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1# SPDX-License-Identifier: GPL-2.0-only
2config PSTORE
3 tristate "Persistent store support"
4 select CRYPTO if PSTORE_COMPRESS
5 default n
6 help
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,
15 say N.
16
17config PSTORE_DEFAULT_KMSG_BYTES
18 int "Default kernel log storage space" if EXPERT
19 depends on PSTORE
20 default "10240"
21 help
22 Defines default size of pstore kernel log storage.
23 Can be enlarged if needed, not recommended to shrink it.
24
25config PSTORE_DEFLATE_COMPRESS
26 tristate "DEFLATE (ZLIB) compression"
27 default y
28 depends on PSTORE
29 select CRYPTO_DEFLATE
30 help
31 This option enables DEFLATE (also known as ZLIB) compression
32 algorithm support.
33
34config PSTORE_LZO_COMPRESS
35 tristate "LZO compression"
36 depends on PSTORE
37 select CRYPTO_LZO
38 help
39 This option enables LZO compression algorithm support.
40
41config PSTORE_LZ4_COMPRESS
42 tristate "LZ4 compression"
43 depends on PSTORE
44 select CRYPTO_LZ4
45 help
46 This option enables LZ4 compression algorithm support.
47
48config PSTORE_LZ4HC_COMPRESS
49 tristate "LZ4HC compression"
50 depends on PSTORE
51 select CRYPTO_LZ4HC
52 help
53 This option enables LZ4HC (high compression) mode algorithm.
54
55config PSTORE_842_COMPRESS
56 bool "842 compression"
57 depends on PSTORE
58 select CRYPTO_842
59 help
60 This option enables 842 compression algorithm support.
61
62config PSTORE_ZSTD_COMPRESS
63 bool "zstd compression"
64 depends on PSTORE
65 select CRYPTO_ZSTD
66 help
67 This option enables zstd compression algorithm support.
68
69config PSTORE_COMPRESS
70 def_bool y
71 depends on PSTORE
72 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
73 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
74 PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS
75
76choice
77 prompt "Default pstore compression algorithm"
78 depends on PSTORE_COMPRESS
79 help
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.
83
84 Currently, pstore has support for 6 compression algorithms:
85 deflate, lzo, lz4, lz4hc, 842 and zstd.
86
87 The default compression algorithm is deflate.
88
89 config PSTORE_DEFLATE_COMPRESS_DEFAULT
90 bool "deflate" if PSTORE_DEFLATE_COMPRESS
91
92 config PSTORE_LZO_COMPRESS_DEFAULT
93 bool "lzo" if PSTORE_LZO_COMPRESS
94
95 config PSTORE_LZ4_COMPRESS_DEFAULT
96 bool "lz4" if PSTORE_LZ4_COMPRESS
97
98 config PSTORE_LZ4HC_COMPRESS_DEFAULT
99 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
100
101 config PSTORE_842_COMPRESS_DEFAULT
102 bool "842" if PSTORE_842_COMPRESS
103
104 config PSTORE_ZSTD_COMPRESS_DEFAULT
105 bool "zstd" if PSTORE_ZSTD_COMPRESS
106
107endchoice
108
109config PSTORE_COMPRESS_DEFAULT
110 string
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
118
119config PSTORE_CONSOLE
120 bool "Log kernel console messages"
121 depends on PSTORE
122 help
123 When the option is enabled, pstore will log all kernel
124 messages, even if no oops or panic happened.
125
126config PSTORE_PMSG
127 bool "Log user space messages"
128 depends on PSTORE
129 select RT_MUTEXES
130 help
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].
134
135 If unsure, say N.
136
137config PSTORE_FTRACE
138 bool "Persistent function tracer"
139 depends on PSTORE
140 depends on FUNCTION_TRACER
141 depends on DEBUG_FS
142 help
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.
