fs/pstore/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 config 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
  17 config PSTORE_DEFLATE_COMPRESS
  18         tristate "DEFLATE (ZLIB) compression"
  19         default y
  20         depends on PSTORE
  21         select CRYPTO_DEFLATE
  22         help
  23           This option enables DEFLATE (also known as ZLIB) compression
  24           algorithm support.
  25
  26 config PSTORE_LZO_COMPRESS
  27         tristate "LZO compression"
  28         depends on PSTORE
  29         select CRYPTO_LZO
  30         help
  31           This option enables LZO compression algorithm support.
  32
  33 config PSTORE_LZ4_COMPRESS
  34         tristate "LZ4 compression"
  35         depends on PSTORE
  36         select CRYPTO_LZ4
  37         help
  38           This option enables LZ4 compression algorithm support.
  39
  40 config PSTORE_LZ4HC_COMPRESS
  41         tristate "LZ4HC compression"
  42         depends on PSTORE
  43         select CRYPTO_LZ4HC
  44         help
  45           This option enables LZ4HC (high compression) mode algorithm.
  46
  47 config PSTORE_842_COMPRESS
  48         bool "842 compression"
  49         depends on PSTORE
  50         select CRYPTO_842
  51         help
  52           This option enables 842 compression algorithm support.
  53
  54 config PSTORE_ZSTD_COMPRESS
  55         bool "zstd compression"
  56         depends on PSTORE
  57         select CRYPTO_ZSTD
  58         help
  59           This option enables zstd compression algorithm support.
  60
  61 config PSTORE_COMPRESS
  62         def_bool y
  63         depends on PSTORE
  64         depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS ||    \
  65                    PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS ||      \
  66                    PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS
  67
  68 choice
  69         prompt "Default pstore compression algorithm"
  70         depends on PSTORE_COMPRESS
  71         help
  72           This option chooses the default active compression algorithm.
  73           This change be changed at boot with "pstore.compress=..." on
  74           the kernel command line.
  75
  76           Currently, pstore has support for 6 compression algorithms:
  77           deflate, lzo, lz4, lz4hc, 842 and zstd.
  78
  79           The default compression algorithm is deflate.
  80
  81         config PSTORE_DEFLATE_COMPRESS_DEFAULT
  82                 bool "deflate" if PSTORE_DEFLATE_COMPRESS
  83
  84         config PSTORE_LZO_COMPRESS_DEFAULT
  85                 bool "lzo" if PSTORE_LZO_COMPRESS
  86
  87         config PSTORE_LZ4_COMPRESS_DEFAULT
  88                 bool "lz4" if PSTORE_LZ4_COMPRESS
  89
  90         config PSTORE_LZ4HC_COMPRESS_DEFAULT
  91                 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
  92
  93         config PSTORE_842_COMPRESS_DEFAULT
  94                 bool "842" if PSTORE_842_COMPRESS
  95
  96         config PSTORE_ZSTD_COMPRESS_DEFAULT
  97                 bool "zstd" if PSTORE_ZSTD_COMPRESS
  98
  99 endchoice
 100
 101 config PSTORE_COMPRESS_DEFAULT
 102         string
 103         depends on PSTORE_COMPRESS
 104         default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
 105         default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
 106         default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
 107         default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
 108         default "842" if PSTORE_842_COMPRESS_DEFAULT
 109         default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT
 110
 111 config PSTORE_CONSOLE
 112         bool "Log kernel console messages"
 113         depends on PSTORE
 114         help
 115           When the option is enabled, pstore will log all kernel
 116           messages, even if no oops or panic happened.
 117
 118 config PSTORE_PMSG
 119         bool "Log user space messages"
 120         depends on PSTORE
 121         help
 122           When the option is enabled, pstore will export a character
 123           interface /dev/pmsg0 to log user space messages. On reboot
 124           data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
 125
 126           If unsure, say N.
 127
 128 config PSTORE_FTRACE
 129         bool "Persistent function tracer"
 130         depends on PSTORE
 131         depends on FUNCTION_TRACER
 132         depends on DEBUG_FS
 133         help
 134           With this option kernel traces function calls into a persistent
 135           ram buffer that can be decoded and dumped after reboot through
 136           pstore filesystem. It can be used to determine what function
 137           was last called before a reset or panic.
 138
 139           If unsure, say N.
 140
 141 config PSTORE_RAM
 142         tristate "Log panic/oops to a RAM buffer"
 143         depends on PSTORE
 144         depends on HAS_IOMEM
 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.