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" 31451f0b6fSChristoph 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 36451f0b6fSChristoph Hellwig created on demand, but scripts that manually create device nodes and 37451f0b6fSChristoph 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 76*a7d4383fSKeith Busch select CRC64_ROCKSOFT 77a754bd5fSHerbert Xu 786a0cb1bcSHannes Reineckeconfig BLK_DEV_ZONED 796a0cb1bcSHannes Reinecke bool "Zoned block device support" 80b9aef63aSDamien Le Moal select MQ_IOSCHED_DEADLINE 81a7f7f624SMasahiro Yamada help 826a0cb1bcSHannes Reinecke Block layer zoned block device support. This option enables 83240e6ee2SKeith Busch support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 84240e6ee2SKeith Busch devices. 856a0cb1bcSHannes Reinecke 86240e6ee2SKeith Busch Say yes here if you have a ZAC, ZBC, or ZNS storage device. 876a0cb1bcSHannes Reinecke 88e43473b7SVivek Goyalconfig BLK_DEV_THROTTLING 89e43473b7SVivek Goyal bool "Block layer bio throttling support" 90df252bdeSMasahiro Yamada depends on BLK_CGROUP 911d156646STejun Heo select BLK_CGROUP_RWSTAT 92a7f7f624SMasahiro Yamada help 93e43473b7SVivek Goyal Block layer bio throttling support. It can be used to limit 94e43473b7SVivek Goyal the IO rate to a device. IO rate policies are per cgroup and 95e43473b7SVivek Goyal one needs to mount and use blkio cgroup controller for creating 96e43473b7SVivek Goyal cgroups and specifying per device IO rate policies. 97e43473b7SVivek Goyal 98da82c92fSMauro Carvalho Chehab See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 99e43473b7SVivek Goyal 100327ffb9bSShaohua Liconfig BLK_DEV_THROTTLING_LOW 101327ffb9bSShaohua Li bool "Block throttling .low limit interface support (EXPERIMENTAL)" 102327ffb9bSShaohua Li depends on BLK_DEV_THROTTLING 103a7f7f624SMasahiro Yamada help 104327ffb9bSShaohua Li Add .low limit interface for block throttling. The low limit is a best 105327ffb9bSShaohua Li effort limit to prioritize cgroups. Depending on the setting, the limit 106327ffb9bSShaohua Li can be used to protect cgroups in terms of bandwidth/iops and better 107327ffb9bSShaohua Li utilize disk resource. 108327ffb9bSShaohua Li 109327ffb9bSShaohua Li Note, this is an experimental interface and could be changed someday. 110327ffb9bSShaohua Li 11187760e5eSJens Axboeconfig BLK_WBT 11287760e5eSJens Axboe bool "Enable support for block device writeback throttling" 113a7f7f624SMasahiro Yamada help 11487760e5eSJens Axboe Enabling this option enables the block layer to throttle buffered 11587760e5eSJens Axboe background writeback from the VM, making it more smooth and having 11687760e5eSJens Axboe less impact on foreground operations. The throttling is done 11787760e5eSJens Axboe dynamically on an algorithm loosely based on CoDel, factoring in 11887760e5eSJens Axboe the realtime performance of the disk. 11987760e5eSJens Axboe 1205f6776baSBart Van Asscheconfig BLK_WBT_MQ 1215f6776baSBart Van Assche bool "Enable writeback throttling by default" 1225f6776baSBart Van Assche default y 1235f6776baSBart Van Assche depends on BLK_WBT 1245f6776baSBart Van Assche help 1255f6776baSBart Van Assche Enable writeback throttling by default for request-based block devices. 1265f6776baSBart Van Assche 127d7067512SJosef Bacikconfig BLK_CGROUP_IOLATENCY 128d7067512SJosef Bacik bool "Enable support for latency based cgroup IO protection" 129df252bdeSMasahiro Yamada depends on BLK_CGROUP 130a7f7f624SMasahiro Yamada help 131d7067512SJosef Bacik Enabling this option enables the .latency interface for IO throttling. 132d7067512SJosef Bacik The IO controller will attempt to maintain average IO latencies below 133d7067512SJosef Bacik the configured latency target, throttling anybody with a higher latency 134d7067512SJosef Bacik target than the victimized group. 135d7067512SJosef Bacik 136d7067512SJosef Bacik Note, this is an experimental interface and could be changed someday. 137d7067512SJosef Bacik 138d2bcbeabSMuneendra Kumarconfig BLK_CGROUP_FC_APPID 139d2bcbeabSMuneendra Kumar bool "Enable support to track FC I/O Traffic across cgroup applications" 140d2500a0cSMartin K. Petersen depends on BLK_CGROUP && NVME_FC 141d2bcbeabSMuneendra Kumar help 142d2bcbeabSMuneendra Kumar Enabling this option enables the support to track FC I/O traffic across 143d2bcbeabSMuneendra Kumar cgroup applications. It enables the Fabric and the storage targets to 144d2bcbeabSMuneendra Kumar identify, monitor, and handle FC traffic based on VM tags by inserting 145d2bcbeabSMuneendra Kumar application specific identification into the FC frame. 