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Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001# SPDX-License-Identifier: GPL-2.0
Jens Axboe3a65dfe2005-11-04 08:43:35 +01002#
3# Block layer core configuration
4#
Jan Engelhardt16ed0022007-07-10 12:24:11 +02005menuconfig BLOCK
David Rientjes6a108a12011-01-20 14:44:16 -08006 bool "Enable the block layer" if EXPERT
David Howells93614012006-09-30 20:45:40 +02007 default y
Omar Sandoval88459642016-09-17 08:38:44 -06008 select SBITMAP
David Howells93614012006-09-30 20:45:40 +02009 help
Nick Andrewee864182008-04-21 09:51:04 +020010 Provide block layer support for the kernel.
David Howells93614012006-09-30 20:45:40 +020011
Nick Andrewee864182008-04-21 09:51:04 +020012 Disable this option to remove the block layer support from the
13 kernel. This may be useful for embedded devices.
14
15 If this option is disabled:
16
17 - block device files will become unusable
18 - some filesystems (such as ext3) will become unavailable.
19
20 Also, SCSI character devices and USB storage will be disabled since
21 they make use of various block layer definitions and facilities.
David Howells93614012006-09-30 20:45:40 +020022
23 Say Y here unless you know you really don't want to mount disks and
24 suchlike.
25
26if BLOCK
27
Christoph Hellwigfbdee712022-01-04 08:16:47 +010028config BLOCK_LEGACY_AUTOLOAD
29 bool "Legacy autoloading support"
Christoph Hellwig451f0b62022-02-25 19:14:40 +010030 default y
Christoph Hellwigfbdee712022-01-04 08:16:47 +010031 help
32 Enable loading modules and creating block device instances based on
33 accesses through their device special file. This is a historic Linux
34 feature and makes no sense in a udev world where device files are
Christoph Hellwig451f0b62022-02-25 19:14:40 +010035 created on demand, but scripts that manually create device nodes and
36 then call losetup might rely on this behavior.
Christoph Hellwigfbdee712022-01-04 08:16:47 +010037
Tejun Heo6f816b42019-08-28 15:05:57 -070038config BLK_RQ_ALLOC_TIME
39 bool
40
Tejun Heo1d1566462019-11-07 11:18:04 -080041config BLK_CGROUP_RWSTAT
42 bool
43
Christoph Hellwig2c275af2023-03-27 09:49:53 +090044config BLK_CGROUP_PUNT_BIO
45 bool
46
Christoph Hellwig78011042021-07-24 09:20:23 +020047config BLK_DEV_BSG_COMMON
48 tristate
Jens Axboe3d6392c2007-07-09 12:38:05 +020049
Christoph Hellwig5ef16302021-12-09 07:31:31 +010050config BLK_ICQ
51 bool
52
Mike Christieaa387cc2011-07-31 22:05:09 +020053config BLK_DEV_BSGLIB
54 bool "Block layer SG support v4 helper lib"
Christoph Hellwig78011042021-07-24 09:20:23 +020055 select BLK_DEV_BSG_COMMON
Mike Christieaa387cc2011-07-31 22:05:09 +020056 help
57 Subsystems will normally enable this if needed. Users will not
58 normally need to manually enable this.
59
60 If unsure, say N.
61
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020062config BLK_DEV_INTEGRITY
63 bool "Block layer data integrity support"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +090064 help
Martin K. Petersen7ba1ba12008-06-30 20:04:41 +020065 Some storage devices allow extra information to be
66 stored/retrieved to help protect the data. The block layer
67 data integrity option provides hooks which can be used by
68 filesystems to ensure better data integrity.
69
70 Say yes here if you have a storage device that provides the
71 T10/SCSI Data Integrity Field or the T13/ATA External Path
72 Protection. If in doubt, say N.
73
Herbert Xua754bd52019-12-23 16:13:51 +080074config BLK_DEV_INTEGRITY_T10
75 tristate
76 depends on BLK_DEV_INTEGRITY
77 select CRC_T10DIF
Keith Buscha7d43832022-03-03 12:13:11 -080078 select CRC64_ROCKSOFT
Herbert Xua754bd52019-12-23 16:13:51 +080079
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090080config BLK_DEV_ZONED
81 bool "Zoned block device support"
Damien Le Moalb9aef632019-06-04 16:23:40 +090082 select MQ_IOSCHED_DEADLINE
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +090083 help
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090084 Block layer zoned block device support. This option enables
Keith Busch240e6ee2020-06-29 12:06:41 -070085 support for ZAC/ZBC/ZNS host-managed and host-aware zoned block
86 devices.
