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-rw-r--r--block/Kconfig236
-rw-r--r--block/Kconfig.iosched46
2 files changed, 282 insertions, 0 deletions
diff --git a/block/Kconfig b/block/Kconfig
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+# 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 BLOCK_LEGACY_AUTOLOAD
+ bool "Legacy autoloading support"
+ default y
+ help
+ Enable loading modules and creating block device instances based on
+ accesses through their device special file. This is a historic Linux
+ feature and makes no sense in a udev world where device files are
+ created on demand, but scripts that manually create device nodes and
+ then call losetup might rely on this behavior.
+
+config BLK_RQ_ALLOC_TIME
+ bool
+
+config BLK_CGROUP_RWSTAT
+ bool
+
+config BLK_DEV_BSG_COMMON
+ tristate
+
+config BLK_ICQ
+ bool
+
+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
+ select CRC64_ROCKSOFT
+
+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
+ 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
+ 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
+ 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.
+
+source "block/partitions/Kconfig"
+
+config BLOCK_COMPAT
+ def_bool COMPAT
+
+config BLK_MQ_PCI
+ def_bool PCI
+
+config BLK_MQ_VIRTIO
+ bool
+ depends on VIRTIO
+ default y
+
+config BLK_MQ_RDMA
+ bool
+ depends on INFINIBAND
+ default y
+
+config BLK_PM
+ def_bool PM
+
+# do not use in new code
+config BLOCK_HOLDER_DEPRECATED
+ bool
+
+config BLK_MQ_STACKING
+ bool
+
+source "block/Kconfig.iosched"
+
+endif # BLOCK
diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
new file mode 100644
index 000000000..615516146
--- /dev/null
+++ b/block/Kconfig.iosched
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: GPL-2.0
+menu "IO Schedulers"
+
+config MQ_IOSCHED_DEADLINE
+ tristate "MQ deadline I/O scheduler"
+ default y
+ help
+ MQ version of the deadline IO scheduler.
+
+config MQ_IOSCHED_KYBER
+ tristate "Kyber I/O scheduler"
+ default y
+ help
+ The Kyber I/O scheduler is a low-overhead scheduler suitable for
+ multiqueue and other fast devices. Given target latencies for reads and
+ synchronous writes, it will self-tune queue depths to achieve that
+ goal.
+
+config IOSCHED_BFQ
+ tristate "BFQ I/O scheduler"
+ select BLK_ICQ
+ help
+ BFQ I/O scheduler for BLK-MQ. BFQ distributes the bandwidth of
+ of the device among all processes according to their weights,
+ regardless of the device parameters and with any workload. It
+ also guarantees a low latency to interactive and soft
+ real-time applications. Details in
+ Documentation/block/bfq-iosched.rst
+
+config BFQ_GROUP_IOSCHED
+ bool "BFQ hierarchical scheduling support"
+ depends on IOSCHED_BFQ && BLK_CGROUP
+ select BLK_CGROUP_RWSTAT
+ help
+
+ Enable hierarchical scheduling in BFQ, using the blkio
+ (cgroups-v1) or io (cgroups-v2) controller.
+
+config BFQ_CGROUP_DEBUG
+ bool "BFQ IO controller debugging"
+ depends on BFQ_GROUP_IOSCHED
+ help
+ Enable some debugging help. Currently it exports additional stat
+ files in a cgroup which can be useful for debugging.
+
+endmenu