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 29fbdee71bSChristoph Hellwigconfig BLOCK_LEGACY_AUTOLOAD 30fbdee71bSChristoph Hellwig bool "Legacy autoloading support" 31*451f0b6fSChristoph Hellwig default y 32fbdee71bSChristoph Hellwig help 33fbdee71bSChristoph Hellwig Enable loading modules and creating block device instances based on 34fbdee71bSChristoph Hellwig accesses through their device special file. This is a historic Linux 35fbdee71bSChristoph Hellwig feature and makes no sense in a udev world where device files are 36*451f0b6fSChristoph Hellwig created on demand, but scripts that manually create device nodes and 37*451f0b6fSChristoph Hellwig then call losetup might rely on this behavior. 38fbdee71bSChristoph Hellwig 396f816b4bSTejun Heoconfig BLK_RQ_ALLOC_TIME 406f816b4bSTejun Heo bool 416f816b4bSTejun Heo 421d156646STejun Heoconfig BLK_CGROUP_RWSTAT 431d156646STejun Heo bool 441d156646STejun Heo 4578011042SChristoph Hellwigconfig BLK_DEV_BSG_COMMON 4678011042SChristoph Hellwig tristate 47ee86418dSNick Andrew 485ef16305SChristoph Hellwigconfig BLK_ICQ 495ef16305SChristoph Hellwig bool 505ef16305SChristoph Hellwig 51aa387cc8SMike Christieconfig BLK_DEV_BSGLIB 52aa387cc8SMike Christie bool "Block layer SG support v4 helper lib" 5378011042SChristoph Hellwig select BLK_DEV_BSG_COMMON 54aa387cc8SMike Christie help 55aa387cc8SMike Christie Subsystems will normally enable this if needed. Users will not 56aa387cc8SMike Christie normally need to manually enable this. 57aa387cc8SMike Christie 58aa387cc8SMike Christie If unsure, say N. 59aa387cc8SMike Christie 607ba1ba12SMartin K. Petersenconfig BLK_DEV_INTEGRITY 617ba1ba12SMartin K. Petersen bool "Block layer data integrity support" 62a7f7f624SMasahiro Yamada help 637ba1ba12SMartin K. Petersen Some storage devices allow extra information to be 647ba1ba12SMartin K. Petersen stored/retrieved to help protect the data. The block layer 657ba1ba12SMartin K. Petersen data integrity option provides hooks which can be used by 667ba1ba12SMartin K. Petersen filesystems to ensure better data integrity. 677ba1ba12SMartin K. Petersen 687ba1ba12SMartin K. Petersen Say yes here if you have a storage device that provides the 697ba1ba12SMartin K. Petersen T10/SCSI Data Integrity Field or the T13/ATA External Path 707ba1ba12SMartin K. Petersen Protection. If in doubt, say N. 717ba1ba12SMartin K. Petersen 72a754bd5fSHerbert Xuconfig BLK_DEV_INTEGRITY_T10 73a754bd5fSHerbert Xu tristate 74a754bd5fSHerbert Xu depends on BLK_DEV_INTEGRITY 75a754bd5fSHerbert Xu select CRC_T10DIF 76a754bd5fSHerbert Xu 776a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 786a0cb1bcSHannes Reinecke bool "Zoned block device support" 79b9aef63aSDamien Le Moal select MQ_IOSCHED_DEADLINE 80a7f7f624SMasahiro Yamada help 816a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 82240e6ee2SKeith Busch support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 83240e6ee2SKeith Busch devices. 846a0cb1bcSHannes Reinecke 85240e6ee2SKeith Busch Say yes here if you have a ZAC, ZBC, or ZNS storage device. 866a0cb1bcSHannes Reinecke 87e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 88e43473b7SVivek Goyal bool "Block layer bio throttling support" 89df252bdeSMasahiro Yamada depends on BLK_CGROUP 901d156646STejun Heo select BLK_CGROUP_RWSTAT 91a7f7f624SMasahiro Yamada help 92e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 93e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 94e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 95e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 96e43473b7SVivek Goyal 97da82c92fSMauro Carvalho Chehab See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 98e43473b7SVivek Goyal 99327ffb9bSShaohua Liconfig BLK_DEV_THROTTLING_LOW 100327ffb9bSShaohua Li bool "Block throttling .low limit interface support (EXPERIMENTAL)" 101327ffb9bSShaohua Li depends on BLK_DEV_THROTTLING 102a7f7f624SMasahiro Yamada help 103327ffb9bSShaohua Li Add .low limit interface for block throttling. The low limit is a best 104327ffb9bSShaohua Li effort limit to prioritize cgroups. Depending on the setting, the limit 105327ffb9bSShaohua Li can be used to protect cgroups in terms of bandwidth/iops and better 106327ffb9bSShaohua Li utilize disk resource. 