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/ZNS host-managed and host-aware zoned block
  90         devices.
  91
  92         Say yes here if you have a ZAC, ZBC, or ZNS storage device.
  93
  94 config BLK_DEV_THROTTLING
  95         bool "Block layer bio throttling support"
  96         depends on BLK_CGROUP=y
  97         select BLK_CGROUP_RWSTAT
  98         help
  99         Block layer bio throttling support. It can be used to limit
 100         the IO rate to a device. IO rate policies are per cgroup and
 101         one needs to mount and use blkio cgroup controller for creating
 102         cgroups and specifying per device IO rate policies.
 103
 104         See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
 105
 106 config BLK_DEV_THROTTLING_LOW
 107         bool "Block throttling .low limit interface support (EXPERIMENTAL)"
 108         depends on BLK_DEV_THROTTLING
 109         help
 110         Add .low limit interface for block throttling. The low limit is a best
 111         effort limit to prioritize cgroups. Depending on the setting, the limit
 112         can be used to protect cgroups in terms of bandwidth/iops and better
 113         utilize disk resource.
 114
 115         Note, this is an experimental interface and could be changed someday.
 116
 117 config BLK_CMDLINE_PARSER
 118         bool "Block device command line partition parser"
 119         help
 120         Enabling this option allows you to specify the partition layout from
 121         the kernel boot args.  This is typically of use for embedded devices
 122         which don't otherwise have any standardized method for listing the
 123         partitions on a block device.
 124
 125         See Documentation/block/cmdline-partition.rst for more information.
 126
 127 config BLK_WBT
 128         bool "Enable support for block device writeback throttling"
 129         help
 130         Enabling this option enables the block layer to throttle buffered
 131         background writeback from the VM, making it more smooth and having
 132         less impact on foreground operations. The throttling is done
 133         dynamically on an algorithm loosely based on CoDel, factoring in
 134         the realtime performance of the disk.
 135
 136 config BLK_CGROUP_IOLATENCY
 137         bool "Enable support for latency based cgroup IO protection"
 138         depends on BLK_CGROUP=y
 139         help
 140         Enabling this option enables the .latency interface for IO throttling.
 141         The IO controller will attempt to maintain average IO latencies below
 142         the configured latency target, throttling anybody with a higher latency
 143         target than the victimized group.
 144
 145         Note, this is an experimental interface and could be changed someday.
 146
 147 config BLK_CGROUP_IOCOST
 148         bool "Enable support for cost model based cgroup IO controller"
 149         depends on BLK_CGROUP=y
 150         select BLK_RQ_IO_DATA_LEN
 151         select BLK_RQ_ALLOC_TIME
 152         help
 153         Enabling this option enables the .weight interface for cost
 154         model based proportional IO control.  The IO controller
 155         distributes IO capacity between different groups based on
 156         their share of the overall weight distribution.
 157
 158 config BLK_WBT_MQ
 159         bool "Multiqueue writeback throttling"
 160         default y
 161         depends on BLK_WBT
 162         help
 163         Enable writeback throttling by default on multiqueue devices.
 164         Multiqueue currently doesn't have support for IO scheduling,
 165         enabling this option is recommended.
 166
 167 config BLK_DEBUG_FS
 168         bool "Block layer debugging information in debugfs"
 169         default y
 170         depends on DEBUG_FS
 171         help
 172         Include block layer debugging information in debugfs. This information
 173         is mostly useful for kernel developers, but it doesn't incur any cost
 174         at runtime.
 175
 176         Unless you are building a kernel for a tiny system, you should
 177         say Y here.
 178
 179 config BLK_DEBUG_FS_ZONED
 180        bool
 181        default BLK_DEBUG_FS && BLK_DEV_ZONED
 182
 183 config BLK_SED_OPAL
 184         bool "Logic for interfacing with Opal enabled SEDs"
 185         help
 186         Builds Logic for interfacing with Opal enabled controllers.
 187         Enabling this option enables users to setup/unlock/lock
 188         Locking ranges for SED devices using the Opal protocol.
 189
 190 config BLK_INLINE_ENCRYPTION
 191         bool "Enable inline encryption support in block layer"
 192         help
 193           Build the blk-crypto subsystem. Enabling this lets the
 194           block layer handle encryption, so users can take
 195           advantage of inline encryption hardware if present.
 196
 197 config BLK_INLINE_ENCRYPTION_FALLBACK
 198         bool "Enable crypto API fallback for blk-crypto"
 199         depends on BLK_INLINE_ENCRYPTION
 200         select CRYPTO
 201         select CRYPTO_SKCIPHER
 202         help
 203           Enabling this lets the block layer handle inline encryption
 204           by falling back to the kernel crypto API when inline
 205           encryption hardware is not present.
 206
 207 menu "Partition Types"
 208
 209 source "block/partitions/Kconfig"
 210
 211 endmenu
 212
 213 endif # BLOCK
 214
 215 config BLOCK_COMPAT
 216         bool
 217         depends on BLOCK && COMPAT
 218         default y
 219
 220 config BLK_MQ_PCI
 221         bool
 222         depends on BLOCK && PCI
 223         default y
 224
 225 config BLK_MQ_VIRTIO
 226         bool
 227         depends on BLOCK && VIRTIO
 228         default y
 229
 230 config BLK_MQ_RDMA
 231         bool
 232         depends on BLOCK && INFINIBAND
 233         default y
 234
 235 config BLK_PM
 236         def_bool BLOCK && PM
 237
 238 source "block/Kconfig.iosched"