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         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
  83 config 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/admin-guide/cgroup-v1/blkio-controller.rst for more information.
  93
  94 config 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
 105 config 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.rst for more information.
 114
 115 config 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
 124 config 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
 135 config 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
 144 config 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
 156 config BLK_DEBUG_FS_ZONED
 157        bool
 158        default BLK_DEBUG_FS && BLK_DEV_ZONED
 159
 160 config 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
 167 menu "Partition Types"
 168
 169 source "block/partitions/Kconfig"
 170
 171 endmenu
 172
 173 endif # BLOCK
 174
 175 config BLOCK_COMPAT
 176         bool
 177         depends on BLOCK && COMPAT
 178         default y
 179
 180 config BLK_MQ_PCI
 181         bool
 182         depends on BLOCK && PCI
 183         default y
 184
 185 config BLK_MQ_VIRTIO
 186         bool
 187         depends on BLOCK && VIRTIO
 188         default y
 189
 190 config BLK_MQ_RDMA
 191         bool
 192         depends on BLOCK && INFINIBAND
 193         default y
 194
 195 config BLK_PM
 196         def_bool BLOCK && PM
 197
 198 source "block/Kconfig.iosched"