107327ffb9bSShaohua Li 108327ffb9bSShaohua Li Note, this is an experimental interface and could be changed someday. 109327ffb9bSShaohua Li 11087760e5eSJens Axboeconfig BLK_WBT 11187760e5eSJens Axboe bool "Enable support for block device writeback throttling" 112a7f7f624SMasahiro Yamada help 11387760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 11487760e5eSJens Axboe background writeback from the VM, making it more smooth and having 11587760e5eSJens Axboe less impact on foreground operations. The throttling is done 11687760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 11787760e5eSJens Axboe the realtime performance of the disk. 11887760e5eSJens Axboe 1195f6776baSBart Van Asscheconfig BLK_WBT_MQ 1205f6776baSBart Van Assche bool "Enable writeback throttling by default" 1215f6776baSBart Van Assche default y 1225f6776baSBart Van Assche depends on BLK_WBT 1235f6776baSBart Van Assche help 1245f6776baSBart Van Assche Enable writeback throttling by default for request-based block devices. 1255f6776baSBart Van Assche 126d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 127d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 128df252bdeSMasahiro Yamada depends on BLK_CGROUP 129a7f7f624SMasahiro Yamada help 130d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 131d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 132d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 133d7067512SJosef Bacik target than the victimized group. 134d7067512SJosef Bacik 135d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 136d7067512SJosef Bacik 137d2bcbeabSMuneendra Kumarconfig BLK_CGROUP_FC_APPID 138d2bcbeabSMuneendra Kumar bool "Enable support to track FC I/O Traffic across cgroup applications" 139d2500a0cSMartin K. Petersen depends on BLK_CGROUP && NVME_FC 140d2bcbeabSMuneendra Kumar help 141d2bcbeabSMuneendra Kumar Enabling this option enables the support to track FC I/O traffic across 142d2bcbeabSMuneendra Kumar cgroup applications. It enables the Fabric and the storage targets to 143d2bcbeabSMuneendra Kumar identify, monitor, and handle FC traffic based on VM tags by inserting 144d2bcbeabSMuneendra Kumar application specific identification into the FC frame. 145d2bcbeabSMuneendra Kumar 1467caa4715STejun Heoconfig BLK_CGROUP_IOCOST 1477caa4715STejun Heo bool "Enable support for cost model based cgroup IO controller" 148df252bdeSMasahiro Yamada depends on BLK_CGROUP 149cd006509STejun Heo select BLK_RQ_IO_DATA_LEN 1507caa4715STejun Heo select BLK_RQ_ALLOC_TIME 151a7f7f624SMasahiro Yamada help 1527caa4715STejun Heo Enabling this option enables the .weight interface for cost 1537caa4715STejun Heo model based proportional IO control. The IO controller 1547caa4715STejun Heo distributes IO capacity between different groups based on 1557caa4715STejun Heo their share of the overall weight distribution. 1567caa4715STejun Heo 157556910e3SBart Van Asscheconfig BLK_CGROUP_IOPRIO 158556910e3SBart Van Assche bool "Cgroup I/O controller for assigning an I/O priority class" 159556910e3SBart Van Assche depends on BLK_CGROUP 160556910e3SBart Van Assche help 161556910e3SBart Van Assche Enable the .prio interface for assigning an I/O priority class to 162556910e3SBart Van Assche requests. The I/O priority class affects the order in which an I/O 163556910e3SBart Van Assche scheduler and block devices process requests. Only some I/O schedulers 164556910e3SBart Van Assche and some block devices support I/O priorities. 