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Add details on using pstore/blk, the new backend of pstore to record dumps to block devices, in Documentation/admin-guide/pstore-blk.rst Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-7-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
265 lines
8.1 KiB
Plaintext
265 lines
8.1 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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config PSTORE
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tristate "Persistent store support"
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select CRYPTO if PSTORE_COMPRESS
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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_DEFLATE_COMPRESS
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tristate "DEFLATE (ZLIB) compression"
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default y
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depends on PSTORE
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select CRYPTO_DEFLATE
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help
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This option enables DEFLATE (also known as ZLIB) compression
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algorithm support.
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config PSTORE_LZO_COMPRESS
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tristate "LZO compression"
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depends on PSTORE
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select CRYPTO_LZO
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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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tristate "LZ4 compression"
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depends on PSTORE
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select CRYPTO_LZ4
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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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tristate "LZ4HC compression"
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depends on PSTORE
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select CRYPTO_LZ4HC
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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 CRYPTO_842
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help
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This option enables 842 compression algorithm support.
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config PSTORE_ZSTD_COMPRESS
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bool "zstd compression"
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depends on PSTORE
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select CRYPTO_ZSTD
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help
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This option enables zstd 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_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
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PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
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PSTORE_842_COMPRESS || PSTORE_ZSTD_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 6 compression algorithms:
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deflate, lzo, lz4, lz4hc, 842 and zstd.
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The default compression algorithm is deflate.
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config PSTORE_DEFLATE_COMPRESS_DEFAULT
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bool "deflate" if PSTORE_DEFLATE_COMPRESS
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config PSTORE_LZO_COMPRESS_DEFAULT
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bool "lzo" if PSTORE_LZO_COMPRESS
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config PSTORE_LZ4_COMPRESS_DEFAULT
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bool "lz4" if PSTORE_LZ4_COMPRESS
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config PSTORE_LZ4HC_COMPRESS_DEFAULT
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bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
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config PSTORE_842_COMPRESS_DEFAULT
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bool "842" if PSTORE_842_COMPRESS
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config PSTORE_ZSTD_COMPRESS_DEFAULT
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bool "zstd" if PSTORE_ZSTD_COMPRESS
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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 "deflate" if PSTORE_DEFLATE_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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default "zstd" if PSTORE_ZSTD_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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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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config PSTORE_ZONE
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tristate
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depends on PSTORE
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help
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The common layer for pstore/blk (and pstore/ram in the future)
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to manage storage in zones.
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config PSTORE_BLK
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tristate "Log panic/oops to a block device"
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depends on PSTORE
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depends on BLOCK
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select PSTORE_ZONE
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default n
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help
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This enables panic and oops message to be logged to a block dev
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where it can be read back at some later point.
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For more information, see Documentation/admin-guide/pstore-blk.rst
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If unsure, say N.
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config PSTORE_BLK_BLKDEV
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string "block device identifier"
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depends on PSTORE_BLK
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default ""
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help
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Which block device should be used for pstore/blk.
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It accepts the following variants:
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1) <hex_major><hex_minor> device number in hexadecimal representation,
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with no leading 0x, for example b302.
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2) /dev/<disk_name> represents the device name of disk
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3) /dev/<disk_name><decimal> represents the device name and number
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of partition - device number of disk plus the partition number
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4) /dev/<disk_name>p<decimal> - same as the above, this form is
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used when disk name of partitioned disk ends with a digit.
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5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
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unique id of a partition if the partition table provides it.
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The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
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partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
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filled hex representation of the 32-bit "NT disk signature", and PP
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is a zero-filled hex representation of the 1-based partition number.
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6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation
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to a partition with a known unique id.
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7) <major>:<minor> major and minor number of the device separated by
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a colon.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_KMSG_SIZE
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int "Size in Kbytes of kmsg dump log to store"
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depends on PSTORE_BLK
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default 64
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help
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This just sets size of kmsg dump (oops, panic, etc) log for
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pstore/blk. The size is in KB and must be a multiple of 4.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_MAX_REASON
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int "Maximum kmsg dump reason to store"
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depends on PSTORE_BLK
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default 2
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help
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The maximum reason for kmsg dumps to store. The default is
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2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's
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enum kmsg_dump_reason for more details.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_PMSG_SIZE
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int "Size in Kbytes of pmsg to store"
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depends on PSTORE_BLK
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depends on PSTORE_PMSG
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default 64
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help
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This just sets size of pmsg (pmsg_size) for pstore/blk. The size is
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in KB and must be a multiple of 4.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_CONSOLE_SIZE
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int "Size in Kbytes of console log to store"
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depends on PSTORE_BLK
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depends on PSTORE_CONSOLE
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default 64
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help
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This just sets size of console log (console_size) to store via
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pstore/blk. The size is in KB and must be a multiple of 4.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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config PSTORE_BLK_FTRACE_SIZE
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int "Size in Kbytes of ftrace log to store"
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depends on PSTORE_BLK
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depends on PSTORE_FTRACE
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default 64
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help
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This just sets size of ftrace log (ftrace_size) for pstore/blk. The
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size is in KB and must be a multiple of 4.
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NOTE that, both Kconfig and module parameters can configure
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pstore/blk, but module parameters have priority over Kconfig.
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