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linux/fs/pstore/Kconfig

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treewide: Add SPDX license identifier - Makefile/Kconfig Add SPDX license identifiers to all Make/Kconfig files which: - Have no license information of any form These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-19 20:07:45 +08:00
# SPDX-License-Identifier: GPL-2.0-only
pstore: new filesystem interface to platform persistent storage Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com>
2010-12-29 06:25:21 +08:00
config PSTORE
pstore: add pstore unregister pstore doesn't support unregistering yet. It was marked as TODO. This patch adds some code to fix it: 1) Add functions to unregister kmsg/console/ftrace/pmsg. 2) Add a function to free compression buffer. 3) Unmap the memory and free it. 4) Add a function to unregister pstore filesystem. Signed-off-by: Geliang Tang <geliangtang@163.com> Acked-by: Kees Cook <keescook@chromium.org> [Removed __exit annotation from ramoops_remove(). Reported by Arnd Bergmann] Signed-off-by: Tony Luck <tony.luck@intel.com>
2015-10-20 15:39:03 +08:00
tristate "Persistent store support"
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
select CRYPTO if PSTORE_COMPRESS
pstore: new filesystem interface to platform persistent storage Some platforms have a small amount of non-volatile storage that can be used to store information useful to diagnose the cause of a system crash. This is the generic part of a file system interface that presents information from the crash as a series of files in /dev/pstore. Once the information has been seen, the underlying storage is freed by deleting the files. Signed-off-by: Tony Luck <tony.luck@intel.com>
2010-12-29 06:25:21 +08:00
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.
ramoops: Move to fs/pstore/ram.c Since ramoops was converted to pstore, it has nothing to do with character devices nowadays. Instead, today it is just a RAM backend for pstore. The patch just moves things around. There are a few changes were needed because of the move: 1. Kconfig and Makefiles fixups, of course. 2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this is needed to keep user experience the same as with ramoops driver (i.e. so that ramoops.foo kernel command line arguments would still work). Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Marco Stornelli <marco.stornelli@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-16 20:43:08 +08:00
pstore: Move kmsg_bytes default into Kconfig While kmsg_bytes can be set for pstore via mount, if a crash occurs before the mount only partial console log will be stored as kmsg_bytes defaults to a potentially different hardcoded value in the kernel (PSTORE_DEFAULT_KMSG_BYTES). This makes it impossible to analyze valuable post-mortem data especially on the embedded development or in the process of bringing up new boards. Change this value to be a Kconfig option with the default of old PSTORE_DEFAULT_KMSG_BYTES Signed-off-by: Vasile-Laurentiu Stanimir <vasile-laurentiu.stanimir@windriver.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-11-04 21:05:32 +08:00
config PSTORE_DEFAULT_KMSG_BYTES
int "Default kernel log storage space" if EXPERT
depends on PSTORE
default "10240"
help
Defines default size of pstore kernel log storage.
Can be enlarged if needed, not recommended to shrink it.
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
config PSTORE_DEFLATE_COMPRESS
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
tristate "DEFLATE (ZLIB) compression"
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
default y
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
select CRYPTO_DEFLATE
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
help
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
This option enables DEFLATE (also known as ZLIB) compression
algorithm support.
pstore: add lzo/lz4 compression support Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2016-02-18 22:04:22 +08:00
config PSTORE_LZO_COMPRESS
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
tristate "LZO compression"
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
select CRYPTO_LZO
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
help
This option enables LZO compression algorithm support.
pstore: add lzo/lz4 compression support Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2016-02-18 22:04:22 +08:00
config PSTORE_LZ4_COMPRESS
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
tristate "LZ4 compression"
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
select CRYPTO_LZ4
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
help
This option enables LZ4 compression algorithm support.
pstore: Add lz4hc and 842 compression support Currently, pstore has supported three compression algorithms: zlib, lzo and lz4. This patch added two more compression algorithms: lz4hc and 842. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked Kconfig help text slightly] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-02-13 14:40:39 +08:00
config PSTORE_LZ4HC_COMPRESS
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
tristate "LZ4HC compression"
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
select CRYPTO_LZ4HC
pstore: Add lz4hc and 842 compression support Currently, pstore has supported three compression algorithms: zlib, lzo and lz4. This patch added two more compression algorithms: lz4hc and 842. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked Kconfig help text slightly] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-02-13 14:40:39 +08:00
help
This option enables LZ4HC (high compression) mode algorithm.
