1# SPDX-License-Identifier: GPL-2.0-only 2config PSTORE 3 tristate "Persistent store support" 4 select CRYPTO if PSTORE_COMPRESS 5 default n 6 help 7 This option enables generic access to platform level 8 persistent storage via "pstore" filesystem that can 9 be mounted as /dev/pstore. Only useful if you have 10 a platform level driver that registers with pstore to 11 provide the data, so you probably should just go say "Y" 12 (or "M") to a platform specific persistent store driver 13 (e.g. ACPI_APEI on X86) which will select this for you. 14 If you don't have a platform persistent store driver, 15 say N. 16 17config PSTORE_DEFLATE_COMPRESS 18 tristate "DEFLATE (ZLIB) compression" 19 default y 20 depends on PSTORE 21 select CRYPTO_DEFLATE 22 help 23 This option enables DEFLATE (also known as ZLIB) compression 24 algorithm support. 25 26config PSTORE_LZO_COMPRESS 27 tristate "LZO compression" 28 depends on PSTORE 29 select CRYPTO_LZO 30 help 31 This option enables LZO compression algorithm support. 32 33config PSTORE_LZ4_COMPRESS 34 tristate "LZ4 compression" 35 depends on PSTORE 36 select CRYPTO_LZ4 37 help 38 This option enables LZ4 compression algorithm support. 39 40config PSTORE_LZ4HC_COMPRESS 41 tristate "LZ4HC compression" 42 depends on PSTORE 43 select CRYPTO_LZ4HC 44 help 45 This option enables LZ4HC (high compression) mode algorithm. 46 47config PSTORE_842_COMPRESS 48 bool "842 compression" 49 depends on PSTORE 50 select CRYPTO_842 51 help 52 This option enables 842 compression algorithm support. 53 54config PSTORE_ZSTD_COMPRESS 55 bool "zstd compression" 56 depends on PSTORE 57 select CRYPTO_ZSTD 58 help 59 This option enables zstd compression algorithm support. 60 61config PSTORE_COMPRESS 62 def_bool y 63 depends on PSTORE 64 depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \ 65 PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \ 66 PSTORE_842_COMPRESS || PSTORE_ZSTD_COMPRESS 67 68choice 69 prompt "Default pstore compression algorithm" 70 depends on PSTORE_COMPRESS 71 help 72 This option chooses the default active compression algorithm. 73 This change be changed at boot with "pstore.compress=..." on 74 the kernel command line. 75 76 Currently, pstore has support for 6 compression algorithms: 77 deflate, lzo, lz4, lz4hc, 842 and zstd. 78 79 The default compression algorithm is deflate. 80 81 config PSTORE_DEFLATE_COMPRESS_DEFAULT 82 bool "deflate" if PSTORE_DEFLATE_COMPRESS 83 84 config PSTORE_LZO_COMPRESS_DEFAULT 85 bool "lzo" if PSTORE_LZO_COMPRESS 86 87 config PSTORE_LZ4_COMPRESS_DEFAULT 88 bool "lz4" if PSTORE_LZ4_COMPRESS 89 90 config PSTORE_LZ4HC_COMPRESS_DEFAULT 91 bool "lz4hc" if PSTORE_LZ4HC_COMPRESS 92 93 config PSTORE_842_COMPRESS_DEFAULT 94 bool "842" if PSTORE_842_COMPRESS 95 96 config PSTORE_ZSTD_COMPRESS_DEFAULT 97 bool "zstd" if PSTORE_ZSTD_COMPRESS 98 99endchoice 100 101config PSTORE_COMPRESS_DEFAULT 102 string 103 depends on PSTORE_COMPRESS 104 default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT 105 default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT 106 default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT 107 default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT 108 default "842" if PSTORE_842_COMPRESS_DEFAULT 109 default "zstd" if PSTORE_ZSTD_COMPRESS_DEFAULT 110 111config PSTORE_CONSOLE 112 bool "Log kernel console messages" 113 depends on PSTORE 114 help 115 When the option is enabled, pstore will log all kernel 116 messages, even if no oops or panic happened. 117 118config PSTORE_PMSG 119 bool "Log user space messages" 120 depends on PSTORE 121 help 122 When the option is enabled, pstore will export a character 123 interface /dev/pmsg0 to log user space messages. On reboot 124 data can be retrieved from /sys/fs/pstore/pmsg-ramoops-[ID]. 125 126 If unsure, say N. 127 128config PSTORE_FTRACE 129 bool "Persistent function tracer" 130 depends on PSTORE 131 depends on FUNCTION_TRACER 132 depends on DEBUG_FS 133 help 134 With this option kernel traces function calls into a persistent 135 ram buffer that can be decoded and dumped after reboot through 136 pstore filesystem. It can be used to determine what function 137 was last called before a reset or panic. 