147
148 If unsure, say N.
149
150config PSTORE_RAM
151 tristate "Log panic/oops to a RAM buffer"
152 depends on PSTORE
153 depends on HAS_IOMEM
154 select REED_SOLOMON
155 select REED_SOLOMON_ENC8
156 select REED_SOLOMON_DEC8
157 help
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.
160
161 Note that for historical reasons, the module will be named
162 "ramoops.ko".
163
164 For more information, see Documentation/admin-guide/ramoops.rst.
165
166config PSTORE_ZONE
167 tristate
168 depends on PSTORE
169 help
170 The common layer for pstore/blk (and pstore/ram in the future)
171 to manage storage in zones.
172
173config PSTORE_BLK
174 tristate "Log panic/oops to a block device"
175 depends on PSTORE
176 depends on BLOCK
177 select PSTORE_ZONE
178 default n
179 help
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.
182
183 For more information, see Documentation/admin-guide/pstore-blk.rst
184
185 If unsure, say N.
186
187config PSTORE_BLK_BLKDEV
188 string "block device identifier"
189 depends on PSTORE_BLK
190 default ""
191 help
192 Which block device should be used for pstore/blk.
193
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
211 a colon.
212
213 NOTE that, both Kconfig and module parameters can configure
214 pstore/blk, but module parameters have priority over Kconfig.
215
216config PSTORE_BLK_KMSG_SIZE
217 int "Size in Kbytes of kmsg dump log to store"
218 depends on PSTORE_BLK
219 default 64
220 help
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.
223
224 NOTE that, both Kconfig and module parameters can configure
225 pstore/blk, but module parameters have priority over Kconfig.
226
227config PSTORE_BLK_MAX_REASON
228 int "Maximum kmsg dump reason to store"
229 depends on PSTORE_BLK
230 default 2
231 help
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.
235
236 NOTE that, both Kconfig and module parameters can configure
237 pstore/blk, but module parameters have priority over Kconfig.
238
239config PSTORE_BLK_PMSG_SIZE
240 int "Size in Kbytes of pmsg to store"
241 depends on PSTORE_BLK
242 depends on PSTORE_PMSG
243 default 64
244 help
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.
247
248 NOTE that, both Kconfig and module parameters can configure
249 pstore/blk, but module parameters have priority over Kconfig.
250
251config PSTORE_BLK_CONSOLE_SIZE
252 int "Size in Kbytes of console log to store"
253 depends on PSTORE_BLK
254 depends on PSTORE_CONSOLE
255 default 64
256 help
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.
259
260 NOTE that, both Kconfig and module parameters can configure
261 pstore/blk, but module parameters have priority over Kconfig.
262
263config PSTORE_BLK_FTRACE_SIZE
264 int "Size in Kbytes of ftrace log to store"
265 depends on PSTORE_BLK
266 depends on PSTORE_FTRACE
267 default 64
268 help
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.
271
272 NOTE that, both Kconfig and module parameters can configure
273 pstore/blk, but module parameters have priority over Kconfig.
1config PSTORE
2 bool "Persistent store support"
3 default n
4 help
5 This option enables generic access to platform level
6 persistent storage via "pstore" filesystem that can
7 be mounted as /dev/pstore. Only useful if you have
8 a platform level driver that registers with pstore to
9 provide the data, so you probably should just go say "Y"
10 (or "M") to a platform specific persistent store driver
11 (e.g. ACPI_APEI on X86) which will select this for you.
12 If you don't have a platform persistent store driver,
13 say N.
14
15config PSTORE_RAM
16 tristate "Log panic/oops to a RAM buffer"
17 depends on PSTORE
18 depends on HAS_IOMEM
19 depends on HAVE_MEMBLOCK
20 select REED_SOLOMON
21 select REED_SOLOMON_ENC8
22 select REED_SOLOMON_DEC8
23 help
24 This enables panic and oops messages to be logged to a circular
25 buffer in RAM where it can be read back at some later point.
26
27 Note that for historical reasons, the module will be named
28 "ramoops.ko".
29
30 For more information, see Documentation/ramoops.txt.