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
7 persistent storage via "pstore" fil
8 be mounted as /dev/pstore. Only us
9 a platform level driver that regist
10 provide the data, so you probably s
11 (or "M") to a platform specific per
12 (e.g. ACPI_APEI on X86) which will
13 If you don't have a platform persis
14 say N.
15
16 config PSTORE_DEFAULT_KMSG_BYTES
17 int "Default kernel log storage space"
18 depends on PSTORE
19 default "10240"
20 help
21 Defines default size of pstore kerne
22 Can be enlarged if needed, not recom
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 com
32 the backing store. This is implement
33 algorithm, using the library impleme
34 blown crypto API. This reduces the r
35 problems while pstore is recording p
36
37 config PSTORE_CONSOLE
38 bool "Log kernel console messages"
39 depends on PSTORE
40 help
41 When the option is enabled, pstore w
42 messages, even if no oops or panic h
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 w
50 interface /dev/pmsg0 to log user spa
51 data can be retrieved from /sys/fs/p
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 funct
62 ram buffer that can be decoded and d
63 pstore filesystem. It can be used to
64 was last called before a reset or pa
65
66 If unsure, say N.
67
68 config PSTORE_RAM
69 tristate "Log panic/oops to a RAM buff
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
77 buffer in RAM where it can be read b
78
79 Note that for historical reasons, th
80 "ramoops.ko".
81
82 For more information, see Documentat
83
84 config PSTORE_ZONE
85 tristate
86 depends on PSTORE
87 help
88 The common layer for pstore/blk (and
89 to manage storage in zones.
90
91 config PSTORE_BLK
92 tristate "Log panic/oops to a block de
93 depends on PSTORE
94 depends on BLOCK
95 select PSTORE_ZONE
96 default n
97 help
98 This enables panic and oops message
99 where it can be read back at some la
100
101 For more information, see Documentat
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 fo
111
112 It accepts the following variants:
113 1) <hex_major><hex_minor> device num
114 with no leading 0x, for example b
115 2) /dev/<disk_name> represents the d
116 3) /dev/<disk_name><decimal> represe
117 of partition - device number of d
118 4) /dev/<disk_name>p<decimal> - same
119 used when disk name of partitione
120 5) PARTUUID=00112233-4455-6677-8899-
121 unique id of a partition if the p
122 The UUID may be either an EFI/GPT
123 partition using the format SSSSSS
124 filled hex representation of the
125 is a zero-filled hex representati
126 6) PARTUUID=<UUID>/PARTNROFF=<int> t
127 to a partition with a known uniqu
128 7) <major>:<minor> major and minor n
129 a colon.
130
131 NOTE that, both Kconfig and module p
132 pstore/blk, but module parameters ha
133
134 config PSTORE_BLK_KMSG_SIZE
135 int "Size in Kbytes of kmsg dump log t
136 depends on PSTORE_BLK
137 default 64
138 help
139 This just sets size of kmsg dump (oo
140 pstore/blk. The size is in KB and mu
141
142 NOTE that, both Kconfig and module p
143 pstore/blk, but module parameters ha
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
151 2 (KMSG_DUMP_OOPS), see include/linu
152 enum kmsg_dump_reason for more detai
153
154 NOTE that, both Kconfig and module p
155 pstore/blk, but module parameters ha
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_si
164 in KB and must be a multiple of 4.
165
166 NOTE that, both Kconfig and module p
167 pstore/blk, but module parameters ha
168
169 config PSTORE_BLK_CONSOLE_SIZE
170 int "Size in Kbytes of console log to
171 depends on PSTORE_BLK
172 depends on PSTORE_CONSOLE
173 default 64
174 help
175 This just sets size of console log (
176 pstore/blk. The size is in KB and mu
177
178 NOTE that, both Kconfig and module p
179 pstore/blk, but module parameters ha
180
181 config PSTORE_BLK_FTRACE_SIZE
182 int "Size in Kbytes of ftrace log to s
183 depends on PSTORE_BLK
184 depends on PSTORE_FTRACE
185 default 64
186 help
187 This just sets size of ftrace log (f
188 size is in KB and must be a multiple
189
190 NOTE that, both Kconfig and module p
191 pstore/blk, but module parameters ha
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