2 tristate "Persistent store support"
3 select CRYPTO if PSTORE_COMPRESS
6 This option enables generic access to platform level
7 persistent storage via "pstore" filesystem that can
8 be mounted as /dev/pstore. Only useful if you have
9 a platform level driver that registers with pstore to
10 provide the data, so you probably should just go say "Y"
11 (or "M") to a platform specific persistent store driver
12 (e.g. ACPI_APEI on X86) which will select this for you.
13 If you don't have a platform persistent store driver,
16 config PSTORE_DEFLATE_COMPRESS
17 tristate "DEFLATE (ZLIB) compression"
22 This option enables DEFLATE (also known as ZLIB) compression
25 config PSTORE_LZO_COMPRESS
26 tristate "LZO compression"
30 This option enables LZO compression algorithm support.
32 config PSTORE_LZ4_COMPRESS
33 tristate "LZ4 compression"
37 This option enables LZ4 compression algorithm support.
39 config PSTORE_LZ4HC_COMPRESS
40 tristate "LZ4HC compression"
44 This option enables LZ4HC (high compression) mode algorithm.
46 config PSTORE_842_COMPRESS
47 bool "842 compression"
51 This option enables 842 compression algorithm support.
53 config PSTORE_ZSTD_COMPRESS
54 bool "zstd compression"
58 This option enables zstd compression algorithm support.
60 config PSTORE_COMPRESS
63 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
64 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
65 PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS
68 prompt "Default pstore compression algorithm"
69 depends on PSTORE_COMPRESS
71 This option chooses the default active compression algorithm.
72 This change be changed at boot with "pstore.compress=..." on
73 the kernel command line.
75 Currently, pstore has support for 6 compression algorithms:
76 deflate, lzo, lz4, lz4hc, 842 and zstd.
78 The default compression algorithm is deflate.
80 config PSTORE_DEFLATE_COMPRESS_DEFAULT
81 bool "deflate" if PSTORE_DEFLATE_COMPRESS
83 config PSTORE_LZO_COMPRESS_DEFAULT
84 bool "lzo" if PSTORE_LZO_COMPRESS
86 config PSTORE_LZ4_COMPRESS_DEFAULT
87 bool "lz4" if PSTORE_LZ4_COMPRESS
89 config PSTORE_LZ4HC_COMPRESS_DEFAULT
90 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
92 config PSTORE_842_COMPRESS_DEFAULT
93 bool "842" if PSTORE_842_COMPRESS
95 config PSTORE_ZSTD_COMPRESS_DEFAULT
96 bool "zstd" if PSTORE_ZSTD_COMPRESS
100 config PSTORE_COMPRESS_DEFAULT
102 depends on PSTORE_COMPRESS
103 default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
104 default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
105 default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
106 default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
107 default "842" if PSTORE_842_COMPRESS_DEFAULT
108 default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT
110 config PSTORE_CONSOLE
111 bool "Log kernel console messages"
114 When the option is enabled, pstore will log all kernel
115 messages, even if no oops or panic happened.
118 bool "Log user space messages"
121 When the option is enabled, pstore will export a character
122 interface /dev/pmsg0 to log user space messages. On reboot
123 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
128 bool "Persistent function tracer"
130 depends on FUNCTION_TRACER
133 With this option kernel traces function calls into a persistent
134 ram buffer that can be decoded and dumped after reboot through
135 pstore filesystem. It can be used to determine what function
136 was last called before a reset or panic.
141 tristate "Log panic/oops to a RAM buffer"
144 depends on HAVE_MEMBLOCK
146 select REED_SOLOMON_ENC8
147 select REED_SOLOMON_DEC8
149 This enables panic and oops messages to be logged to a circular
150 buffer in RAM where it can be read back at some later point.
152 Note that for historical reasons, the module will be named
155 For more information, see Documentation/admin-guide/ramoops.rst.