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ramoops: Add "max-reason" optional field to ramoops DT node

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Currently, it is only possible to get kmsg dumps for panic and oops,
or just panic, via "no-dump-oops". With "max-reason" it is possible to
dump messages for other kmsg_dump events, for example emerg and shutdown.

Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
Link: https://lore.kernel.org/lkml/20200515184434.8470-7-keescook@chromium.org/
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Pavel Tatashin 2020-05-05 11:45:10 -04:00 committed by Kees Cook
parent 791205e3ec
commit acf12c5e58
1 changed files with 11 additions and 2 deletions
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13
Documentation/devicetree/bindings/reserved-memory/ramoops.txt
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@ -30,7 +30,7 @@ Optional properties:
- ecc-size: enables ECC support and specifies ECC buffer size in bytes
(defaults to 0: no ECC)
- record-size: maximum size in bytes of each dump done on oops/panic
- record-size: maximum size in bytes of each kmsg dump.
(defaults to 0: disabled)
- console-size: size in bytes of log buffer reserved for kernel messages
@ -45,7 +45,16 @@ Optional properties:
- unbuffered: if present, use unbuffered mappings to map the reserved region
(defaults to buffered mappings)
- no-dump-oops: if present, only dump panics (defaults to panics and oops)
- max-reason: if present, sets maximum type of kmsg dump reasons to store
(defaults to 2: log Oopses and Panics). This can be set to INT_MAX to
store all kmsg dumps. See include/linux/kmsg_dump.h KMSG_DUMP_* for other
kmsg dump reason values. Setting this to 0 (KMSG_DUMP_UNDEF), means the
reason filtering will be controlled by the printk.always_kmsg_dump boot
param: if unset, it will be KMSG_DUMP_OOPS, otherwise KMSG_DUMP_MAX.
- no-dump-oops: deprecated, use max_reason instead. If present, and
max_reason is not specified, it is equivalent to max_reason = 1
(KMSG_DUMP_PANIC).
- flags: if present, pass ramoops behavioral flags (defaults to 0,
see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values).