165556910e3SBart Van Assche 166400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 167400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 168400f73b2SOmar Sandoval default y 169400f73b2SOmar Sandoval depends on DEBUG_FS 170a7f7f624SMasahiro Yamada help 171400f73b2SOmar Sandoval Include block layer debugging information in debugfs. This information 172400f73b2SOmar Sandoval is mostly useful for kernel developers, but it doesn't incur any cost 173400f73b2SOmar Sandoval at runtime. 174400f73b2SOmar Sandoval 175400f73b2SOmar Sandoval Unless you are building a kernel for a tiny system, you should 176400f73b2SOmar Sandoval say Y here. 177400f73b2SOmar Sandoval 1786a5ac984SBart Van Asscheconfig BLK_DEBUG_FS_ZONED 1796a5ac984SBart Van Assche bool 1806a5ac984SBart Van Assche default BLK_DEBUG_FS && BLK_DEV_ZONED 1816a5ac984SBart Van Assche 182455a7b23SScott Bauerconfig BLK_SED_OPAL 183455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 184a7f7f624SMasahiro Yamada help 185455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 186455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 187455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 188455a7b23SScott Bauer 1891b262839SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION 1901b262839SSatya Tangirala bool "Enable inline encryption support in block layer" 1911b262839SSatya Tangirala help 1921b262839SSatya Tangirala Build the blk-crypto subsystem. Enabling this lets the 1931b262839SSatya Tangirala block layer handle encryption, so users can take 1941b262839SSatya Tangirala advantage of inline encryption hardware if present. 1951b262839SSatya Tangirala 196488f6682SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION_FALLBACK 197488f6682SSatya Tangirala bool "Enable crypto API fallback for blk-crypto" 198488f6682SSatya Tangirala depends on BLK_INLINE_ENCRYPTION 199488f6682SSatya Tangirala select CRYPTO 200488f6682SSatya Tangirala select CRYPTO_SKCIPHER 201488f6682SSatya Tangirala help 202488f6682SSatya Tangirala Enabling this lets the block layer handle inline encryption 203488f6682SSatya Tangirala by falling back to the kernel crypto API when inline 204488f6682SSatya Tangirala encryption hardware is not present. 205488f6682SSatya Tangirala 2069be96f3fSAl Virosource "block/partitions/Kconfig" 2079be96f3fSAl Viro 20899874d50SJens Axboeconfig BLOCK_COMPAT 209c50fca55SMasahiro Yamada def_bool COMPAT 21099874d50SJens Axboe 2118ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 212c50fca55SMasahiro Yamada def_bool PCI 2138ec2ef2bSStephen Rothwell 21473473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 21573473427SChristoph Hellwig bool 216c50fca55SMasahiro Yamada depends on VIRTIO 21773473427SChristoph Hellwig default y 21873473427SChristoph Hellwig 21924c5dc66SSagi Grimbergconfig BLK_MQ_RDMA 22024c5dc66SSagi Grimberg bool 221c50fca55SMasahiro Yamada depends on INFINIBAND 22224c5dc66SSagi Grimberg default y 22324c5dc66SSagi Grimberg 224bca6b067SBart Van Asscheconfig BLK_PM 225c50fca55SMasahiro Yamada def_bool PM 226bca6b067SBart Van Assche 227c66fd019SChristoph Hellwig# do not use in new code 228c66fd019SChristoph Hellwigconfig BLOCK_HOLDER_DEPRECATED 229c66fd019SChristoph Hellwig bool 230c66fd019SChristoph Hellwig 231248c7933SChristoph Hellwigconfig BLK_MQ_STACKING 232248c7933SChristoph Hellwig bool 233248c7933SChristoph Hellwig 2348636a1f9SMasahiro Yamadasource "block/Kconfig.iosched" 235c50fca55SMasahiro Yamada 236c50fca55SMasahiro Yamadaendif # BLOCK 237