block/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # Block layer core configuration
   4 #
   5 menuconfig 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
  27 if BLOCK
  28
  29 config BLK_RQ_ALLOC_TIME
  30         bool
  31
  32 config BLK_SCSI_REQUEST
  33         bool
  34
  35 config BLK_CGROUP_RWSTAT
  36         bool
  37
  38 config BLK_DEV_BSG
  39         bool "Block layer SG support v4"
  40         default y
  41         select BLK_SCSI_REQUEST
  42         help
  43           Saying Y here will enable generic SG (SCSI generic) v4 support
  44           for any block device.
  45
  46           Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
  47           can handle complicated SCSI commands: tagged variable length cdbs
  48           with bidirectional data transfers and generic request/response
  49           protocols (e.g. Task Management Functions and SMP in Serial
  50           Attached SCSI).
  51
  52           This option is required by recent UDEV versions to properly
  53           access device serial numbers, etc.
  54
  55           If unsure, say Y.
  56
  57 config BLK_DEV_BSGLIB
  58         bool "Block layer SG support v4 helper lib"
  59         select BLK_DEV_BSG
  60         select BLK_SCSI_REQUEST
  61         help
  62           Subsystems will normally enable this if needed. Users will not
  63           normally need to manually enable this.
  64
  65           If unsure, say N.
  66
  67 config BLK_DEV_INTEGRITY
  68         bool "Block layer data integrity support"
  69         select CRC_T10DIF if BLK_DEV_INTEGRITY
  70         ---help---
  71         Some storage devices allow extra information to be
  72         stored/retrieved to help protect the data.  The block layer
  73         data integrity option provides hooks which can be used by
  74         filesystems to ensure better data integrity.
  75
  76         Say yes here if you have a storage device that provides the
  77         T10/SCSI Data Integrity Field or the T13/ATA External Path
  78         Protection.  If in doubt, say N.
  79
  80 config BLK_DEV_ZONED
  81         bool "Zoned block device support"
  82         select MQ_IOSCHED_DEADLINE
  83         ---help---
  84         Block layer zoned block device support. This option enables
  85         support for ZAC/ZBC host-managed and host-aware zoned block devices.
  86
  87         Say yes here if you have a ZAC or ZBC storage device.
  88
  89 config BLK_DEV_THROTTLING
  90         bool "Block layer bio throttling support"
  91         depends on BLK_CGROUP=y
  92         select BLK_CGROUP_RWSTAT
  93         ---help---
  94         Block layer bio throttling support. It can be used to limit
  95         the IO rate to a device. IO rate policies are per cgroup and
  96         one needs to mount and use blkio cgroup controller for creating
  97         cgroups and specifying per device IO rate policies.
  98
  99         See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
 100
 101 config BLK_DEV_THROTTLING_LOW
 102         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 103         depends on BLK_DEV_THROTTLING
 104         ---help---
 105         Add .low limit interface for block throttling. The low limit is a best
 106         effort limit to prioritize cgroups. Depending on the setting, the limit
 107         can be used to protect cgroups in terms of bandwidth/iops and better
 108         utilize disk resource.
 109
 110         Note, this is an experimental interface and could be changed someday.
 111
 112 config BLK_CMDLINE_PARSER
 113         bool "Block device command line partition parser"
 114         ---help---
 115         Enabling this option allows you to specify the partition layout from
 116         the kernel boot args.  This is typically of use for embedded devices
 117         which don't otherwise have any standardized method for listing the
 118         partitions on a block device.
 119
 120         See Documentation/block/cmdline-partition.rst for more information.
 121
 122 config BLK_WBT
 123         bool "Enable support for block device writeback throttling"
 124         ---help---
 125         Enabling this option enables the block layer to throttle buffered
 126         background writeback from the VM, making it more smooth and having
 127         less impact on foreground operations. The throttling is done
 128         dynamically on an algorithm loosely based on CoDel, factoring in
 129         the realtime performance of the disk.
 130
 131 config BLK_CGROUP_IOLATENCY
 132         bool "Enable support for latency based cgroup IO protection"
 133         depends on BLK_CGROUP=y
 134         ---help---
 135         Enabling this option enables the .latency interface for IO throttling.
 136         The IO controller will attempt to maintain average IO latencies below
 137         the configured latency target, throttling anybody with a higher latency
 138         target than the victimized group.
 139
 140         Note, this is an experimental interface and could be changed someday.
 141
 142 config BLK_CGROUP_IOCOST
 143         bool "Enable support for cost model based cgroup IO controller"
 144         depends on BLK_CGROUP=y
 145         select BLK_RQ_ALLOC_TIME
 146         ---help---
 147         Enabling this option enables the .weight interface for cost
 148         model based proportional IO control.  The IO controller
 149         distributes IO capacity between different groups based on
 150         their share of the overall weight distribution.
 151
 152 config BLK_WBT_MQ
 153         bool "Multiqueue writeback throttling"
 154         default y
 155         depends on BLK_WBT
 156         ---help---
 157         Enable writeback throttling by default on multiqueue devices.
 158         Multiqueue currently doesn't have support for IO scheduling,
 159         enabling this option is recommended.
 160
 161 config BLK_DEBUG_FS
 162         bool "Block layer debugging information in debugfs"
 163         default y
 164         depends on DEBUG_FS
 165         ---help---
 166         Include block layer debugging information in debugfs. This information
 167         is mostly useful for kernel developers, but it doesn't incur any cost
 168         at runtime.
 169
 170         Unless you are building a kernel for a tiny system, you should
 171         say Y here.
 172
 173 config BLK_DEBUG_FS_ZONED
 174        bool
 175        default BLK_DEBUG_FS && BLK_DEV_ZONED
 176
 177 config BLK_SED_OPAL
 178         bool "Logic for interfacing with Opal enabled SEDs"
 179         ---help---
 180         Builds Logic for interfacing with Opal enabled controllers.
 181         Enabling this option enables users to setup/unlock/lock
 182         Locking ranges for SED devices using the Opal protocol.
 183
 184 menu "Partition Types"
 185
 186 source "block/partitions/Kconfig"
 187
 188 endmenu
 189
 190 endif # BLOCK
 191
 192 config BLOCK_COMPAT
 193         bool
 194         depends on BLOCK && COMPAT
 195         default y
 196
 197 config BLK_MQ_PCI
 198         bool
 199         depends on BLOCK && PCI
 200         default y
 201
 202 config BLK_MQ_VIRTIO
 203         bool
 204         depends on BLOCK && VIRTIO
 205         default y
 206
 207 config BLK_MQ_RDMA
 208         bool
 209         depends on BLOCK && INFINIBAND
 210         default y
 211
 212 config BLK_PM
 213         def_bool BLOCK && PM
 214
 215 source "block/Kconfig.iosched"