config PSTORE_842_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
bool "842 compression"
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
select CRYPTO_842
pstore: Add lz4hc and 842 compression support Currently, pstore has supported three compression algorithms: zlib, lzo and lz4. This patch added two more compression algorithms: lz4hc and 842. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked Kconfig help text slightly] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-02-13 14:40:39 +08:00
help
This option enables 842 compression algorithm support.
pstore: add zstd compression support This patch added the 6th compression algorithm support for pstore: zstd. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-08-01 19:23:37 +08:00
config PSTORE_ZSTD_COMPRESS
bool "zstd compression"
depends on PSTORE
select CRYPTO_ZSTD
help
This option enables zstd compression algorithm support.
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_COMPRESS
def_bool y
depends on PSTORE
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
pstore: add zstd compression support This patch added the 6th compression algorithm support for pstore: zstd. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-08-01 19:23:37 +08:00
PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
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.
pstore: add zstd compression support This patch added the 6th compression algorithm support for pstore: zstd. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-08-01 19:23:37 +08:00
Currently, pstore has support for 6 compression algorithms:
deflate, lzo, lz4, lz4hc, 842 and zstd.
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
The default compression algorithm is deflate.
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
config PSTORE_DEFLATE_COMPRESS_DEFAULT
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
bool "deflate" if PSTORE_DEFLATE_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_LZO_COMPRESS_DEFAULT
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
bool "lzo" if PSTORE_LZO_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_LZ4_COMPRESS_DEFAULT
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
bool "lz4" if PSTORE_LZ4_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_LZ4HC_COMPRESS_DEFAULT
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_842_COMPRESS_DEFAULT
pstore: fix crypto dependencies The new crypto API use causes some problems with Kconfig dependencies, including this link error: fs/pstore/platform.o: In function `pstore_register': platform.c:(.text+0x248): undefined reference to `crypto_has_alg' platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base' fs/pstore/platform.o: In function `pstore_unregister': platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm' crypto/lz4hc.o: In function `lz4hc_sdecompress': lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_decompress_crypto': lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe' crypto/lz4hc.o: In function `lz4hc_scompress': lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC' crypto/lz4hc.o: In function `lz4hc_mod_init': lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg' lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp' lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg' The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4' from a bool symbol, or call crypto API functions from a built-in module. This turns the sub-options into 'tristate' ones so the dependencies are honored, and makes the pstore itself select the crypto core if necessary. Fixes: cb3bee0369bc ("pstore: Use crypto compress API") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-15 23:34:08 +08:00
bool "842" if PSTORE_842_COMPRESS
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
pstore: add zstd compression support This patch added the 6th compression algorithm support for pstore: zstd. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-08-01 19:23:37 +08:00
config PSTORE_ZSTD_COMPRESS_DEFAULT
bool "zstd" if PSTORE_ZSTD_COMPRESS
pstore: add lzo/lz4 compression support Like zlib compression in pstore, this patch added lzo and lz4 compression support so that users can have more options and better compression ratio. The original code treats the compressed data together with the uncompressed ECC correction notice by using zlib decompress. The ECC correction notice is missing in the decompression process. The treatment also makes lzo and lz4 not working. So I treat them separately by using pstore_decompress() to treat the compressed data, and memcpy() to treat the uncompressed ECC correction notice. Signed-off-by: Geliang Tang <geliangtang@163.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2016-02-18 22:04:22 +08:00
endchoice
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
config PSTORE_COMPRESS_DEFAULT
string
depends on PSTORE_COMPRESS
