[PATCH v2 5/5] ramoops: add max_reason optional field to ramoops DT node

From: Pavel Tatashin
Date: Tue May 05 2020 - 11:45:31 EST


Currently, it is possible to dump kmsges for panic, or oops.
With max_reason it is possible to dump messages for other
kmesg_dump events, for example reboot, halt, shutdown, kexec.

Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx>
---
.../devicetree/bindings/reserved-memory/ramoops.txt | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/reserved-memory/ramoops.txt b/Documentation/devicetree/bindings/reserved-memory/ramoops.txt
index 0eba562fe5c6..886cff15d822 100644
--- a/Documentation/devicetree/bindings/reserved-memory/ramoops.txt
+++ b/Documentation/devicetree/bindings/reserved-memory/ramoops.txt
@@ -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 +45,13 @@ 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: maximum reason for kmsg dump. Defaults to 2 (dump oops and
+ panics). Can be set to INT_MAX to dump for all reasons. See
+ include/linux/kmsg_dump.h KMSG_DUMP_* for other kmsg dump values.
+
+- no-dump-oops: deprecated, use max_reason instead.
+ if present, and max_reason is not specified 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).
--
2.25.1