linux/block/Kconfig
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   1# SPDX-License-Identifier: GPL-2.0
   2#
   3# Block layer core configuration
   4#
   5menuconfig BLOCK
   6       bool "Enable the block layer" if EXPERT
   7       default y
   8       select SBITMAP
   9       select SRCU
  10       help
  11         Provide block layer support for the kernel.
  12
  13         Disable this option to remove the block layer support from the
  14         kernel. This may be useful for embedded devices.
  15
  16         If this option is disabled:
  17
  18           - block device files will become unusable
  19           - some filesystems (such as ext3) will become unavailable.
  20
  21         Also, SCSI character devices and USB storage will be disabled since
  22         they make use of various block layer definitions and facilities.
  23
  24         Say Y here unless you know you really don't want to mount disks and
  25         suchlike.
  26
  27if BLOCK
  28
  29config BLK_SCSI_REQUEST
  30        bool
  31
  32config BLK_DEV_BSG
  33        bool "Block layer SG support v4"
  34        default y
  35        select BLK_SCSI_REQUEST
  36        help
  37          Saying Y here will enable generic SG (SCSI generic) v4 support
  38          for any block device.
  39
  40          Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  41          can handle complicated SCSI commands: tagged variable length cdbs
  42          with bidirectional data transfers and generic request/response
  43          protocols (e.g. Task Management Functions and SMP in Serial
  44          Attached SCSI).
  45
  46          This option is required by recent UDEV versions to properly
  47          access device serial numbers, etc.
  48
  49          If unsure, say Y.
  50
  51config BLK_DEV_BSGLIB
  52        bool "Block layer SG support v4 helper lib"
  53        select BLK_DEV_BSG
  54        select BLK_SCSI_REQUEST
  55        help
  56          Subsystems will normally enable this if needed. Users will not
  57          normally need to manually enable this.
  58
  59          If unsure, say N.
  60
  61config BLK_DEV_INTEGRITY
  62        bool "Block layer data integrity support"
  63        select CRC_T10DIF if BLK_DEV_INTEGRITY
  64        ---help---
  65        Some storage devices allow extra information to be
  66        stored/retrieved to help protect the data.  The block layer
  67        data integrity option provides hooks which can be used by
  68        filesystems to ensure better data integrity.
  69
  70        Say yes here if you have a storage device that provides the
  71        T10/SCSI Data Integrity Field or the T13/ATA External Path
  72        Protection.  If in doubt, say N.
  73
  74config BLK_DEV_ZONED
  75        bool "Zoned block device support"
  76        select MQ_IOSCHED_DEADLINE
  77        ---help---
  78        Block layer zoned block device support. This option enables
  79        support for ZAC/ZBC host-managed and host-aware zoned block devices.
  80
  81        Say yes here if you have a ZAC or ZBC storage device.
  82
  83config BLK_DEV_THROTTLING
  84        bool "Block layer bio throttling support"
  85        depends on BLK_CGROUP=y
  86        ---help---
  87        Block layer bio throttling support. It can be used to limit
  88        the IO rate to a device. IO rate policies are per cgroup and
  89        one needs to mount and use blkio cgroup controller for creating
  90        cgroups and specifying per device IO rate policies.
  91
  92        See Documentation/cgroup-v1/blkio-controller.txt for more information.
  93
  94config BLK_DEV_THROTTLING_LOW
  95        bool "Block throttling .low limit interface support (EXPERIMENTAL)"
  96        depends on BLK_DEV_THROTTLING
  97        ---help---
  98        Add .low limit interface for block throttling. The low limit is a best
  99        effort limit to prioritize cgroups. Depending on the setting, the limit
 100        can be used to protect cgroups in terms of bandwidth/iops and better
 101        utilize disk resource.
 102
 103        Note, this is an experimental interface and could be changed someday.
 104
 105config BLK_CMDLINE_PARSER
 106        bool "Block device command line partition parser"
 107        ---help---
 108        Enabling this option allows you to specify the partition layout from
 109        the kernel boot args.  This is typically of use for embedded devices
 110        which don't otherwise have any standardized method for listing the
 111        partitions on a block device.
 112
 113        See Documentation/block/cmdline-partition.txt for more information.
 114
 115config BLK_WBT
 116        bool "Enable support for block device writeback throttling"
 117        ---help---
 118        Enabling this option enables the block layer to throttle buffered
 119        background writeback from the VM, making it more smooth and having
 120        less impact on foreground operations. The throttling is done
 121        dynamically on an algorithm loosely based on CoDel, factoring in
 122        the realtime performance of the disk.
 123
 124config BLK_CGROUP_IOLATENCY
 125        bool "Enable support for latency based cgroup IO protection"
 126        depends on BLK_CGROUP=y
 127        ---help---
 128        Enabling this option enables the .latency interface for IO throttling.
 129        The IO controller will attempt to maintain average IO latencies below
 130        the configured latency target, throttling anybody with a higher latency
 131        target than the victimized group.
 132
 133        Note, this is an experimental interface and could be changed someday.
 134
 135config BLK_WBT_MQ
 136        bool "Multiqueue writeback throttling"
 137        default y
 138        depends on BLK_WBT
 139        ---help---
 140        Enable writeback throttling by default on multiqueue devices.
 141        Multiqueue currently doesn't have support for IO scheduling,
 142        enabling this option is recommended.
 143
 144config BLK_DEBUG_FS
 145        bool "Block layer debugging information in debugfs"
 146        default y
 147        depends on DEBUG_FS
 148        ---help---
 149        Include block layer debugging information in debugfs. This information
 150        is mostly useful for kernel developers, but it doesn't incur any cost
 151        at runtime.
 152
 153        Unless you are building a kernel for a tiny system, you should
 154        say Y here.
 155
 156config BLK_DEBUG_FS_ZONED
 157       bool
 158       default BLK_DEBUG_FS && BLK_DEV_ZONED
 159
 160config BLK_SED_OPAL
 161        bool "Logic for interfacing with Opal enabled SEDs"
 162        ---help---
 163        Builds Logic for interfacing with Opal enabled controllers.
 164        Enabling this option enables users to setup/unlock/lock
 165        Locking ranges for SED devices using the Opal protocol.
 166
 167menu "Partition Types"
 168
 169source "block/partitions/Kconfig"
 170
 171endmenu
 172
 173endif # BLOCK
 174
 175config BLOCK_COMPAT
 176        bool
 177        depends on BLOCK && COMPAT
 178        default y
 179
 180config BLK_MQ_PCI
 181        bool
 182        depends on BLOCK && PCI
 183        default y
 184
 185config BLK_MQ_VIRTIO
 186        bool
 187        depends on BLOCK && VIRTIO
 188        default y
 189
 190config BLK_MQ_RDMA
 191        bool
 192        depends on BLOCK && INFINIBAND
 193        default y
 194
 195config BLK_PM
 196        def_bool BLOCK && PM
 197
 198source "block/Kconfig.iosched"
 199