pstore: Use crypto compress API In the pstore compression part, we use zlib/lzo/lz4/lz4hc/842 compression algorithm API to implement pstore compression backends. But there are many repeat codes in these implementations. This patch uses crypto compress API to simplify these codes. 1) rewrite allocate_buf_for_compression, free_buf_for_compression, pstore_compress, pstore_decompress functions using crypto compress API. 2) drop compress, decompress, allocate, free functions in pstore_zbackend, and add zbufsize function to get each different compress buffer size. 3) use late_initcall to call ramoops_init later, to make sure the crypto subsystem has already initialized. 4) use 'unsigned int' type instead of 'size_t' in pstore_compress, pstore_decompress functions' length arguments. 5) rename 'zlib' to 'deflate' to follow the crypto API's name convention. Signed-off-by: Geliang Tang <geliangtang@gmail.com> [kees: tweaked error messages on allocation failures and Kconfig help] Signed-off-by: Kees Cook <keescook@chromium.org>
2018-03-09 18:51:07 +08:00
default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
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
pstore: add zstd compression support This patch added the 6th compression algorithm support for pstore: zstd. Signed-off-by: Geliang Tang <geliangtang@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org>
2018-08-01 19:23:37 +08:00
default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT
pstore: Select compression at runtime 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>
2018-03-07 07:57:38 +08:00
pstore: Add console log messages support Pstore doesn't support logging kernel messages in run-time, it only dumps dmesg when kernel oopses/panics. This makes pstore useless for debugging hangs caused by HW issues or improper use of HW (e.g. weird device inserted -> driver tried to write a reserved bits -> SoC hanged. In that case we don't get any messages in the pstore. Therefore, let's add a runtime logging support: PSTORE_TYPE_CONSOLE. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Kees Cook <keescook@chromium.org> Acked-by: Colin Cross <ccross@android.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-26 21:20:19 +08:00
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.
pstore: Add pmsg - user-space accessible pstore object A secured user-space accessible pstore object. Writes to /dev/pmsg0 are appended to the buffer, on reboot the persistent contents are available in /sys/fs/pstore/pmsg-ramoops-[ID]. One possible use is syslogd, or other daemon, can write messages, then on reboot provides a means to triage user-space activities leading up to a panic as a companion to the pstore dmesg or console logs. Signed-off-by: Mark Salyzyn <salyzyn@android.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
2015-01-17 08:01:10 +08:00
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.
pstore: Add persistent function tracing With this support kernel can save function call chain log 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. We store the log in a binary format and then decode it at read time. p.s. Mostly the code comes from trace_persistent.c driver found in the Android git tree, written by Colin Cross <ccross@android.com> (according to sign-off history). I reworked the driver a little bit, and ported it to pstore. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-10 08:10:41 +08:00
config PSTORE_FTRACE
bool "Persistent function tracer"
depends on PSTORE
depends on FUNCTION_TRACER
pstore/ftrace: Convert to its own enable/disable debugfs knob With this patch we no longer reuse function tracer infrastructure, now we register our own tracer back-end via a debugfs knob. It's a bit more code, but that is the only downside. On the bright side we have: - Ability to make persistent_ram module removable (when needed, we can move ftrace_ops struct into a module). Note that persistent_ram is still not removable for other reasons, but with this patch it's just one thing less to worry about; - Pstore part is more isolated from the generic function tracer. We tried it already by registering our own tracer in available_tracers, but that way we're loosing ability to see the traces while we record them to pstore. This solution is somewhere in the middle: we only register "internal ftracer" back-end, but not the "front-end"; - When there is only pstore tracing enabled, the kernel will only write to the pstore buffer, omitting function tracer buffer (which, of course, still can be enabled via 'echo function > current_tracer'). Suggested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org>
2012-07-18 05:26:15 +08:00
depends on DEBUG_FS
pstore: Add persistent function tracing With this support kernel can save function call chain log 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. We store the log in a binary format and then decode it at read time. p.s. Mostly the code comes from trace_persistent.c driver found in the Android git tree, written by Colin Cross <ccross@android.com> (according to sign-off history). I reworked the driver a little bit, and ported it to pstore. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-07-10 08:10:41 +08:00
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.
