On Mon, May 18, 2020 at 04:45:32PM -0600, Rob Herring wrote: > 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. Ah yeah, this was, I think, describing the internal field name, but I see it would be less confusing to refer to this by the DT name. I will adjust it. Thanks! -Kees > > > 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 > > -- Kees Cook
