fe1d475888
To allow for easier build test coverage and run-time testing, this allows multiple compression algorithms to be built into pstore. Still only one is supported to operate at a time (which can be selected at build time or at boot time, similar to how LSMs are selected). Signed-off-by: Kees Cook <keescook@chromium.org>
148 lines
4.0 KiB
Plaintext
148 lines
4.0 KiB
Plaintext
config PSTORE
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tristate "Persistent store support"
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default n
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help
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This option enables generic access to platform level
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persistent storage via "pstore" filesystem that can
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be mounted as /dev/pstore. Only useful if you have
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a platform level driver that registers with pstore to
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provide the data, so you probably should just go say "Y"
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(or "M") to a platform specific persistent store driver
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(e.g. ACPI_APEI on X86) which will select this for you.
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If you don't have a platform persistent store driver,
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say N.
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config PSTORE_ZLIB_COMPRESS
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bool "ZLIB compression"
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default y
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depends on PSTORE
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select ZLIB_DEFLATE
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select ZLIB_INFLATE
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help
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This option enables ZLIB compression algorithm support.
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config PSTORE_LZO_COMPRESS
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bool "LZO compression"
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depends on PSTORE
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select LZO_COMPRESS
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select LZO_DECOMPRESS
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help
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This option enables LZO compression algorithm support.
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config PSTORE_LZ4_COMPRESS
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bool "LZ4 compression"
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depends on PSTORE
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select LZ4_COMPRESS
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select LZ4_DECOMPRESS
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help
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This option enables LZ4 compression algorithm support.
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config PSTORE_LZ4HC_COMPRESS
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bool "LZ4HC compression"
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depends on PSTORE
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select LZ4HC_COMPRESS
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select LZ4_DECOMPRESS
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help
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This option enables LZ4HC (high compression) mode algorithm.
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config PSTORE_842_COMPRESS
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bool "842 compression"
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depends on PSTORE
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select 842_COMPRESS
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select 842_DECOMPRESS
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help
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This option enables 842 compression algorithm support.
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config PSTORE_COMPRESS
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def_bool y
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depends on PSTORE
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depends on PSTORE_ZLIB_COMPRESS || PSTORE_LZO_COMPRESS || \
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PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
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PSTORE_842_COMPRESS
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choice
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prompt "Default pstore compression algorithm"
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depends on PSTORE_COMPRESS
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help
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This option chooses the default active compression algorithm.
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This change be changed at boot with "pstore.compress=..." on
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the kernel command line.
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Currently, pstore has support for 5 compression algorithms:
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zlib, lzo, lz4, lz4hc and 842.
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The default compression algorithm is zlib.
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config PSTORE_ZLIB_COMPRESS_DEFAULT
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bool "zlib" if PSTORE_ZLIB_COMPRESS=y
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config PSTORE_LZO_COMPRESS_DEFAULT
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bool "lzo" if PSTORE_LZO_COMPRESS=y
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config PSTORE_LZ4_COMPRESS_DEFAULT
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bool "lz4" if PSTORE_LZ4_COMPRESS=y
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config PSTORE_LZ4HC_COMPRESS_DEFAULT
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bool "lz4hc" if PSTORE_LZ4HC_COMPRESS=y
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config PSTORE_842_COMPRESS_DEFAULT
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bool "842" if PSTORE_842_COMPRESS=y
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endchoice
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config PSTORE_COMPRESS_DEFAULT
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string
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depends on PSTORE_COMPRESS
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default "zlib" if PSTORE_ZLIB_COMPRESS_DEFAULT
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default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
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default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
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default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
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default "842" if PSTORE_842_COMPRESS_DEFAULT
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config PSTORE_CONSOLE
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bool "Log kernel console messages"
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depends on PSTORE
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help
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When the option is enabled, pstore will log all kernel
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messages, even if no oops or panic happened.
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config PSTORE_PMSG
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bool "Log user space messages"
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depends on PSTORE
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help
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When the option is enabled, pstore will export a character
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interface /dev/pmsg0 to log user space messages. On reboot
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data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
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If unsure, say N.
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config PSTORE_FTRACE
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bool "Persistent function tracer"
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depends on PSTORE
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depends on FUNCTION_TRACER
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depends on DEBUG_FS
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help
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With this option kernel traces function calls into a persistent
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ram buffer that can be decoded and dumped after reboot through
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pstore filesystem. It can be used to determine what function
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was last called before a reset or panic.
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If unsure, say N.
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config PSTORE_RAM
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tristate "Log panic/oops to a RAM buffer"
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depends on PSTORE
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depends on HAS_IOMEM
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depends on HAVE_MEMBLOCK
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select REED_SOLOMON
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select REED_SOLOMON_ENC8
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select REED_SOLOMON_DEC8
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help
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This enables panic and oops messages to be logged to a circular
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buffer in RAM where it can be read back at some later point.
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Note that for historical reasons, the module will be named
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"ramoops.ko".
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For more information, see Documentation/admin-guide/ramoops.rst.
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