ramoops: Move to fs/pstore/ram.c Since ramoops was converted to pstore, it has nothing to do with character devices nowadays. Instead, today it is just a RAM backend for pstore. The patch just moves things around. There are a few changes were needed because of the move: 1. Kconfig and Makefiles fixups, of course. 2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this is needed to keep user experience the same as with ramoops driver (i.e. so that ramoops.foo kernel command line arguments would still work). Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Marco Stornelli <marco.stornelli@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-16 20:43:08 +08:00
config PSTORE_RAM
tristate "Log panic/oops to a RAM buffer"
depends on PSTORE
staging: android: persistent_ram: Move to fs/pstore/ram_core.c This is a first step for adding ECC support for pstore RAM backend: we will use the persistent_ram routines, kindly provided by Google. Basically, persistent_ram is a set of helper routines to deal with the [optionally] ECC-protected persistent ram regions. A bit of Makefile, Kconfig and header files adjustments were needed because of the move. Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-17 15:15:08 +08:00
depends on HAS_IOMEM
select REED_SOLOMON
select REED_SOLOMON_ENC8
select REED_SOLOMON_DEC8
ramoops: Move to fs/pstore/ram.c Since ramoops was converted to pstore, it has nothing to do with character devices nowadays. Instead, today it is just a RAM backend for pstore. The patch just moves things around. There are a few changes were needed because of the move: 1. Kconfig and Makefiles fixups, of course. 2. In pstore/ram.c we have to play a bit with MODULE_PARAM_PREFIX, this is needed to keep user experience the same as with ramoops driver (i.e. so that ramoops.foo kernel command line arguments would still work). Signed-off-by: Anton Vorontsov <anton.vorontsov@linaro.org> Acked-by: Marco Stornelli <marco.stornelli@gmail.com> Acked-by: Kees Cook <keescook@chromium.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-05-16 20:43:08 +08:00
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".
docs: fix locations of several documents that got moved The previous patch renamed several files that are cross-referenced along the Kernel documentation. Adjust the links to point to the right places. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
2016-10-18 20:12:27 +08:00
For more information, see Documentation/admin-guide/ramoops.rst.
pstore/zone: Introduce common layer to manage storage zones Implement a common set of APIs needed to support pstore storage zones, based on how ramoops is designed. This will be used by pstore/blk with the intention of migrating pstore/ram in the future. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-2-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:56 +08:00
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.
pstore/blk: Introduce backend for block devices pstore/blk is similar to pstore/ram, but uses a block device as the storage rather than persistent ram. The pstore/blk backend solves two common use-cases that used to preclude using pstore/ram: - not all devices have a battery that could be used to persist regular RAM across power failures. - most embedded intelligent equipment have no persistent ram, which increases costs, instead preferring cheaper solutions, like block devices. pstore/blk provides separate configurations for the end user and for the block drivers. User configuration determines how pstore/blk operates, such as record sizes, max kmsg dump reasons, etc. These can be set by Kconfig and/or module parameters, but module parameter have priority over Kconfig. Driver configuration covers all the details about the target block device, such as total size of the device and how to perform read/write operations. These are provided by block drivers, calling pstore_register_blkdev(), including an optional panic_write callback used to bypass regular IO APIs in an effort to avoid potentially destabilized kernel code during a panic. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-3-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:57 +08:00
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.
Documentation: Add details for pstore/blk 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>
2020-03-25 16:55:02 +08:00
For more information, see Documentation/admin-guide/pstore-blk.rst
pstore/blk: Introduce backend for block devices pstore/blk is similar to pstore/ram, but uses a block device as the storage rather than persistent ram. The pstore/blk backend solves two common use-cases that used to preclude using pstore/ram: - not all devices have a battery that could be used to persist regular RAM across power failures. - most embedded intelligent equipment have no persistent ram, which increases costs, instead preferring cheaper solutions, like block devices. pstore/blk provides separate configurations for the end user and for the block drivers. User configuration determines how pstore/blk operates, such as record sizes, max kmsg dump reasons, etc. These can be set by Kconfig and/or module parameters, but module parameter have priority over Kconfig. Driver configuration covers all the details about the target block device, such as total size of the device and how to perform read/write operations. These are provided by block drivers, calling pstore_register_blkdev(), including an optional panic_write callback used to bypass regular IO APIs in an effort to avoid potentially destabilized kernel code during a panic. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-3-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:57 +08:00
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.