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090087
Keith Busch240e6ee2020-06-29 12:06:41 -070088 Say yes here if you have a ZAC, ZBC, or ZNS storage device.
Hannes Reinecke6a0cb1b2016-10-18 15:40:33 +090089
Vivek Goyale43473b2010-09-15 17:06:35 -040090config BLK_DEV_THROTTLING
91 bool "Block layer bio throttling support"
Masahiro Yamadadf252bd2021-09-27 22:59:57 +090092 depends on BLK_CGROUP
Tejun Heo1d1566462019-11-07 11:18:04 -080093 select BLK_CGROUP_RWSTAT
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +090094 help
Vivek Goyale43473b2010-09-15 17:06:35 -040095 Block layer bio throttling support. It can be used to limit
96 the IO rate to a device. IO rate policies are per cgroup and
97 one needs to mount and use blkio cgroup controller for creating
98 cgroups and specifying per device IO rate policies.
99
Mauro Carvalho Chehabda82c922019-06-27 13:08:35 -0300100 See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
Vivek Goyale43473b2010-09-15 17:06:35 -0400101
Shaohua Li327ffb92017-03-27 10:51:31 -0700102config BLK_DEV_THROTTLING_LOW
103 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
104 depends on BLK_DEV_THROTTLING
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900105 help
Shaohua Li327ffb92017-03-27 10:51:31 -0700106 Add .low limit interface for block throttling. The low limit is a best
107 effort limit to prioritize cgroups. Depending on the setting, the limit
108 can be used to protect cgroups in terms of bandwidth/iops and better
109 utilize disk resource.
110
111 Note, this is an experimental interface and could be changed someday.
112
Jens Axboe87760e52016-11-09 12:38:14 -0700113config BLK_WBT
114 bool "Enable support for block device writeback throttling"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900115 help
Jens Axboe87760e52016-11-09 12:38:14 -0700116 Enabling this option enables the block layer to throttle buffered
117 background writeback from the VM, making it more smooth and having
118 less impact on foreground operations. The throttling is done
119 dynamically on an algorithm loosely based on CoDel, factoring in
120 the realtime performance of the disk.
121
Bart Van Assche5f6776b2021-06-17 17:44:41 -0700122config BLK_WBT_MQ
123 bool "Enable writeback throttling by default"
124 default y
125 depends on BLK_WBT
126 help
127 Enable writeback throttling by default for request-based block devices.
128
Josef Bacikd7067512018-07-03 11:15:01 -0400129config BLK_CGROUP_IOLATENCY
130 bool "Enable support for latency based cgroup IO protection"
Masahiro Yamadadf252bd2021-09-27 22:59:57 +0900131 depends on BLK_CGROUP
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900132 help
Josef Bacikd7067512018-07-03 11:15:01 -0400133 Enabling this option enables the .latency interface for IO throttling.
134 The IO controller will attempt to maintain average IO latencies below
135 the configured latency target, throttling anybody with a higher latency
136 target than the victimized group.
137
138 Note, this is an experimental interface and could be changed someday.
139
Muneendra Kumard2bcbea2021-06-08 10:05:45 +0530140config BLK_CGROUP_FC_APPID
141 bool "Enable support to track FC I/O Traffic across cgroup applications"
Martin K. Petersend2500a02021-07-03 11:58:33 -0400142 depends on BLK_CGROUP && NVME_FC
Muneendra Kumard2bcbea2021-06-08 10:05:45 +0530143 help
144 Enabling this option enables the support to track FC I/O traffic across
145 cgroup applications. It enables the Fabric and the storage targets to
146 identify, monitor, and handle FC traffic based on VM tags by inserting
147 application specific identification into the FC frame.
148
Tejun Heo7caa4712019-08-28 15:05:58 -0700149config BLK_CGROUP_IOCOST
150 bool "Enable support for cost model based cgroup IO controller"
Masahiro Yamadadf252bd2021-09-27 22:59:57 +0900151 depends on BLK_CGROUP
Tejun Heo7caa4712019-08-28 15:05:58 -0700152 select BLK_RQ_ALLOC_TIME
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900153 help
Tejun Heo7caa4712019-08-28 15:05:58 -0700154 Enabling this option enables the .weight interface for cost
155 model based proportional IO control. The IO controller
156 distributes IO capacity between different groups based on
157 their share of the overall weight distribution.
