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