xref: /openbmc/linux/block/Kconfig (revision f9834f18)
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_SCSI_REQUEST
33	bool
34
35config BLK_CGROUP_RWSTAT
36	bool
37
38config BLK_DEV_BSG
39	bool "Block layer SG support v4"
40	default y
41	select BLK_SCSI_REQUEST
42	help
43	  Saying Y here will enable generic SG (SCSI generic) v4 support
44	  for any block device.
45
46	  Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
47	  can handle complicated SCSI commands: tagged variable length cdbs
48	  with bidirectional data transfers and generic request/response
49	  protocols (e.g. Task Management Functions and SMP in Serial
50	  Attached SCSI).
51
52	  This option is required by recent UDEV versions to properly
53	  access device serial numbers, etc.
54
55	  If unsure, say Y.
56
57config BLK_DEV_BSGLIB
58	bool "Block layer SG support v4 helper lib"
59	select BLK_DEV_BSG
60	select BLK_SCSI_REQUEST
61	help
62	  Subsystems will normally enable this if needed. Users will not
63	  normally need to manually enable this.
64
65	  If unsure, say N.
66
67config BLK_DEV_INTEGRITY
68	bool "Block layer data integrity support"
69	---help---
70	Some storage devices allow extra information to be
71	stored/retrieved to help protect the data.  The block layer
72	data integrity option provides hooks which can be used by
73	filesystems to ensure better data integrity.
74
75	Say yes here if you have a storage device that provides the
76	T10/SCSI Data Integrity Field or the T13/ATA External Path
77	Protection.  If in doubt, say N.
78
79config BLK_DEV_INTEGRITY_T10
80	tristate
81	depends on BLK_DEV_INTEGRITY
82	select CRC_T10DIF
83
84config BLK_DEV_ZONED
85	bool "Zoned block device support"
86	select MQ_IOSCHED_DEADLINE
87	---help---
88	Block layer zoned block device support. This option enables
89	support for ZAC/ZBC host-managed and host-aware zoned block devices.
90
91	Say yes here if you have a ZAC or ZBC storage device.
92
93config BLK_DEV_THROTTLING
94	bool "Block layer bio throttling support"
95	depends on BLK_CGROUP=y
96	select BLK_CGROUP_RWSTAT
97	---help---
98	Block layer bio throttling support. It can be used to limit
99	the IO rate to a device. IO rate policies are per cgroup and
100	one needs to mount and use blkio cgroup controller for creating
101	cgroups and specifying per device IO rate policies.
102
103	See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information.
104
105config BLK_DEV_THROTTLING_LOW
106	bool "Block throttling .low limit interface support (EXPERIMENTAL)"
107	depends on BLK_DEV_THROTTLING
108	---help---
109	Add .low limit interface for block throttling. The low limit is a best
110	effort limit to prioritize cgroups. Depending on the setting, the limit
111	can be used to protect cgroups in terms of bandwidth/iops and better
112	utilize disk resource.
113
114	Note, this is an experimental interface and could be changed someday.
115
116config BLK_CMDLINE_PARSER
117	bool "Block device command line partition parser"
118	---help---
119	Enabling this option allows you to specify the partition layout from
120	the kernel boot args.  This is typically of use for embedded devices
121	which don't otherwise have any standardized method for listing the
122	partitions on a block device.
123
124	See Documentation/block/cmdline-partition.rst for more information.
125
126config BLK_WBT
127	bool "Enable support for block device writeback throttling"
128	---help---
129	Enabling this option enables the block layer to throttle buffered
130	background writeback from the VM, making it more smooth and having
131	less impact on foreground operations. The throttling is done
132	dynamically on an algorithm loosely based on CoDel, factoring in
133	the realtime performance of the disk.
134
135config BLK_CGROUP_IOLATENCY
136	bool "Enable support for latency based cgroup IO protection"
137	depends on BLK_CGROUP=y
138	---help---
139	Enabling this option enables the .latency interface for IO throttling.
140	The IO controller will attempt to maintain average IO latencies below
141	the configured latency target, throttling anybody with a higher latency
142	target than the victimized group.
143
144	Note, this is an experimental interface and could be changed someday.
145
146config BLK_CGROUP_IOCOST
147	bool "Enable support for cost model based cgroup IO controller"
148	depends on BLK_CGROUP=y
149	select BLK_RQ_ALLOC_TIME
150	---help---
151	Enabling this option enables the .weight interface for cost
152	model based proportional IO control.  The IO controller
153	distributes IO capacity between different groups based on
154	their share of the overall weight distribution.
155
156config BLK_WBT_MQ
157	bool "Multiqueue writeback throttling"
158	default y
159	depends on BLK_WBT
160	---help---
161	Enable writeback throttling by default on multiqueue devices.
162	Multiqueue currently doesn't have support for IO scheduling,
163	enabling this option is recommended.
164
165config BLK_DEBUG_FS
166	bool "Block layer debugging information in debugfs"
167	default y
168	depends on DEBUG_FS
169	---help---
170	Include block layer debugging information in debugfs. This information
171	is mostly useful for kernel developers, but it doesn't incur any cost
172	at runtime.
173
174	Unless you are building a kernel for a tiny system, you should
175	say Y here.
176
177config BLK_DEBUG_FS_ZONED
178       bool
179       default BLK_DEBUG_FS && BLK_DEV_ZONED
180
181config BLK_SED_OPAL
182	bool "Logic for interfacing with Opal enabled SEDs"
183	---help---
184	Builds Logic for interfacing with Opal enabled controllers.
185	Enabling this option enables users to setup/unlock/lock
186	Locking ranges for SED devices using the Opal protocol.
187
188menu "Partition Types"
189
190source "block/partitions/Kconfig"
191
192endmenu
193
194endif # BLOCK
195
196config BLOCK_COMPAT
197	bool
198	depends on BLOCK && COMPAT
199	default y
200
201config BLK_MQ_PCI
202	bool
203	depends on BLOCK && PCI
204	default y
205
206config BLK_MQ_VIRTIO
207	bool
208	depends on BLOCK && VIRTIO
209	default y
210
211config BLK_MQ_RDMA
212	bool
213	depends on BLOCK && INFINIBAND
214	default y
215
216config BLK_PM
217	def_bool BLOCK && PM
218
219source "block/Kconfig.iosched"
220