On Fri, May 15, 2020 at 12:44 PM Kees Cook <keescook@xxxxxxxxxxxx> wrote: > > From: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> Subject still has 'max_reason'. > > Currently, it is possible to dump kmsges for panic, or oops. > With max_reason it is possible to dump messages for other And here. > kmesg_dump events, for example reboot, halt, shutdown, kexec. > > Signed-off-by: Pavel Tatashin <pasha.tatashin@xxxxxxxxxx> > Link: https://lore.kernel.org/lkml/20200506211523.15077-6-keescook@xxxxxxxxxxxx/ > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > .../devicetree/bindings/reserved-memory/ramoops.txt | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > > diff --git a/Documentation/devicetree/bindings/reserved-memory/ramoops.txt b/Documentation/devicetree/bindings/reserved-memory/ramoops.txt > index 0eba562fe5c6..b7886fea368c 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 +45,16 @@ 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 And here (3 times). > + (KMSG_DUMP_PANIC). > > - flags: if present, pass ramoops behavioral flags (defaults to 0, > see include/linux/pstore_ram.h RAMOOPS_FLAG_* for flag values). > -- > 2.20.1 >
