1# SPDX-License-Identifier: GPL-2.0 2# 3# Block layer core configuration 4# 5menuconfig 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 27if BLOCK 28 29config BLK_RQ_ALLOC_TIME 30 bool 31 32config BLK_SCSI_REQUEST 33 bool 34 35config BLK_CGROUP_RWSTAT 36 bool 37 38config 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 57config 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 67config 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 79config BLK_DEV_INTEGRITY_T10 80 tristate 81 depends on BLK_DEV_INTEGRITY 82 select CRC_T10DIF 83 84config 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 94config 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 106config 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 117config 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 127config 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 136config 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 143config 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 154config 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 163config 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 174config 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 183config 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 195config BLK_DEBUG_FS_ZONED 196 bool 197 default BLK_DEBUG_FS && BLK_DEV_ZONED 198 199config 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 206config 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 213config 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 223menu "Partition Types" 224 225source "block/partitions/Kconfig" 226 227endmenu 228 229endif # BLOCK 230 231config BLOCK_COMPAT 232 bool 233 depends on BLOCK && COMPAT 234 default y 235 236config BLK_MQ_PCI 237 bool 238 depends on BLOCK && PCI 239 default y 240 241config BLK_MQ_VIRTIO 242 bool 243 depends on BLOCK && VIRTIO 244 default y 245 246config BLK_MQ_RDMA 247 bool 248 depends on BLOCK && INFINIBAND 249 default y 250 251config BLK_PM 252 def_bool BLOCK && PM 253 254source "block/Kconfig.iosched" 255