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# SPDX-License-Identifier: GPL-2.0-only
config PSTORE
tristate "Persistent store support"
select CRYPTO if PSTORE_COMPRESS
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_DEFLATE_COMPRESS
tristate "DEFLATE (ZLIB) compression"
default y
depends on PSTORE
select CRYPTO_DEFLATE
help
This option enables DEFLATE (also known as ZLIB) compression
algorithm support.
config PSTORE_LZO_COMPRESS
tristate "LZO compression"
depends on PSTORE
select CRYPTO_LZO
help
This option enables LZO compression algorithm support.
config PSTORE_LZ4_COMPRESS
tristate "LZ4 compression"
depends on PSTORE
select CRYPTO_LZ4
help
This option enables LZ4 compression algorithm support.
config PSTORE_LZ4HC_COMPRESS
tristate "LZ4HC compression"
depends on PSTORE
select CRYPTO_LZ4HC
help
This option enables LZ4HC (high compression) mode algorithm.
config PSTORE_842_COMPRESS
bool "842 compression"
depends on PSTORE
select CRYPTO_842
help
This option enables 842 compression algorithm support.
config PSTORE_ZSTD_COMPRESS
bool "zstd compression"
depends on PSTORE
select CRYPTO_ZSTD
help
This option enables zstd compression algorithm support.
config PSTORE_COMPRESS
def_bool y
depends on PSTORE
depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
PSTORE_842_COMPRESS || PSTORE_ZSTD_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 6 compression algorithms:
deflate, lzo, lz4, lz4hc, 842 and zstd.
The default compression algorithm is deflate.
config PSTORE_DEFLATE_COMPRESS_DEFAULT
bool "deflate" if PSTORE_DEFLATE_COMPRESS
config PSTORE_LZO_COMPRESS_DEFAULT
bool "lzo" if PSTORE_LZO_COMPRESS
config PSTORE_LZ4_COMPRESS_DEFAULT
bool "lz4" if PSTORE_LZ4_COMPRESS
config PSTORE_LZ4HC_COMPRESS_DEFAULT
bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
config PSTORE_842_COMPRESS_DEFAULT
bool "842" if PSTORE_842_COMPRESS
config PSTORE_ZSTD_COMPRESS_DEFAULT
bool "zstd" if PSTORE_ZSTD_COMPRESS
endchoice
config PSTORE_COMPRESS_DEFAULT
string
depends on PSTORE_COMPRESS
default "deflate" if PSTORE_DEFLATE_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
default "zstd" if PSTORE_ZSTD_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
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.
config PSTORE_ZONE
tristate
depends on PSTORE
help
The common layer for pstore/blk (and pstore/ram in the future)
to manage storage in zones.
config PSTORE_BLK
tristate "Log panic/oops to a block device"
depends on PSTORE
depends on BLOCK
select PSTORE_ZONE
default n
help
This enables panic and oops message to be logged to a block dev
where it can be read back at some later point.
If unsure, say N.
config PSTORE_BLK_BLKDEV
string "block device identifier"
depends on PSTORE_BLK
default ""
help
Which block device should be used for pstore/blk.
It accept the following variants:
1) <hex_major><hex_minor> device number in hexadecimal representation,
with no leading 0x, for example b302.
2) /dev/<disk_name> represents the device number of disk
3) /dev/<disk_name><decimal> represents the device number
of partition - device number of disk plus the partition number
4) /dev/<disk_name>p<decimal> - same as the above, this form is
used when disk name of partitioned disk ends with a digit.
5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
unique id of a partition if the partition table provides it.
The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
filled hex representation of the 32-bit "NT disk signature", and PP
is a zero-filled hex representation of the 1-based partition number.
6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation
to a partition with a known unique id.
7) <major>:<minor> major and minor number of the device separated by
a colon.
NOTE that, both Kconfig and module parameters can configure
pstore/blk, but module parameters have priority over Kconfig.
config PSTORE_BLK_KMSG_SIZE
int "Size in Kbytes of kmsg dump log to store"
depends on PSTORE_BLK
default 64
help
This just sets size of kmsg dump (oops, panic, etc) log for
pstore/blk. The size is in KB and must be a multiple of 4.
NOTE that, both Kconfig and module parameters can configure
pstore/blk, but module parameters have priority over Kconfig.
config PSTORE_BLK_MAX_REASON
int "Maximum kmsg dump reason to store"
depends on PSTORE_BLK
default 2
help
The maximum reason for kmsg dumps to store. The default is
2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's
enum kmsg_dump_reason for more details.
NOTE that, both Kconfig and module parameters can configure
pstore/blk, but module parameters have priority over Kconfig.
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