSPaul Gortmaker Enabling this option allows you to specify the partition layout from 108080506adSPaul Gortmaker the kernel boot args. This is typically of use for embedded devices 109080506adSPaul Gortmaker which don't otherwise have any standardized method for listing the 110080506adSPaul Gortmaker partitions on a block device. 111080506adSPaul Gortmaker 112080506adSPaul Gortmaker See Documentation/block/cmdline-partition.txt for more information. 113bab55417SCai Zhiyong 11487760e5eSJens Axboeconfig BLK_WBT 11587760e5eSJens Axboe bool "Enable support for block device writeback throttling" 11687760e5eSJens Axboe ---help--- 11787760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 11887760e5eSJens Axboe background writeback from the VM, making it more smooth and having 11987760e5eSJens Axboe less impact on foreground operations. The throttling is done 12087760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 12187760e5eSJens Axboe the realtime performance of the disk. 12287760e5eSJens Axboe 123d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 124d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 125d7067512SJosef Bacik depends on BLK_CGROUP=y 126d7067512SJosef Bacik ---help--- 127d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 128d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 129d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 130d7067512SJosef Bacik target than the victimized group. 131d7067512SJosef Bacik 132d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 133d7067512SJosef Bacik 13487760e5eSJens Axboeconfig BLK_WBT_MQ 13587760e5eSJens Axboe bool "Multiqueue writeback throttling" 13687760e5eSJens Axboe default y 13787760e5eSJens Axboe depends on BLK_WBT 13887760e5eSJens Axboe ---help--- 13987760e5eSJens Axboe Enable writeback throttling by default on multiqueue devices. 14087760e5eSJens Axboe Multiqueue currently doesn't have support for IO scheduling, 14187760e5eSJens Axboe enabling this option is recommended. 14287760e5eSJens Axboe 143400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 144400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 145400f73b2SOmar Sandoval default y 146400f73b2SOmar Sandoval depends on DEBUG_FS 147400f73b2SOmar Sandoval ---help--- 148400f73b2SOmar Sandoval Include block layer debugging information in debugfs. This information 149400f73b2SOmar Sandoval is mostly useful for kernel developers, but it doesn't incur any cost 150400f73b2SOmar Sandoval at runtime. 151400f73b2SOmar Sandoval 152400f73b2SOmar Sandoval Unless you are building a kernel for a tiny system, you should 153400f73b2SOmar Sandoval say Y here. 154400f73b2SOmar Sandoval 1556a5ac984SBart Van Asscheconfig BLK_DEBUG_FS_ZONED 1566a5ac984SBart Van Assche bool 1576a5ac984SBart Van Assche default BLK_DEBUG_FS && BLK_DEV_ZONED 1586a5ac984SBart Van Assche 159455a7b23SScott Bauerconfig BLK_SED_OPAL 160455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 161455a7b23SScott Bauer ---help--- 162455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 163455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 164455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 165455a7b23SScott Bauer 1669be96f3fSAl Viromenu "Partition Types" 1679be96f3fSAl Viro 1689be96f3fSAl Virosource "block/partitions/Kconfig" 1699be96f3fSAl Viro 1709be96f3fSAl Viroendmenu 1719be96f3fSAl Viro 1722b9e0aaeSLinus Torvaldsendif # BLOCK 1732b9e0aaeSLinus Torvalds 17499874d50SJens Axboeconfig BLOCK_COMPAT 17599874d50SJens Axboe bool 1762b9e0aaeSLinus Torvalds depends on BLOCK && COMPAT 17799874d50SJens Axboe default y 17899874d50SJens Axboe 1798ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 1808ec2ef2bSStephen Rothwell bool 1818ec2ef2bSStephen Rothwell depends on BLOCK && PCI 1828ec2ef2bSStephen Rothwell default y 1838ec2ef2bSStephen Rothwell 18473473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 18573473427SChristoph Hellwig bool 18673473427SChristoph Hellwig depends on BLOCK && VIRTIO 18773473427SChristoph Hellwig default y 18873473427SChristoph Hellwig 18924c5dc66SSagi Grimbergconfig BLK_MQ_RDMA 19024c5dc66SSagi Grimberg bool 19124c5dc66SSagi Grimberg depends on BLOCK && INFINIBAND 19224c5dc66SSagi Grimberg default y 19324c5dc66SSagi Grimberg 194bca6b067SBart Van Asscheconfig BLK_PM 195bca6b067SBart Van Assche def_bool BLOCK && PM 196bca6b067SBart Van Assche 1978636a1f9SMasahiro Yamadasource "block/Kconfig.iosched" 198