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1 # SPDX-License-Identifier: GPL-2.0
2 #
3 # Block layer core configuration
4 #
5 menuconfig 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
27 if BLOCK
28
29 config BLK_SCSI_REQUEST
30 bool
31
32 config BLK_DEV_BSG
33 bool "Block layer SG support v4"
34 default y
35 select BLK_SCSI_REQUEST
36 help
37 Saying Y here will enable generic SG (SCSI generic) v4 support
38 for any block device.
39
40 Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
41 can handle complicated SCSI commands: tagged variable length cdbs
42 with bidirectional data transfers and generic request/response
43 protocols (e.g. Task Management Functions and SMP in Serial
44 Attached SCSI).
45
46 This option is required by recent UDEV versions to properly
47 access device serial numbers, etc.
48
49 If unsure, say Y.
50
51 config BLK_DEV_BSGLIB
52 bool "Block layer SG support v4 helper lib"
53 select BLK_DEV_BSG
54 select BLK_SCSI_REQUEST
55 help
56 Subsystems will normally enable this if needed. Users will not
57 normally need to manually enable this.
58
59 If unsure, say N.
60
61 config BLK_DEV_INTEGRITY
62 bool "Block layer data integrity support"
63 select CRC_T10DIF if BLK_DEV_INTEGRITY
64 ---help---
65 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
74 config BLK_DEV_ZONED
75 bool "Zoned block device support"
76 ---help---
77 Block layer zoned block device support. This option enables
78 support for ZAC/ZBC host-managed and host-aware zoned block devices.
79
80 Say yes here if you have a ZAC or ZBC storage device.
81
82 config BLK_DEV_THROTTLING
83 bool "Block layer bio throttling support"
84 depends on BLK_CGROUP=y
85 ---help---
86 Block layer bio throttling support. It can be used to limit
87 the IO rate to a device. IO rate policies are per cgroup and
88 one needs to mount and use blkio cgroup controller for creating
89 cgroups and specifying per device IO rate policies.
90
91 See Documentation/cgroup-v1/blkio-controller.txt for more information.
92
93 config BLK_DEV_THROTTLING_LOW
94 bool "Block throttling .low limit interface support (EXPERIMENTAL)"
95 depends on BLK_DEV_THROTTLING
96 ---help---
97 Add .low limit interface for block throttling. The low limit is a best
98 effort limit to prioritize cgroups. Depending on the setting, the limit
99 can be used to protect cgroups in terms of bandwidth/iops and better
100 utilize disk resource.
101
102 Note, this is an experimental interface and could be changed someday.
103
104 config BLK_CMDLINE_PARSER
105 bool "Block device command line partition parser"
106 ---help---
107 Enabling this option allows you to specify the partition layout from
108 the kernel boot args. This is typically of use for embedded devices
109 which don't otherwise have any standardized method for listing the
110 partitions on a block device.
111
112 See Documentation/block/cmdline-partition.txt for more information.
113
114 config BLK_WBT
115 bool "Enable support for block device writeback throttling"
116 ---help---
117 Enabling this option enables the block layer to throttle buffered
118 background writeback from the VM, making it more smooth and having
119 less impact on foreground operations. The throttling is done
120 dynamically on an algorithm loosely based on CoDel, factoring in
121 the realtime performance of the disk.
122
123 config 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
134 config BLK_WBT_MQ
135 bool "Multiqueue writeback throttling"
136 default y
137 depends on BLK_WBT
138 ---help---
139 Enable writeback throttling by default on multiqueue devices.
140 Multiqueue currently doesn't have support for IO scheduling,
141 enabling this option is recommended.
142
143 config BLK_DEBUG_FS
144 bool "Block layer debugging information in debugfs"
145 default y
146 depends on DEBUG_FS
147 ---help---
148 Include block layer debugging information in debugfs. This information
149 is mostly useful for kernel developers, but it doesn't incur any cost
150 at runtime.
151
152 Unless you are building a kernel for a tiny system, you should
153 say Y here.
154
155 config BLK_DEBUG_FS_ZONED
156 bool
157 default BLK_DEBUG_FS && BLK_DEV_ZONED
158
159 config BLK_SED_OPAL
160 bool "Logic for interfacing with Opal enabled SEDs"
161 ---help---
162 Builds Logic for interfacing with Opal enabled controllers.
163 Enabling this option enables users to setup/unlock/lock
164 Locking ranges for SED devices using the Opal protocol.
165
166 menu "Partition Types"
167
168 source "block/partitions/Kconfig"
169
170 endmenu
171
172 endif # BLOCK
173
174 config BLOCK_COMPAT
175 bool
176 depends on BLOCK && COMPAT
177 default y
178
179 config BLK_MQ_PCI
180 bool
181 depends on BLOCK && PCI
182 default y
183
184 config BLK_MQ_VIRTIO
185 bool
186 depends on BLOCK && VIRTIO
187 default y
188
189 config BLK_MQ_RDMA
190 bool
191 depends on BLOCK && INFINIBAND
192 default y
193
194 config BLK_PM
195 def_bool BLOCK && PM
196
197 source "block/Kconfig.iosched"