xref: /openbmc/linux/block/Kconfig (revision e1e38ea1) 
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 LBDAF
30	bool "Support for large (2TB+) block devices and files"
31	depends on !64BIT
32	default y
33	help
34	  Enable block devices or files of size 2TB and larger.
35
36	  This option is required to support the full capacity of large
37	  (2TB+) block devices, including RAID, disk, Network Block Device,
38	  Logical Volume Manager (LVM) and loopback.
39
40	  This option also enables support for single files larger than
41	  2TB.
42
43	  The ext4 filesystem requires that this feature be enabled in
44	  order to support filesystems that have the huge_file feature
45	  enabled.  Otherwise, it will refuse to mount in the read-write
46	  mode any filesystems that use the huge_file feature, which is
47	  enabled by default by mke2fs.ext4.
48
49	  The GFS2 filesystem also requires this feature.
50
51	  If unsure, say Y.
52
53config BLK_SCSI_REQUEST
54	bool
55
56config BLK_DEV_BSG
57	bool "Block layer SG support v4"
58	default y
59	select BLK_SCSI_REQUEST
60	help
61	  Saying Y here will enable generic SG (SCSI generic) v4 support
62	  for any block device.
63
64	  Unlike SG v3 (aka block/scsi_ioctl.c drivers/scsi/sg.c), SG v4
65	  can handle complicated SCSI commands: tagged variable length cdbs
66	  with bidirectional data transfers and generic request/response
67	  protocols (e.g. Task Management Functions and SMP in Serial
68	  Attached SCSI).
69
70	  This option is required by recent UDEV versions to properly
71	  access device serial numbers, etc.
72
73	  If unsure, say Y.
74
75config BLK_DEV_BSGLIB
76	bool "Block layer SG support v4 helper lib"
77	default n
78	select BLK_DEV_BSG
79	select BLK_SCSI_REQUEST
80	help
81	  Subsystems will normally enable this if needed. Users will not
82	  normally need to manually enable this.
83
84	  If unsure, say N.
85
86config BLK_DEV_INTEGRITY
87	bool "Block layer data integrity support"
88	select CRC_T10DIF if BLK_DEV_INTEGRITY
89	---help---
90	Some storage devices allow extra information to be
91	stored/retrieved to help protect the data.  The block layer
92	data integrity option provides hooks which can be used by
93	filesystems to ensure better data integrity.
94
95	Say yes here if you have a storage device that provides the
96	T10/SCSI Data Integrity Field or the T13/ATA External Path
97	Protection.  If in doubt, say N.
98
99config BLK_DEV_ZONED
100	bool "Zoned block device support"
101	---help---
102	Block layer zoned block device support. This option enables
103	support for ZAC/ZBC host-managed and host-aware zoned block devices.
104
105	Say yes here if you have a ZAC or ZBC storage device.
106
107config BLK_DEV_THROTTLING
108	bool "Block layer bio throttling support"
109	depends on BLK_CGROUP=y
110	default n
111	---help---
112	Block layer bio throttling support. It can be used to limit
113	the IO rate to a device. IO rate policies are per cgroup and
114	one needs to mount and use blkio cgroup controller for creating
115	cgroups and specifying per device IO rate policies.
116
117	See Documentation/cgroup-v1/blkio-controller.txt for more information.
118
119config BLK_DEV_THROTTLING_LOW
120	bool "Block throttling .low limit interface support (EXPERIMENTAL)"
121	depends on BLK_DEV_THROTTLING
122	default n
123	---help---
124	Add .low limit interface for block throttling. The low limit is a best
125	effort limit to prioritize cgroups. Depending on the setting, the limit
126	can be used to protect cgroups in terms of bandwidth/iops and better
127	utilize disk resource.
128
129	Note, this is an experimental interface and could be changed someday.
130
131config BLK_CMDLINE_PARSER
132	bool "Block device command line partition parser"
133	default n
134	---help---
135	Enabling this option allows you to specify the partition layout from
136	the kernel boot args.  This is typically of use for embedded devices
137	which don't otherwise have any standardized method for listing the
138	partitions on a block device.
139
140	See Documentation/block/cmdline-partition.txt for more information.
141
142config BLK_WBT
143	bool "Enable support for block device writeback throttling"
144	default n
145	---help---
146	Enabling this option enables the block layer to throttle buffered
147	background writeback from the VM, making it more smooth and having
148	less impact on foreground operations. The throttling is done
149	dynamically on an algorithm loosely based on CoDel, factoring in
150	the realtime performance of the disk.
151
152config BLK_CGROUP_IOLATENCY
153	bool "Enable support for latency based cgroup IO protection"
154	depends on BLK_CGROUP=y
155	default n
156	---help---
157	Enabling this option enables the .latency interface for IO throttling.
158	The IO controller will attempt to maintain average IO latencies below
159	the configured latency target, throttling anybody with a higher latency
160	target than the victimized group.
161
162	Note, this is an experimental interface and could be changed someday.
163
164config BLK_WBT_SQ
165	bool "Single queue writeback throttling"
166	default n
167	depends on BLK_WBT
168	---help---
169	Enable writeback throttling by default on legacy single queue devices
170
171config BLK_WBT_MQ
172	bool "Multiqueue writeback throttling"
173	default y
174	depends on BLK_WBT
175	---help---
176	Enable writeback throttling by default on multiqueue devices.
177	Multiqueue currently doesn't have support for IO scheduling,
178	enabling this option is recommended.
179
180config BLK_DEBUG_FS
181	bool "Block layer debugging information in debugfs"
182	default y
183	depends on DEBUG_FS
184	---help---
185	Include block layer debugging information in debugfs. This information
186	is mostly useful for kernel developers, but it doesn't incur any cost
187	at runtime.
188
189	Unless you are building a kernel for a tiny system, you should
190	say Y here.
191
192config BLK_DEBUG_FS_ZONED
193       bool
194       default BLK_DEBUG_FS && BLK_DEV_ZONED
195
196config BLK_SED_OPAL
197	bool "Logic for interfacing with Opal enabled SEDs"
198	---help---
199	Builds Logic for interfacing with Opal enabled controllers.
200	Enabling this option enables users to setup/unlock/lock
201	Locking ranges for SED devices using the Opal protocol.
202
203menu "Partition Types"
204
205source "block/partitions/Kconfig"
206
207endmenu
208
209endif # BLOCK
210
211config BLOCK_COMPAT
212	bool
213	depends on BLOCK && COMPAT
214	default y
215
216config BLK_MQ_PCI
217	bool
218	depends on BLOCK && PCI
219	default y
220
221config BLK_MQ_VIRTIO
222	bool
223	depends on BLOCK && VIRTIO
224	default y
225
226config BLK_MQ_RDMA
227	bool
228	depends on BLOCK && INFINIBAND
229	default y
230
231source block/Kconfig.iosched
232