pstore/zone,blk: Add console frontend support Support backend for console. To enable console backend, just make console_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-5-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:55:00 +08:00
It accepts the following variants:
pstore/blk: Introduce backend for block devices pstore/blk is similar to pstore/ram, but uses a block device as the storage rather than persistent ram. The pstore/blk backend solves two common use-cases that used to preclude using pstore/ram: - not all devices have a battery that could be used to persist regular RAM across power failures. - most embedded intelligent equipment have no persistent ram, which increases costs, instead preferring cheaper solutions, like block devices. pstore/blk provides separate configurations for the end user and for the block drivers. User configuration determines how pstore/blk operates, such as record sizes, max kmsg dump reasons, etc. These can be set by Kconfig and/or module parameters, but module parameter have priority over Kconfig. Driver configuration covers all the details about the target block device, such as total size of the device and how to perform read/write operations. These are provided by block drivers, calling pstore_register_blkdev(), including an optional panic_write callback used to bypass regular IO APIs in an effort to avoid potentially destabilized kernel code during a panic. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-3-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:57 +08:00
1) <hex_major><hex_minor> device number in hexadecimal representation,
with no leading 0x, for example b302.
pstore/zone,blk: Add console frontend support Support backend for console. To enable console backend, just make console_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-5-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:55:00 +08:00
2) /dev/<disk_name> represents the device name of disk
3) /dev/<disk_name><decimal> represents the device name and number
pstore/blk: Introduce backend for block devices pstore/blk is similar to pstore/ram, but uses a block device as the storage rather than persistent ram. The pstore/blk backend solves two common use-cases that used to preclude using pstore/ram: - not all devices have a battery that could be used to persist regular RAM across power failures. - most embedded intelligent equipment have no persistent ram, which increases costs, instead preferring cheaper solutions, like block devices. pstore/blk provides separate configurations for the end user and for the block drivers. User configuration determines how pstore/blk operates, such as record sizes, max kmsg dump reasons, etc. These can be set by Kconfig and/or module parameters, but module parameter have priority over Kconfig. Driver configuration covers all the details about the target block device, such as total size of the device and how to perform read/write operations. These are provided by block drivers, calling pstore_register_blkdev(), including an optional panic_write callback used to bypass regular IO APIs in an effort to avoid potentially destabilized kernel code during a panic. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-3-keescook@chromium.org/ Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:57 +08:00
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.
pstore/zone,blk: Add support for pmsg frontend Add pmsg support to pstore/blk (through pstore/zone). To enable, pmsg_size must be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-4-keescook@chromium.org/ Co-developed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/lkml/20200512171932.222102-1-colin.king@canonical.com Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:54:59 +08:00
config PSTORE_BLK_PMSG_SIZE
int "Size in Kbytes of pmsg to store"
depends on PSTORE_BLK
depends on PSTORE_PMSG
default 64
help
This just sets size of pmsg (pmsg_size) 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.
pstore/zone,blk: Add console frontend support Support backend for console. To enable console backend, just make console_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-5-keescook@chromium.org/ Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:55:00 +08:00
config PSTORE_BLK_CONSOLE_SIZE
int "Size in Kbytes of console log to store"
depends on PSTORE_BLK
depends on PSTORE_CONSOLE
default 64
help
This just sets size of console log (console_size) to store via
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.
pstore/zone,blk: Add ftrace frontend support Support backend for ftrace. To enable ftrace backend, just make ftrace_size be greater than 0 and a multiple of 4096. Signed-off-by: WeiXiong Liao <liaoweixiong@allwinnertech.com> Link: https://lore.kernel.org/lkml/20200511233229.27745-6-keescook@chromium.org/ Co-developed-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Colin Ian King <colin.king@canonical.com> Link: https://lore.kernel.org/lkml/20200512170719.221514-1-colin.king@canonical.com Signed-off-by: Kees Cook <keescook@chromium.org>
2020-03-25 16:55:01 +08:00
config PSTORE_BLK_FTRACE_SIZE
int "Size in Kbytes of ftrace log to store"
depends on PSTORE_BLK
depends on PSTORE_FTRACE
default 64
help
This just sets size of ftrace log (ftrace_size) 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.
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