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_SCSI_REQUEST
  30         bool
  31
  32 config 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
  51 config 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
  61 config 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
  74 config BLK_DEV_ZONED
  75         bool "Zoned block device support"
  76         ---help---
  77         Block layer zoned block device support. This option enables
  78         support for ZAC/ZBC host-managed and host-aware zoned block devices.
  79
  80         Say yes here if you have a ZAC or ZBC storage device.
  81
  82 config BLK_DEV_THROTTLING
  83         bool "Block layer bio throttling support"
  84         depends on BLK_CGROUP=y
  85         ---help---
  86         Block layer bio throttling support. It can be used to limit
  87         the IO rate to a device. IO rate policies are per cgroup and
  88         one needs to mount and use blkio cgroup controller for creating
  89         cgroups and specifying per device IO rate policies.
  90
  91         See Documentation/cgroup-v1/blkio-controller.txt for more information.
  92
  93 config BLK_DEV_THROTTLING_LOW
  94         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
  95         depends on BLK_DEV_THROTTLING
  96         ---help---
  97         Add .low limit interface for block throttling. The low limit is a best
  98         effort limit to prioritize cgroups. Depending on the setting, the limit
  99         can be used to protect cgroups in terms of bandwidth/iops and better
 100         utilize disk resource.
 101
 102         Note, this is an experimental interface and could be changed someday.
 103
 104 config BLK_CMDLINE_PARSER
 105         bool "Block device command line partition parser"
 106         ---help---
 107         Enabling this option allows you to specify the partition layout from
 108         the kernel boot args.  This is typically of use for embedded devices
 109         which don't otherwise have any standardized method for listing the
 110         partitions on a block device.
 111
 112         See Documentation/block/cmdline-partition.txt for more information.
 113
 114 config BLK_WBT
 115         bool "Enable support for block device writeback throttling"
 116         ---help---
 117         Enabling this option enables the block layer to throttle buffered
 118         background writeback from the VM, making it more smooth and having
 119         less impact on foreground operations. The throttling is done
 120         dynamically on an algorithm loosely based on CoDel, factoring in
 121         the realtime performance of the disk.
 122
 123 config BLK_CGROUP_IOLATENCY
 124         bool "Enable support for latency based cgroup IO protection"
 125         depends on BLK_CGROUP=y
 126         ---help---
 127         Enabling this option enables the .latency interface for IO throttling.
 128         The IO controller will attempt to maintain average IO latencies below
 129         the configured latency target, throttling anybody with a higher latency
 130         target than the victimized group.
 131
 132         Note, this is an experimental interface and could be changed someday.
 133
 134 config BLK_WBT_MQ
 135         bool "Multiqueue writeback throttling"
 136         default y
 137         depends on BLK_WBT
 138         ---help---
 139         Enable writeback throttling by default on multiqueue devices.
 140         Multiqueue currently doesn't have support for IO scheduling,
 141         enabling this option is recommended.
 142
 143 config BLK_DEBUG_FS
 144         bool "Block layer debugging information in debugfs"
 145         default y
 146         depends on DEBUG_FS
 147         ---help---
 148         Include block layer debugging information in debugfs. This information
 149         is mostly useful for kernel developers, but it doesn't incur any cost
 150         at runtime.
 151
 152         Unless you are building a kernel for a tiny system, you should
 153         say Y here.
 154
 155 config BLK_DEBUG_FS_ZONED
 156        bool
 157        default BLK_DEBUG_FS && BLK_DEV_ZONED
 158
 159 config BLK_SED_OPAL
 160         bool "Logic for interfacing with Opal enabled SEDs"
 161         ---help---
 162         Builds Logic for interfacing with Opal enabled controllers.
 163         Enabling this option enables users to setup/unlock/lock
 164         Locking ranges for SED devices using the Opal protocol.
 165
 166 menu "Partition Types"
 167
 168 source "block/partitions/Kconfig"
 169
 170 endmenu
 171
 172 endif # BLOCK
 173
 174 config BLOCK_COMPAT
 175         bool
 176         depends on BLOCK && COMPAT
 177         default y
 178
 179 config BLK_MQ_PCI
 180         bool
 181         depends on BLOCK && PCI
 182         default y
 183
 184 config BLK_MQ_VIRTIO
 185         bool
 186         depends on BLOCK && VIRTIO
 187         default y
 188
 189 config BLK_MQ_RDMA
 190         bool
 191         depends on BLOCK && INFINIBAND
 192         default y
 193
 194 config BLK_PM
 195         def_bool BLOCK && PM
 196
 197 source "block/Kconfig.iosched"