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_WBT_MQ
 137         bool "Enable writeback throttling by default"
 138         default y
 139         depends on BLK_WBT
 140         help
 141         Enable writeback throttling by default for request-based block devices.
 142
 143 config BLK_CGROUP_IOLATENCY
 144         bool "Enable support for latency based cgroup IO protection"
 145         depends on BLK_CGROUP=y
 146         help
 147         Enabling this option enables the .latency interface for IO throttling.
 148         The IO controller will attempt to maintain average IO latencies below
 149         the configured latency target, throttling anybody with a higher latency
 150         target than the victimized group.
 151
 152         Note, this is an experimental interface and could be changed someday.
 153
 154 config BLK_CGROUP_FC_APPID
 155         bool "Enable support to track FC I/O Traffic across cgroup applications"
 156         depends on BLK_CGROUP && NVME_FC
 157         help
 158           Enabling this option enables the support to track FC I/O traffic across
 159           cgroup applications. It enables the Fabric and the storage targets to
 160           identify, monitor, and handle FC traffic based on VM tags by inserting
 161           application specific identification into the FC frame.
 162
 163 config BLK_CGROUP_IOCOST
 164         bool "Enable support for cost model based cgroup IO controller"
 165         depends on BLK_CGROUP=y
 166         select BLK_RQ_IO_DATA_LEN
 167         select BLK_RQ_ALLOC_TIME
 168         help
 169         Enabling this option enables the .weight interface for cost
 170         model based proportional IO control.  The IO controller
 171         distributes IO capacity between different groups based on
 172         their share of the overall weight distribution.
 173
 174 config BLK_CGROUP_IOPRIO
 175         bool "Cgroup I/O controller for assigning an I/O priority class"
 176         depends on BLK_CGROUP
 177         help
 178         Enable the .prio interface for assigning an I/O priority class to
 179         requests. The I/O priority class affects the order in which an I/O
 180         scheduler and block devices process requests. Only some I/O schedulers
 181         and some block devices support I/O priorities.
 182
 183 config BLK_DEBUG_FS
 184         bool "Block layer debugging information in debugfs"
 185         default y
 186         depends on DEBUG_FS
 187         help
 188         Include block layer debugging information in debugfs. This information
 189         is mostly useful for kernel developers, but it doesn't incur any cost
 190         at runtime.
 191
 192         Unless you are building a kernel for a tiny system, you should
 193         say Y here.
 194
 195 config BLK_DEBUG_FS_ZONED
 196        bool
 197        default BLK_DEBUG_FS && BLK_DEV_ZONED
 198
 199 config BLK_SED_OPAL
 200         bool "Logic for interfacing with Opal enabled SEDs"
 201         help
 202         Builds Logic for interfacing with Opal enabled controllers.
 203         Enabling this option enables users to setup/unlock/lock
 204         Locking ranges for SED devices using the Opal protocol.
 205
 206 config BLK_INLINE_ENCRYPTION
 207         bool "Enable inline encryption support in block layer"
 208         help
 209           Build the blk-crypto subsystem. Enabling this lets the
 210           block layer handle encryption, so users can take
 211           advantage of inline encryption hardware if present.
 212
 213 config BLK_INLINE_ENCRYPTION_FALLBACK
 214         bool "Enable crypto API fallback for blk-crypto"
 215         depends on BLK_INLINE_ENCRYPTION
 216         select CRYPTO
 217         select CRYPTO_SKCIPHER
 218         help
 219           Enabling this lets the block layer handle inline encryption
 220           by falling back to the kernel crypto API when inline
 221           encryption hardware is not present.
 222
 223 menu "Partition Types"
 224
 225 source "block/partitions/Kconfig"
 226
 227 endmenu
 228
 229 endif # BLOCK
 230
 231 config BLOCK_COMPAT
 232         bool
 233         depends on BLOCK && COMPAT
 234         default y
 235
 236 config BLK_MQ_PCI
 237         bool
 238         depends on BLOCK && PCI
 239         default y
 240
 241 config BLK_MQ_VIRTIO
 242         bool
 243         depends on BLOCK && VIRTIO
 244         default y
 245
 246 config BLK_MQ_RDMA
 247         bool
 248         depends on BLOCK && INFINIBAND
 249         default y
 250
 251 config BLK_PM
 252         def_bool BLOCK && PM
 253
 254 source "block/Kconfig.iosched"