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         ---help---
  70         Some storage devices allow extra information to be
  71         stored/retrieved to help protect the data.  The block layer
  72         data integrity option provides hooks which can be used by
  73         filesystems to ensure better data integrity.
  74
  75         Say yes here if you have a storage device that provides the
  76         T10/SCSI Data Integrity Field or the T13/ATA External Path
  77         Protection.  If in doubt, say N.
  78
  79 config BLK_DEV_INTEGRITY_T10
  80         tristate
  81         depends on BLK_DEV_INTEGRITY
  82         select CRC_T10DIF
  83
  84 config BLK_DEV_ZONED
  85         bool "Zoned block device support"
  86         select MQ_IOSCHED_DEADLINE
  87         ---help---
  88         Block layer zoned block device support. This option enables
  89         support for ZAC/ZBC host-managed and host-aware zoned block devices.
  90
  91         Say yes here if you have a ZAC or ZBC storage device.
  92
  93 config BLK_DEV_THROTTLING
  94         bool "Block layer bio throttling support"
  95         depends on BLK_CGROUP=y
  96         select BLK_CGROUP_RWSTAT
  97         ---help---
  98         Block layer bio throttling support. It can be used to limit
  99         the IO rate to a device. IO rate policies are per cgroup and
 100         one needs to mount and use blkio cgroup controller for creating
 101         cgroups and specifying per device IO rate policies.
 102
 103         See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
 104
 105 config BLK_DEV_THROTTLING_LOW
 106         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 107         depends on BLK_DEV_THROTTLING
 108         ---help---
 109         Add .low limit interface for block throttling. The low limit is a best
 110         effort limit to prioritize cgroups. Depending on the setting, the limit
 111         can be used to protect cgroups in terms of bandwidth/iops and better
 112         utilize disk resource.
 113
 114         Note, this is an experimental interface and could be changed someday.
 115
 116 config BLK_CMDLINE_PARSER
 117         bool "Block device command line partition parser"
 118         ---help---
 119         Enabling this option allows you to specify the partition layout from
 120         the kernel boot args.  This is typically of use for embedded devices
 121         which don't otherwise have any standardized method for listing the
 122         partitions on a block device.
 123
 124         See Documentation/block/cmdline-partition.rst for more information.
 125
 126 config BLK_WBT
 127         bool "Enable support for block device writeback throttling"
 128         ---help---
 129         Enabling this option enables the block layer to throttle buffered
 130         background writeback from the VM, making it more smooth and having
 131         less impact on foreground operations. The throttling is done
 132         dynamically on an algorithm loosely based on CoDel, factoring in
 133         the realtime performance of the disk.
 134
 135 config BLK_CGROUP_IOLATENCY
 136         bool "Enable support for latency based cgroup IO protection"
 137         depends on BLK_CGROUP=y
 138         ---help---
 139         Enabling this option enables the .latency interface for IO throttling.
 140         The IO controller will attempt to maintain average IO latencies below
 141         the configured latency target, throttling anybody with a higher latency
 142         target than the victimized group.
 143
 144         Note, this is an experimental interface and could be changed someday.
 145
 146 config BLK_CGROUP_IOCOST
 147         bool "Enable support for cost model based cgroup IO controller"
 148         depends on BLK_CGROUP=y
 149         select BLK_RQ_ALLOC_TIME
 150         ---help---
 151         Enabling this option enables the .weight interface for cost
 152         model based proportional IO control.  The IO controller
 153         distributes IO capacity between different groups based on
 154         their share of the overall weight distribution.
 155
 156 config BLK_WBT_MQ
 157         bool "Multiqueue writeback throttling"
 158         default y
 159         depends on BLK_WBT
 160         ---help---
 161         Enable writeback throttling by default on multiqueue devices.
 162         Multiqueue currently doesn't have support for IO scheduling,
 163         enabling this option is recommended.
 164
 165 config BLK_DEBUG_FS
 166         bool "Block layer debugging information in debugfs"
 167         default y
 168         depends on DEBUG_FS
 169         ---help---
 170         Include block layer debugging information in debugfs. This information
 171         is mostly useful for kernel developers, but it doesn't incur any cost
 172         at runtime.
 173
 174         Unless you are building a kernel for a tiny system, you should
 175         say Y here.
 176
 177 config BLK_DEBUG_FS_ZONED
 178        bool
 179        default BLK_DEBUG_FS && BLK_DEV_ZONED
 180
 181 config BLK_SED_OPAL
 182         bool "Logic for interfacing with Opal enabled SEDs"
 183         ---help---
 184         Builds Logic for interfacing with Opal enabled controllers.
 185         Enabling this option enables users to setup/unlock/lock
 186         Locking ranges for SED devices using the Opal protocol.
 187
 188 menu "Partition Types"
 189
 190 source "block/partitions/Kconfig"
 191
 192 endmenu
 193
 194 endif # BLOCK
 195
 196 config BLOCK_COMPAT
 197         bool
 198         depends on BLOCK && COMPAT
 199         default y
 200
 201 config BLK_MQ_PCI
 202         bool
 203         depends on BLOCK && PCI
 204         default y
 205
 206 config BLK_MQ_VIRTIO
 207         bool
 208         depends on BLOCK && VIRTIO
 209         default y
 210
 211 config BLK_MQ_RDMA
 212         bool
 213         depends on BLOCK && INFINIBAND
 214         default y
 215
 216 config BLK_PM
 217         def_bool BLOCK && PM
 218
 219 source "block/Kconfig.iosched"