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_CGROUP_RWSTAT 33 bool 34 35config BLK_DEV_BSG_COMMON 36 tristate 37 38config BLK_DEV_BSGLIB 39 bool "Block layer SG support v4 helper lib" 40 select BLK_DEV_BSG_COMMON 41 help 42 Subsystems will normally enable this if needed. Users will not 43 normally need to manually enable this. 44 45 If unsure, say N. 46 47config BLK_DEV_INTEGRITY 48 bool "Block layer data integrity support" 49 help 50 Some storage devices allow extra information to be 51 stored/retrieved to help protect the data. The block layer 52 data integrity option provides hooks which can be used by 53 filesystems to ensure better data integrity. 54 55 Say yes here if you have a storage device that provides the 56 T10/SCSI Data Integrity Field or the T13/ATA External Path 57 Protection. If in doubt, say N. 58 59config BLK_DEV_INTEGRITY_T10 60 tristate 61 depends on BLK_DEV_INTEGRITY 62 select CRC_T10DIF 63 64config BLK_DEV_ZONED 65 bool "Zoned block device support" 66 select MQ_IOSCHED_DEADLINE 67 help 68 Block layer zoned block device support. This option enables 69 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block 70 devices. 71 72 Say yes here if you have a ZAC, ZBC, or ZNS storage device. 73 74config BLK_DEV_THROTTLING 75 bool "Block layer bio throttling support" 76 depends on BLK_CGROUP=y 77 select BLK_CGROUP_RWSTAT 78 help 79 Block layer bio throttling support. It can be used to limit 80 the IO rate to a device. IO rate policies are per cgroup and 81 one needs to mount and use blkio cgroup controller for creating 82 cgroups and specifying per device IO rate policies. 83 84 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. 85 86config BLK_DEV_THROTTLING_LOW 87 bool "Block throttling .low limit interface support (EXPERIMENTAL)" 88 depends on BLK_DEV_THROTTLING 89 help 90 Add .low limit interface for block throttling. The low limit is a best 91 effort limit to prioritize cgroups. Depending on the setting, the limit 92 can be used to protect cgroups in terms of bandwidth/iops and better 93 utilize disk resource. 94 95 Note, this is an experimental interface and could be changed someday. 96 97config BLK_CMDLINE_PARSER 98 bool "Block device command line partition parser" 99 help 100 Enabling this option allows you to specify the partition layout from 101 the kernel boot args. This is typically of use for embedded devices 102 which don't otherwise have any standardized method for listing the 103 partitions on a block device. 104 105 See Documentation/block/cmdline-partition.rst for more information. 106 107config BLK_WBT 108 bool "Enable support for block device writeback throttling" 109 help 110 Enabling this option enables the block layer to throttle buffered 111 background writeback from the VM, making it more smooth and having 112 less impact on foreground operations. The throttling is done 113 dynamically on an algorithm loosely based on CoDel, factoring in 114 the realtime performance of the disk. 115 116config BLK_WBT_MQ 117 bool "Enable writeback throttling by default" 118 default y 119 depends on BLK_WBT 120 help 121 Enable writeback throttling by default for request-based block devices. 122 123config 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 134config BLK_CGROUP_FC_APPID 135 bool "Enable support to track FC I/O Traffic across cgroup applications" 136 depends on BLK_CGROUP && NVME_FC 137 help 138 Enabling this option enables the support to track FC I/O traffic across 139 cgroup applications. It enables the Fabric and the storage targets to 140 identify, monitor, and handle FC traffic based on VM tags by inserting 141 application specific identification into the FC frame. 142 143config BLK_CGROUP_IOCOST 144 bool "Enable support for cost model based cgroup IO controller" 145 depends on BLK_CGROUP=y 146 select BLK_RQ_IO_DATA_LEN 147 select BLK_RQ_ALLOC_TIME 148 help 149 Enabling this option enables the .weight interface for cost 150 model based proportional IO control. The IO controller 151 distributes IO capacity between different groups based on 152 their share of the overall weight distribution. 153 154config BLK_CGROUP_IOPRIO 155 bool "Cgroup I/O controller for assigning an I/O priority class" 156 depends on BLK_CGROUP 157 help 158 Enable the .prio interface for assigning an I/O priority class to 159 requests. The I/O priority class affects the order in which an I/O 160 scheduler and block devices process requests. Only some I/O schedulers 161 and some block devices support I/O priorities. 162 163config BLK_DEBUG_FS 164 bool "Block layer debugging information in debugfs" 165 default y 166 depends on DEBUG_FS 167 help 168 Include block layer debugging information in debugfs. This information 169 is mostly useful for kernel developers, but it doesn't incur any cost 170 at runtime. 171 172 Unless you are building a kernel for a tiny system, you should 173 say Y here. 174 175config BLK_DEBUG_FS_ZONED 176 bool 177 default BLK_DEBUG_FS && BLK_DEV_ZONED 178 179config BLK_SED_OPAL 180 bool "Logic for interfacing with Opal enabled SEDs" 181 help 182 Builds Logic for interfacing with Opal enabled controllers. 183 Enabling this option enables users to setup/unlock/lock 184 Locking ranges for SED devices using the Opal protocol. 185 186config BLK_INLINE_ENCRYPTION 187 bool "Enable inline encryption support in block layer" 188 help 189 Build the blk-crypto subsystem. Enabling this lets the 190 block layer handle encryption, so users can take 191 advantage of inline encryption hardware if present. 192 193config BLK_INLINE_ENCRYPTION_FALLBACK 194 bool "Enable crypto API fallback for blk-crypto" 195 depends on BLK_INLINE_ENCRYPTION 196 select CRYPTO 197 select CRYPTO_SKCIPHER 198 help 199 Enabling this lets the block layer handle inline encryption 200 by falling back to the kernel crypto API when inline 201 encryption hardware is not present. 202 203menu "Partition Types" 204 205source "block/partitions/Kconfig" 206 207endmenu 208 209endif # BLOCK 210 211config BLOCK_COMPAT 212 bool 213 depends on BLOCK && COMPAT 214 default y 215 216config BLK_MQ_PCI 217 bool 218 depends on BLOCK && PCI 219 default y 220 221config BLK_MQ_VIRTIO 222 bool 223 depends on BLOCK && VIRTIO 224 default y 225 226config BLK_MQ_RDMA 227 bool 228 depends on BLOCK && INFINIBAND 229 default y 230 231config BLK_PM 232 def_bool BLOCK && PM 233 234source "block/Kconfig.iosched" 235