138 139 If unsure, say N. 140 141config PSTORE_RAM 142 tristate "Log panic/oops to a RAM buffer" 143 depends on PSTORE 144 depends on HAS_IOMEM 145 select REED_SOLOMON 146 select REED_SOLOMON_ENC8 147 select REED_SOLOMON_DEC8 148 help 149 This enables panic and oops messages to be logged to a circular 150 buffer in RAM where it can be read back at some later point. 151 152 Note that for historical reasons, the module will be named 153 "ramoops.ko". 154 155 For more information, see Documentation/admin-guide/ramoops.rst. 156 157config PSTORE_ZONE 158 tristate 159 depends on PSTORE 160 help 161 The common layer for pstore/blk (and pstore/ram in the future) 162 to manage storage in zones. 163 164config PSTORE_BLK 165 tristate "Log panic/oops to a block device" 166 depends on PSTORE 167 depends on BLOCK 168 select PSTORE_ZONE 169 default n 170 help 171 This enables panic and oops message to be logged to a block dev 172 where it can be read back at some later point. 173 174 For more information, see Documentation/admin-guide/pstore-blk.rst 175 176 If unsure, say N. 177 178config PSTORE_BLK_BLKDEV 179 string "block device identifier" 180 depends on PSTORE_BLK 181 default "" 182 help 183 Which block device should be used for pstore/blk. 184 185 It accepts the following variants: 186 1) <hex_major><hex_minor> device number in hexadecimal representation, 187 with no leading 0x, for example b302. 188 2) /dev/<disk_name> represents the device name of disk 189 3) /dev/<disk_name><decimal> represents the device name and number 190 of partition - device number of disk plus the partition number 191 4) /dev/<disk_name>p<decimal> - same as the above, this form is 192 used when disk name of partitioned disk ends with a digit. 193 5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 194 unique id of a partition if the partition table provides it. 195 The UUID may be either an EFI/GPT UUID, or refer to an MSDOS 196 partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- 197 filled hex representation of the 32-bit "NT disk signature", and PP 198 is a zero-filled hex representation of the 1-based partition number. 199 6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation 200 to a partition with a known unique id. 201 7) <major>:<minor> major and minor number of the device separated by 202 a colon. 203 204 NOTE that, both Kconfig and module parameters can configure 205 pstore/blk, but module parameters have priority over Kconfig. 206 207config PSTORE_BLK_KMSG_SIZE 208 int "Size in Kbytes of kmsg dump log to store" 209 depends on PSTORE_BLK 210 default 64 211 help 212 This just sets size of kmsg dump (oops, panic, etc) log for 213 pstore/blk. The size is in KB and must be a multiple of 4. 214 215 NOTE that, both Kconfig and module parameters can configure 216 pstore/blk, but module parameters have priority over Kconfig. 217 218config PSTORE_BLK_MAX_REASON 219 int "Maximum kmsg dump reason to store" 220 depends on PSTORE_BLK 221 default 2 222 help 223 The maximum reason for kmsg dumps to store. The default is 224 2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's 225 enum kmsg_dump_reason for more details. 226 227 NOTE that, both Kconfig and module parameters can configure 228 pstore/blk, but module parameters have priority over Kconfig. 229 230config PSTORE_BLK_PMSG_SIZE 231 int "Size in Kbytes of pmsg to store" 232 depends on PSTORE_BLK 233 depends on PSTORE_PMSG 234 default 64 235 help 236 This just sets size of pmsg (pmsg_size) for pstore/blk. The size is 237 in KB and must be a multiple of 4. 238 239 NOTE that, both Kconfig and module parameters can configure 240 pstore/blk, but module parameters have priority over Kconfig. 241 242config PSTORE_BLK_CONSOLE_SIZE 243 int "Size in Kbytes of console log to store" 244 depends on PSTORE_BLK 245 depends on PSTORE_CONSOLE 246 default 64 247 help 248 This just sets size of console log (console_size) to store via 249 pstore/blk. The size is in KB and must be a multiple of 4. 250 251 NOTE that, both Kconfig and module parameters can configure 252 pstore/blk, but module parameters have priority over Kconfig. 253 254config PSTORE_BLK_FTRACE_SIZE 255 int "Size in Kbytes of ftrace log to store" 256 depends on PSTORE_BLK 257 depends on PSTORE_FTRACE 258 default 64 259 help 260 This just sets size of ftrace log (ftrace_size) for pstore/blk. The 261 size is in KB and must be a multiple of 4. 262 263 NOTE that, both Kconfig and module parameters can configure 264 pstore/blk, but module parameters have priority over Kconfig. 265