146d2bcbeabSMuneendra Kumar 1477caa4715STejun Heoconfig BLK_CGROUP_IOCOST 1487caa4715STejun Heo bool "Enable support for cost model based cgroup IO controller" 149df252bdeSMasahiro Yamada depends on BLK_CGROUP 150cd006509STejun Heo select BLK_RQ_IO_DATA_LEN 1517caa4715STejun Heo select BLK_RQ_ALLOC_TIME 152a7f7f624SMasahiro Yamada help 1537caa4715STejun Heo Enabling this option enables the .weight interface for cost 1547caa4715STejun Heo model based proportional IO control. The IO controller 1557caa4715STejun Heo distributes IO capacity between different groups based on 1567caa4715STejun Heo their share of the overall weight distribution. 1577caa4715STejun Heo 158556910e3SBart Van Asscheconfig BLK_CGROUP_IOPRIO 159556910e3SBart Van Assche bool "Cgroup I/O controller for assigning an I/O priority class" 160556910e3SBart Van Assche depends on BLK_CGROUP 161556910e3SBart Van Assche help 162556910e3SBart Van Assche Enable the .prio interface for assigning an I/O priority class to 163556910e3SBart Van Assche requests. The I/O priority class affects the order in which an I/O 164556910e3SBart Van Assche scheduler and block devices process requests. Only some I/O schedulers 165556910e3SBart Van Assche and some block devices support I/O priorities. 166556910e3SBart Van Assche 167400f73b2SOmar Sandovalconfig BLK_DEBUG_FS 168400f73b2SOmar Sandoval bool "Block layer debugging information in debugfs" 169400f73b2SOmar Sandoval default y 170400f73b2SOmar Sandoval depends on DEBUG_FS 171a7f7f624SMasahiro Yamada help 172400f73b2SOmar Sandoval Include block layer debugging information in debugfs. This information 173400f73b2SOmar Sandoval is mostly useful for kernel developers, but it doesn't incur any cost 174400f73b2SOmar Sandoval at runtime. 175400f73b2SOmar Sandoval 176400f73b2SOmar Sandoval Unless you are building a kernel for a tiny system, you should 177400f73b2SOmar Sandoval say Y here. 178400f73b2SOmar Sandoval 1796a5ac984SBart Van Asscheconfig BLK_DEBUG_FS_ZONED 1806a5ac984SBart Van Assche bool 1816a5ac984SBart Van Assche default BLK_DEBUG_FS && BLK_DEV_ZONED 1826a5ac984SBart Van Assche 183455a7b23SScott Bauerconfig BLK_SED_OPAL 184455a7b23SScott Bauer bool "Logic for interfacing with Opal enabled SEDs" 185a7f7f624SMasahiro Yamada help 186455a7b23SScott Bauer Builds Logic for interfacing with Opal enabled controllers. 187455a7b23SScott Bauer Enabling this option enables users to setup/unlock/lock 188455a7b23SScott Bauer Locking ranges for SED devices using the Opal protocol. 189455a7b23SScott Bauer 1901b262839SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION 1911b262839SSatya Tangirala bool "Enable inline encryption support in block layer" 1921b262839SSatya Tangirala help 1931b262839SSatya Tangirala Build the blk-crypto subsystem. Enabling this lets the 1941b262839SSatya Tangirala block layer handle encryption, so users can take 1951b262839SSatya Tangirala advantage of inline encryption hardware if present. 1961b262839SSatya Tangirala 197488f6682SSatya Tangiralaconfig BLK_INLINE_ENCRYPTION_FALLBACK 198488f6682SSatya Tangirala bool "Enable crypto API fallback for blk-crypto" 199488f6682SSatya Tangirala depends on BLK_INLINE_ENCRYPTION 200488f6682SSatya Tangirala select CRYPTO 201488f6682SSatya Tangirala select CRYPTO_SKCIPHER 202488f6682SSatya Tangirala help 203488f6682SSatya Tangirala Enabling this lets the block layer handle inline encryption 204488f6682SSatya Tangirala by falling back to the kernel crypto API when inline 205488f6682SSatya Tangirala encryption hardware is not present. 206488f6682SSatya Tangirala 2079be96f3fSAl Virosource "block/partitions/Kconfig" 2089be96f3fSAl Viro 20999874d50SJens Axboeconfig BLOCK_COMPAT 210c50fca55SMasahiro Yamada def_bool COMPAT 21199874d50SJens Axboe 2128ec2ef2bSStephen Rothwellconfig BLK_MQ_PCI 213c50fca55SMasahiro Yamada def_bool PCI 2148ec2ef2bSStephen Rothwell 21573473427SChristoph Hellwigconfig BLK_MQ_VIRTIO 21673473427SChristoph Hellwig bool 217c50fca55SMasahiro Yamada depends on VIRTIO 21873473427SChristoph Hellwig default y 21973473427SChristoph Hellwig 22024c5dc66SSagi Grimbergconfig BLK_MQ_RDMA 22124c5dc66SSagi Grimberg bool 222c50fca55SMasahiro Yamada depends on INFINIBAND 22324c5dc66SSagi Grimberg default y 22424c5dc66SSagi Grimberg 225bca6b067SBart Van Asscheconfig BLK_PM 226c50fca55SMasahiro Yamada def_bool PM 227bca6b067SBart Van Assche 228c66fd019SChristoph Hellwig# do not use in new code 229c66fd019SChristoph Hellwigconfig BLOCK_HOLDER_DEPRECATED 230c66fd019SChristoph Hellwig bool 231c66fd019SChristoph Hellwig 232248c7933SChristoph Hellwigconfig BLK_MQ_STACKING 233248c7933SChristoph Hellwig bool 234248c7933SChristoph Hellwig 2358636a1f9SMasahiro Yamadasource "block/Kconfig.iosched" 236c50fca55SMasahiro Yamada 237c50fca55SMasahiro Yamadaendif # BLOCK 238