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_BLACKBOX 142 bool "Store customised fault log" 143 depends on PSTORE 144 depends on BLACKBOX 145 help 146 Enable storing the customised fault log for BlackBox. 147 148 With the option enabled, pstore will store the customised kernel 149 fault log for BlackBox when oops or panic happened. 150 151 If unsure, say N. 152 153config PSTORE_RAM 154 tristate "Log panic/oops to a RAM buffer" 155 depends on PSTORE 156 depends on HAS_IOMEM 157 select REED_SOLOMON 158 select REED_SOLOMON_ENC8 159 select REED_SOLOMON_DEC8 160 help 161 This enables panic and oops messages to be logged to a circular 162 buffer in RAM where it can be read back at some later point. 163 164 Note that for historical reasons, the module will be named 165 "ramoops.ko". 166 167 For more information, see Documentation/admin-guide/ramoops.rst. 168 169config PSTORE_ZONE 170 tristate 171 depends on PSTORE 172 help 173 The common layer for pstore/blk (and pstore/ram in the future) 174 to manage storage in zones. 175 176config PSTORE_BLK 177 tristate "Log panic/oops to a block device" 178 depends on PSTORE 179 depends on BLOCK 180 depends on BLACKBOX_USE_PSTORE_BLK_DEBUG || BROKEN 181 select PSTORE_ZONE 182 default n 183 help 184 This enables panic and oops message to be logged to a block dev 185 where it can be read back at some later point. 186 187 For more information, see Documentation/admin-guide/pstore-blk.rst 188 189 If unsure, say N. 190 191config PSTORE_BLK_BLKDEV 192 string "block device identifier" 193 depends on PSTORE_BLK 194 default "" 195 help 196 Which block device should be used for pstore/blk. 197 198 It accepts the following variants: 199 1) <hex_major><hex_minor> device number in hexadecimal representation, 200 with no leading 0x, for example b302. 201 2) /dev/<disk_name> represents the device name of disk 202 3) /dev/<disk_name><decimal> represents the device name and number 203 of partition - device number of disk plus the partition number 204 4) /dev/<disk_name>p<decimal> - same as the above, this form is 205 used when disk name of partitioned disk ends with a digit. 206 5) PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF representing the 207 unique id of a partition if the partition table provides it. 208 The UUID may be either an EFI/GPT UUID, or refer to an MSDOS 209 partition using the format SSSSSSSS-PP, where SSSSSSSS is a zero- 210 filled hex representation of the 32-bit "NT disk signature", and PP 211 is a zero-filled hex representation of the 1-based partition number. 212 6) PARTUUID=<UUID>/PARTNROFF=<int> to select a partition in relation 213 to a partition with a known unique id. 214 7) <major>:<minor> major and minor number of the device separated by 215 a colon. 216 217 NOTE that, both Kconfig and module parameters can configure 218 pstore/blk, but module parameters have priority over Kconfig. 219 220config PSTORE_BLK_KMSG_SIZE 221 int "Size in Kbytes of kmsg dump log to store" 222 depends on PSTORE_BLK 223 default 64 224 help 225 This just sets size of kmsg dump (oops, panic, etc) log for 226 pstore/blk. The size is in KB and must be a multiple of 4. 227 228 NOTE that, both Kconfig and module parameters can configure 229 pstore/blk, but module parameters have priority over Kconfig. 230 231config PSTORE_BLK_MAX_REASON 232 int "Maximum kmsg dump reason to store" 233 depends on PSTORE_BLK 234 default 2 235 help 236 The maximum reason for kmsg dumps to store. The default is 237 2 (KMSG_DUMP_OOPS), see include/linux/kmsg_dump.h's 238 enum kmsg_dump_reason for more details. 239 240 NOTE that, both Kconfig and module parameters can configure 241 pstore/blk, but module parameters have priority over Kconfig. 242 243config PSTORE_BLK_PMSG_SIZE 244 int "Size in Kbytes of pmsg to store" 245 depends on PSTORE_BLK 246 depends on PSTORE_PMSG 247 default 64 248 help 249 This just sets size of pmsg (pmsg_size) for pstore/blk. The size is 250 in KB and must be a multiple of 4. 251 252 NOTE that, both Kconfig and module parameters can configure 253 pstore/blk, but module parameters have priority over Kconfig. 254 255config PSTORE_BLK_CONSOLE_SIZE 256 int "Size in Kbytes of console log to store" 257 depends on PSTORE_BLK 258 depends on PSTORE_CONSOLE 259 default 64 260 help 261 This just sets size of console log (console_size) to store via 262 pstore/blk. The size is in KB and must be a multiple of 4. 263 264 NOTE that, both Kconfig and module parameters can configure 265 pstore/blk, but module parameters have priority over Kconfig. 266 267config PSTORE_BLK_FTRACE_SIZE 268 int "Size in Kbytes of ftrace log to store" 269 depends on PSTORE_BLK 270 depends on PSTORE_FTRACE 271 default 64 272 help 273 This just sets size of ftrace log (ftrace_size) for pstore/blk. The 274 size is in KB and must be a multiple of 4. 275 276 NOTE that, both Kconfig and module parameters can configure 277 pstore/blk, but module parameters have priority over Kconfig. 278 279config PSTORE_BLK_BLACKBOX_SIZE 280 int "Size in Kbytes of fault log for BlackBox to store" 281 depends on PSTORE_BLK 282 depends on PSTORE_BLACKBOX 283 default 64 284 help 285 This just sets size of fault log (blackbox_size) for pstore/blk. 286 The size is in KB and must be a multiple of 4. 287 288 NOTE that, both Kconfig and module parameters can configure 289 pstore/blk, but module parameters have priority over Kconfig. 290 291config PSTORE_BLACKBOX_STACK_SIZE 292 int "Default stack size for BlackBox" if EXPERT 293 depends on PSTORE 294 depends on PSTORE_BLACKBOX 295 default 1024 296 help 297 Defines default size of pstore stack size for blackbox. 298 Can be enlarged if needed. not recommended to shrink it. 299