1config PSTORE 2 tristate "Persistent store support" 3 select CRYPTO if PSTORE_COMPRESS 4 default n 5 help 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, 14 say N. 15 16config PSTORE_DEFLATE_COMPRESS 17 tristate "DEFLATE (ZLIB) compression" 18 default y 19 depends on PSTORE 20 select CRYPTO_DEFLATE 21 help 22 This option enables DEFLATE (also known as ZLIB) compression 23 algorithm support. 24 25config PSTORE_LZO_COMPRESS 26 tristate "LZO compression" 27 depends on PSTORE 28 select CRYPTO_LZO 29 help 30 This option enables LZO compression algorithm support. 31 32config PSTORE_LZ4_COMPRESS 33 tristate "LZ4 compression" 34 depends on PSTORE 35 select CRYPTO_LZ4 36 help 37 This option enables LZ4 compression algorithm support. 38 39config PSTORE_LZ4HC_COMPRESS 40 tristate "LZ4HC compression" 41 depends on PSTORE 42 select CRYPTO_LZ4HC 43 help 44 This option enables LZ4HC (high compression) mode algorithm. 45 46config PSTORE_842_COMPRESS 47 bool "842 compression" 48 depends on PSTORE 49 select CRYPTO_842 50 help 51 This option enables 842 compression algorithm support. 52 53config PSTORE_ZSTD_COMPRESS 54 bool "zstd compression" 55 depends on PSTORE 56 select CRYPTO_ZSTD 57 help 58 This option enables zstd compression algorithm support. 59 60config PSTORE_COMPRESS 61 def_bool y 62 depends on PSTORE 63 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \ 64 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \ 65 PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS 66 67choice 68 prompt "Default pstore compression algorithm" 69 depends on PSTORE_COMPRESS 70 help 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. 74 75 Currently, pstore has support for 6 compression algorithms: 76 deflate, lzo, lz4, lz4hc, 842 and zstd. 77 78 The default compression algorithm is deflate. 79 80 config PSTORE_DEFLATE_COMPRESS_DEFAULT 81 bool "deflate" if PSTORE_DEFLATE_COMPRESS 82 83 config PSTORE_LZO_COMPRESS_DEFAULT 84 bool "lzo" if PSTORE_LZO_COMPRESS 85 86 config PSTORE_LZ4_COMPRESS_DEFAULT 87 bool "lz4" if PSTORE_LZ4_COMPRESS 88 89 config PSTORE_LZ4HC_COMPRESS_DEFAULT 90 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS 91 92 config PSTORE_842_COMPRESS_DEFAULT 93 bool "842" if PSTORE_842_COMPRESS 94 95 config PSTORE_ZSTD_COMPRESS_DEFAULT 96 bool "zstd" if PSTORE_ZSTD_COMPRESS 97 98endchoice 99 100config PSTORE_COMPRESS_DEFAULT 101 string 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 109 110config PSTORE_CONSOLE 111 bool "Log kernel console messages" 112 depends on PSTORE 113 help 114 When the option is enabled, pstore will log all kernel 115 messages, even if no oops or panic happened. 116 117config PSTORE_PMSG 118 bool "Log user space messages" 119 depends on PSTORE 120 help 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]. 124 125 If unsure, say N. 126 127config PSTORE_FTRACE 128 bool "Persistent function tracer" 129 depends on PSTORE 130 depends on FUNCTION_TRACER 131 depends on DEBUG_FS 132 help 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. 137 138 If unsure, say N. 139 140config PSTORE_RAM 141 tristate "Log panic/oops to a RAM buffer" 142 depends on PSTORE 143 depends on HAS_IOMEM 144 depends on HAVE_MEMBLOCK 145 select REED_SOLOMON 146 select REED_SOLOMON_ENC8 147 select REED_SOLOMON_DEC8 148 help 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. 151 152 Note that for historical reasons, the module will be named 153 "ramoops.ko". 154 155 For more information, see Documentation/admin-guide/ramoops.rst. 156