linux-imx/block/Kconfig

SPDX-License-Identifier: GPL-2.0

Block layer core configuration

menuconfig BLOCK bool "Enable the block layer" if EXPERT default y select SBITMAP select SRCU help Provide block layer support for the kernel.

 Disable this option to remove the block layer support from the
 kernel. This may be useful for embedded devices.

 If this option is disabled:

   - block device files will become unusable
   - some filesystems (such as ext3) will become unavailable.

 Also, SCSI character devices and USB storage will be disabled since
 they make use of various block layer definitions and facilities.

 Say Y here unless you know you really don't want to mount disks and
 suchlike.

if BLOCK

config BLK_RQ_ALLOC_TIME bool

config BLK_CGROUP_RWSTAT bool

config BLK_DEV_BSG_COMMON tristate

config BLK_DEV_BSGLIB bool "Block layer SG support v4 helper lib" select BLK_DEV_BSG_COMMON help Subsystems will normally enable this if needed. Users will not normally need to manually enable this.

  If unsure, say N.

config BLK_DEV_INTEGRITY bool "Block layer data integrity support" help Some storage devices allow extra information to be stored/retrieved to help protect the data. The block layer data integrity option provides hooks which can be used by filesystems to ensure better data integrity.

Say yes here if you have a storage device that provides the
T10/SCSI Data Integrity Field or the T13/ATA External Path
Protection.  If in doubt, say N.

config BLK_DEV_INTEGRITY_T10 tristate depends on BLK_DEV_INTEGRITY select CRC_T10DIF

config BLK_DEV_ZONED bool "Zoned block device support" select MQ_IOSCHED_DEADLINE help Block layer zoned block device support. This option enables support for ZAC/ZBC/ZNS host-managed and host-aware zoned block devices.

Say yes here if you have a ZAC, ZBC, or ZNS storage device.

config BLK_DEV_THROTTLING bool "Block layer bio throttling support" depends on BLK_CGROUP=y select BLK_CGROUP_RWSTAT help Block layer bio throttling support. It can be used to limit the IO rate to a device. IO rate policies are per cgroup and one needs to mount and use blkio cgroup controller for creating cgroups and specifying per device IO rate policies.

See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.

config BLK_DEV_THROTTLING_LOW bool "Block throttling .low limit interface support (EXPERIMENTAL)" depends on BLK_DEV_THROTTLING help Add .low limit interface for block throttling. The low limit is a best effort limit to prioritize cgroups. Depending on the setting, the limit can be used to protect cgroups in terms of bandwidth/iops and better utilize disk resource.

Note, this is an experimental interface and could be changed someday.

config BLK_WBT bool "Enable support for block device writeback throttling" help Enabling this option enables the block layer to throttle buffered background writeback from the VM, making it more smooth and having less impact on foreground operations. The throttling is done dynamically on an algorithm loosely based on CoDel, factoring in the realtime performance of the disk.

config BLK_WBT_MQ bool "Enable writeback throttling by default" default y depends on BLK_WBT help Enable writeback throttling by default for request-based block devices.

config BLK_CGROUP_IOLATENCY bool "Enable support for latency based cgroup IO protection" depends on BLK_CGROUP=y help Enabling this option enables the .latency interface for IO throttling. The IO controller will attempt to maintain average IO latencies below the configured latency target, throttling anybody with a higher latency target than the victimized group.

Note, this is an experimental interface and could be changed someday.

config BLK_CGROUP_FC_APPID bool "Enable support to track FC I/O Traffic across cgroup applications" depends on BLK_CGROUP && NVME_FC help Enabling this option enables the support to track FC I/O traffic across cgroup applications. It enables the Fabric and the storage targets to identify, monitor, and handle FC traffic based on VM tags by inserting application specific identification into the FC frame.

config BLK_CGROUP_IOCOST bool "Enable support for cost model based cgroup IO controller" depends on BLK_CGROUP=y select BLK_RQ_IO_DATA_LEN select BLK_RQ_ALLOC_TIME help Enabling this option enables the .weight interface for cost model based proportional IO control. The IO controller distributes IO capacity between different groups based on their share of the overall weight distribution.

config BLK_CGROUP_IOPRIO bool "Cgroup I/O controller for assigning an I/O priority class" depends on BLK_CGROUP help Enable the .prio interface for assigning an I/O priority class to requests. The I/O priority class affects the order in which an I/O scheduler and block devices process requests. Only some I/O schedulers and some block devices support I/O priorities.

config BLK_DEBUG_FS bool "Block layer debugging information in debugfs" default y depends on DEBUG_FS help Include block layer debugging information in debugfs. This information is mostly useful for kernel developers, but it doesn't incur any cost at runtime.

Unless you are building a kernel for a tiny system, you should
say Y here.

config BLK_DEBUG_FS_ZONED bool default BLK_DEBUG_FS && BLK_DEV_ZONED

config BLK_SED_OPAL bool "Logic for interfacing with Opal enabled SEDs" help Builds Logic for interfacing with Opal enabled controllers. Enabling this option enables users to setup/unlock/lock Locking ranges for SED devices using the Opal protocol.

config BLK_INLINE_ENCRYPTION bool "Enable inline encryption support in block layer" help Build the blk-crypto subsystem. Enabling this lets the block layer handle encryption, so users can take advantage of inline encryption hardware if present.

config BLK_INLINE_ENCRYPTION_FALLBACK bool "Enable crypto API fallback for blk-crypto" depends on BLK_INLINE_ENCRYPTION select CRYPTO select CRYPTO_SKCIPHER help Enabling this lets the block layer handle inline encryption by falling back to the kernel crypto API when inline encryption hardware is not present.

menu "Partition Types"

source "block/partitions/Kconfig"

endmenu

endif # BLOCK

config BLOCK_COMPAT bool depends on BLOCK && COMPAT default y

config BLK_MQ_PCI bool depends on BLOCK && PCI default y

config BLK_MQ_VIRTIO bool depends on BLOCK && VIRTIO default y

config BLK_MQ_RDMA bool depends on BLOCK && INFINIBAND default y

config BLK_PM def_bool BLOCK && PM

do not use in new code

config BLOCK_HOLDER_DEPRECATED bool

source "block/Kconfig.iosched"