1 # SPDX-License-Identifier: GPL-2.0-only
3 tristate "Persistent store support"
4 select CRYPTO if PSTORE_COMPRESS
7 This option enables generic access to platform level
8 persistent storage via "pstore" filesystem that can
9 be mounted as /dev/pstore. Only useful if you have
10 a platform level driver that registers with pstore to
11 provide the data, so you probably should just go say "Y"
12 (or "M") to a platform specific persistent store driver
13 (e.g. ACPI_APEI on X86) which will select this for you.
14 If you don't have a platform persistent store driver,
17 config PSTORE_DEFAULT_KMSG_BYTES
18 int "Default kernel log storage space" if EXPERT
22 Defines default size of pstore kernel log storage.
23 Can be enlarged if needed, not recommended to shrink it.
25 config PSTORE_DEFLATE_COMPRESS
26 tristate "DEFLATE (ZLIB) compression"
31 This option enables DEFLATE (also known as ZLIB) compression
34 config PSTORE_LZO_COMPRESS
35 tristate "LZO compression"
39 This option enables LZO compression algorithm support.
41 config PSTORE_LZ4_COMPRESS
42 tristate "LZ4 compression"
46 This option enables LZ4 compression algorithm support.
48 config PSTORE_LZ4HC_COMPRESS
49 tristate "LZ4HC compression"
53 This option enables LZ4HC (high compression) mode algorithm.
55 config PSTORE_842_COMPRESS
56 bool "842 compression"
60 This option enables 842 compression algorithm support.
62 config PSTORE_ZSTD_COMPRESS
63 bool "zstd compression"
67 This option enables zstd compression algorithm support.
69 config PSTORE_COMPRESS
72 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
73 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
74 PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS
77 prompt "Default pstore compression algorithm"
78 depends on PSTORE_COMPRESS
80 This option chooses the default active compression algorithm.
81 This change be changed at boot with "pstore.compress=..." on
82 the kernel command line.
84 Currently, pstore has support for 6 compression algorithms:
85 deflate, lzo, lz4, lz4hc, 842 and zstd.
87 The default compression algorithm is deflate.
89 config PSTORE_DEFLATE_COMPRESS_DEFAULT
90 bool "deflate" if PSTORE_DEFLATE_COMPRESS
92 config PSTORE_LZO_COMPRESS_DEFAULT
93 bool "lzo" if PSTORE_LZO_COMPRESS
95 config PSTORE_LZ4_COMPRESS_DEFAULT
96 bool "lz4" if PSTORE_LZ4_COMPRESS
98 config PSTORE_LZ4HC_COMPRESS_DEFAULT
99 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
101 config PSTORE_842_COMPRESS_DEFAULT
102 bool "842" if PSTORE_842_COMPRESS
104 config PSTORE_ZSTD_COMPRESS_DEFAULT
105 bool "zstd" if PSTORE_ZSTD_COMPRESS
109 config PSTORE_COMPRESS_DEFAULT
111 depends on PSTORE_COMPRESS
112 default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
113 default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
114 default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
115 default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
116 default "842" if PSTORE_842_COMPRESS_DEFAULT
117 default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT
119 config PSTORE_CONSOLE
120 bool "Log kernel console messages"
123 When the option is enabled, pstore will log all kernel
124 messages, even if no oops or panic happened.
127 bool "Log user space messages"
131 When the option is enabled, pstore will export a character
132 interface /dev/pmsg0 to log user space messages. On reboot
133 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
138 bool "Persistent function tracer"
140 depends on FUNCTION_TRACER
143 With this option kernel traces function calls into a persistent
144 ram buffer that can be decoded and dumped after reboot through
145 pstore filesystem. It can be used to determine what function
146 was last called before a reset or panic.
151 tristate "Log panic/oops to a RAM buffer"
155 select REED_SOLOMON_ENC8
156 select REED_SOLOMON_DEC8
158 This enables panic and oops messages to be logged to a circular
159 buffer in RAM where it can be read back at some later point.
161 Note that for historical reasons, the module will be named
164 For more information, see Documentation/admin-guide/ramoops.rst.
170 The common layer for pstore/blk (and pstore/ram in the future)
171 to manage storage in zones.
174 tristate "Log panic/oops to a block device"
180 This enables panic and oops message to be logged to a block dev
181 where it can be read back at some later point.
183 For more information, see Documentation/admin-guide/pstore-blk.rst
187 config PSTORE_BLK_BLKDEV
188 string "block device identifier"
189 depends on PSTORE_BLK
192 Which block device should be used for pstore/blk.
194 It accepts the following variants:
195 1) <hex_major><hex_minor> device number in hexadecimal representation,
196 with no leading 0x, for example b302.
197 2) /dev/<disk_name> represents the device name of disk
198 3) /dev/<disk_name><decimal> represents the device name and number
199 of partition - device number of disk plus the partition number
200 4) /dev/<disk_name>p<decimal> - same as the above, this form is
201 used when disk name of partitioned disk ends with a digit.
202 5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
203 unique id of a partition if the partition table provides it.
204 The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
205 partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
206 filled hex representation of the 32-bit "NT disk signature", and PP
207 is a zero-filled hex representation of the 1-based partition number.
208 6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation
209 to a partition with a known unique id.
210 7) <major>:<minor> major and minor number of the device separated by
213 NOTE that, both Kconfig and module parameters can configure
214 pstore/blk, but module parameters have priority over Kconfig.
216 config PSTORE_BLK_KMSG_SIZE
217 int "Size in Kbytes of kmsg dump log to store"
218 depends on PSTORE_BLK
221 This just sets size of kmsg dump (oops, panic, etc) log for
222 pstore/blk. The size is in KB and must be a multiple of 4.
224 NOTE that, both Kconfig and module parameters can configure
225 pstore/blk, but module parameters have priority over Kconfig.
227 config PSTORE_BLK_MAX_REASON
228 int "Maximum kmsg dump reason to store"
229 depends on PSTORE_BLK
232 The maximum reason for kmsg dumps to store. The default is
233 2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's
234 enum kmsg_dump_reason for more details.
236 NOTE that, both Kconfig and module parameters can configure
237 pstore/blk, but module parameters have priority over Kconfig.
239 config PSTORE_BLK_PMSG_SIZE
240 int "Size in Kbytes of pmsg to store"
241 depends on PSTORE_BLK
242 depends on PSTORE_PMSG
245 This just sets size of pmsg (pmsg_size) for pstore/blk. The size is
246 in KB and must be a multiple of 4.
248 NOTE that, both Kconfig and module parameters can configure
249 pstore/blk, but module parameters have priority over Kconfig.
251 config PSTORE_BLK_CONSOLE_SIZE
252 int "Size in Kbytes of console log to store"
253 depends on PSTORE_BLK
254 depends on PSTORE_CONSOLE
257 This just sets size of console log (console_size) to store via
258 pstore/blk. The size is in KB and must be a multiple of 4.
260 NOTE that, both Kconfig and module parameters can configure
261 pstore/blk, but module parameters have priority over Kconfig.
263 config PSTORE_BLK_FTRACE_SIZE
264 int "Size in Kbytes of ftrace log to store"
265 depends on PSTORE_BLK
266 depends on PSTORE_FTRACE
269 This just sets size of ftrace log (ftrace_size) for pstore/blk. The
270 size is in KB and must be a multiple of 4.
272 NOTE that, both Kconfig and module parameters can configure
273 pstore/blk, but module parameters have priority over Kconfig.