158
Bart Van Assche556910e2021-06-17 17:44:44 -0700159config BLK_CGROUP_IOPRIO
160 bool "Cgroup I/O controller for assigning an I/O priority class"
161 depends on BLK_CGROUP
162 help
163 Enable the .prio interface for assigning an I/O priority class to
164 requests. The I/O priority class affects the order in which an I/O
165 scheduler and block devices process requests. Only some I/O schedulers
166 and some block devices support I/O priorities.
167
Omar Sandoval400f73b2017-01-27 15:03:01 -0700168config BLK_DEBUG_FS
169 bool "Block layer debugging information in debugfs"
170 default y
171 depends on DEBUG_FS
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900172 help
Omar Sandoval400f73b2017-01-27 15:03:01 -0700173 Include block layer debugging information in debugfs. This information
174 is mostly useful for kernel developers, but it doesn't incur any cost
175 at runtime.
176
177 Unless you are building a kernel for a tiny system, you should
178 say Y here.
179
Bart Van Assche6a5ac982018-06-15 14:55:21 -0700180config BLK_DEBUG_FS_ZONED
181 bool
182 default BLK_DEBUG_FS && BLK_DEV_ZONED
183
Scott Bauer455a7b22017-02-03 12:50:31 -0700184config BLK_SED_OPAL
185 bool "Logic for interfacing with Opal enabled SEDs"
Masahiro Yamadaa7f7f622020-06-14 01:50:22 +0900186 help
Scott Bauer455a7b22017-02-03 12:50:31 -0700187 Builds Logic for interfacing with Opal enabled controllers.
188 Enabling this option enables users to setup/unlock/lock
189 Locking ranges for SED devices using the Opal protocol.
190
Satya Tangirala1b262832020-05-14 00:37:17 +0000191config BLK_INLINE_ENCRYPTION
192 bool "Enable inline encryption support in block layer"
193 help
194 Build the blk-crypto subsystem. Enabling this lets the
195 block layer handle encryption, so users can take
196 advantage of inline encryption hardware if present.
197
Satya Tangirala488f6682020-05-14 00:37:20 +0000198config BLK_INLINE_ENCRYPTION_FALLBACK
199 bool "Enable crypto API fallback for blk-crypto"
200 depends on BLK_INLINE_ENCRYPTION
201 select CRYPTO
202 select CRYPTO_SKCIPHER
203 help
204 Enabling this lets the block layer handle inline encryption
205 by falling back to the kernel crypto API when inline
206 encryption hardware is not present.
207
Al Viro9be96f32011-09-16 00:25:05 -0400208source "block/partitions/Kconfig"
209
Stephen Rothwell8ec2ef22016-09-19 15:50:16 +1000210config BLK_MQ_PCI
Masahiro Yamadac50fca52021-09-27 22:59:58 +0900211 def_bool PCI
Stephen Rothwell8ec2ef22016-09-19 15:50:16 +1000212
Christoph Hellwig73473422017-02-05 18:15:24 +0100213config BLK_MQ_VIRTIO
214 bool
Masahiro Yamadac50fca52021-09-27 22:59:58 +0900215 depends on VIRTIO
Christoph Hellwig73473422017-02-05 18:15:24 +0100216 default y
217
Bart Van Asschebca6b062018-09-26 14:01:03 -0700218config BLK_PM
Masahiro Yamadac50fca52021-09-27 22:59:58 +0900219 def_bool PM
Bart Van Asschebca6b062018-09-26 14:01:03 -0700220
Christoph Hellwigc66fd012021-08-04 11:41:40 +0200221# do not use in new code
222config BLOCK_HOLDER_DEPRECATED
223 bool
224
Christoph Hellwig248c7932022-02-15 11:05:36 +0100225config BLK_MQ_STACKING
226 bool
227
Masahiro Yamada8636a1f2018-12-11 20:01:04 +0900228source "block/Kconfig.iosched"
Masahiro Yamadac50fca52021-09-27 22:59:58 +0900229
230endif # BLOCK