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TOMOYO Linux Cross Reference
Linux/fs/pstore/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0-only
  2 config PSTORE
  3         tristate "Persistent store support"
  4         default n
  5         help
  6            This option enables generic access to platform level
  7            persistent storage via "pstore" filesystem that can
  8            be mounted as /dev/pstore.  Only useful if you have
  9            a platform level driver that registers with pstore to
 10            provide the data, so you probably should just go say "Y"
 11            (or "M") to a platform specific persistent store driver
 12            (e.g. ACPI_APEI on X86) which will select this for you.
 13            If you don't have a platform persistent store driver,
 14            say N.
 15 
 16 config PSTORE_DEFAULT_KMSG_BYTES
 17         int "Default kernel log storage space" if EXPERT
 18         depends on PSTORE
 19         default "10240"
 20         help
 21           Defines default size of pstore kernel log storage.
 22           Can be enlarged if needed, not recommended to shrink it.
 23 
 24 config PSTORE_COMPRESS
 25         bool "Pstore compression (deflate)"
 26         depends on PSTORE
 27         select ZLIB_INFLATE
 28         select ZLIB_DEFLATE
 29         default y
 30         help
 31           Whether pstore records should be compressed before being written to
 32           the backing store. This is implemented using the zlib 'deflate'
 33           algorithm, using the library implementation instead of using the full
 34           blown crypto API. This reduces the risk of secondary oopses or other
 35           problems while pstore is recording panic metadata.
 36 
 37 config PSTORE_CONSOLE
 38         bool "Log kernel console messages"
 39         depends on PSTORE
 40         help
 41           When the option is enabled, pstore will log all kernel
 42           messages, even if no oops or panic happened.
 43 
 44 config PSTORE_PMSG
 45         bool "Log user space messages"
 46         depends on PSTORE
 47         select RT_MUTEXES
 48         help
 49           When the option is enabled, pstore will export a character
 50           interface /dev/pmsg0 to log user space messages. On reboot
 51           data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID].
 52 
 53           If unsure, say N.
 54 
 55 config PSTORE_FTRACE
 56         bool "Persistent function tracer"
 57         depends on PSTORE
 58         depends on FUNCTION_TRACER
 59         depends on DEBUG_FS
 60         help
 61           With this option kernel traces function calls into a persistent
 62           ram buffer that can be decoded and dumped after reboot through
 63           pstore filesystem. It can be used to determine what function
 64           was last called before a reset or panic.
 65 
 66           If unsure, say N.
 67 
 68 config PSTORE_RAM
 69         tristate "Log panic/oops to a RAM buffer"
 70         depends on PSTORE
 71         depends on HAS_IOMEM
 72         select REED_SOLOMON
 73         select REED_SOLOMON_ENC8
 74         select REED_SOLOMON_DEC8
 75         help
 76           This enables panic and oops messages to be logged to a circular
 77           buffer in RAM where it can be read back at some later point.
 78 
 79           Note that for historical reasons, the module will be named
 80           "ramoops.ko".
 81 
 82           For more information, see Documentation/admin-guide/ramoops.rst.
 83 
 84 config PSTORE_ZONE
 85         tristate
 86         depends on PSTORE
 87         help
 88           The common layer for pstore/blk (and pstore/ram in the future)
 89           to manage storage in zones.
 90 
 91 config PSTORE_BLK
 92         tristate "Log panic/oops to a block device"
 93         depends on PSTORE
 94         depends on BLOCK
 95         select PSTORE_ZONE
 96         default n
 97         help
 98           This enables panic and oops message to be logged to a block dev
 99           where it can be read back at some later point.
100 
101           For more information, see Documentation/admin-guide/pstore-blk.rst
102 
103           If unsure, say N.
104 
105 config PSTORE_BLK_BLKDEV
106         string "block device identifier"
107         depends on PSTORE_BLK
108         default ""
109         help
110           Which block device should be used for pstore/blk.
111 
112           It accepts the following variants:
113           1) <hex_major><hex_minor> device number in hexadecimal representation,
114              with no leading 0x, for example b302.
115           2) /dev/<disk_name> represents the device name of disk
116           3) /dev/<disk_name><decimal> represents the device name and number
117              of partition - device number of disk plus the partition number
118           4) /dev/<disk_name>p<decimal> - same as the above, this form is
119              used when disk name of partitioned disk ends with a digit.
120           5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the
121              unique id of a partition if the partition table provides it.
122              The UUID may be either an EFI/GPT UUID, or refer to an MSDOS
123              partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero-
124              filled hex representation of the 32-bit "NT disk signature", and PP
125              is a zero-filled hex representation of the 1-based partition number.
126           6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation
127              to a partition with a known unique id.
128           7) <major>:<minor> major and minor number of the device separated by
129              a colon.
130 
131           NOTE that, both Kconfig and module parameters can configure
132           pstore/blk, but module parameters have priority over Kconfig.
133 
134 config PSTORE_BLK_KMSG_SIZE
135         int "Size in Kbytes of kmsg dump log to store"
136         depends on PSTORE_BLK
137         default 64
138         help
139           This just sets size of kmsg dump (oops, panic, etc) log for
140           pstore/blk. The size is in KB and must be a multiple of 4.
141 
142           NOTE that, both Kconfig and module parameters can configure
143           pstore/blk, but module parameters have priority over Kconfig.
144 
145 config PSTORE_BLK_MAX_REASON
146         int "Maximum kmsg dump reason to store"
147         depends on PSTORE_BLK
148         default 2
149         help
150           The maximum reason for kmsg dumps to store. The default is
151           2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's
152           enum kmsg_dump_reason for more details.
153 
154           NOTE that, both Kconfig and module parameters can configure
155           pstore/blk, but module parameters have priority over Kconfig.
156 
157 config PSTORE_BLK_PMSG_SIZE
158         int "Size in Kbytes of pmsg to store"
159         depends on PSTORE_BLK
160         depends on PSTORE_PMSG
161         default 64
162         help
163           This just sets size of pmsg (pmsg_size) for pstore/blk. The size is
164           in KB and must be a multiple of 4.
165 
166           NOTE that, both Kconfig and module parameters can configure
167           pstore/blk, but module parameters have priority over Kconfig.
168 
169 config PSTORE_BLK_CONSOLE_SIZE
170         int "Size in Kbytes of console log to store"
171         depends on PSTORE_BLK
172         depends on PSTORE_CONSOLE
173         default 64
174         help
175           This just sets size of console log (console_size) to store via
176           pstore/blk. The size is in KB and must be a multiple of 4.
177 
178           NOTE that, both Kconfig and module parameters can configure
179           pstore/blk, but module parameters have priority over Kconfig.
180 
181 config PSTORE_BLK_FTRACE_SIZE
182         int "Size in Kbytes of ftrace log to store"
183         depends on PSTORE_BLK
184         depends on PSTORE_FTRACE
185         default 64
186         help
187           This just sets size of ftrace log (ftrace_size) for pstore/blk. The
188           size is in KB and must be a multiple of 4.
189 
190           NOTE that, both Kconfig and module parameters can configure
191           pstore/blk, but module parameters have priority over Kconfig.

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