1config PSTORE 2 tristate "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 15choice 16 prompt "Choose compression algorithm" 17 depends on PSTORE 18 default PSTORE_ZLIB_COMPRESS 19 help 20 This option chooses compression algorithm. 21 22config PSTORE_ZLIB_COMPRESS 23 bool "ZLIB" 24 select ZLIB_DEFLATE 25 select ZLIB_INFLATE 26 help 27 This option enables ZLIB compression algorithm support. 28 29config PSTORE_LZO_COMPRESS 30 bool "LZO" 31 select LZO_COMPRESS 32 select LZO_DECOMPRESS 33 help 34 This option enables LZO compression algorithm support. 35 36config PSTORE_LZ4_COMPRESS 37 bool "LZ4" 38 select LZ4_COMPRESS 39 select LZ4_DECOMPRESS 40 help 41 This option enables LZ4 compression algorithm support. 42endchoice 43 44config PSTORE_CONSOLE 45 bool "Log kernel console messages" 46 depends on PSTORE 47 help 48 When the option is enabled, pstore will log all kernel 49 messages, even if no oops or panic happened. 50 51config PSTORE_PMSG 52 bool "Log user space messages" 53 depends on PSTORE 54 help 55 When the option is enabled, pstore will export a character 56 interface /dev/pmsg0 to log user space messages. On reboot 57 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID]. 58 59 If unsure, say N. 60 61config PSTORE_FTRACE 62 bool "Persistent function tracer" 63 depends on PSTORE 64 depends on FUNCTION_TRACER 65 depends on DEBUG_FS 66 help 67 With this option kernel traces function calls into a persistent 68 ram buffer that can be decoded and dumped after reboot through 69 pstore filesystem. It can be used to determine what function 70 was last called before a reset or panic. 71 72 If unsure, say N. 73 74config PSTORE_RAM 75 tristate "Log panic/oops to a RAM buffer" 76 depends on PSTORE 77 depends on HAS_IOMEM 78 depends on HAVE_MEMBLOCK 79 select REED_SOLOMON 80 select REED_SOLOMON_ENC8 81 select REED_SOLOMON_DEC8 82 help 83 This enables panic and oops messages to be logged to a circular 84 buffer in RAM where it can be read back at some later point. 85 86 Note that for historical reasons, the module will be named 87 "ramoops.ko". 88 89 For more information, see Documentation/admin-guide/ramoops.rst. 90